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 direc-



                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan


tion 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.

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                                                        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
                         Participant

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                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan


                         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.

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                                                        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.

                         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

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                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan


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  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

                                      -7-



                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan


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 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

                                      -8-



                                                        Integrated Systems, Inc.
                                                      1998 Equity Incentive Plan


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 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

                (e)      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-