INTEGRATED SYSTEMS, INC.

                           1998 EQUITY INCENTIVE PLAN

                            As Adopted March 30, 1998
                            As Amended March 24, 1999


              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 2,000,000 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




                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

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.

                                      -2-


                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

                   5.3  EXERCISE PERIOD. Options may be exercisable within the
times or upon the events 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


                                      -3-


                        Participant may receive payment from the Company or
                        Subsidiary for vacation pay, for 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.


                                      -4-


                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

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


                                      -5-


                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

                     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 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


                                      -6-


                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

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.

                     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.


                                      -7-


                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan

                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 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


                                      -8-


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 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


                                      -9-


stockholder approval. This Plan and all agreements thereunder shall be governed
by and construed in accordance with the laws of the State of California.

                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


                                      -10-


                         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 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.


                                      -11-


                         "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.

                         "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-




                                                                         No.____


                            INTEGRATED SYSTEMS, INC.

                           1998 EQUITY INCENTIVE PLAN

                             STOCK OPTION AGREEMENT


          This Stock Option Agreement (this "AGREEMENT") is made and entered
into as of the date of grant set forth below (the "DATE OF GRANT") by and
between Integrated Systems, Inc., a California corporation (the "COMPANY"), and
the participant named below ("PARTICIPANT"). Capitalized terms not defined
herein shall have the meaning ascribed to them in the Company's 1998 Equity
Incentive Plan (the "PLAN").

PARTICIPANT:
                                              ---------------------------------
SOCIAL SECURITY NUMBER:
                                              ---------------------------------
PARTICIPANT'S ADDRESS:
                                              ---------------------------------
TOTAL OPTION SHARES:
                                              ---------------------------------
EXERCISE PRICE PER SHARE:
                                              ---------------------------------
DATE OF GRANT:
                                              ---------------------------------
VESTING START DATE:
                                              ---------------------------------
EXPIRATION DATE:
                                              ---------------------------------
TYPE OF STOCK OPTION
(CHECK ONE):                                  [ ] INCENTIVE STOCK OPTION
                                              [ ] NONQUALIFIED STOCK OPTION

                1. GRANT OF OPTION. The Company hereby grants to Participant an
option (this "OPTION") to purchase up to the total number of shares of Common
Stock of the Company set forth above (collectively, the "SHARES") at the
Exercise Price Per Share set forth above (the "EXERCISE PRICE"), subject to all
of the terms and conditions of this Agreement and the Plan. If designated as an
Incentive Stock Option above, this Option is intended to qualify as an
"incentive stock option" ("ISO") within the meaning of Section 422 of the
Internal Revenue Code of 1986, as amended (the "CODE").

                2. VESTING; EXERCISE PERIOD.

                   2.1  VESTING OF RIGHT TO EXERCISE OPTION.  This Option
shall become exercisable as to portions of the Shares as follows: (a) this
Option shall not be exercisable with respect to any of the Shares until
_____________, 199_ (the "FIRST VESTING DATE"); (b) on the First Vesting Date
this Option shall become exercisable as to 25%of the Shares, if Participant
has continuously provided services to the Company or any Subsidiary or Parent
of the Company



                                                         Stock Option Agreement

from the Date of Grant through the First Vesting Date and has
not been Terminated on or before the First Vesting Date; and (c) this Option
shall become exercisable as to an additional 2.083% of the Shares upon the
expiration of each successive full month after the First Vesting Date, so
long as Participant continuously provides services to the Company or any
Subsidiary or Parent of the Company and is not Terminated; PROVIDED that this
Option shall in no event ever become exercisable with respect to more than
100% of the Shares.

                   2.2  EXPIRATION.  This Option shall expire on the Expiration
Date set forth above and must be exercised, if at all, on or before the earlier
of the Expiration Date or the date on which this Option is earlier terminated in
accordance with the provisions of Section 3.

                3. TERMINATION.

                   3.1  TERMINATION FOR ANY REASON EXCEPT DEATH, DISABILITY OR
CAUSE. If Participant is Terminated for any reason, except Participant's death,
Disability or Cause, then this Option, to the extent (and only to the extent)
that it would have been exercisable by Participant on the date of Termination,
may be exercised by Participant no later than three (3) months after the date of
Termination, but in any event no later than the Expiration Date.

                   3.2  TERMINATION BECAUSE OF DEATH OR DISABILITY.  If
Participant is Terminated because of death or Disability of Participant (or the
Participant dies within three (3) months after a Termination other than for
Cause or due to Disability), then this Option, to the extent that it is
exercisable by Participant on the date of Termination, may be exercised by
Participant (or Participant's legal representative) no later than twelve (12)
months after the date of Termination, but in any event no later than the
Expiration Date.

                   3.3  TERMINATION FOR CAUSE. If Participant is Terminated
for Cause, this Option will expire on Participant's Termination Date.

                   3.4  NO OBLIGATION TO EMPLOY.  Nothing in the Plan or this
Agreement shall confer on Participant any right to continue in the employ of, or
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.

                4. MANNER OF EXERCISE.

                   4.1  STOCK OPTION EXERCISE AGREEMENT.  To exercise this
Option, Participant (or in the case of exercise after Participant's death,
Participant's executor, administrator, heir or legatee, as the case may be) must
deliver to the Company an executed stock option exercise agreement in the form
attached hereto as EXHIBIT A, or such other documentation as may be reasonably
acceptable to the Company (the "EXERCISE AGREEMENT"), which shall set forth,
INTER ALIA, Participant's election to exercise this Option, the number of Shares
being purchased, any restrictions imposed on the Shares and any representations,
warranties and agreements regarding Participant's investment intent and access
to information as may be


                                      -2-


                                                         Stock Option Agreement

required by the Company to comply with applicable securities laws. If someone
other than Participant exercises this Option, then such person must submit
documentation reasonably acceptable to the Company that such person has the
right to exercise this Option.

                   4.2   LIMITATIONS ON EXERCISE.  This Option may not be
exercised unless such exercise is in compliance with all applicable federal and
state securities laws, as they are in effect on the date of exercise.

                   4.3   PAYMENT.  The Exercise Agreement shall be accompanied
by full payment of the Exercise Price for the Shares being purchased in cash (by
check), or where permitted by law:

       (a)      provided that a public market for the Company's stock exists:
                (1) through a "same day sale" commitment from Participant and a
                broker-dealer that is a member of the National Association of
                Securities Dealers (an "NASD DEALER") whereby Participant
                irrevocably elects to exercise this 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 Participant and a NASD
                Dealer -- whereby Participant irrevocably elects to exercise
                this 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

       (b)      by any combination of the foregoing.

                   4.4   TAX WITHHOLDING.  Prior to the issuance of the Shares
upon exercise of this Option, Participant must pay or provide for any applicable
federal or state withholding obligations of the Company. If the Committee
permits, Participant may provide for payment of withholding taxes upon exercise
of this Option by requesting that the Company retain Shares with a Fair Market
Value equal to the minimum amount of taxes required to be withheld. In such
case, the Company shall issue the net number of Shares to the Participant by
deducting the Shares retained from the Shares issuable upon exercise.

                   4.5   ISSUANCE OF SHARES.  Provided that the Exercise
Agreement and payment are in form and substance satisfactory to counsel for the
Company, the Company shall issue the Shares registered in the name of
Participant, Participant's authorized assignee, or Participant's legal
representative, and shall deliver certificates representing the Shares with the
appropriate legends affixed thereto.

                5. NOTICE OF DISQUALIFYING DISPOSITION OF ISO SHARES. If this
Option is an ISO, and if Participant sells or otherwise disposes of any of the
Shares acquired pursuant to the ISO on or before the later of (a) the date two
(2) years after the Date of Grant, and (b) the date


                                      -3-


                                                         Stock Option Agreement

one (1) year after transfer of such Shares to Participant upon exercise of this
Option, then Participant shall immediately notify the Company in writing of such
disposition.

                6. COMPLIANCE WITH LAWS AND REGULATIONS. The exercise of this
Option and the issuance and transfer of Shares shall be subject to compliance by
the Company and Participant with all applicable requirements of federal and
state securities laws and with all applicable requirements of any stock exchange
on which the Company's Common Stock may be listed at the time of such issuance
or transfer. Participant understands that the Company is under no obligation to
register or qualify the Shares with the Securities and Exchange Commission, any
state securities commission or any stock exchange to effect such compliance.

                7. NONTRANSFERABILITY OF OPTION. This Option may not be
transferred in any manner other than by will or by the laws of descent and
distribution and may be exercised during the lifetime of Participant only by
Participant. The terms of this Option shall be binding upon the executors,
administrators, successors and assigns of Participant.

                8. TAX CONSEQUENCES. Set forth below is a brief summary as of
the date the Board adopted the Plan of some of the federal and California tax
consequences of exercise of this Option and disposition of the Shares. THIS
SUMMARY IS NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT
TO CHANGE. OPTIONEE SHOULD CONSULT A TAX ADVISOR BEFORE EXERCISING THIS OPTION
OR DISPOSING OF THE SHARES.

                   8.1   EXERCISE OF INCENTIVE STOCK OPTION.  To the extent
this Option qualifies as an ISO, there will be no regular federal or California
income tax liability upon the exercise of this Option, although the excess, if
any, of the fair market value of the Shares on the date of exercise over the
Exercise Price will be treated as a tax preference item for federal income tax
purposes and may subject the Optionee to the alternative minimum tax in the year
of exercise.

                   8.2   EXERCISE OF NONQUALIFIED STOCK OPTION.  To the extent
this Option does not qualify as an ISO, there may be a regular federal and
California income tax liability upon the exercise of this Option. Optionee will
be treated as having received compensation income (taxable at ordinary income
tax rates) equal to the excess, if any, of the fair market value of the Shares
on the date of exercise over the Exercise Price. The Company may be required to
withhold from Optionee's compensation or collect from Optionee and pay to the
applicable taxing authorities an amount equal to a percentage of this
compensation income at the time of exercise.

                   8.3   DISPOSITION OF SHARES.  The following tax consequences
may apply upon disposition of the Shares.

                         a.    INCENTIVE STOCK OPTIONS.  If the Shares are held
for more than twelve (12) months after the date of the transfer of the Shares
pursuant to the exercise of an ISO and are disposed of more than two (2) years
after the Date of Grant, any gain realized on


                                      -4-


                                                         Stock Option Agreement

disposition of the Shares will be treated as long-term capital gain for federal
and California income tax purposes. If Shares purchased under an ISO are
disposed of within the applicable one (1) year or two (2) year period, any gain
realized on such disposition will be treated as compensation income (taxable at
ordinary income rates) to the extent of the excess, if any, of the fair market
value of the Shares on the date of exercise over the Exercise Price.

                         b.    NONQUALIFIED STOCK OPTIONS.  If the Shares are
held for more than twelve (12) months after the date of the transfer of the
Shares pursuant to the exercise of an NQSO, any gain realized on disposition of
the Shares will be treated as long-term capital gain.

                9. PRIVILEGES OF STOCK OWNERSHIP. Participant shall not have any
of the rights of a shareholder with respect to any Shares until Participant
exercises this Option and pays the Exercise Price.

               10. INTERPRETATION. Any dispute regarding the interpretation of
this Agreement shall be submitted by Participant or the Company to the Committee
for review. The resolution of such a dispute by the Committee shall be final and
binding on the Company and Participant.

               11. ENTIRE AGREEMENT. The Plan is incorporated herein by
reference. This Agreement and the Plan and the Exercise Agreement constitute the
entire agreement and understanding of the parties hereto with respect to the
subject matter hereof and supersede all prior understandings and agreements with
respect to such subject matter.

                12. NOTICES. Any notice required to be given or delivered to the
Company under the terms of this Agreement shall be in writing and addressed to
the Corporate Secretary of the Company at its principal corporate offices. Any
notice required to be given or delivered to Participant shall be in writing and
addressed to Participant at the address indicated above or to such other address
as such party may designate in writing from time to time to the Company. All
notices shall be deemed to have been given or delivered upon: personal delivery;
three (3) days after deposit in the United States mail by certified or
registered mail (return receipt requested); one (1) business day after deposit
with any return receipt express courier (prepaid); or one (1) business day after
transmission by rapifax or telecopier.

                13. SUCCESSORS AND ASSIGNS. The Company may assign any of its
rights under this Agreement. This Agreement shall be binding upon and inure to
the benefit of the successors and assigns of the Company. Subject to the
restrictions on transfer set forth herein, this Agreement shall be binding upon
Participant and Participant's heirs, executors, administrators, legal
representatives, successors and assigns.

                14. GOVERNING LAW. This Agreement shall be governed by and
construed in accordance with the internal laws of the State of California,
without regard to that body of law pertaining to choice of law or conflict of
law.


                                      -5-


                                                         Stock Option Agreement

                15. ACCEPTANCE. Participant hereby acknowledges receipt of a
copy of the Plan and this Agreement. Participant has read and understands the
terms and provisions thereof, and accepts this Option subject to all the terms
and conditions of the Plan and this Agreement. Participant acknowledges that
there may be adverse tax consequences upon exercise of this Option or
disposition of the Shares and that the Company has advised Participant to
consult a tax advisor prior to such exercise or disposition.

               IN WITNESS WHEREOF, the Company has caused this Agreement to be
executed in duplicate by its duly authorized representative and Participant has
executed this Agreement in duplicate as of the Date of Grant.

INTEGRATED SYSTEMS, INC.                                  PARTICIPANT


By:
    -------------------------------         ----------------------------------
                                            (Signature)

- -----------------------------------         -----------------------------------
(Please print name)                         (Please print name)

- -----------------------------------         -----------------------------------
(Please print title)


                                      -6-


                                    EXHIBIT A


                         STOCK OPTION EXERCISE AGREEMENT




                            INTEGRATED SYSTEMS, INC.
                     1998 EQUITY INCENTIVE PLAN (THE "PLAN")
                         STOCK OPTION EXERCISE AGREEMENT

           I hereby elect to purchase the number of shares of Common Stock of
INTEGRATED SYSTEMS, INC. (the "COMPANY") as set forth below:



                                                   
Participant_____________________________              Number of Shares Purchased:________________________
Social Security Number: ________________              Purchase Price per Share:__________________________
Address:________________________________              Aggregate Purchase Price:__________________________
        ________________________________              Date of Option Agreement:__________________________

Type of Option: [ ] Incentive Stock Option            Exact Name of Title to Shares: ____________________
                [ ] Nonqualified Stock Option         ___________________________________________________



1. DELIVERY OF PURCHASE PRICE. Participant hereby delivers to the Company the
Aggregate Purchase Price, to the extent permitted in the Option Agreement (the
"OPTION AGREEMENT") in cash (by check) in the amount of $_____________________,
receipt of which is acknowledged by the Company.

2. MARKET STANDOFF AGREEMENT. Participant, if requested by the Company and an
underwriter of Common Stock (or other securities) of the Company, agrees not to
sell or otherwise transfer or dispose of any Common Stock (or other securities)
of the Company held by Participant during the period requested by the managing
underwriter following the effective date of a registration statement of the
Company filed under the Securities Act, provided that all officers and directors
of the Company are required to enter into similar agreements. Such agreement
shall be in writing in a form satisfactory to the Company and such underwriter.
The Company may impose stop-transfer instructions with respect to the shares (or
other securities) subject to the foregoing restriction until the end of such
period.

3. TAX CONSEQUENCES. PARTICIPANT UNDERSTANDS THAT PARTICIPANT MAY SUFFER ADVERSE
TAX CONSEQUENCES AS A RESULT OF PARTICIPANT'S PURCHASE OR DISPOSITION OF THE
SHARES. PARTICIPANT REPRESENTS THAT PARTICIPANT HAS CONSULTED WITH ANY TAX
CONSULTANT(S) PARTICIPANT DEEMS ADVISABLE IN CONNECTION WITH THE PURCHASE OR
DISPOSITION OF THE SHARES AND THAT PARTICIPANT IS NOT RELYING ON THE COMPANY FOR
ANY TAX ADVICE.

4. ENTIRE AGREEMENT. The Plan and Option Agreement are incorporated herein by
reference. This Exercise Agreement, the Plan and the Option Agreement constitute
the entire agreement and understanding of the parties and supersede in their
entirety all prior understandings and agreements of the Company and Participant
with respect to the subject matter hereof, and are governed by California law
except for that body of law pertaining to choice of law or conflict of law.


Date:
      ----------------------------------           -----------------------------
                                                     SIGNATURE OF PARTICIPANT





                                 SPOUSAL CONSENT


         I acknowledge that I have read the foregoing Stock Option Exercise
Agreement (the "AGREEMENT") and that I know its contents. I hereby consent to
and approve all the provisions of the Agreement, and agree that the shares of
the Common Stock of Integrated Systems, Inc. purchased thereunder (the "SHARES")
and any interest I may have in such Shares are subject to all the provisions of
the Agreement. I will take no action at any time to hinder operation of the
Agreement on these Shares or any interest I may have in or to them.






      -------------------------------------            Date:__________________
      SIGNATURE OF PARTICIPANT'S SPOUSE

      -------------------------------------
      SPOUSE'S NAME - TYPED OR PRINTED

      -------------------------------------
      PARTICIPANT'S NAME - TYPED OR PRINTED