SCHEDULE 14A INFORMATION

                  Proxy Statement Pursuant to Section 14(a) of
                      the Securities Exchange Act of 1934
                                (Amendment no. 1)


Filed by the Registrant    [X]
Filed by a party other than the Registrant   [ ]

Check the appropriate box:
[ ] Preliminary Proxy Statement [ ] Confidential,  for Use of the [X] Definitive
Proxy  Statement  Commission  Only (as  permitted by [ ]  Definitive  Additional
Materials Rule 14a-6(e)(2)) [ ] Soliciting Material Pursuant to
     Rule 14a-11(c) or Rule 14a-12

                            INTEGRATED SYSTEMS, INC.
            ------------------------------------------------
            (Name of Registrant as Specified in Its Charter)


  ------------------------------------------------------------------------
  (Name of Person(s) Filing Proxy Statement, if other than the Registrant)


Payment of filing fee (Check the appropriate box):

[X]  No fee required.
[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.


(1) Title of each class of securities to which transactions applies:

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(2) Aggregate number of securities to which transactions applies:

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(3)   Per unit price or other underlying value of transaction  computed pursuant
      to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is
      calculated and state how it was determined):

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(4) Proposed maximum aggregate value of transaction:

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(5) Total fee paid:

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[ ]   Fee paid previously with preliminary materials.
- --------------------------------------------------------------------------------

[     ] Check box if any part of the fee is offset as provided  by Exchange  Act
      Rule  0-11(a)(2)  and identify the filing for which the offsetting fee was
      paid  previously.  Identify the previous filing by registration  statement
      number, or the Form or Schedule and the date of its filing.

(1)   Amount previously paid:

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(2)   Form, Schedule or Registration Statement No.:

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(4) Date filed:

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                         [INTEGRATED SYSTEMS, INC. Logo]

                            INTEGRATED SYSTEMS, INC.
                             201 Moffett Park Drive
                           Sunnyvale, California 94089


                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS


To Our Shareholders:

         NOTICE IS HEREBY  GIVEN that the  Annual  Meeting  of  Shareholders  of
Integrated  Systems,  Inc.  (the  "Company")  will be held at the  Company,  201
Moffett Park Drive, Sunnyvale,  California,  94089 on July 15, 1998 at 2:00 p.m.
for the following purposes:

         1. To elect  seven  directors  of the  Company to serve  until the next
         Annual Meeting of Shareholders  and until their  respective  successors
         have been  elected  and  qualified  or until  such  directors'  earlier
         resignation or removal.  The Company's Board of Directors has nominated
         the following candidates: Narendra K. Gupta, John C. Bolger, Michael A.
         Brochu,  Vinita Gupta, Thomas Kailath,  Richard C. Murphy, and David P.
         St. Charles.

         2. To approve the adoption of the Company's 1998 Equity Incentive Plan.

         3. To approve an amendment to the 1994  Directors  Stock Option Plan to
         eliminate the provision  which limits the maximum number of shares that
         may be issued to any one director to 40,000 shares.

         4. To ratify the selection of Coopers & Lybrand  L.L.P.  as independent
         accountants for the Company for the current fiscal year.

         5. To  transact  such other  business as may  properly  come before the
         meeting or any adjournments or postponements thereof.

         The foregoing  items of business are more fully  described in the Proxy
Statement accompanying this Notice.

         Only  shareholders  of record at the close of  business on May 21, 1998
are  entitled to notice of and to vote at the meeting  and any  adjournments  or
postponements thereof.


                                              By Order of the Board of Directors

                                              /s/ NARENDRA K. GUPTA
                                              ----------------------------------
                                              Narendra K. Gupta
                                              Chairman of the Board

Sunnyvale, California
June 12, 1998


================================================================================
             WHETHER OR NOT YOU EXPECT TO ATTEND THE MEETING, PLEASE
          COMPLETE, DATE AND SIGN THE ACCOMPANYING PROXY AND RETURN IT
                 PROMPTLY IN THE ENCLOSED POSTAGE-PAID ENVELOPE.
================================================================================






                         [INTEGRATED SYSTEMS, INC. Logo]

                            INTEGRATED SYSTEMS, INC.
                             201 Moffett Park Drive
                           Sunnyvale, California 94089


                                 PROXY STATEMENT


                                  June 12, 1998


         The accompanying proxy is solicited on behalf of the Board of Directors
of Integrated Systems, Inc., a California  corporation (the "Company"),  for use
at the Annual Meeting of  Shareholders of the Company to be held at the Company,
201 Moffett Park Drive,  Sunnyvale,  California,  94089 on July 15, 1998 at 2:00
p.m. (the  "Meeting").  Only holders of record of the Company's  Common Stock at
the close of business  on May 21, 1998 will be entitled to vote at the  Meeting.
At the close of business on that date,  the  Company  had  23,504,566  shares of
Common  Stock  outstanding  and  entitled  to vote.  Shares will be deemed to be
represented at the meeting both where a shareholder  specifically  abstains from
voting and where a broker or other nominee holding shares for beneficial  owners
is able to vote on certain  matters at the  Meeting  pursuant  to  discretionary
authority  or  instruction  from  beneficial  owners  but with  respect to other
matters may not have received instructions from the beneficial owner and may not
exercise voting power ("broker  non-votes").  A majority, or 11,752,284 of these
shares,  represented  in person or by proxy,  will  constitute  a quorum for the
transaction of business.  This Proxy Statement and accompanying proxy will first
be mailed to shareholders on or about June 12, 1998.


             VOTING RIGHTS; SOLICITATION AND REVOCABILITY OF PROXIES

         Holders of Common Stock are entitled to one vote for each share held as
of the above record date.  Any person  signing a proxy in the form  accompanying
this Proxy  Statement  has the power to revoke it prior to the Meeting or at the
Meeting  prior to the vote  pursuant  to the proxy.  A proxy may be revoked by a
writing  delivered  to the  Secretary  of the Company  stating that the proxy is
revoked,  by a  subsequent  proxy  that is signed by the  person  who signed the
earlier  proxy and is presented at the Meeting or by  attendance  at the Meeting
and voting in person.  Please note, however,  that if a shareholder's shares are
held of record by a broker,  bank or other nominee,  and that shareholder wishes
to vote at the Meeting,  the shareholder must bring to the Meeting a letter from
the broker,  bank or other  nominee  confirming  that  shareholder's  beneficial
ownership of the shares.

         The expenses of soliciting  proxies in the form accompanying this Proxy
Statement  will be paid by the Company.  Following  the original  mailing of the
proxies and other  soliciting  materials,  the  Company  will  request  brokers,
custodians, nominees and other record holders to forward copies of the proxy and
other soliciting  materials to persons for whom they hold shares of Common Stock
and to request  authority  for the  exercise  of  proxies.  In such  cases,  the
Company, upon the request of the record holders, will reimburse such holders for
their reasonable expenses.

                                     - 1 -




                     PROPOSAL NO. 1 - ELECTION OF DIRECTORS

         At the Meeting,  shareholders will elect directors to hold office until
the next Annual Meeting of Shareholders  and until their  respective  successors
have been elected and qualified or until such directors' earlier  resignation or
removal. The size of the Company's Board of Directors (the "Board") is currently
set at seven members. Shares represented by the accompanying proxy will be voted
for the election of the seven nominees recommended by the Board unless the proxy
is marked in such a manner as to withhold  authority so to vote.  If any nominee
for any reason is unable to serve or for good cause will not serve,  the proxies
may be voted for such substitute nominee as the proxy holder may determine.  The
Company is not aware of any nominee who will be unable to or for good cause will
not serve as a director.  Directors  are  elected by a  plurality  of the shares
voting, in person or by proxy, at the Meeting.  The seven nominees receiving the
highest number of affirmative  votes of the shares entitled to be voted for them
will be elected. Votes withheld,  abstentions and broker non-votes have no legal
effect.

Directors/Nominees


         The  names  of  the  nominees,   and  certain  information  about  them
(including their respective terms of service), are set forth below:


Director
Name of Nominee                  Age           Principal Occupation                       Since
- ---------------                  ---           --------------------                       -----
                                                                                 
Narendra K. Gupta                49            Chairman of the Board and                  1980
                                                 Secretary of the Company

David P. St. Charles             49            President and Chief Executive Officer      1993
                                                 of the Company

John C. Bolger (1) (2)           51            Retired Chief Financial Officer            1993
                                                 Cisco Systems, Inc.

Michael A. Brochu                44            President  and Chief Executive Officer     1998
                                                 Primus, Inc.

Vinita Gupta                     47            Chairperson of the Board                   1980
                                                 Digital Link Corporation

Thomas Kailath (1)               62            Professor of Engineering,                  1980
                                                 Stanford University

Richard C. Murphy (1) (2)        53            Director                                   1994

<FN>
- ----------------------------------------
(1)      Member of the Compensation Committee.
(2)      Member of the Audit Committee.
</FN>



         All nominees, except Michael A. Brochu, were reelected at the Company's
Annual Meeting of Shareholders held on July 15, 1997.

         Dr.  Gupta is a founder of the  Company  and has been a director of the
Company  since its  formation in 1980.  He has been the Chairman of the Board of
the Company since March 1993 and Secretary  since  September 1989. Dr. Gupta was
Chief  Executive  Officer from 1988 to May 1994 and President from the Company's
formation  in 1980 to May 1994.  He was  elected a Fellow  of the  Institute  of
Electrical and Electronic  Engineers ("IEEE") in November 1991. Dr. Gupta serves
on the board of Digital Link Corporation,  a manufacturer of data communications
equipment.  Dr.  Gupta holds a M.S.  degree  from the  California  Institute  of
Technology  and a Ph.D.  degree from Stanford  University.  He is Vinita Gupta's
husband.

         Mr. St.  Charles  joined the Company in August  1993 and was  appointed
President and Chief Executive  Officer of the Company in May 1994. He has been a
director  since he joined  the  Company  in August  1993.  From April 1990 until
August 1993,  Mr. St.  Charles  served as President and a director of Wind River
Systems,  Inc., a real-time  software  company.  Mr. St. Charles holds a B.A. in
Liberal Arts and a M.A. in International  Economics from Carleton University and
a M.S.  from the Sloan School of Management  at the  Massachusetts  Institute of
Technology.

         Mr.  Bolger  has been a director  of the  Company  since July 1993.  He
served as Vice  President,  Finance and  Administration,  and Secretary of Cisco
Systems,  Inc., a networking systems company,  from 1989 until his retirement in
1992.  Mr. Bolger is also a director of Integrated  Device  Technology,  Inc., a
semiconductor  manufacturer,  TCSI, a communication  software  company,  Sanmina
Corporation,  a backplane and contract assembly  manufacturer,  and Mission West
Properties, a R.E.I.T. He holds a B.A. in English Literature from the University
of Massachusetts and a M.B.A. from Harvard University.

                                     - 2 -




         Mr. Brochu has been a director of the Company  since April 1998.  Since
November  1997,  Mr. Brochu has been  President and Chief  Executive  Officer of
Primus,  Inc.,  a developer  of problem  resolution  software.  Prior to joining
Primus,  Mr. Brochu was President and Chief Operating Officer of Sierra-On-line,
Inc. Mr. Brochu was also appointed  Senior Vice  President of CUC  International
Inc., the parent  corporation  pursuant to their acquisition of  Sierra-On-Line,
Inc.  in July  1996.  From  1982 to 1994,  Mr.  Brochu  held  several  executive
positions at Burlington  Northern Inc., as well as several of its  subsidiaries.
His last position  with  Burlington  Northern  Inc. was that of Chief  Financial
Officer and Senior Vice President of Burlington  Environmental,  Inc. Mr. Brochu
is a  graduate  of the  University  of Texas at El Paso  with  B.S.  degrees  in
Accounting and Finance.

         Mrs.  Gupta has been a director of the Company  since its  formation in
1980.  Since May 1985, she has been Chairperson of Digital Link  Corporation,  a
manufacturer of data  communications  equipment.  In addition,  from May 1985 to
September 1996,  Mrs. Gupta served as President and Chief  Executive  Officer of
Digital  Link  Corporation.  Mrs.  Gupta  holds  a  M.S.  degree  in  Electrical
Engineering from the University of California,  Los Angeles.  She is Narendra K.
Gupta's spouse.

         Dr.  Kailath is a founder of the Company and has been a director of the
Company  since its formation in 1980. He served as Vice Chairman of the Board of
Directors from January 1990 to March 1993 and Chairman of the Board of Directors
from April 1980 to January 1990. He is currently the Hitachi  America  Professor
of  Engineering at Stanford  University,  where he has been on the faculty since
January 1963.  Dr. Kailath is a member of the National  Academy of  Engineering,
the American  Academy of Arts and Sciences and a Fellow of the IEEE. Dr. Kailath
holds M.S. and Sc.D.  degrees in Electrical  Engineering from the  Massachusetts
Institute of Technology.

         Mr. Murphy has been a director of the Company since  December  1994. He
is an  independent  business  consultant.  Mr.  Murphy  is  also a  director  of
Objectivity,  Inc., an object database software  company,  iXOS Software Inc., a
distributor of image management software, Intraspect Software, Inc., an internet
software  company and Intermax  Solutions,  Inc.,  an  applications  development
software  tools  company.  He holds a B.S. in  Mechanical  Engineering  from the
University of Illinois and a M.B.A. from Northwestern University.


            THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR THE ELECTION
                      OF EACH OF THE NOMINEES LISTED ABOVE.


Board of Directors' Meetings and Committees

         The Board met six times and acted by  unanimous  written  consent  once
during the year ended February 28, 1998. All directors attended every meeting of
the Board  and of the  committees  of the Board  either in person or by phone on
which he or she served.

         Standing  committees  of the Board  include  an Audit  Committee  and a
Compensation  Committee.  The Board does not have a  nominating  committee  or a
committee performing a similar function.

         Mr.  Bolger  and Mr.  Murphy  are  currently  the  members of the Audit
Committee.  The Audit  Committee  met three times during  fiscal year 1998.  The
Audit Committee meets with the Company's  independent  accountants to review the
adequacy of the  Company's  internal  control  systems and  financial  reporting
procedures, reviews the general scope of the Company's annual audit and the fees
charged by the independent  accountants and reviews and monitors the performance
of non-audit services by the Company's independent accountants.

         Mr. Bolger, Mr. Murphy and Dr. Kailath are currently the members of the
Company's Compensation Committee. The Compensation Committee met three times and
acted  by  unanimous   written   consent  once  during  fiscal  year  1998.  The
Compensation  Committee  administers  the Company's  Stock Option Plans and 1990
Employee Stock Purchase Plan and determines  salaries and other compensation for
officers and employees.

Directors Compensation

         The Company paid Mr.  Bolger,  Mr.  Murphy,  Dr. Kailath and Mrs. Gupta
$19,000,  $19,000,  $18,500 and $17,500,  respectively in directors' fees during
fiscal year 1998.

         Members of the Board of Directors who are not employees, consultants or
independent  contractors of the Company, or any parent,  subsidiary or affiliate
of the Company,  are eligible to  participate  in the Company's  1994  Directors
Stock Option Plan (the "Directors  Plan"). For a discussion of the provisions of
the Directors  Plan,  see "Proposal No. 3 - Approval of an Amendment to the 1994
Directors  Stock Option Plan." In fiscal year 1998,  each eligible  director was
granted an option to purchase 5,000 shares of the Company's  Common Stock on the
anniversary  of such  director  joining  the Board,  at the  following  exercise
prices:  Mr. Bolger,  $12.875 per share; Mrs. Gupta and Dr. Kailath,  $10.25 per
share; and Mr. Murphy, $13.375 per share.

                                     - 3 -




                PROPOSAL NO. 2 - APPROVAL OF THE ADOPTION OF THE
                           1998 EQUITY INCENTIVE PLAN

         The  Company's  1988 Stock Option Plan (the "1988 Plan") will expire in
September  1998.  Accordingly,  on March 30, 1998, the Board of Directors of the
Company  approved  the  adoption  of the 1998 Equity  Incentive  Plan (the "1998
Plan"),  which provides for awards of options to purchase shares of Common Stock
("Options"),  Restricted Stock and Stock Bonuses  (collectively  "Awards").  The
number of  shares  of Common  Stock  issuable  under the  proposed  1998 Plan is
1,000,000  shares.  The Shareholders are being asked to approve the 1998 Plan. A
description  of the  principle  features  of the 1998 Plan is set  forth  below.
Options to purchase Common Stock will continue to be granted under the 1988 Plan
until it expires, at which time the 1998 Plan will become effective.  All equity
awards  previously  granted under the 1988 Plan would continue to be governed by
the  terms of the  1988  Plan  and the  individual  option  grants.  All  shares
previously  reserved for and still  available  for grant under the 1988 Plan, as
well as shares that become  available  due to  cancellations  or  forfeiture  of
equity awards outstanding under the 1988 Plan will become available for issuance
under the 1998 Plan.

Purpose

         The  purpose  of the 1998 Plan is to  provide  incentives  to  attract,
retain and motivate  eligible persons whose present and potential  contributions
are important to the success of the Company,  by offering them an opportunity to
participate  in the  Company's  future  performance  through  awards of Options,
Restricted Stock and Stock Bonuses.

Administration

         The 1998 Plan shall be  administered by the  Compensation  Committee of
the Board (the  "Committee"  or the  "Board".)  Subject to the terms of the 1998
Plan, the Committee determines the persons who are to receive Awards, the number
of shares subject to each Award and the terms and conditions of such Awards. The
Committee also has the authority to construe and interpret any of the provisions
of the 1998  Plan,  any Award  agreement  and any other  agreement  or  document
executed pursuant to the 1998 Plan.

Shares Subject to the 1998 Plan

         The stock  subject  to  Awards  under  the 1998  Plan  consists  of the
Company's  authorized  but  unissued  Common  Stock.  The total number of shares
reserved and available for grant and issuance  pursuant to the 1998 Plan will be
1,000,000  shares  plus (a) any  authorized  shares  not  issued or  subject  to
outstanding  grants under the 1988 Plan; (b) shares that are subject to issuance
upon  exercise of an option  granted under the 1988 Plan but cease to be subject
to such option for any reason other than exercise of such option; and (c) shares
that were issued under the 1988 Plan which are repurchased by the Company at the
original issue price or forfeited. Shares subject to an Option granted under the
1998 Plan that expire or terminate  for any reason  without  being  exercised or
shares subject to an Award granted under the 1998 Plan that are forfeited or are
repurchased  by the  Company at the  original  issue  price or are subject to an
Award granted under the 1998 Plan that otherwise terminates without shares being
issued,  will again become  available for grant and issuance  pursuant to Awards
under the 1998 Plan. This number of shares is subject to proportional adjustment
to reflect stock splits, stock dividends and other similar events.

Eligibility

         Employees,  officers, directors,  consultants,  independent contractors
and advisors of the Company (and of any  subsidiaries  and  affiliates)  will be
eligible to receive Awards under the 1998 Plan (the  "Participants").  No person
will be eligible to receive more than 200,000  shares in any calendar year under
the 1998 Plan, other than new employees of the Company  (including new employees
who are also officers and directors of the Company), who are eligible to receive
up to a maximum of 1,000,000  shares in the calendar year in which they commence
their  employment.  A person may be granted  more than one Award  under the 1998
Plan.  The closing  price of the Company's  Common Stock on the Nasdaq  National
Market was $20.875 per share on May 21, 1998.

Stock Options

         The 1998 Plan  permits  the  granting of Options  that are  intended to
qualify either as Incentive Stock Options ("ISOs") or Nonqualified Stock Options
("NQSOs").  ISOs  may be  granted  only to  employees  (including  officers  and
directors who are also  employees) of the Company or any parent or subsidiary of
the Company.  The exercise price for each ISO share must be no less than 100% of
the "fair market value" (as defined in the 1998 Plan) of a share of Common Stock
at the time of grant.  The exercise price of an ISO granted to a 10% shareholder
must be no less than 110% of the fair market value of a share of Common Stock at
the time of grant.  The exercise  price for each NQSO share must be no less than
85% of the fair  market  value of a share of Common  Stock at the time of grant.
Options granted under the 1998 Plan will have a term of up to ten years,  except
for ISOs  granted  to 10%  shareholders,  which  will  have a term of up to five
years.

         The exercise  price of Options  granted under the 1998 Plan may be paid
as approved by the Committee at the time of grant:  (1) in cash (by check);  (2)
by  cancellation  of  indebtedness  of the  Company to the  Participant;  (3) by
surrender of shares of the Company's  Common Stock owned by the  Participant for
at least six  months  and having a fair  market  value on the date of  surrender
equal to the aggregate exercise price of the Option or that were obtained by the
Participant  in the open  market;  (4) by tender of a full  recourse  promissory
note; (5) by waiver of  compensation  due to or accrued by the  Participant  for
services rendered;  (6) by a "same-day sale" commitment from

                                     - 4 -



the Participant and a National Association of Securities Dealers,  Inc. ("NASD")
broker; (7) by a "margin" commitment from the Participant and an NASD broker; or
(8) by any combination of the foregoing.

Restricted Stock Awards

         The  Committee  may  grant  Participants  Restricted  Stock  Awards  to
purchase  stock  under  the  1998  Plan,   under  such  terms,   conditions  and
restrictions  as the Committee may determine.  These  restrictions  may be based
upon  completion  of a specified  number of years of service with the Company or
upon completion of performance  goals as determined by the Committee on the date
of the Award.  The purchase price of shares sold pursuant to a Restricted  Stock
Award will be  determined  by the Committee on the date of the Award (and in the
case of an Award granted to a 10% shareholder,  the purchase price shall be 100%
of fair market  value) and can be paid for in any of the forms of  consideration
listed in "Stock Options" above, as are approved by the Committee at the time of
grant.

Stock Bonus Awards

         The  Committee  may grant Stock Bonus Awards under the 1998 Plan,  with
such terms,  conditions and restrictions as the Committee may determine. A Stock
Bonus  Award may be  awarded  upon  satisfaction  of such  performance  goals as
determined by the Committee at the date of the Award.

Mergers, Consolidations, Change of Control

         In the event of a merger, consolidation,  dissolution or liquidation of
the Company,  the sale of substantially  all of the assets of the Company or any
other  similar  corporate  transaction,  the successor  corporation  may assume,
convert  or  replace  any or all  Awards  outstanding  under  the  1998  Plan or
substitute  equivalent awards or provide  substantially similar consideration to
Participants  as was provided to  shareholders of the Company (after taking into
account the existing  provisions of the Awards). In the event that the successor
corporation does not assume, convert,  replace or substitute Awards, the vesting
of such Awards will  accelerate and the Options will become  exercisable in full
prior to the  consummation of such event at such times and on such conditions as
the  Committee  determines,  and if such  Options are not  exercised  before the
consummation  of the corporate  transaction,  they will  terminate in accordance
with the provisions of the 1998 Plan. The successor  corporation may also issue,
in  place  of  outstanding  shares  of the  Company  held  by  the  Participant,
substantially   similar   shares  or  other   property   subject  to  repurchase
restrictions no less favorable to the Participant.

Amendment of the 1998 Plan

         The Board may at any time  terminate or amend the 1998 Plan,  including
amending any form of Award  agreement or instrument  to be executed  pursuant to
the 1998 Plan. However, the Board may not amend the 1998 Plan in any manner that
requires   shareholder   approval  pursuant  to  the  Code  or  the  regulations
promulgated thereunder.

Term of the 1998 Plan

         Unless  terminated  earlier as provided in the 1998 Plan, the 1998 Plan
will expire in March 2008,  ten years after the date the Board  adopted the 1998
Plan.

Federal Income Tax Information

THE FOLLOWING IS A GENERAL SUMMARY AS OF THE DATE OF THIS PROXY STATEMENT OF THE
FEDERAL INCOME TAX CONSEQUENCES TO THE COMPANY AND  PARTICIPANTS  UNDER THE 1998
PLAN.  FEDERAL  TAX LAWS  MAY  CHANGE  AND THE  FEDERAL,  STATE  AND  LOCAL  TAX
CONSEQUENCES  FOR  ANY  PARTICIPANT  WILL  DEPEND  UPON  HIS OR  HER  INDIVIDUAL
CIRCUMSTANCES. EACH PARTICIPANT HAS BEEN AND IS ENCOURAGED TO SEEK THE ADVICE OF
A QUALIFIED TAX ADVISOR  REGARDING THE TAX  CONSEQUENCES OF PARTICIPATION IN THE
1998 PLAN.

         Incentive  Stock Options.  A Participant  will recognize no income upon
grant of an ISO and incur no tax on its  exercise  (unless  the  Participant  is
subject to the  alternative  minimum tax  ("AMT") as  described  below).  If the
Participant holds shares acquired upon exercise of an ISO (the "ISO Shares") for
more than one year after the date the Option was exercised and for more than two
years after the date the Option was  granted,  the  Participant  generally  will
realize  capital  gain or loss  (rather  than  ordinary  income  or  loss)  upon
disposition of the ISO Shares. This gain or loss will be equal to the difference
between the amount  realized upon such  disposition  and the amount paid for the
ISO Shares.

         If the  Participant  disposes of ISO Shares prior to the  expiration of
either  required  holding  period  (a  "disqualifying  disposition"),  the  gain
realized upon such  disposition,  up to the  difference  between the fair market
value of the ISO  Shares  on the date of  exercise  (or,  if  less,  the  amount
realized  on a sale of such  shares)  and the  option  exercise  price,  will be
treated as ordinary income. Any additional gain will be capital gain, taxed at a
rate  that  depends  upon the  amount  of time the ISO  Shares  were held by the
Participant.

                                     - 5 -



         Alternative  Minimum Tax. The difference  between the fair market value
of the  ISO  Shares  on the  date  of  exercise  and the  exercise  price  is an
adjustment  to income for  purposes  of AMT.  The AMT  (imposed to the extent it
exceeds  the  taxpayer's  regular  tax)  is  26%  of  an  individual  taxpayer's
alternative  minimum  taxable  income  (28% in the case of  alternative  minimum
taxable  income in excess of  $175,000).  A maximum 20% AMT rate  applies to the
portion of alternative minimum taxable income that would otherwise be taxable as
net capital gain.  Alternative minimum taxable income is determined by adjusting
regular taxable income for certain items,  increasing that income by certain tax
preference items (including the difference  between the fair market value of the
ISO Shares on the date of exercise and the exercise  price),  and reducing  this
amount by the applicable  exemption  amount  ($45,000 in case of a joint return,
subject  to  reduction   under  certain   circumstances).   If  a  disqualifying
disposition  of the ISO Shares  occurs in the same  calendar year as exercise of
the ISO, there is no AMT adjustment with respect to those ISO Shares. Also, upon
a sale  of ISO  Shares  that  is not a  disqualifying  disposition,  alternative
minimum  taxable income is reduced in the year of sale by the excess of the fair
market  value of the ISO Shares at  exercise  over the  amount  paid for the ISO
Shares.

         Nonqualified  Stock  Options.  A  Participant  will not  recognize  any
taxable  income at the time an NQSO is  granted.  However,  upon  exercise of an
NQSO, the Participant  must include in income as compensation an amount equal to
the  difference  between  the fair  market  value of the  shares  on the date of
exercise and the  Participant's  exercise  price.  The  included  amount must be
treated as ordinary  income by the Participant and may be subject to withholding
by  the  Company   (either  by  payment  in  cash  or  withholding  out  of  the
Participant's  salary).  Upon  resale  of the  shares  by the  Participant,  any
subsequent  appreciation  or  depreciation  in the value of the  shares  will be
treated as capital gain or loss.

         Restricted  Stock and Stock Bonus  Awards.  Restricted  stock and stock
bonus  awards will  generally  be subject to tax at the time of receipt,  unless
there are restrictions that enable the Participant to defer tax. At the time the
tax is incurred,  the tax treatment will be similar to that discussed  above for
NQSOs.

         Maximum Tax Rates.  The maximum tax rate  applicable to ordinary income
is 39.6%.  Long-term capital gain is taxed at a maximum rate of 20% and mid-term
capital  gain is taxed at a maximum  rate of 28%. To receive  long-term  capital
gain  treatment,  the stock must be held for more than eighteen  months,  and to
receive  mid-term  capital gain treatment,  the stock must be held for more than
one year but not more  than  eighteen  months.  Capital  gains  may be offset by
capital losses and up to $3,000 of capital losses may be offset annually against
ordinary income.

         Tax Treatment of the Company. The Company generally will be entitled to
a deduction in connection  with the exercise of an NQSO by a Participant  or the
receipt of Restricted Stock or Stock Bonus Awards by a Participant to the extent
that the  Participant  recognizes  ordinary  income,  provided  that the Company
timely reports such income to the Internal Revenue Service.  The Company will be
entitled to a deduction in connection with the disposition of ISO Shares only to
the extent that the  Participant  recognizes  ordinary income on a disqualifying
disposition of the ISO Shares.

ERISA

         The 1998 Plan is not subject to any of the  provisions  of the Employee
Retirement  Income  Security Act of 1974  ("ERISA") and is not  qualified  under
Section 401(a) of the Code.

New Plan Benefits

         The  amounts  of  future  Option  grants  under  the 1998  Plan are not
determinable because,  under the terms of the 1998 Plan, such grants are made in
the  discretion  of  the  Committee.  Future  Option  exercise  prices  are  not
determinable  because  they are based upon fair  market  value of the  Company's
Common Stock on the date of grant.

Vote Required

         Approval of the 1998 Plan requires the affirmative vote of the majority
of shares of  Common  Stock  present  in person or  represented  by proxy at the
Meeting.


  THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR APPROVAL OF THE ADOPTION OF THE
                           1998 EQUITY INCENTIVE PLAN.

                                     - 6 -




                  PROPOSAL NO. 3 - APPROVAL OF AN AMENDMENT TO
                      THE 1994 DIRECTORS STOCK OPTION PLAN


         The  shareholders  are being asked to approve an  amendment to the 1994
Directors  Stock Option Plan (the  "Directors  Plan") to eliminate the provision
which limits the maximum number of shares that may be issued to any one Director
to 40,000 shares.

         The Board believes that removal of this provision of the Directors Plan
is in the best  interests  of the  Company  because  of the  continuing  need to
provide equity  participation  to attract and retain quality outside  directors.
The Directors Plan plays an important  role in the Company's  efforts to attract
and retain outside directors of outstanding ability.

         The Board approved the proposed amendment on March 30, 1998, subject to
shareholder  approval.  Approval of the Amendment to the Directors Plan requires
the affirmative vote of the majority of shares of Common Stock present in person
or represented by proxy at the Meeting.

         Below is a summary of the principal  provisions of the Directors  Plan,
assuming shareholder  approval of the amendment.  The summary is not necessarily
complete, and reference is made to the full text of the Directors Plan.

Directors Plan History

         The Directors  Plan was adopted by the Board in March 1994 and approved
by the  shareholders  in July  1994.  The  purpose of the  Directors  Plan is to
enhance the Company's  ability  through the use of equity  incentives to attract
and retain highly qualified outside directors.

Stock Subject to Options

         The stock  subject to options  under the  Directors  Plan  consists  of
shares of the Company's  authorized  but unissued  Common  Stock.  The aggregate
number of shares that may be issued  pursuant to the  Directors  Plan is 400,000
shares of Common  Stock,  subject to  proportional  adjustment  to reflect stock
splits,  stock  dividends  and  other  similar  events.  In the  event  that any
outstanding  option under the Directors  Plan expires or is  terminated  for any
reason, the shares of Common Stock allocable to the unexercised  portion of such
option  will again be  available  for the grant of options  under the  Directors
Plan.

Administration

         The Directors Plan is administered by the Board. The  interpretation by
the Board of any of the  provisions of the Directors  Plan or any option granted
under the Directors Plan will be final and conclusive.

Eligibility

         Under the Directors Plan, the Company  automatically  grants options to
each  director  of the  Company who is not an employee of the Company (or of any
parent, subsidiary or affiliate of the Company) (the "Outside Directors").  Each
Outside Director is automatically granted an option to purchase 15,000 shares of
Common  Stock on the date the  Outside  Director  first  becomes a member of the
Board (an "Initial Grant"). In addition,  each Outside Director is automatically
granted an option to purchase 5,000 shares of Common Stock on the anniversary of
his or her Initial Grant, so long as he or she  continuously  remains a director
of the Company (a "Succeeding Grant").

         As of February 28, 1998,  four persons were eligible to receive options
pursuant to the Directors Plan and the Company's current non-employee  directors
as a group had been granted  options to purchase an aggregate of 205,000  shares
under the  Directors  Plan. At that date,  options to purchase  5,000 shares had
been issued upon  exercise of options  and  195,000  shares were  available  for
future grants pursuant to the Directors Plan. The closing price of the Company's
Common  Stock on the Nasdaq  National  Market was  $20.875  per share on May 21,
1998.

Terms of Option Grants

         Options  granted  pursuant  to the  Directors  Plan are  intended to be
NQSOs. Each Initial Grant and Succeeding Grant will have a term of ten years and
become  exercisable  at the  rate of 2.08%  per  month,  so long as the  Outside
Director  continuously  remains a director of the Company.  The option  exercise
price will be the "fair market value" (as defined in the Directors  Plan) of the
Common  Stock as of the date of the  grant.  The option

                                     - 7 -




exercise price will be payable in cash (by check) and in a number of other forms
of  consideration,  including  fully paid  shares of Common  Stock  owned by the
Outside  Director  for more than six months,  by waiver of  compensation  due or
accrued to the  Outside  Director  for  services  rendered,  through a "same day
sale,"  through  a  "margin  commitment,"  or  through  any  combination  of the
foregoing.

Mergers, Consolidations, Change of Control

         In the event of a merger, consolidation,  dissolution or liquidation of
the Company,  the sale of substantially  all of the assets of the Company or any
other similar corporate transaction, the vesting of all options granted pursuant
to the Directors Plan will  accelerate and such options will become  exercisable
in full  before  the  consummation  of such  event  at  such  times  and on such
conditions as the Board determines.

Amendment of the Directors Plan

         The Board may terminate or amend the Directors Plan; provided, however,
that the Board may not, without shareholder approval,  increase the total number
of shares of Common Stock  available for issuance  under the  Directors  Plan or
change  the class of  persons  eligible  to  receive  options.  In any case,  no
amendment  of the  Directors  Plan may  adversely  affect  any then  outstanding
options or any unexercised  portions  thereof without the written consent of the
optionee.

Term of the Directors Plan

         Unless  terminated  earlier as provided in the Directors Plan,  options
may be granted  pursuant to the Directors  Plan from time to time up until March
2004, ten years after the date the Board adopted the Directors Plan.

Federal Income Tax Information

         For the  federal tax  implications  to the  Outside  Directors  and the
Company for options  granted under the Directors Plan, see the discussion of the
tax  implications  of NQSOs in "Proposal No. 2 - Approval of the Adoption of the
1998 Equity Incentive Plan - Federal Income Tax Information" above.

ERISA

         The Directors Plan is not subject to any of the provisions of ERISA nor
is it qualified under Section 401(a) of the Code.

New Plan Benefits

         Only Outside  Directors of the Company are eligible to  participate  in
the  Directors  Plan.  The  grant of  options  under the  Directors  Plan is not
discretionary.   Under  the   Directors   Plan,   each  outside   director  will
automatically  be granted an option to purchase  5,000  shares of the  Company's
Common Stock on the anniversary of such Outside Director's previous grants under
the Directors  Plan.  Any outside  director who first joins the Board before the
next annual meeting will  automatically  be granted an option to purchase 15,000
shares of the Company's Common Stock on the date of his or her first appointment
to the Board. The exercise prices of these options are not determinable  because
they are equal to fair market value of the Company's Common Stock on the date of
grant.


  THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR APPROVAL OF THE AMENDMENT TO THE
                        1994 DIRECTORS STOCK OPTION PLAN

                                     - 8 -




      PROPOSAL NO. 4 - RATIFICATION OF SELECTION OF INDEPENDENT ACCOUNTANTS

         The Company has  selected  Coopers & Lybrand  L.L.P.  as its  principal
independent  accountants  to  perform  the  audit  of  the  Company's  financial
statements for the current fiscal year, and the  shareholders are being asked to
ratify  this  selection.  Representatives  of Coopers & Lybrand  L.L.P.  will be
present at the Meeting,  will be given an opportunity to make a statement at the
Meeting if they desire to do so and will be available to respond to  appropriate
questions.

                THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR THE
            RATIFICATION OF THE SELECTION OF COOPERS & LYBRAND L.L.P.


         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT


         The following table sets forth certain information, as of May 21, 1998,
with respect to the  beneficial  ownership of the Company's  Common Stock by (i)
each shareholder known by the Company to be the beneficial owner of more than 5%
of the  Company's  Common  Stock,  (ii) each  director and  nominee,  (iii) each
executive  officer  named in the Summary  Compensation  Table below and (iv) all
officers and directors as a group.


Name of                                       Amount and Nature of
Beneficial Owner                             Beneficial Ownership (1)          Percent of Class
- ----------------                             ------------------------          ----------------
                                                                             
Narendra K. and Vinita Gupta (2)(3)                  4,770,813                     20.3%
Franklin Advisors, Inc. (4)                          2,494,990                     10.6%
Nevis Capital Management (5)                         2,301,799                      9.8%
Thomas Kailath (3)(6)                                  824,663                      3.5%
Karen D. Auerbach (3)                                  254,040                      1.1%
David P. St. Charles (3)                               194,533                       *
Joseph Addiego (3)                                      84,136                       *
John C. Bolger (3)                                      45,250                       *
Richard C. Murphy (3)                                   35,938                       *
William C. Smith (3)                                     5,000                       *
Janice E. Waterman (3)                                   3,450                       *
Michael A. Brochu (3)                                      938                       *
All officers and directors as a group
   (13 persons) (4)                                  6,361,850                     27.1%
                                                              
<FN>
- ----------------------------------
* Less than 1%


(1)  Unless  otherwise  indicated  below,  the persons and entities named in the
     table have sole voting and sole investment power with respect to all shares
     beneficially owned, subject to community property laws.

(2)  Represents  (i)  185,540  shares of Common  Stock held of record by Dr. and
     Mrs.  Gupta,  (ii)  3,531,660  shares held in The Narendra and Vinita Gupta
     Living Trust, (iii) 1,000,000 shares held of record by them,  together with
     a third party,  as trustees for their  children,  as to which they disclaim
     beneficial ownership,  (iv) 7,800 shares held by Dr. Gupta as custodian for
     his  daughter  under  the  Uniform  Gifts  to  Minors  Act,  as to which he
     disclaims  beneficial  ownership and (v) 42,813  shares  subject to options
     held by Mrs. Gupta that are exercisable within 60 days of May 21, 1998. The
     address of Dr. and Mrs. Gupta is c/o Integrated Systems,  Inc., 201 Moffett
     Park Drive, Sunnyvale, CA, 94089.

(3)  Includes  42,813  shares for Mrs.  Gupta,  42,813  shares for Dr.  Kailath,
     12,500 shares for Ms. Auerbach,  192,000 shares for Mr. St. Charles, 53,063
     shares for Mr. Addiego, 41,250 shares for Mr. Bolger, 30,938 shares for Mr.
     Murphy,  5,000 shares for Mr.  Smith,  3,188 shares for Ms.  Waterman,  938
     shares for Mr. Brochu, and 531,982 shares for all directors and officers as
     a group that are subject to options and are  exercisable  within 60 days of
     May 21, 1998.

(4)  The address of this  shareholder is Franklin  Advisors,  Inc., 901 Mariners
     Island  Blvd.,  San Mateo,  CA , 94404.  As of January 30,  1998,  Franklin
     Advisors,  Inc.  ("Franklin")  reported on Schedule  13G filed with the SEC
     that it beneficially  owned 2,529,540 shares of the Company's Common Stock.
     Franklin has since orally informed the Company that, as of May 21, 1998, it
     owned 2,494,990 shares of the Company's Common Stock.

(5)  The address of this shareholder is Nevis Capital Management, Inc., 1119 St.
     Paul  Street,  Baltimore,  Maryland,  21202.  As of April 28,  1998,  Nevis
     Capital  Management  ("Nevis")  reported on Schedule 13G filed with the SEC
     that it beneficially  owned 2,354,499 shares of the Company's Common Stock.
     Nevis has since orally  informed the Company  that,  as of May 21, 1998, it
     owned 2,301,799 shares of the Company's Common Stock.

(6)  Represents (i) 381,850 shares of Common Stock held of record by Dr. Kailath
     and his wife as trustees of a revocable trust,  (ii) 400,000 shares held of
     record by them,  together  with a third party,  as trustees for their three
     children, and as custodians for their son under the Uniform Gifts to Minors
     Act and (iii) 42,813 shares subject to options held by Dr. Kailath that are
     exercisable within 60 days of May 21, 1998.
</FN>


                                     - 9 -




EXECUTIVE COMPENSATION

         The following table sets forth all compensation awarded, earned or paid
to the  Company's  Chief  Executive  Officer,  Chairman  of the  Board,  and the
Company's four other most highly compensated executive officers who were serving
as executive  officers at the end of fiscal year 1998, for services  rendered in
all capacities to the Company and its  subsidiaries  during each of fiscal years
1996,  1997 and  1998.  This  information  includes  the  dollar  values of base
salaries and bonus awards, the number of stock options granted and certain other
compensation, if any, whether paid or deferred. The Company does not grant stock
appreciation  rights ("SARs") and has no long-term  compensation  benefits other
than options.


                                                     SUMMARY COMPENSATION TABLE


                                                                                                        Long-Term
                                                                                                      Compensation
                                                                          Annual Compensation             Awards
                                                                      ---------------------------       -----------
                                                                                                        Securities       All Other
                                                                                                        Underlying      Compensation
Name and                                                              Salary (1)        Bonus (2)       Options (3)         (4)
Principal Position                                       Year            ($)               ($)              (#)             ($)
- -------------------                                      ----         ----------        ---------       -----------     -----------
                                                                                                           
David P. St. Charles                                      FY98         $250,000             --            160,000         $  1,154
President and CEO                                         FY97         $257,462             --            100,000         $  2,113
                                                          FY96         $209,056         $ 90,000           60,000         $  1,397

Narendra K. Gupta                                         FY98         $ 71,155             --               --           $  1,692
Chairman and Secretary                                    FY97         $181,742             --               --           $  2,510
                                                          FY96         $174,434         $ 65,000             --           $  2,357

Joseph Addiego(5)                                         FY98         $266,470             --            135,000         $  2,623
Vice President,                                           FY97         $274,303             --             40,000         $  2,177
Marketing                                                 FY96         $249,222         $ 15,000           20,000         $  2,211

William C. Smith                                          FY98         $175,000         $ 50,000           80,000         $  2,423
Vice President,                                           FY97   (6)   $ 23,558             --             80,000         $    202
Finance and CFO                                           FY96             --               --               --               --

Karen D. Auerbach                                         FY98   (7)   $180,000         $ 15,000           50,000         $  2,423
Vice President & General Manager                          FY97             --               --               --               --
Design Automation Solutions                               FY96             --               --               --               --

Janice E. Waterman                                        FY98         $159,807         $ 27,000           51,000         $  2,577
Vice President,                                           FY97         $160,817             --             20,000         $  1,919
Human Resources and Operations                            FY96         $ 72,692         $ 11,667           15,000         $  1,038

<FN>
- ----------------------------------

(1)  Includes commissions and deferrals for 401(k) and Section 125 Plans.

(2)  Represents  bonuses  earned for  services  rendered  during the fiscal year
     listed, but does not include bonuses paid during the fiscal year listed for
     services rendered during a prior fiscal year.

(3)  Options  issued prior to fiscal year 1997 reflect a 2-for-1  stock split of
     the Company effective April 5, 1996.

(4)  Represents employer matching contributions to 401(k) Plan accounts.

(5)  For fiscal  year  1996,  and from May 1, 1996  through  May 31,  1996,  Mr.
     Addiego served as Vice President, North American Sales.

(6)  Amount  listed is for a partial  fiscal year from the time Mr. Smith became
     an executive  officer of the Company in January 1997 through the end of the
     fiscal year.

(7)  Ms.  Auerbach was  appointed  Vice  President and General  Manager,  Design
     Automation Solutions of the Company in May 1997.
</FN>


                                     - 10 -




         The following table sets forth further information regarding individual
grants of options for the Company's Common Stock during fiscal year 1998 to each
of the executive  officers  named in the Summary  Compensation  Table above.  In
accordance  with the rules of the SEC,  the table  sets  forth the  hypothetical
gains or "option  spreads"  that would exist for the options at the end of their
respective  ten-year terms based on assumed  annualized  rates of compound stock
price  appreciation of 5% and 10% from the dates the options were granted to the
end of the respective  option terms.  Actual gains, if any, on option  exercises
are  dependent  on the future  performance  of the  Company's  Common  Stock and
overall  market  conditions.  There  can  be no  assurance  that  the  potential
realizable values shown in this table will be achieved.


                                                  OPTION GRANTS IN FISCAL YEAR 1998


                                                                                                          Potential Realizable
                                                                                                            Value at Assumed
                                                                                                          Annual Rates of Stock
                                                                                                           Price Appreciation
                                                                 Individual Grants                           For Option Term
                                              -----------------------------------------------------     ----------------------------
                                               Number               % of
                                                 of                Total
                                             Securities           Options
                                             Underlying           Granted    Exercise
                                               Options               in       or Base     Expira-
                                               Granted             Fiscal      Price        tion            5%              10%
     Name                                      (1) (#)              1998      $/Share       Date          ($) (3)         ($) (3)
- --------------------                          ---------           --------    --------    ---------     ------------     -----------
                                                                                                        
David P. St. Charles                            60,000             2.6797      10.750      4/13/07       $  405,800       $1,027,800
                                               100,000(2)          4.4662      10.250      4/16/07       $  645,000       $1,634,000

Narendra K. Gupta                                 --                 --          --          --               --               --

Joseph Addiego                                  25,000             1.1165      10.750      4/13/07       $  169,000       $  428.250
                                                60,000(2)          2.6797       8.750      4/17/07       $  330,000       $  837,000
                                                50,000             2.2331      15.375       2/6/08       $  483,250       $1,225,250

William C. Smith                                80,000(2)          3.5730      10.250      4/16/07       $  516,000       $1,307,200

Karen D. Auerbach                               40,000             1.7865      10.750      4/13/07       $  270,400       $  685,200
                                                10,000             0.4466      19.875      9/14/07       $  124,950       $  316,750

Janice E. Waterman                              10,000             0.4466      10.750      4/13/07       $   67,400       $  171,300
                                                41,000(2)          1.8311       8.750      4/17/07       $  225,500       $  571,950

<FN>
- ----------------------------------

(1)  The options shown in the table were granted  pursuant to the Company's 1988
     Stock Option  Plan.  They were granted at fair market value and will expire
     ten years  from the date of grant,  subject  to  earlier  termination  upon
     termination  of  the  optionee's   employment.   Options  generally  become
     exercisable  over a period  of four  years,  at a rate of 25% on the  first
     anniversary date after the date of grant,  then 1/48th of the shares at the
     end of each month thereafter.

(2)  Represents Options that were canceled and regranted in April 1997. In April
     1997, the Company offered employees the right to cancel certain outstanding
     stock  Options at original  exercise  prices and receive new Options with a
     new exercise price.  The new exercise prices range from $8.75 to $10.50 per
     share,  based  on  the  closing  price  of the  Common  Stock  on the  date
     individual employees agreed to cancel their Options.  Options to purchase a
     total of 1,222,632 shares were issued in April 1997.  Vesting under the new
     Options  commenced on the date the  individual  employees  agreed to cancel
     their original  Options,  and occurs over a four year period.  The exercise
     prices and  expiration  dates shown above  reflect the exercise  prices and
     expiration dates of the new grants.

(3)  The 5% and 10% assumed rates of annual  compound  stock price  appreciation
     are  mandated by the rules of the SEC and do not  represent  the  Company's
     estimate or projection of future Common Stock prices.
</FN>


                                     - 11 -




         The  following  table sets forth  certain  information  concerning  the
exercise  of stock  Options  during  fiscal  year 1998 by each of the  executive
officers named in the Summary  Compensation Table above and the number and value
at February 28, 1998 of unexercised Options held by them:


                         AGGREGATED OPTION EXERCISES IN FISCAL YEAR 1998
                                AND FEBRUARY 28, 1998 OPTION VALUES


                                                                                    Number of                       Value of
                                                                             Securities Underlying            Unexercised In-the
                                                                               Unexercised Options               Money Options
                                                                                  at 2/28/98                    at 2/28/98  (2)
                                                                             ----------------------         ----------------------
                                             Shares
                                            Acquired        Value
                                               on          Realized           Exer-         Unexer-          Exer-         Unexer-
       Name                                  Exercise      ($) (1)           cisable        cisable         cisable        cisable
- ---------------------                        --------      -------           -------        -------         -------        -------
                                                                                                        
David P. St. Charles                            --              --           148,833         196,667      $1,524,298      $2,726,589

Narendra K. Gupta                               --              --              --              --              --              --

Joseph Addiego                                25,484      $  159,557          21,000          99,000      $  243,802      $  802,325

William C. Smith                                --              --              --            80,000            --        $  544,960

Karen D. Auerbach                               --              --              --            50,000            --        $  252,480

Janice E. Waterman                              --              --              --            51,000            --        $  403,912

<FN>
- ----------------------------------

(1)  "Value  Realized"  represents the fair market value of the shares of Common
     Stock  underlying  the Option on the date of  exercise  less the  aggregate
     exercise price of the Option.

(2)  These values have not been,  and may never be,  realized.  These values are
     based on the positive  spread  between the  respective  exercise  prices of
     outstanding  Options and the closing price of the Company's Common Stock on
     February 27, 1998, the last day of trading for fiscal year 1998.
</FN>



          COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

         The Compensation  Committee of the Board makes all decisions  involving
the compensation of executive officers of the Company.  During fiscal year 1998,
the Compensation  Committee consisted of the following  non-employee  directors:
John C. Bolger, Dr. Thomas Kailath and Richard C. Murphy.


             COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION

         Through the entire fiscal year 1998, the Compensation  Committee of the
Board was comprised of three  non-management  directors of the Company,  John C.
Bolger,  Thomas Kailath, and Richard C. Murphy. David P. St. Charles,  President
and Chief Executive Officer, evaluated the performance of all executive officers
and  recommended  salary  adjustments  which were  reviewed  and approved by the
Compensation   Committee.   Performance  evaluations  for  individual  executive
officers are based on  predetermined  individual  goals. For the Company's Chief
Executive  Officer  and  Chairman  of the  Board,  these  goals  are  set by the
Compensation Committee,  and for all other officers, these goals are recommended
by the Chief  Executive  Officer and reviewed  and approved by the  Compensation
Committee.  Mr. St. Charles and Dr. Gupta did not participate in any discussions
regarding recommended salary adjustments for themselves.

         The Compensation Committee is responsible for setting and administering
the policies  governing  annual  compensation of the executive  officers and the
Chairman  of the  Board  of the  Company.  These  policies  are  based  upon the
philosophy  that the  Company's  long-term  success in its  marketplace  is best
achieved  through  recruitment and retention of the best people in the industry.
The Compensation  Committee applies this philosophy in determining  compensation
for  Company  executive  officers  in three  areas:  salary,  bonuses  and stock
options. The Compensation  Committee believes that the compensation of the Chief
Executive  Officer,  the Chairman of the Board and the Company's other executive
officers should be greatly influenced by the Company's  performance.  Consistent
with this philosophy, a designated portion of the compensation of each executive
is contingent upon corporate  performance and adjusted where appropriate,  based
on an executive's  performance  against personal  performance  objectives.  Each
executive officer's  performance for the last fiscal year and objectives for the

                                     - 12 -




subsequent year are reviewed, together with the executive's responsibility level
and the Company's fiscal performance versus objectives and potential performance
targets for the subsequent  year. The  Compensation  Committee  administers  the
Company's  equity  plans,  including  the 1988  Stock  Option  Plan and the 1990
Employee Stock Purchase Plan.

Salary

         The Company  strives to offer  salaries to its executive  officers that
are  competitive  in  its  industry  for  similar  positions  requiring  similar
qualifications.  In determining  executive officers  salaries,  the Compensation
Committee considers information provided by the Vice President,  Human Resources
and Operations,  whose recommendations are based upon salary surveys specific to
the Company's industry,  size and geographic location. Such surveys are prepared
by  an  independent  organization  using  information  provided  from  over  300
companies. These surveys summarize information from companies that closely match
the  Company  in terms of such  things as  product or  industry,  geography  and
revenue levels. To this end, the Compensation Committee attempted to compare the
compensation of the Company's executive officers with the compensation practices
of the survey  companies to determine  base  salary,  target  bonuses and target
total cash  compensation.  In  preparing  the  performance  graph for this Proxy
Statement,  the  Company  used the  Hambrecht  & Quist  Technology  Index as its
published  line of business  index.  The  compensation  practices of most of the
companies in the Hambrecht & Quist  Technology Index were not reviewed in detail
by the  Company  when  the  Compensation  Committee  reviewed  the  compensation
information  discussed  above because such companies  were  determined not to be
directly competitive with the Company for executive talent. In addition to their
base salaries,  the Company's executive officers,  including the Chief Executive
Officer and Chairman of the Board, are each eligible to receive a cash bonus and
are entitled to  participate  in the 1988 Stock  Option Plan.  The bonus for the
Chief Executive Officer, Chairman of the Board and for other executives is based
primarily on Company performance.

         The foregoing  information was presented to the Compensation  Committee
in March 1997.  The  Compensation  Committee  reviewed the  recommendations  and
performance  and market data outlined above and  established a base salary level
to be effective  March 1, 1997 for each executive  officer,  including the Chief
Executive  Officer and  Chairman of the Board.  In addition to  considering  the
results of the performance  evaluations and information  concerning  competitive
salaries,  the Compensation  Committee and Chief Executive Officer place primary
weight  on  the  financial  condition  of  the  Company  in  considering  salary
adjustments.

Bonuses

         The  Company  seeks to provide  additional  incentives  and  rewards to
executives who make contributions of outstanding value to the Company.  For this
reason, the Compensation  Committee administers a bonus plan, which can comprise
a  substantial  portion of the total  compensation  of executive  officers  when
earned and paid.

         The Compensation Committee determines annually the total amount of cash
bonuses available for executive  officers.  Awards under the plan are contingent
upon the  performance  of the  Company  as a  whole,  based  upon the  Company's
attaining  certain revenue and operating  profit goals set by the Board annually
in consultation with the Chief Executive Officer.  The target amounts of bonuses
available  to each  executive  officer  are  set  annually  by the  Compensation
Committee  in its  discretion  with  regard to the Chief  Executive  Officer and
Chairman of the Board and by the Chief Executive Officer,  subject to review and
approval by the Compensation Committee,  with regard to executive officers other
than himself.  In all cases, the relative target amounts for individual officers
are based upon the total  dollars  available  for bonuses,  and  historical  and
expected future  contributions by the individual  executive  officer.  In fiscal
1998, the objectives used by the Company as the basis for incentive compensation
were  based  primarily  on  Company  performance.   Executive  officers  earn  a
percentage  of  the  target  amounts  under  the  bonus  plan  relating  to  the
achievement  of  the  performance  goals  under  the  plan  by the  Company,  as
determined by the Committee  annually in its discretion.  Awards are weighted so
that proportionately  higher awards are received when the Company's  performance
exceeds  targets  and  proportionately  smaller  or no awards  are made when the
Company does not meet targets.

Stock Options

         The  Compensation  Committee  believes that employee  equity  ownership
provides  significant  additional  motivation to executive  officers to maximize
value for the  Company's  shareholders,  and  therefore  recommends to the Board
periodic  grants of stock options  under the  Company's  1988 Stock Option Plan.
Stock options are granted by the Compensation Committee in its discretion at the
prevailing  market price and will have value only if the  Company's  stock price
increases  over  the  exercise  price.  Therefore,  the  Compensation  Committee
believes that stock  options  serve to align the interest of executive  officers
closely with other shareholders because of the direct benefit executive officers
receive through improved stock performance.

         The Compensation  Committee makes option grants in its discretion after
consideration of  recommendations  from Mr. St. Charles and other members of the
Board.  Recommendations  for  options  are based  upon  relative  positions  and
responsibilities of executive officers, historical and expected contributions of
each  executive  officer to the  Company,  and  previous  option  grants to such
executive  officers.  Options are  recommended  with a goal of providing  equity
compensation for executive officers  competitive with that of executive officers
of  similar  rank in  other  companies  in the  Company's  industry,  geographic
location  and size.  Stock  options  typically  have been  granted to  executive
officers  when the  executive  first joins the  Company,  in  connection  with a
significant

                                     - 13 -




change in responsibilities,  and, occasionally,  to achieve equity within a peer
group.  The Committee in its discretion may,  however,  grant  additional  stock
options to executives  for other  reasons.  The number of shares subject to each
stock option granted is based on anticipated future  contribution and ability to
impact corporate results, past performance or consistency within the executive's
peer group. In fiscal 1998, the Committee  considered these factors,  as well as
the number of options  held by such  executive  officers as of the date of grant
that remained unvested.  Option grants for fiscal year 1998 are set forth in the
table above entitled "Option Grants in Fiscal Year 1998".

         In April 1997, the Compensation  Committee approved an option repricing
program.  All  employees,   including  executive  officers,   were  eligible  to
participate under the repricing  program.  All eligible  executive officers with
options  that had  exercise  prices  greater  than  closing  price on the Nasdaq
National  Market on the date of the  repricing,  had the option to exchange such
options on a  one-for-one  basis.  Options to purchase an aggregate of 1,222,632
shares of Common  Stock were  repriced,  with new exercise  prices  ranging from
$8.75 to $10.50 per share, based on the closing price of the Common Stock on the
Nasdaq National Market on the date individual  employees  agreed to cancel their
original  outstanding  options. Of these repriced options,  451,000 were held by
executive  officers of the Company.  The vesting schedule of the new options was
adjusted  to begin on the date  individual  employees  agreed  to  cancel  their
original outstanding options, with any prior vesting being forfeited.


The following table sets out certain information regarding information regarding
the repricing of options held by any executive officer of the Company during the
last ten fiscal years.


                                                       OPTION REPRICING TABLE
                                                                                                                         Length Of
                                                                                                                         Original
                                                                  Number Of                                             Option Term
                                                                 Securities                   Exercise                   Remaining
                                                                 Underlying   Market Price    Price At                   At Date Of
                                                                   Options    Of Stock At      Time Of         New      Repricing Or
                                                                 Repriced Or  Repricing Or   Repricing Or    Exercise    Amendment
        Name and Position                             Date       Amended (#)  Amendment ($)  Amendment ($)   Price ($)    (Years)
        -----------------                             ----       -----------  -------------  -------------   ---------    -------
                                                                                                          
David P. St. Charles                                 4/16/97       75,000      $  10.2500      $24.0000      $10.2500      8.99
    President and CEO                                4/16/97       25,000      $  10.2500      $24.0000      $10.2500      8.99
                                                                                                                       
Narendra K. Gupta                                       --           --              --            --            --          --
    Chairman and Secretary                                                                                             
                                                                                                                       
Joseph Addiego                                       4/17/97       20,000      $   8.7500      $14.6250      $ 8.7500      8.39
    Vice President, Marketing                        4/17/97       40,000      $   8.7500      $24.0000      $ 8.7500      8.99
                                                     1/25/93       30,000      $   2.8750      $ 5.0000      $ 2.8750      3.85
                                                     1/25/93       40,000      $   2.8750      $ 4.5000      $ 2.8750      3.89
                                                                                                                       
William C. Smith                                     4/16/97       80,000      $  10.2500      $20.2500      $10.2500      9.66
    Vice President, Finance and CFO                                                                                    
                                                                                                                       
Karen D. Auerbach                                       --           --              --            --            --          --
    Vice President & Genral Manager                                                                                    
    Design Automation Solutions                                                                                        
                                                                                                                       
Other Current Executive Officers:                                                                                      
                                                                                                                       
David Stepner                                        4/21/97       25,000      $  10.5000      $24.0000      $10.5000      8.99
    Vice President, Research & Development                                                                             
                                                                                                                       
Former Executive Officers:                                                                                             
                                                                                                                       
Gregory S. Olson                                     4/17/97      100,000      $   8.7500      $26.5000      $ 8.7500      9.26
    Vice President, Marketing                                                                                          
                                                                                                                       
Andrew J. Pease                                      4/17/97       35,000      $   8.7500      $26.5000      $ 8.7500      9.19
    Vice President, North American Sales                                                                               
                                                                                                                       
Tony Tolani                                          4/17/97       10,000      $   8.7500      $24.0000      $ 8.7500      8.99
    Vice President, Far East Operations                                                                                
                                                                                                                       
Fred E. Tubb                                         4/16/97        5,000      $  10.2500      $24.0000      $10.2500      8.99
    Vice President, Applied Solutions Dept           4/16/97       15,000      $  10.2500      $18.2500      $10.2500      9.58
                                                                                                                       
Robert M. Dressler                                   1/25/93       30,000      $   2.8750      $ 7.2500      $ 2.8750      4.07
    Vice President, Advanced Systems Group           1/25/93       10,000      $   2.8750      $ 5.5650      $ 2.8750      5.11
                                                                                                                       
Andrew R. Mills                                      1/25/93       15,000      $   2.8750      $ 5.2500      $ 2.8750      3.85
    Vice President, Design Automation Group                                                                            


                                     - 14 -


Fiscal 1998 Chief Executive Officer Compensation

         In March  1997,  the  Committee  established  a base salary for Mr. St.
Charles for fiscal year 1998.  This base salary  represented a decrease over Mr.
St.  Charles'  fiscal year 1997 base salary.  The  Compensation  Committee  also
established a target bonus for Mr. St.  Charles under the fiscal year 1998 bonus
plan.  The fiscal year 1997 base salary level and target bonus were based upon a
number of factors,  including (a) the Compensation Committee's assessment of the
fiscal year 1997 performance of the Company and Mr. St. Charles, (b) fiscal year
1998 Company performance  objectives and individual  performance  objectives and
responsibilities  for Mr. St.  Charles  established  in March 1997,  and (c) the
market  compensation  data for  companies in the same  industry  and  geographic
location  and  similar  in  size to the  Company  in  terms  of  revenue.  These
objectives  included  satisfactorily  managing the Company's  overall  corporate
business plan, such as meeting the Company's  profitability  projections and the
Company's sales targets, and strengthening the Company's financial position.

         In fiscal year 1998, the Compensation Committee granted Mr. St. Charles
a new stock option to purchase 160,000 shares.  The number of shares granted was
based on Mr. St. Charles'  position,  fiscal year 1997  performance and expected
performance in fiscal year 1998 and beyond.

         The  Compensation   Committee  has  concluded  that  Mr.  St.  Charles'
performance in fiscal year 1998 warrants the  compensation  for fiscal year 1998
as reflected in the Summary Compensation Table.

Compliance with Section 162(m) of the Internal Revenue Code of 1986.

         The Company  intends to comply with the  requirements of Section 162(m)
of the Internal  Revenue Code of 1986 for 1998. The Company does not expect cash
compensation for 1998 to be in excess of $1,000,000 or consequently  affected by
the requirements of Section 162(m).

                                                         COMPENSATION COMMITTEE

                                                         John C. Bolger
                                                         Thomas Kailath
                                                         Richard Murphy


                                      -15-


                      COMPANY STOCK PRICE PERFORMANCE GRAPH

         The  stock   price   performance   graph  below  shall  not  be  deemed
incorporated by reference by any general  statement  incorporating  by reference
this  Proxy  Statement  into any filing  under the  Securities  Act of 1933,  as
amended, or under the Securities Exchange Act of 1934, as amended, except to the
extent the Company specifically  incorporates this information by reference, and
shall not otherwise be deemed soliciting material or filed under such Acts.

         The graph below compares the cumulative total shareholder return of the
Common  Stock of the Company  from March 1, 1993 to  February  28, 1998 with the
cumulative  total return of the Nasdaq Composite Index and the Hambrecht & Quist
Technology  Index over the same period  (assuming the  investment of $100 in the
Company's  Common Stock and in each of the other  indices on March 1, 1993,  and
reinvestment of all dividends).

         The comparisons in the graph below are based on historical data and are
not intended to forecast the possible future performance of the Company's Common
Stock.


[The following  descriptive  data is supplied in accordance  with Rule 304(d) of
Regulation S-T]


                                                                  Cumulative Total Return
                         -----------------------------------------------------------------------------------------------------------
                         2/28/93   8/30/93   2/28/94   8/31/94   2/28/95   8/31/95   2/28/96   8/31/96   2/28/97   8/31/97   2/28/98
                         -----------------------------------------------------------------------------------------------------------
                                                                                              
NASDAQ Composite Index     100       111       117       114       118       152       165       210       195       236       264
H&Q Technology Index       100       103       118       120       137       193       205       221       269       352       368
Integrated Systems, Inc.   100       135       185       200       331       450       723      1023       700       465       525


                              CERTAIN TRANSACTIONS

         Since  March 1,  1997,  there  has not  been,  nor is  there  currently
proposed, any transaction or series of similar transactions to which the Company
was or is to be party in which the amount involved  exceeds $60,000 and in which
any  director,  executive  officer  or holder  of more than 5% of the  Company's
Common Stock had or will have a direct or indirect  material interest other than
(i)  compensation  arrangements,  which are  described  under  "Proposal No, 1 -
Election of Directors - Directors Compensation" and "Executive Compensation" and
(ii) the transaction described below.

         During fiscal year 1998,  Digital Link Corporation  purchased  products
and services totaling approximately $80,000 from the Company. These transactions
were made on terms  substantially  similar to those the Company  offers to other
customers.  Dr.  Gupta,  the Chairman of the Board of Directors and Secretary of
the  Company,  served as a member  of the Board of  Directors  of  Digital  Link
Corporation.  Mrs.  Gupta,  who is a director  of the Company and the spouse Dr.
Gupta, is the Chairperson of the Board of Directors of Digital Link Corporation.
Dr.  and  Mrs.  Gupta  are more  than  10%  shareholders  of both  Digital  Link
Corporation and the Company.


                                      -16-


             SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

         Section  16(a) of the  Securities  Exchange  Act of 1934  requires  the
Company's directors and executive officers, and persons who own more than 10% of
the Company's  Common Stock,  to file with the SEC initial reports of beneficial
ownership and reports of changes in beneficial  ownership of Common Stock of the
Company.  Officers,  directors and greater than 10% shareholders are required by
SEC  regulations  to furnish the Company with copies of all Section  16(a) forms
they file.

         Based solely on a review of the copies of such reports furnished to the
Company and written representations from the executive officers and directors of
the Company,  the Company  believes that all Section  16(a) filing  requirements
were  complied  with  during  fiscal  year 1998,  except as  follows:  David St.
Charles,  President and Chief Executive Officer,  filed late one report covering
five transactions.

                              SHAREHOLDER PROPOSALS

         Shareholder  proposals for inclusion in the Company's  Proxy  Statement
and form of proxy relating to the Company's 1999 Annual Meeting of  Shareholders
must be received by February 16, 1999.

                                 OTHER BUSINESS

         The Board does not presently  intend to bring any other business before
the Meeting  and, so far as is known to the Board,  no matters are to be brought
before the Meeting  except as specified in the Notice of the Meeting.  As to any
business that may properly come before the Meeting, however, it is intended that
proxies in the form  accompanying  this Proxy Statement will be voted in respect
thereof in accordance with the judgment of the persons voting such proxies.


                                             By Order of the Board of Directors

                                             /s/ NARENDRA K. GUPTA

                                             Narendra K. Gupta
                                             Chairman of the Board


================================================================================
ALL SHAREHOLDERS ARE URGED TO COMPLETE, SIGN AND DATE THE ACCOMPANYING PROXY AND
                RETURN IT IN THE ENCLOSED POSTAGE-PAID ENVELOPE.
================================================================================


                                      -17-


                                                                      APPENDIX A



 
                            INTEGRATED SYSTEMS, INC.

                           1998 EQUITY INCENTIVE PLAN

                            As Adopted March 30, 1998


               1. PURPOSE.  The purpose of this Plan is to provide incentives to
attract,  retain and  motivate  eligible  persons  whose  present and  potential
contributions  are  important  to the  success  of the  Company,  its Parent and
Subsidiaries,  by offering them an  opportunity  to participate in the Company's
future  performance  through  awards  of  Options,  Restricted  Stock  and Stock
Bonuses. Capitalized terms not defined in the text are defined in Section 23.

               2. SHARES SUBJECT TO THE PLAN.

                  2.1 Number of Shares  Available.  Subject to Sections  2.2 and
18, the total  number of Shares  reserved and  available  for grant and issuance
pursuant to this Plan will be 1,000,000  Shares plus (a) any  authorized  shares
not issued or subject  to  outstanding  grants  under the  Company's  1988 Stock
Option Plan the ("Prior  Plan") on the Effective  Date (as defined in Section 19
below);  (b) shares  that are  subject to  issuance  upon  exercise of an option
granted  under the Prior  Plan but cease to be  subject  to such  option for any
reason other than exercise of such option; and (c) shares that were issued under
the Prior Plan which are  repurchased by the Company at the original issue price
or  forfeited.  Subject to Sections 2.2 and 18,  Shares that are subject to: (x)
issuance  upon  exercise of an Option but cease to be subject to such Option for
any reason other than exercise of such Option;  (y) an Award  granted  hereunder
but are forfeited or are repurchased by the Company at the original issue price;
and (z) an Award that otherwise  terminates  without  Shares being issued,  will
again be available for grant and issuance in connection with future Awards under
this  Plan.  At all  times  the  Company  shall  reserve  and keep  available  a
sufficient  number of Shares as shall be required to satisfy the requirements of
all outstanding  Options  granted under this Plan and all other  outstanding but
unvested Awards granted under this Plan.

                  2.2  Adjustment  of  Shares.  In the event  that the number of
outstanding  shares is  changed  by a stock  dividend,  recapitalization,  stock
split,  reverse  stock  split,  subdivision,  combination,  reclassification  or
similar change in the capital  structure of the Company  without  consideration,
then (a) the number of Shares  reserved  for issuance  under this Plan,  (b) the
Exercise Prices of and number of Shares subject to outstanding  Options, and (c)
the number of Shares subject to other outstanding Awards will be proportionately
adjusted, subject to any required action by the Board or the stockholders of the
Company and compliance with applicable securities laws; provided,  however, that
fractions  of a Share will not be issued but will  either be  replaced by a cash
payment  equal to the Fair Market  Value of such  fraction of a Share or will be
rounded up to the nearest whole Share, as determined by the Committee.

               3.  ELIGIBILITY.  ISOs (as  defined  in  Section 5 below)  may be
granted  only to  employees  (including  officers  and  directors  who are  also
employees) of the Company or of a Parent or Subsidiary of the Company. All other
Awards  may  be  granted  to  employees,   officers,   directors,   consultants,
independent  contractors and advisors of the Company or any Parent or Subsidiary
of the Company; provided such consultants,  contractors and advisors render bona
fide  services  not in  connection  with the offer and sale of  securities  in a
capital-raising  transaction.  No person will be  eligible to receive  more than
200,000  Shares in any  calendar  year under this Plan  pursuant to the grant of
Awards  hereunder,  other than new  employees  of the  Company or of a Parent or
Subsidiary  of the Company  (including  new  employees who are also officers and
directors of the Company or any Parent or Subsidiary  of the  Company),  who are
eligible to receive up to a maximum of 1,000,000  Shares in the calendar year in
which they  commence  their  employment.  A person may be granted  more than one
Award under this Plan.

               4. ADMINISTRATION.

                  4.1 Committee Authority. This Plan will be administered by the
Committee  or by the  Board  acting as the  Committee.  Subject  to the  general
purposes,  terms and conditions of this Plan, and to the direction of the Board,
the Committee will have full power to implement and carry out this Plan. Without



limitation, the Committee will have the authority to:

              (a) construe and interpret this Plan, any Award  Agreement and any
                  other agreement or document executed pursuant to this Plan;

              (b) prescribe, amend and rescind rules and regulations relating to
                  this Plan or any Award;

              (c) select persons to receive Awards;

              (d) determine the form and terms of Awards;

              (e) determine the number of Shares or other consideration  subject
                  to Awards;

              (f) determine   whether   Awards  will  be  granted   singly,   in
                  combination  with,  in tandem with, in  replacement  of, or as
                  alternatives  to,  other  Awards  under this Plan or any other
                  incentive or compensation plan of the Company or any Parent or
                  Subsidiary of the Company;

              (g) grant waivers of Plan or Award conditions;

              (h) determine the vesting, exercisability and payment of Awards;

              (i) correct  any defect,  supply any  omission  or  reconcile  any
                  inconsistency in this Plan, any Award or any Award Agreement;

              (j) determine whether an Award has been earned; and

              (k) make all other  determinations  necessary or advisable for the
                  administration of this Plan.

                  4.2  Committee  Discretion.  Any  determination  made  by  the
Committee  with respect to any Award will be made in its sole  discretion at the
time of grant of the Award or,  unless in  contravention  of any express term of
this Plan or Award, at any later time, and such  determination will be final and
binding on the Company and on all persons  having an interest in any Award under
this Plan. The Committee may delegate to one or more officers of the Company the
authority to grant an Award under this Plan to Participants who are not Insiders
of the Company.

               5. OPTIONS.  The Committee may grant Options to eligible  persons
and will determine  whether such Options will be Incentive  Stock Options within
the meaning of the Code ("ISO") or  Nonqualified  Stock Options  ("NQSOs"),  the
number of Shares subject to the Option,  the Exercise  Price of the Option,  the
period  during  which the  Option  may be  exercised,  and all  other  terms and
conditions of the Option, subject to the following:

                  5.1 Form of Option Grant.  Each Option granted under this Plan
will be evidenced by an Award Agreement which will expressly identify the Option
as an ISO or an NQSO ("Stock  Option  Agreement"),  and will be in such form and
contain such provisions (which need not be the same for each Participant) as the
Committee  may from time to time  approve,  and which  will  comply  with and be
subject to the terms and conditions of this Plan.

                  5.2 Date of Grant.  The date of grant of an Option will be the
date on which the Committee makes the determination to grant such Option, unless
otherwise  specified by the Committee.  The Stock Option Agreement and a copy of
this Plan will be delivered to the  Participant  within a reasonable  time after
the granting of the Option.

                  5.3 Exercise  Period.  Options may be  exercisable  within the
times or upon the events  

- -2-

                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

determined by the Committee as set forth in the Stock Option Agreement governing
such Option;  provided,  however,  that no Option will be exercisable  after the
expiration  of ten (10) years from the date the Option is granted;  and provided
further that no ISO granted to a person who directly or by attribution owns more
than ten  percent  (10%) of the total  combined  voting  power of all classes of
stock of the Company or of any Parent or Subsidiary of the Company ("Ten Percent
Stockholder")  will be  exercisable  after the expiration of five (5) years from
the date the ISO is  granted.  The  Committee  also may  provide  for Options to
become exercisable at one time or from time to time,  periodically or otherwise,
in such number of Shares or percentage of Shares as the Committee determines.

                  5.4 Exercise  Price.  The Exercise  Price of an Option will be
determined by the Committee  when the Option is granted and may be not less than
85% of the Fair Market Value of the Shares on the date of grant;  provided that:
(i) the  Exercise  Price of an ISO will be not less than 100% of the Fair Market
Value of the Shares on the date of grant; and (ii) the Exercise Price of any ISO
granted  to a Ten  Percent  Stockholder  will not be less  than 110% of the Fair
Market  Value  of the  Shares  on the  date of  grant.  Payment  for the  Shares
purchased may be made in accordance with Section 8 of this Plan.

                  5.5  Method of  Exercise.  Options  may be  exercised  only by
delivery  to the  Company of a written  stock  option  exercise  agreement  (the
"Exercise Agreement") in a form approved by the Committee (which need not be the
same for each  Participant),  stating the number of Shares being purchased,  the
restrictions  imposed on the Shares purchased under such Exercise Agreement,  if
any, and such representations and agreements regarding Participant's  investment
intent and access to information  and other matters,  if any, as may be required
or desirable by the Company to comply with applicable  securities laws, together
with  payment  in full of the  Exercise  Price for the  number  of Shares  being
purchased.

                  5.6  Termination.  Notwithstanding  the  exercise  periods set
forth in the  Stock  Option  Agreement,  exercise  of an Option  will  always be
subject to the following:

              (a) If the  Participant  is Terminated for any reason except death
                  or  Disability,   then  the   Participant  may  exercise  such
                  Participant's  Options  only to the extent  that such  Options
                  would have been exercisable upon the Termination Date no later
                  than  three (3)  months  after the  Termination  Date (or such
                  shorter or longer time period not exceeding  five (5) years as
                  may be determined by the Committee,  with any exercise  beyond
                  three (3) months  after the  Termination  Date deemed to be an
                  NQSO),  but in any event, no later than the expiration date of
                  the Options.

              (b) If the  Participant  is  Terminated  because of  Participant's
                  death or Disability (or the Participant  dies within three (3)
                  months after a Termination  other than for Cause or because of
                  Participant's  Disability),  then Participant's Options may be
                  exercised only to the extent that such Options would have been
                  exercisable by Participant on the Termination Date and must be
                  exercised   by    Participant    (or    Participant's    legal
                  representative  or  authorized  assignee) no later than twelve
                  (12) months  after the  Termination  Date (or such  shorter or
                  longer  time  period  not  exceeding  five (5) years as may be
                  determined by the Committee, with any such exercise beyond (a)
                  three  (3)  months  after  the   Termination   Date  when  the
                  Termination  is for any reason  other  than the  Participant's
                  death or  Disability,  or (b)  twelve  (12)  months  after the
                  Termination  Date when the  Termination  is for  Participant's
                  death or Disability,  deemed to be an NQSO),  but in any event
                  no later than the expiration date of the Options.

              (c) Notwithstanding the provisions in paragraph 5.6(a) above, if a
                  Participant is terminated for Cause,  neither the Participant,
                  the  Participant's  estate nor such other  person who may then
                  hold the Option  shall be entitled to exercise any Option with
                  respect  to  any  Shares  whatsoever,   after  termination  of
                  service,  whether  or not after  termination  of  service  the
                  Participant may receive payment from the Company or Subsidiary
                  for vacation pay, for

- -3-

                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

                  services rendered prior to termination,  for services rendered
                  for the day on which termination occurs, for salary in lieu of
                  notice,   or  for  any  other   benefits.   In   making   such
                  determination,   the  Board  shall  give  the  Participant  an
                  opportunity  to present to the Board  evidence  on his behalf.
                  For the  purpose  of this  paragraph,  termination  of service
                  shall  be  deemed  to  occur  on the  date  when  the  Company
                  dispatches  notice  or  advice  to the  Participant  that  his
                  service is terminated.

                  5.7  Limitations  on  Exercise.  The  Committee  may specify a
reasonable  minimum number of Shares that may be purchased on any exercise of an
Option,  provided  that such minimum  number will not prevent  Participant  from
exercising  the  Option  for the full  number  of  Shares  for  which it is then
exercisable.

                  5.8  Limitations  on ISO.  The  aggregate  Fair  Market  Value
(determined  as of the date of grant) of Shares  with  respect  to which ISO are
exercisable for the first time by a Participant  during any calendar year (under
this Plan or under any other incentive stock option plan of the Company,  Parent
or Subsidiary of the Company) will not exceed $100,000. If the Fair Market Value
of Shares on the date of grant with respect to which ISO are exercisable for the
first time by a Participant during any calendar year exceeds $100,000,  then the
Options for the first  $100,000  worth of Shares to become  exercisable  in such
calendar  year will be ISO and the  Options for the amount in excess of $100,000
that become  exercisable in that calendar year will be NQSOs.  In the event that
the  Code or the  regulations  promulgated  thereunder  are  amended  after  the
Effective Date of this Plan to provide for a different  limit on the Fair Market
Value of Shares  permitted to be subject to ISO,  such  different  limit will be
automatically  incorporated  herein and will apply to any Options  granted after
the effective date of such amendment.

                  5.9  Modification,  Extension or Renewal.  The  Committee  may
modify,  extend or renew  outstanding  Options  and  authorize  the grant of new
Options in substitution therefor, provided that any such action may not, without
the written consent of a Participant,  impair any of such  Participant's  rights
under any Option  previously  granted.  Any  outstanding  ISO that is  modified,
extended,  renewed or  otherwise  altered  will be treated  in  accordance  with
Section  424(h) of the Code.  The  Committee  may reduce the  Exercise  Price of
outstanding  Options without the consent of  Participants  affected by a written
notice to them;  provided,  however,  that the Exercise Price may not be reduced
below the minimum  Exercise  Price that would be permitted  under Section 5.4 of
this Plan for  Options  granted  on the date the  action is taken to reduce  the
Exercise Price.

                  5.10 No Disqualification.  Notwithstanding any other provision
in this Plan, no term of this Plan relating to ISO will be interpreted,  amended
or altered,  nor will any  discretion  or authority  granted  under this Plan be
exercised,  so as to  disqualify  this Plan  under  Section  422 of the Code or,
without the consent of the  Participant  affected,  to disqualify  any ISO under
Section 422 of the Code.

               6. RESTRICTED  STOCK. A Restricted Stock Award is an offer by the
Company to sell to an eligible  person Shares that are subject to  restrictions.
The Committee will determine to whom an offer will be made, the number of Shares
the  person  may  purchase,  the price to be paid (the  "Purchase  Price"),  the
restrictions  to which the  Shares  will be  subject,  and all  other  terms and
conditions of the Restricted Stock Award, subject to the following:

                  6.1 Form of  Restricted  Stock Award.  All  purchases  under a
Restricted  Stock Award made pursuant to this Plan will be evidenced by an Award
Agreement  ("Restricted  Stock  Purchase  Agreement")  that will be in such form
(which need not be the same for each  Participant)  as the  Committee  will from
time to time  approve,  and will  comply  with and be  subject  to the terms and
conditions of this Plan.  The offer of Restricted  Stock will be accepted by the
Participant's  execution and delivery of the Restricted Stock Purchase Agreement
and full payment for the Shares to the Company  within thirty (30) days from the
date the Restricted Stock Purchase Agreement is delivered to the person. If such
person does not execute and deliver  the  Restricted  Stock  Purchase  Agreement
along with full payment for the Shares to the Company  within  thirty (30) days,
then the offer will terminate, unless otherwise determined by the Committee.

                  6.2 Purchase Price. The Purchase Price of Shares sold pursuant
to a Restricted  Stock

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                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

Award will be determined by the Committee on the date the Restricted Stock Award
is granted, except in the case of a sale to a Ten Percent Stockholder,  in which
case the Purchase  Price will be 100% of the Fair Market  Value.  Payment of the
Purchase Price may be made in accordance with Section 8 of this Plan.

                  6.3 Terms of Restricted Stock Awards.  Restricted Stock Awards
shall be  subject  to such  restrictions  as the  Committee  may  impose.  These
restrictions  may be based upon  completion  of a  specified  number of years of
service with the Company or upon completion of the performance  goals as set out
in advance in the Participant's  individual Restricted Stock Purchase Agreement.
Restricted  Stock Awards may vary from  Participant to  Participant  and between
groups of  Participants.  Prior to the grant of a Restricted  Stock  Award,  the
Committee  shall:  (a)  determine  the nature,  length and starting  date of any
Performance  Period for the  Restricted  Stock Award;  (b) select from among the
Performance  Factors to be used to measure  performance  goals,  if any; and (c)
determine the number of Shares that may be awarded to the Participant.  Prior to
the payment of any Restricted  Stock Award,  the Committee  shall  determine the
extent to which such Restricted Stock Award has been earned. Performance Periods
may overlap and  Participants  may  participate  simultaneously  with respect to
Restricted  Stock Awards that are subject to different  Performance  Periods and
having different performance goals and other criteria.

                  6.4 Termination During Performance Period. If a Participant is
Terminated  during a Performance  Period for any reason,  then such  Participant
will be entitled to payment (whether in Shares,  cash or otherwise) with respect
to the  Restricted  Stock  Award  only to the  extent  earned  as of the date of
Termination in accordance with the Restricted Stock Purchase  Agreement,  unless
the Committee will determine otherwise.

               7. STOCK BONUSES.

                  7.1  Awards  of Stock  Bonuses.  A Stock  Bonus is an award of
Shares  (which may consist of  Restricted  Stock) for  services  rendered to the
Company or any Parent or Subsidiary of the Company. A Stock Bonus may be awarded
for past services already  rendered to the Company,  or any Parent or Subsidiary
of the Company pursuant to an Award Agreement (the "Stock Bonus Agreement") that
will be in such form  (which need not be the same for each  Participant)  as the
Committee will from time to time approve, and will comply with and be subject to
the terms and  conditions  of this  Plan.  A Stock  Bonus  may be  awarded  upon
satisfaction  of  such  performance  goals  as are  set  out in  advance  in the
Participant's   individual  Award  Agreement  (the   "Performance   Stock  Bonus
Agreement")  that  will be in such  form  (which  need  not be the same for each
Participant)  as the Committee  will from time to time approve,  and will comply
with and be subject to the terms and conditions of this Plan.  Stock Bonuses may
vary from Participant to Participant and between groups of Participants, and may
be based  upon the  achievement  of the  Company,  Parent or  Subsidiary  and/or
individual  performance factors or upon such other criteria as the Committee may
determine.

                  7.2 Terms of Stock  Bonuses.  The Committee will determine the
number of Shares to be awarded to the  Participant.  If the Stock Bonus is being
earned upon the  satisfaction  of  performance  goals  pursuant to a Performance
Stock Bonus Agreement, then the Committee will: (a) determine the nature, length
and starting  date of any  Performance  Period for each Stock Bonus;  (b) select
from among the  Performance  Factors to be used to measure the  performance,  if
any;  and (c)  determine  the  number  of  Shares  that  may be  awarded  to the
Participant.  Prior to the  payment  of any Stock  Bonus,  the  Committee  shall
determine the extent to which such Stock  Bonuses have been earned.  Performance
Periods may overlap and Participants may participate simultaneously with respect
to Stock Bonuses that are subject to different Performance Periods and different
performance  goals and other criteria.  The number of Shares may be fixed or may
vary in accordance with such performance goals and criteria as may be determined
by the Committee.  The Committee may adjust the performance  goals applicable to
the Stock  Bonuses to take into  account  changes in law and  accounting  or tax
rules  and  to  make  such  adjustments  as the  Committee  deems  necessary  or
appropriate to reflect the impact of extraordinary  or unusual items,  events or
circumstances to avoid windfalls or hardships.

                  7.3 Form of Payment.  The earned  portion of a Stock Bonus may
be paid  currently  or on a  deferred  basis  with  such  interest  or  dividend
equivalent,  if any, as the Committee may determine.  Payment may be made in the
form of cash or whole  Shares  or a  combination  thereof,  either in a lump sum
payment or in 

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                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

installments, all as the Committee will determine.

               8. PAYMENT FOR SHARE PURCHASES.

                  8.1  Payment.  Payment for Shares  purchased  pursuant to this
Plan  may be made in cash  (by  check)  or,  where  expressly  approved  for the
Participant by the Committee and where permitted by law:

              (a) by   cancellation  of  indebtedness  of  the  Company  to  the
                  Participant;

              (b) by  surrender  of shares that  either:  (1) have been owned by
                  Participant  for more than six (6)  months  and have been paid
                  for within the  meaning of SEC Rule 144 (and,  if such  shares
                  were purchased  from the Company by use of a promissory  note,
                  such note has been fully paid with respect to such shares); or
                  (2) were obtained by Participant in the public market;

              (c) by tender of a full recourse promissory note having such terms
                  as may be approved by the Committee and bearing  interest at a
                  rate  sufficient to avoid  imputation of income under Sections
                  483 and 1274 of the Code; provided, however, that Participants
                  who are not  employees or directors of the Company will not be
                  entitled to purchase  Shares with a promissory note unless the
                  note is  adequately  secured  by  collateral  other  than  the
                  Shares;

              (d) by waiver of  compensation  due or accrued to the  Participant
                  for services rendered;

              (e) with respect only to purchases upon exercise of an Option, and
                  provided that a public market for the Company's stock exists:

                  (1)      through  a  "same  day  sale"   commitment  from  the
                           Participant and a  broker-dealer  that is a member of
                           the National  Association  of Securities  Dealers (an
                           "NASD Dealer")  whereby the  Participant  irrevocably
                           elects to  exercise  the Option and to sell a portion
                           of the Shares so  purchased  to pay for the  Exercise
                           Price,  and  whereby  the  NASD  Dealer   irrevocably
                           commits  upon  receipt of such  Shares to forward the
                           Exercise Price directly to the Company; or

                  (2)      through a "margin"  commitment  from the  Participant
                           and a NASD Dealer whereby the Participant irrevocably
                           elects to  exercise  the  Option  and to  pledge  the
                           Shares so  purchased  to the NASD  Dealer in a margin
                           account as  security  for a loan from the NASD Dealer
                           in the amount of the Exercise Price,  and whereby the
                           NASD Dealer irrevocably  commits upon receipt of such
                           Shares to forward the Exercise  Price directly to the
                           Company; or

              (f) by any combination of the foregoing.

                  8.2 Loan  Guarantees.  The Committee may help the  Participant
pay for Shares  purchased  under this Plan by  authorizing  a  guarantee  by the
Company of a third-party loan to the Participant.

               9. WITHHOLDING TAXES.

                  9.1 Withholding Generally. Whenever Shares are to be issued in
satisfaction  of Awards  granted  under this Plan,  the  Company may require the
Participant  to remit to the Company an amount  sufficient  to satisfy  federal,
state  and local  withholding  tax  requirements  prior to the  delivery  of any
certificate or certificates for such Shares. Whenever, under this Plan, payments
in satisfaction of Awards are to be made in cash, such payment will be net of an
amount  sufficient  to  satisfy  federal,   state,  and  local  withholding  tax
requirements.

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                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

                  9.2 Stock  Withholding.  When,  under  applicable  tax laws, a
Participant  incurs tax liability in connection  with the exercise or vesting of
any Award that is subject to tax withholding and the Participant is obligated to
pay the Company the amount  required to be withheld,  the  Committee  may in its
sole  discretion  allow the  Participant to satisfy the minimum  withholding tax
obligation by electing to have the Company withhold from the Shares to be issued
that  number of Shares  having a Fair Market  Value equal to the minimum  amount
required  to be  withheld,  determined  on the date that the amount of tax to be
withheld is to be  determined.  All  elections by a  Participant  to have Shares
withheld  for this  purpose  will be made in  accordance  with the  requirements
established  by the  Committee  and be in  writing in a form  acceptable  to the
Committee

              10. PRIVILEGES OF STOCK OWNERSHIP.

                  10.1 Voting and Dividends. No Participant will have any of the
rights of a  stockholder  with respect to any Shares until the Shares are issued
to the Participant.  After Shares are issued to the Participant, the Participant
will be a stockholder  and have all the rights of a stockholder  with respect to
such  Shares,  including  the right to vote and receive all  dividends  or other
distributions made or paid with respect to such Shares;  provided,  that if such
Shares are Restricted  Stock, then any new,  additional or different  securities
the  Participant  may become  entitled to receive with respect to such Shares by
virtue of a stock dividend,  stock split or any other change in the corporate or
capital structure of the Company will be subject to the same restrictions as the
Restricted Stock; provided,  further, that the Participant will have no right to
retain such stock dividends or stock  distributions  with respect to Shares that
are repurchased at the  Participant's  Purchase Price or Exercise Price pursuant
to Section 12.

                  10.2 Financial Statements.  The Company will provide financial
statements to each Participant  prior to such  Participant's  purchase of Shares
under this  Plan,  and to each  Participant  annually  during  the  period  such
Participant has Awards outstanding;  provided,  however, the Company will not be
required to provide such financial  statements to Participants whose services in
connection with the Company assure them access to equivalent information.

              11.  TRANSFERABILITY.  Awards  granted  under this  Plan,  and any
interest therein, will not be transferable or assignable by Participant, and may
not be made subject to execution,  attachment or similar process, otherwise than
by will or by the laws of  descent  and  distribution  or as  determined  by the
Committee and set forth in the Award  Agreement  with respect to Awards that are
not ISOs.  During the lifetime of the  Participant  an Award will be exercisable
only by the Participant,  and any elections with respect to an Award may be made
only by the  Participant  unless  otherwise  determined by the Committee and set
forth in the Award Agreement with respect to Awards that are not ISOs.

              12.  RESTRICTIONS  ON SHARES.  At the discretion of the Committee,
the Company may reserve to itself and/or its  assignee(s) in the Award Agreement
a right to repurchase a portion of or all Unvested  Shares held by a Participant
following  such  Participant's  Termination  at any time within ninety (90) days
after  the  later of  Participant's  Termination  Date and the date  Participant
purchases Shares under this Plan, for cash and/or cancellation of purchase money
indebtedness, at the Participant's Exercise Price or Purchase Price, as the case
may be.

              13. CERTIFICATES.  All certificates for Shares or other securities
delivered under this Plan will be subject to such stock transfer orders, legends
and  other  restrictions  as the  Committee  may deem  necessary  or  advisable,
including restrictions under any applicable federal, state or foreign securities
law, or any rules,  regulations  and other  requirements of the SEC or any stock
exchange or  automated  quotation  system upon which the Shares may be listed or
quoted.

              14. ESCROW;  PLEDGE OF SHARES.  To enforce any  restrictions  on a
Participant's  Shares,  the Committee may require the Participant to deposit all
certificates   representing   Shares,   together  with  stock  powers  or  other
instruments  of transfer  approved by the Committee,  appropriately  endorsed in
blank,  with the Company or an agent designated by the Company to hold in escrow
until such restrictions have lapsed or 

- -7-

                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

terminated,  and the  Committee may cause a legend or legends  referencing  such
restrictions to be placed on the certificates.  Any Participant who is permitted
to execute a promissory note as partial or full  consideration  for the purchase
of Shares  under  this Plan will be  required  to pledge  and  deposit  with the
Company  all or part of the  Shares so  purchased  as  collateral  to secure the
payment of  Participant's  obligation to the Company under the promissory  note;
provided,  however, that the Committee may require or accept other or additional
forms of collateral to secure the payment of such  obligation and, in any event,
the Company will have full recourse against the Participant under the promissory
note notwithstanding any pledge of the Participant's Shares or other collateral.
In  connection  with any pledge of the Shares,  Participant  will be required to
execute and deliver a written  pledge  agreement  in such form as the  Committee
will from time to time approve.  The Shares  purchased with the promissory  note
may be released  from the pledge on a pro rata basis as the  promissory  note is
paid.

              15. EXCHANGE AND BUYOUT OF AWARDS.  The Committee may, at any time
or from time to time, authorize the Company,  with the consent of the respective
Participants, to issue new Awards in exchange for the surrender and cancellation
of any or all  outstanding  Awards.  The  Committee  may at any  time buy from a
Participant an Award previously  granted with payment in cash, Shares (including
Restricted Stock) or other consideration,  based on such terms and conditions as
the Committee and the Participant may agree.

              16. SECURITIES LAW AND OTHER REGULATORY COMPLIANCE.  An Award will
not be effective unless such Award is in compliance with all applicable  federal
and state securities  laws, rules and regulations of any governmental  body, and
the requirements of any stock exchange or automated  quotation system upon which
the Shares  may then be listed or  quoted,  as they are in effect on the date of
grant  of the  Award  and  also  on the  date of  exercise  or  other  issuance.
Notwithstanding  any other  provision  in this Plan,  the  Company  will have no
obligation to issue or deliver certificates for Shares under this Plan prior to:
(a)  obtaining  any  approvals  from  governmental  agencies  that  the  Company
determines are necessary or advisable; and/or (b) completion of any registration
or other  qualification  of such Shares under any state or federal law or ruling
of any  governmental  body  that  the  Company  determines  to be  necessary  or
advisable.  The Company will be under no  obligation to register the Shares with
the SEC or to effect compliance with the registration,  qualification or listing
requirements of any state securities laws, stock exchange or automated quotation
system,  and the Company will have no liability  for any inability or failure to
do so.

              17. NO  OBLIGATION  TO  EMPLOY.  Nothing in this Plan or any Award
granted  under this Plan will  confer or be deemed to confer on any  Participant
any right to continue in the employ of, or to  continue  any other  relationship
with, the Company or any Parent or Subsidiary of the Company or limit in any way
the right of the Company or any Parent or Subsidiary of the Company to terminate
Participant's  employment  or other  relationship  at any time,  with or without
cause.

              18. CORPORATE TRANSACTIONS.

                  18.1 Assumption or Replacement of Awards by Successor.  In the
event of (a) a  dissolution  or  liquidation  of the  Company,  (b) a merger  or
consolidation in which the Company is not the surviving  corporation (other than
a merger or consolidation with a wholly-owned  subsidiary,  a reincorporation of
the Company in a different jurisdiction,  or other transaction in which there is
no substantial change in the stockholders of the Company or their relative stock
holdings  and the Awards  granted  under  this Plan are  assumed,  converted  or
replaced by the successor  corporation,  which assumption will be binding on all
Participants),  (c) a merger in which the Company is the  surviving  corporation
but after which the stockholders of the Company immediately prior to such merger
(other than any  stockholder  that  merges,  or which owns or  controls  another
corporation  that merges,  with the Company in such  merger)  cease to own their
shares or other equity  interest in the Company,  (d) the sale of  substantially
all of the assets of the Company,  or (e) the acquisition,  sale, or transfer of
more than 50% of the  outstanding  shares  of the  Company  by  tender  offer or
similar transaction,  any or all outstanding Awards may be assumed, converted or
replaced by the successor corporation (if any), which assumption,  conversion or
replacement  will  be  binding  on all  Participants.  In the  alternative,  the
successor  corporation may substitute equivalent Awards or provide substantially
similar  consideration  to Participants  as was provided to stockholders  (after
taking into account the existing  provisions  of the Awards).  In the event such
successor or acquiring corporation (if any) does not

- -8-

                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

assume, convert,  replace or substitute Awards, as provided above, pursuant to a
transaction  described  in this Section  18.1,  then  notwithstanding  any other
provision  in this  Plan to the  contrary,  the  vesting  of  such  Awards  will
accelerate  and  the  Options  will  become  exercisable  in full  prior  to the
consummation of such event at such times and on such conditions as the Committee
determines,  and if such Options are not exercised prior to the  consummation of
the  corporate  transaction,   they  shall  terminate  in  accordance  with  the
provisions of this Plan. The successor  corporation  may also issue, in place of
outstanding Shares of the Company held by the Participant, substantially similar
shares or other property subject to repurchase restrictions no less favorable to
the Participant.

                  The Committee  may, in its sole  discretion,  provide that the
vesting of any or all Awards granted  pursuant to this Plan will accelerate even
if Options would otherwise be assumed,  converted,  replaced or substituted for.
If the Committee exercises such discretion with respect to Options, such Options
will become  exercisable in full prior to the consummation of such event at such
time and on such conditions as the Committee determines, and if such Options are
not exercised prior to the consummation of the corporate transaction, they shall
terminate at such time as determined by the Committee.

                  18.2 Other Treatment of Awards.  Subject to any greater rights
granted to  Participants  under the foregoing  provisions of this Section 18, in
the event of the  occurrence of any  transaction  described in Section 18.1, any
outstanding  Awards will be treated as provided in the  applicable  agreement or
plan of merger, consolidation, dissolution, liquidation, or sale of assets.

                  18.3  Assumption of Awards by the Company.  The Company,  from
time to time,  also may  substitute  or assume  outstanding  awards  granted  by
another company, whether in connection with an acquisition of such other company
or otherwise,  by either;  (a) granting an Award under this Plan in substitution
of such other  company's  award;  or (b)  assuming  such award as if it had been
granted  under this Plan if the terms of such assumed  award could be applied to
an Award  granted  under this Plan.  Such  substitution  or  assumption  will be
permissible  if the holder of the  substituted  or assumed award would have been
eligible to be granted an Award under this Plan if the other company had applied
the rules of this Plan to such grant.  In the event the Company assumes an award
granted by another  company,  the terms and conditions of such award will remain
unchanged  (except that the  exercise  price and the number and nature of Shares
issuable  upon  exercise  of any  such  option  will be  adjusted  appropriately
pursuant  to Section  424(a) of the Code).  In the event the  Company  elects to
grant a new Option rather than assuming an existing option,  such new Option may
be granted with a similarly adjusted Exercise Price.

              19.  ADOPTION  AND  STOCKHOLDER  APPROVAL.  This Plan will  become
effective upon the  expiration  date of the Prior Plan (the  "Effective  Date").
This Plan shall be approved by the stockholders of the Company (excluding Shares
issued pursuant to this Plan),  consistent with applicable  laws,  within twelve
(12) months before or after the date this Plan is adopted by the Board. Upon the
Effective Date, the Committee may grant Awards pursuant to this Plan;  provided,
however,  that:  (a) no Option may be  exercised  prior to  initial  stockholder
approval  of this Plan;  (b) no Option  granted  pursuant  to an increase in the
number of Shares  subject to this Plan  approved by the Board will be  exercised
prior to the time such  increase has been  approved by the  stockholders  of the
Company;  and (c) in the event that stockholder approval of such increase is not
obtained within the time period provided herein,  all Awards granted pursuant to
such increase will be canceled,  any Shares issued pursuant to any Award granted
pursuant to such increase will be canceled,  and any purchase of Shares pursuant
to such increase will be rescinded.

              20. TERM OF  PLAN/GOVERNING  LAW.  Unless  earlier  terminated  as
provided herein, this Plan will terminate ten (10) years from the date this Plan
is adopted by the Board or, if earlier, the date of stockholder  approval.  This
Plan  and all  agreements  thereunder  shall be  governed  by and  construed  in
accordance with the laws of the State of California.

- -9-

                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

              21.  AMENDMENT OR  TERMINATION  OF PLAN. The Board may at any time
terminate  or amend  this  Plan in any  respect,  including  without  limitation
amendment of any form of Award  Agreement or instrument to be executed  pursuant
to this Plan; provided,  however,  that the Board will not, without the approval
of the stockholders of the Company,  amend this Plan in any manner that requires
such stockholder approval.

              22.  NONEXCLUSIVITY OF THE PLAN. Neither the adoption of this Plan
by the Board, the submission of this Plan to the stockholders of the Company for
approval,  nor any  provision  of this Plan will be  construed  as creating  any
limitations  on the power of the  Board to adopt  such  additional  compensation
arrangements  as it may  deem  desirable,  including,  without  limitation,  the
granting of stock options and bonuses  otherwise  than under this Plan, and such
arrangements may be either  generally  applicable or applicable only in specific
cases.

              23.  DEFINITIONS.  As used in this Plan, the following  terms will
have the following meanings:

                  "Award" means any award under this Plan, including any Option,
Restricted Stock or Stock Bonus.

                  "Award  Agreement"  means,  with  respect to each  Award,  the
signed written agreement  between the Company and the Participant  setting forth
the terms and conditions of the Award.

                  "Board" means the Board of Directors of the Company.

                  "Cause" means the commission of an act of theft, embezzlement,
fraud,  dishonesty  or a breach of fiduciary  duty to the Company or a Parent or
Subsidiary of the Company.

                  "Code" means the Internal Revenue Code of 1986, as amended.

                  "Committee" means the Compensation Committee of the Board.

                  "Company"  means  Integrated  Systems,  Inc. or any  successor
corporation.

                  "Disability"   means  a  disability,   whether   temporary  or
permanent, partial or total, as determined by the Committee.

                  "Exchange Act" means the  Securities  Exchange Act of 1934, as
amended.

                  "Exercise  Price"  means  the  price at  which a holder  of an
Option may purchase the Shares issuable upon exercise of the Option.

                  "Fair  Market  Value"  means,  as of any date,  the value of a
share of the Company's Common Stock determined as follows:

              (a) if such  Common  Stock is then  quoted on the Nasdaq  National
                  Market, its closing price on the Nasdaq National Market on the
                  date of determination as reported in The Wall Street Journal;

              (b) if such Common Stock is publicly  traded and is then listed on
                  a national securities exchange,  its closing price on the date
                  of determination on the principal national securities exchange
                  on which the Common  Stock is listed or admitted to trading as
                  reported in The Wall Street Journal;

              (c) if such Common  Stock is publicly  traded but is not quoted on
                  the Nasdaq  National  Market nor listed or admitted to trading
                  on a national securities exchange,  the average of the 

- -10-

                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

                  closing bid and asked prices on the date of  determination  as
                  reported in The Wall Street Journal;

              (d) in the case of an Award made on the Effective  Date, the price
                  per share at which  shares of the  Company's  Common Stock are
                  initially  offered  for sale to the  public  by the  Company's
                  underwriters  in the initial public  offering of the Company's
                  Common Stock pursuant to a registration  statement  filed with
                  the SEC under the Securities Act; or

              (d) if none of the  foregoing is  applicable,  by the Committee in
                  good faith.

                  "Insider"  means an officer or  director of the Company or any
other person whose  transactions  in the  Company's  Common Stock are subject to
Section 16 of the Exchange Act.

                  "Option"  means an  award  of an  option  to  purchase  Shares
pursuant to Section 5.

                  "Parent" means any corporation  (other than the Company) in an
unbroken  chain  of  corporations  ending  with  the  Company  if  each  of such
corporations  other than the Company  owns stock  possessing  50% or more of the
total  combined  voting  power  of all  classes  of  stock  in one of the  other
corporations in such chain.

                  "Participant"  means a person who receives an Award under this
Plan.

                  "Performance  Factors"  means  the  factors  selected  by  the
Committee from among the following measures to determine whether the performance
goals established by the Committee and applicable to Awards have been satisfied:

                  (a) Net revenue and/or net revenue growth;

                  (b) Earnings  before  income  taxes  and  amortization  and/or
                      earnings before income taxes and amortization growth;

                  (c) Operating income and/or operating income growth;

                  (d) Net income and/or net income growth;

                  (e) Earnings per share and/or earnings per share growth;

                  (f) Total shareholder  return and/or total shareholder  return
                      growth;

                  (g) Return on equity;

                  (h) Operating cash flow return on income;

                  (i) Adjusted operating cash flow return on income;

                  (j) Economic value added; and

                  (k) Individual confidential business objectives.

                  "Performance Period" means the period of service determined by
the  Committee,  not to exceed  five  years,  during  which  years of service or
performance is to be measured for Restricted Stock Awards or Stock Bonuses.

- -11-


                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

                  "Plan"  means  this  Integrated  Systems,   Inc.  1998  Equity
Incentive Plan, as amended from time to time.

                  "Restricted  Stock Award" means an award of Shares pursuant to
Section 6.

                  "SEC" means the Securities and Exchange Commission.

                  "Securities Act" means the Securities Act of 1933, as amended.

                  "Shares"  means shares of the Company's  Common Stock reserved
for issuance under this Plan, as adjusted pursuant to Sections 2 and 18, and any
successor security.

                  "Stock  Bonus"  means an award of  Shares,  or cash in lieu of
Shares, pursuant to Section 7.

                  "Subsidiary" means any corporation (other than the Company) in
an  unbroken  chain of  corporations  beginning  with the Company if each of the
corporations  other than the last  corporation  in the unbroken chain owns stock
possessing  50% or more of the total  combined  voting  power of all  classes of
stock in one of the other corporations in such chain.

                  "Termination" or "Terminated" means, for purposes of this Plan
with respect to a Participant, that the Participant has for any reason ceased to
provide  services as an employee,  officer,  director,  consultant,  independent
contractor,  or advisor to the Company or a Parent or Subsidiary of the Company.
An employee will not be deemed to have ceased to provide services in the case of
(i) sick  leave,  (ii)  military  leave,  or (iii)  any other  leave of  absence
approved by the Committee, provided, that such leave is for a period of not more
than  90  days,  unless  reemployment  upon  the  expiration  of such  leave  is
guaranteed  by  contract  or statute or unless  provided  otherwise  pursuant to
formal  policy  adopted  from  time  to  time  by the  Company  and  issued  and
promulgated to employees in writing.  In the case of any employee on an approved
leave of absence, the Committee may make such provisions  respecting  suspension
of  vesting  of the Award  while on leave  from the  employ of the  Company or a
Subsidiary as it may deem appropriate,  except that in no event may an Option be
exercised  after the  expiration of the term set forth in the Option  agreement.
The Committee will have sole  discretion to determine  whether a Participant has
ceased to  provide  services  and the  effective  date on which the  Participant
ceased to provide services (the "Termination Date").

                  "Unvested  Shares" means  "Unvested  Shares" as defined in the
Award Agreement.

                  "Vested  Shares" means "Vested Shares" as defined in the Award
Agreement.

- -12-



                                                                      APPENDIX B


                            [INTEGRATED SYSTEMS LOGO]

                            Integrated Systems, Inc.

                        1994 Directors Stock Option Plan

                            As Adopted March 23, 1994

         1.  Purpose.  This Stock Option Plan (this  "Plan") is  established  to
provide equity  incentives for nonemployee  members of the Board of Directors of
Integrated Systems, Inc. (the "Company") who are described in Section 6.1 below,
by granting such persons options to purchase shares of stock of the Company.

         2. Adoption and Shareholder Approval.  This Plan shall become effective
on the date (the "Effective  Date") that it is adopted by the Board of Directors
(the "Board") of the Company. This Plan shall be approved by the shareholders of
the Company,  consistent  with applicable  laws,  within twelve months after the
date that it is adopted by the Board.  After adoption of this Plan by the Board,
options  ("Options")  may be granted under this Plan provided that, in the event
that  shareholder  approval  is not  obtained  within the time  period  provided
herein, this Plan, and all Options granted hereunder, shall terminate. No Option
that is issued as a result of any increase in the number of shares authorized to
be issued under this Plan shall be exercised prior to the time such increase has
been approved by the  shareholders  of the Company and all such Options  granted
pursuant to such increase shall similarly terminate if such shareholder approval
is not  obtained.  So long as the  Company is  subject  to Section  16(b) of the
Securities  Exchange Act of 1934, as amended,  (the "Exchange  Act") the Company
will  comply with the  requirements  of Rule 16b-3 with  respect to  shareholder
approval.

         3. Types of Options and Shares.  Options  granted under this Plan shall
be  nonqualified  stock  options  ("NQSOs").  The  shares  of stock  that may be
purchased  upon exercise of Options  granted under this Plan (the  "Shares") are
shares of the Common Stock of the Company.

         4. Number of Shares.  The  maximum  number of Shares that may be issued
pursuant  to  Options  granted  under this Plan is  200,000  Shares,  subject to
adjustment as provided in this Plan. If any Option is terminated  for any reason
without being  exercised in whole or in part, the Shares  thereby  released from
such Option shall be available  for purchase  under other  Options  subsequently
granted under this Plan. At all times during the term of this Plan,  the Company
shall reserve and keep  available  such number of Shares as shall be required to
satisfy the requirements of outstanding Options under this Plan.

         5. Administration. This Plan shall be administered by the Board or by a
committee of not less than two members of the Board appointed to administer this
Plan (the "Committee").  As used in this Plan, references to the Committee shall
mean either such  Committee or the Board if no committee  has been  established.
The interpretation by the Committee of any of the provisions of this Plan or any
Option  granted  under this Plan shall be final and binding upon the Company and
all persons having an interest in any Option or any Shares purchased pursuant to
an Option.

         6. Eligibility and Award Formula.

                6.1 Eligibility. Options may be granted only to directors of the
Company  who are not  employees  of the  Company or any  Parent,  Subsidiary  or
Affiliate of the  Company,  as those terms are defined in Section 18 below (each
an "Optionee").




                6.2 Initial Grant. Each Optionee who is a member of the Board on
the Effective Date or becomes a member of the Board for the first time after the
Effective  Date and who has  previously  not been  granted  a stock  option as a
director,  will  automatically  be  granted an Option  for  15,000  shares  (the
"Initial  Grant") on the latter of the Effective  Date or the date such Optionee
first  joins the Board.  No other  member of the Board  will  receive an Initial
Grant.

                6.3  Succeeding  Grants.  If, after the Effective  Date, on each
anniversary  date of joining  the Board,  the  Optionee is still a member of the
Board,  the  Optionee  will again  automatically  be granted an Option for 5,000
Shares.


         7. Terms and  Conditions  of Options.  Subject to the  following and to
Section 6 above:

                7.1 Form of Option  Grant.  Each Option  granted under this Plan
shall be evidenced by a written Stock Option Grant ("Grant") in such form (which
need not be the same for each Optionee) as the Committee shall from time to time
approve,  which  Grant  shall  comply  with  and be  subject  to the  terms  and
conditions of this Plan.

                7.2  Vesting.  The  date of  automatic  grant  of an  Option  is
referred to in this Plan as the  respective  "Start  Date" for each such Option.
Each  Option  granted  under the Plan will vest as to 2.0833% of the Shares each
calendar month, so long as the Optionee  continuously  remains a director of the
Company.

                7.3 Exercise Price. The exercise price of an Option shall be the
Fair Market Value (as defined in Section  18.4) of the Shares,  at the time that
the Option is granted.

                7.4  Termination  of Option.  Except as  provided  below in this
Section,  each  Option  shall  expire  ten  years  after  the  Start  Date  (the
"Expiration  Date").  The Option shall cease to vest if Optionee  ceases to be a
member of the  Board.  The date on which  Optionee  ceases to be a member of the
Board shall be referred to as the "Termination Date." An Option may be exercised
after the Termination Date only as set forth below:

                      (a)  Termination  Generally.  If  Optionee  ceases to be a
member of the Board for any reason except death or disability,  each Option,  to
the  extent  (and only to the  extent)  that it would have been  exercisable  by
Optionee on the  Termination  Date, may be exercised by Optionee  within six (6)
months after the  Termination  Date,  but in no event later than the  Expiration
Date.

                      (b) Death or Disability. If Optionee ceases to be a member
of the Board  because of the death of  Optionee  or the  disability  of Optionee
within the meaning of Section  22(e)(3) of the Internal Revenue Code of 1986, as
amended,  each Option, to the extent (and only to the extent) that it would have
been  exercisable  by Optionee on the  Termination  Date,  may be  exercised  by
Optionee (or Optionee's  legal  representative)  within twelve (12) months after
the Termination Date, but in no event later than the Expiration Date.

         8. Exercise of Options.

                8.1  Notice.  Options may be  exercised  only by delivery to the
Company of an exercise  agreement in a form approved by the  Committee,  stating
the number of Shares being purchased, the restrictions imposed on the Shares and
such representations and agreements  regarding the Optionee's  investment intent
and access to  information  as may be  required  by the  Company to comply  with
applicable  securities laws, together with payment in full of the exercise price
for the number of Shares being purchased.

                8.2  Payment.  Payment for the Shares may be made (a) in cash or
by check;  (b) by  surrender  of shares of Common Stock of the Company that have
been owned by  Optionee  for more than six (6) months  (and which have been paid
for within the meaning of SEC Rule 144 and, if such shares were  purchased  from
the  Company  by use of a  promissory  note,  such note has been fully paid with
respect to such  shares) or were  obtained  by the  Optionee  in the open public
market,  having a Fair Market Value equal to the  exercise  price of the Option;
(c) by waiver of compensation due or accrued to Optionee for services  rendered;
(d) provided  that a public market for the  Company's  stock  exists,  through a
"same day sale"  commitment  from the  Optionee  and a  broker-dealer  that is a


                                      -2-


member of the  National  Association  of  Securities  Dealers (a "NASD  Dealer")
whereby the  Optionee  irrevocably  elects to exercise  the Option and to sell a
portion of the Shares so purchased to pay for the exercise price and whereby the
NASD  Dealer  irrevocably  commits  upon  receipt of such  Shares to forward the
exercise  price  directly to the Company;  (e) provided that a public market for
the Company's stock exists,  through a "margin" commitment from the Optionee and
a NASD Dealer whereby the Optionee irrevocably elects to exercise the Option and
to pledge  the Shares so  purchased  to the NASD  Dealer in a margin  account as
security  for a loan from the NASD Dealer in the amount of the  exercise  price,
and whereby the NASD Dealer  irrevocably  commits upon receipt of such Shares to
forward the exercise price directly to the Company; or (f) by any combination of
the foregoing.

                8.3  Withholding  Taxes.  Prior to  issuance  of the Shares upon
exercise of an Option, the Optionee shall pay or make adequate provision for any
federal or state withholding obligations of the Company, if applicable.

                8.4  Limitations  on  Exercise.   Notwithstanding  the  exercise
periods set forth in the Grant, exercise of an Option shall always be subject to
the following limitations:

                      (a) An Option shall not be exercisable  until such time as
the Plan or, in the case of Options  granted  pursuant  to an  amendment  to the
number of shares that may be issued pursuant to the Plan, the amendment has been
approved  by the  shareholders  of the  Company in  accordance  with  Section 16
hereof.

                      (b)  An  Option  shall  not  be  exercisable  unless  such
exercise is in  compliance  with the 1933  Securities  Act, as amended,  and all
applicable state securities laws, as they are in effect on the date of exercise.

                      (c) The Committee may specify a reasonable  minimum number
of Shares that may be purchased on any exercise of an Option, provided that such
minimum number will not prevent the Optionee from  exercising the full number of
Shares as to which the Option is then exercisable.

         9.  Nontransferability of Options. During the lifetime of the Optionee,
an  Option  shall  be  exercisable  only by the  Optionee  or by the  Optionee's
guardian or legal  representative,  unless otherwise permitted by the Committee.
No Option may be sold, pledged, assigned, hypothecated,  transferred or disposed
of in any manner other than by will or by the laws of descent and distribution.

         10. Privileges of Stock  Ownership.  No  Optionee shall have any of the
rights of a  shareholder  with respect to any Shares  subject to an Option until
the Option has been validly exercised. No adjustment shall be made for dividends
or  distributions or other rights for which the record date is prior to the date
of exercise,  except as provided in this Plan. The Company shall provide to each
Optionee a copy of the annual financial  statements of the Company, at such time
after the close of each fiscal  year of the Company as they are  released by the
Company to its shareholders.

         11.  Adjustment  of  Option  Shares.  In the event  that the  number of
outstanding  shares  of  Common  Stock  of the  Company  is  changed  by a stock
dividend,  stock split,  reverse stock split,  combination,  reclassification or
similar change in the capital  structure of the Company  without  consideration,
the number of Shares  available under this Plan and the number of Shares subject
to outstanding Options and the exercise price per share of such Options shall be
proportionately  adjusted,  subject  to any  required  action  by the  Board  or
shareholders  of the Company and compliance  with  applicable  securities  laws;
provided,  however, that no certificate or scrip representing  fractional shares
shall be issued upon  exercise of any Option and any  resulting  fractions  of a
Share shall be ignored.

         12. No Obligation to Employ. Nothing in this Plan or any Option granted
under this Plan shall confer on any Optionee any right to continue as a director
of the Company.

         13.  Compliance  With Laws.  The grant of Options  and the  issuance of
Shares upon  exercise of any Options  shall be subject to and  conditioned  upon
compliance with all applicable requirements of law, including without limitation
compliance  with  the  1933  Securities  Act,  any  required   approval  by  the
Commissioner  of  Corporations  of the State of California,  compliance with all
other  applicable  state securities laws and compliance with the requirements of
any stock exchange or national  market system on which the Shares may be listed.
The


                                      -3-


Company shall be under no obligation to register the Shares with the  Securities
and  Exchange  Commission  or to  effect  compliance  with the  registration  or
qualification  requirement  of any state  securities  laws,  stock  exchange  or
national market system.

         l4.  Restrictions  on Shares.  The Company may reserve to itself or its
assignee(s) in the Grant, a right to repurchase any or all unvested  shares held
by an Optionee upon the  Optionee's  termination of service with the Company for
any reason at the Optionee's original exercise price.

         15. Assumption of Options by Successors.  In the event of a dissolution
or  liquidation  of the  Company,  a merger  in  which  the  Company  is not the
surviving  corporation,  the  sale of  substantially  all of the  assets  of the
Company,  or any other transaction which qualifies as a "corporate  transaction"
under  Section 424 of the Revenue Code wherein the  Shareholders  of the Company
give up all of their equity interest in the Company,  the vesting of all options
granted  pursuant  to the Plan  will  accelerate  and the  options  will  become
exercisable in full prior to the consummation of such event at such times and on
such conditions as the Committee determines.

         16.  Amendment or  Termination  of Plan.  The Committee may at any time
terminate  or amend  this  Plan but not the  terms  of any  outstanding  option;
provided,  however,  that the Committee  shall not,  without the approval of the
shareholders of the Company, increase the total number of Shares available under
this Plan (except by operation of the  provisions of Sections 4 and 11 above) or
change the class of persons eligible to receive Options. Further, the provisions
in  Sections 6 and 7 of this Plan shall not be amended  more than once every six
(6) months,  other than to comport with changes in the Internal  Revenue Code of
1986,  as amended,  the  Employee  Retirement  Income  Security Act or the rules
thereunder. In any case, no amendment of this Plan may adversely affect any then
outstanding  Options or any  unexercised  portions  thereof  without the written
consent of the Optionee.

         17.  Term of Plan.  Options  may be granted  pursuant to this Plan from
time to time within a period of ten (10) years from the Effective Date.

         18.  Certain  Definitions.  As used in this Plan,  the following  terms
shall have the following meanings:

                18.1 "Parent" means any corporation  (other than the Company) in
an unbroken chain of corporations ending with the Company if, at the time of the
granting of the Option,  each of such  corporations  other than the Company owns
stock  possessing 50% or more of the total combined  voting power of all classes
of stock in one of the other corporations in such chain.

                18.2 "Subsidiary" means any corporation (other than the Company)
in an unbroken chain of corporations  beginning with the Company if, at the time
of  granting  of the  Option,  each of the  corporations  other  than  the  last
corporation in the unbroken chain owns stock possessing 50% or more of the total
combined  voting power of all classes of stock in one of the other  corporations
in such chain.

                18.3  "Affiliate"  means  any  corporation  that  directly,   or
indirectly through one or more intermediaries,  controls or is controlled by, or
is under common control with, another  corporation,  where "control"  (including
the terms "controlled by" and "under common control with") means the possession,
direct or indirect,  of the power to cause the direction of the  management  and
policies of the corporation, whether through the ownership of voting securities,
by contract or otherwise.

                18.4 "Fair  Market  Value"  shall be the  closing  price for the
common  stock  of the  Company  on the  last  trading  day  prior to the date of
determination  as quoted on the Nasdaq  National Market and reported in The Wall
Street Journal.


                                      -4-

                                                                      APPENDIX C
[GRAPHIC OMITTED]



PROXY                       INTEGRATED SYSTEMS, INC.                       PROXY

              PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
                    FOR THE ANNUAL MEETING OF SHAREHOLDERS
                          TO BE HELD ON JULY 15, 1998


         The undersigned hereby appoints Narendra K. Gupta and William C. Smith,
or either of them,  as proxies and  attorneys  in fact,  each with full power of
substitution, to represent the undersigned at the Annual Meeting of Shareholders
of  Integrated  Systems,  Inc. (the  "Company")  to be held at the Company,  201
Moffett Park Drive,  Sunnyvale,  CA 94089 on July 15, 1998 at 2:00 p.m., and any
adjournments  or  postponements  thereof,  and to vote the  number of shares the
undersigned would be entitled to vote if personally present at the meeting.


                 (Continued, and to be signed on the other side)



                                                                 [X] Please mark
                                                                      your votes
                                                                       as this

                                        WITHHOLD    
                                FOR     FOR ALL     
1. ELECTION OF DIRECTORS:                           
   NOMINEES: John C. Bolger,    [ ]       [ ]
   Michael A. Brochu,
   Narendra K. Gupta, Vinita Gupta, Thomas Kailath, 
   Richard C. Murphy, David P. St. Charles          

   INSTRUCTION:  To withhold  authority  to vote for
   any individual nominee, write that nominee's name
   in the space provided below.

   -------------------------------------------------

                                                           FOR  AGAINST  ABSTAIN
2. To approve the adoption of the 1998 Equity Incentive    [ ]    [ ]      [ ]
   Plan.
      
3. To approve the amendment to the 1994 Directors Stock    [ ]    [ ]      [ ]
   Option Plan.                                        
      
4. To ratify the  selection of Coopers & Lybrand LLP as    [ ]    [ ]      [ ]
   the Company's independent public accountants.       

                    MANAGEMENT  RECOMMENDS  A VOTE  FOR  ALL  THE  NOMINEES  FOR
                    DIRECTOR LISTED ABOVE AND A VOTE FOR PROPOSALS 2, 3 AND 4.

                    UNLESS A CONTRARY DIRECTION IS INDICATED, THIS PROXY WILL BE
                    VOTED  FOR  ALL  NOMINEES  LISTED  IN  PROPOSAL  1  AND  FOR
                    PROPOSALS 2, 3 AND 4 AS MORE  SPECIFICALLY  DESCRIBED IN THE
                    PROXY  STATEMENT.  IF SPECIFIC  INSTRUCTIONS  ARE INDICATED,
                    THIS PROXY WILL BE VOTED IN ACCORDANCE  THEREWITH.  In their
                    discretion,  the  proxies are  authorized  to vote upon such
                    other  business as may  properly  come before the meeting or
                    any  adjournment  or  postponement  thereof  to  the  extent
                    authorized by Rule 14a-4(c)  promulgated  by the  Securities
                    and Exchange Commission.

Signature(s) ______________________________________  Dated _______________, 1998
          
Sign exactly as your name(s) appear(s) on your stock  certificate.  If shares of
stock  stand of  record in the  names of two or more  persons  or in the name of
husband and wife,  whether as joint  tenants or  otherwise,  both or all of such
persons should sign the above Proxy.  If shares of stock are held of record by a
corporation, the Proxy should be executed by the President or Vice President and
the  Secretary or Assistant  Secretary.  Executors  or  administrators  or other
fiduciaries who execute the above Proxy for a deceased  Shareholder  should give
their full title. Please date the Proxy.

WHETHER OR NOT YOU PLAN TO ATTEND THE  MEETING IN PERSON,  YOU ARE URGED TO SIGN
AND  PROMPTLY  MAIL THIS PROXY IN THE RETURN  ENVELOPE SO THAT YOUR STOCK MAY BE
REPRESENTED AT THE MEETING.