INTEGRATED SYSTEMS INC
S-8, 1998-09-29
PREPACKAGED SOFTWARE
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  As filed with the Securities and Exchange Commission on September 29, 1998
                                                    Registration No. 333-_______

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

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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

                                    FORM S-8
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                            INTEGRATED SYSTEMS, INC.
             (Exact name of Registrant as specified in its charter)

       California                                      94-2658153
(State of Incorporation)                    (I.R.S. Employer Identification No.)

               201 Moffett Park Drive, Sunnyvale, California 94089
           (Address of Principal Executive Office Including Zip Code)

                            INTEGRATED SYSTEMS, INC.
                             1988 STOCK OPTION PLAN
                           1998 EQUITY INCENTIVE PLAN
                            (Full title of the plan)

                                Narendra K. Gupta
                Integrated Systems, Inc., 201 Moffett Park Drive
                           Sunnyvale, California 94089
                                 (408) 542-1500
            (Name, address and telephone number of agent for service)

                                    Copy to:
                            Katherine Tallman Schuda
                               Fenwick & West LLP
                              Two Palo Alto Square
                               Palo Alto, CA 94306
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------
                                         CALCULATION OF REGISTRATION FEE

- ------------------------------------------------------------------------------------------------------------------
                                               Proposed
                                               Maximum
Title of                Amount                 Offering               Proposed Maximum
Securities to           to be                  Price per              Aggregate Offering    Amount of
Be Registered           Registered             Share (1)              Price                 Registration Fee
- ----------------------- ---------------------- ---------------------- --------------------- ----------------------
<S>                     <C>                    <C>                    <C>                   <C>   
Common Stock            2,000,000              $9.50                  $19,000,000           $5,605

- ----------------------- ---------------------- ---------------------- --------------------- ----------------------
<FN>
(1)      Estimated solely for the purpose of calculating the registration fee in
         accordance  with Rules  457(h) and 457(c) under the  Securities  Act of
         1933 and based upon an average of the high and low prices  reported  on
         the Nasdaq National Market on September 24, 1998.
</FN>
</TABLE>

<PAGE>


                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference.

         The  following   documents  filed  with  the  Securities  and  Exchange
Commission (the "Commission") are incorporated by reference in this Registration
Statement:

         1. The  Registrant's  Annual  Report on Form 10-K for the  fiscal  year
ended  February  28, 1998,  filed  pursuant to Section  13(a) of the  Securities
Exchange  Act of 1934,  as amended (the  "Exchange  Act"),  which Annual  Report
contains  audited  financial  statements  for the fiscal year ended February 28,
1998;

         2. The  Registrant's  Quarterly  Report  on Form  10-Q  for the  fiscal
quarter ended May 31, 1998 filed  pursuant to Section 13(a) of the Exchange Act;
and

         3. The  description of the  Registrant's  Common Stock contained in the
Registrant's  Registration Statement on Form 8-A filed with the Commission under
Section 12(g) of the Exchange  Act,  including any amendment or report filed for
the purpose of updating such description.

         All  documents  filed by the  Registrant  pursuant to  Sections  13(a),
13(c),  14 and 15(d) of the  Exchange  Act  after the date of this  Registration
Statement, and prior to the filing of a post-effective amendment which indicates
that all securities  registered  hereby have been sold or which  deregisters all
securities  then  remaining  unsold,  shall  be  deemed  to be  incorporated  by
reference in this  Registration  Statement and to be a part hereof from the date
of the filing of such documents.

Item 4.  Description of Securities.

         Not applicable.

Item 5.  Interests of Named Experts and Counsel.

         Not applicable.

Item 6.  Indemnification of Directors and Officers.

         The  provisions  of Section 317 of the  California  Corporations  Code,
Article V of the Registrant's Amended and Restated Articles of Incorporation and
Article VI of the Registrant's  Bylaws provide for indemnification for expenses,
judgments, fines, settlements and other amounts actually and reasonably incurred
in connection with any proceeding  arising by reason of the fact that any person
is or was a director or officer of the Registrant.  The  Registrant's  directors
and executive  officers  have also entered into  Indemnity  Agreements  with the
Registrant  that  give  such  directors  and  executive   officers   contractual
assurances regarding the scope of the indemnification and liability  limitations
set forth in the Registrant's Amended and Restated Articles of Incorporation and
Bylaws. The indemnification may be sufficiently broad to permit  indemnification
of the  Registrant's  executive  officers and directors for liabilities  arising
under the Securities Act. In addition,  Article IV of the  Registrant's  Amended
and  Restated  Articles of  Incorporation  provides  that the  liability  of the
Registrant's  directors  shall be eliminated to the fullest  extent  permissible
under California law. The Registrant  maintains a director and officer liability
insurance policy.

         Insofar as indemnification for liabilities arising under the Act may be
permitted to directors,  officers or controlling persons of the Company pursuant
to the foregoing provisions,  the Company has been informed that, in the opinion
of the  Securities  and Exchange  Commission,  such  indemnification  is against
public policy as expressed in the Act and is therefore unenforceable.

                                      II-1

<PAGE>

Item 7.  Exemption From Registration Claimed.

         Not applicable.

Item 8.  Exhibits.

The following exhibits are filed herewith:

Exhibit No.                           Description
- -----------                           -----------

4.01                               Registrant's Amended and Restated Articles of
                                   Incorporation  (incorporated  by reference to
                                   Exhibit  3.01(i) to the  Registrant's  Annual
                                   Report on Form 10-K for the fiscal year ended
                                   February 28, 1996).

4.02                               Registrant's   Bylaws,  as  amended  to  date
                                   (incorporated by reference to Exhibit 4.02 to
                                   the  Registrant's  Registration  Statement on
                                   Form S-8, File No. 333-12799).

4.03                               Registrant's   1988  Stock  Option  Plan  and
                                   related documents, as amended to date.

4.04                               Registrant's 1998 Equity Incentive Plan.

5.01                               Opinion of Fenwick & West LLP

23.01                              Consent of Counsel (included in Exhibit 5.01)

23.02                              Consent of PricewaterhouseCoopers LLP

24.01                              Power of Attorney (See page II-5)



Item 9.  Undertakings.

         The undersigned registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this registration statement:

                  (a) To include any prospectus  required by Section 10(a)(3) of
         the Securities Act of 1933;

                  (b) To reflect in the  prospectus  any facts or events arising
         after the  effective  date of the  registration  statement (or the most
         recent post-effective amendment thereto) which,  individually or in the
         aggregate,  represent a fundamental change in the information set forth
         in the  registration  statement.  Notwithstanding  the  foregoing,  any
         increase  or  decrease  in volume of  securities  offered (if the total
         dollar  value of  securities  offered  would not exceed  that which was
         registered) and any deviation from the low or high end of the estimated
         maximum offering range may be reflected in the form of prospectus filed
         with the Commission  pursuant to Rule 424(b) if, in the aggregate,  the
         changes in volume and price  represent no more than a 20 percent change
         in the maximum  aggregate  offering price set forth in the "Calculation
         of Registration Fee" table in the effective registration statement;

                  (c) To include any  material  information  with respect to the
         plan of  distribution  not  previously  disclosed  in the  registration
         statement  or  any  material   change  to  such   information   in  the
         registration statement.

         Provided,  however,  that paragraphs  (1)(a) and (1)(b) do not apply if
the information  required to be included in a post-effective  amendment by those
paragraphs  is  contained  in periodic  reports  filed with or  furnished

                                      II-2

<PAGE>

to the Commission by the  registrant  pursuant to Section 13 or Section 15(d) of
the Securities  Exchange Act of 1934 that are  incorporated  by reference in the
registration statement.

         (2) That,  for the  purpose  of  determining  any  liability  under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (3) To remove from registration by means of a post-effective  amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         (4)  That,  for  purposes  of  determining   any  liability  under  the
Securities Act of 1933, each filing of the  registrant's  annual report pursuant
to Section 13(a) or Section 15(d) of the  Securities  Exchange Act of 1934 (and,
where  applicable,  each  filing of an employee  benefit  plan's  annual  report
pursuant  to  Section  15(d) of the  Securities  Exchange  Act of 1934)  that is
incorporated by reference in the registration  statement shall be deemed to be a
new registration  statement relating to the securities offered therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (5) To deliver or cause to be delivered  with the  prospectus,  to each
person to whom the  prospectus  is sent or given,  the latest  annual  report to
security  holders  that is  incorporated  by  reference  in the  prospectus  and
furnished  pursuant to and meeting the  requirements of Rule 14a-3 or Rule 14c-3
under  the  Securities  Exchange  Act of  1934;  and,  where  interim  financial
information  required to be presented by Article 3 of Regulation  S-X is not set
forth in the prospectus,  to deliver, or cause to be delivered to each person to
whom the  prospectus  is sent or given,  the  latest  quarterly  report  that is
specifically incorporated by reference in the prospectus to provide such interim
financial information.

         (6)  Insofar  as  indemnification  for  liabilities  arising  under the
Securities Act of 1933 may be permitted to directors,  officers and  controlling
persons of the registrant  pursuant to the foregoing  provisions,  or otherwise,
the  registrant  has been  advised  that in the  opinion of the  Securities  and
Exchange  Commission such  indemnification is against public policy as expressed
in the Act and is,  therefore,  unenforceable.  In the  event  that a claim  for
indemnification  against  such  liabilities  (other  than  the  payment  by  the
registrant of expenses  incurred or paid by a director,  officer or  controlling
person of the  registrant  in the  successful  defense  of any  action,  suit or
proceeding)  is  asserted by such  director,  officer or  controlling  person in
connection with the securities being registered,  the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

                                      II-3

<PAGE>


                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
registrant,  Integrated Systems,  Inc., certifies that it has reasonable grounds
to believe that it meets all of the  requirements for filing on Form S-8 and has
duly  caused  this  registration  statement  to be signed  on its  behalf by the
undersigned,  thereunto  duly  authorized,  in the City of  Sunnyvale,  State of
California, on September 25, 1998.

                                              INTEGRATED SYSTEMS, INC.


                                              By:      /s/ Narendra K. Gupta
                                                       -------------------------
                                                       Narendra K. Gupta
                                                       Secretary





                                      II-4


<PAGE>


                                POWER OF ATTORNEY

         Each person whose  signature  appears  below  constitutes  and appoints
Narendra  K. Gupta and  William  C. Smith and each of them,  his true and lawful
attorneys-in-fact and agents, each with full power of substitution,  for him and
in his name,  place and stead,  in any and all  capacities,  to sign any and all
amendments (including post-effective  amendments) to this Registration Statement
and to file  the  same,  with  exhibits  thereto  and  all  other  documents  in
connection therewith,  with the Securities and Exchange Commission,  granting to
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing  requisite  and necessary to be done
in  connection  therewith,  as fully to all intents and  purposes as he might or
could  do  in  person,   hereby   ratifying   and   confirming   all  that  said
attorneys-in-fact  and agents or either of them,  or their or his  substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.
<PAGE>
<TABLE>
         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
registration  statement  has  been  signed  by  the  following  persons  in  the
capacities and on the dates indicated.
<CAPTION>
Signature                                  Title                                    Date
- --------------------------------------     -------------------------------------    -------------------------------------
Principal Executive Officers:
<S>                                        <C>                                      <C>
/s/ Narendra K. Gupta                      Secretary and Chairman of the Board      September 25, 1998
- ------------------------------------       of Directors
Narendra K. Gupta

/s/ Joseph Addiego                         Interim Chief Executive Officer          September 25, 1998
- ------------------------------------
Joseph Addiego

Principal Financial Officer and
Principal Accounting Officer:

/s/ William C. Smith                       Vice President, Finance and Chief        September 25, 1998
- ------------------------------------       Financial Officer
William C. Smith

Additional Directors:

                                           Director                                 September __, 1998
- ------------------------------------
David St. Charles

/s/ Thomas Kailath                         Director                                 September 25, 1998
- ------------------------------------
Thomas Kailath

/s/ Vinita Gupta                           Director                                 September 25, 1998
- ------------------------------------
Vinita Gupta

/s/John C. Bolger                          Director                                 September 25, 1998
- ------------------------------------
John C. Bolger

/s/Richard C. Murphy                       Director                                 September 25, 1998
- ------------------------------------
Richard C. Murphy

/s/Michael A. Brochu                       Director                                 September 25, 1998
- ------------------------------------
Michael A. Brochu
</TABLE>

                                                  II-5

<PAGE>

                                                 INDEX TO EXHIBITS


Exhibit Number                Exhibit
- --------------                -------
4.01                          Registrant's  Amended  and  Restated  Articles  of
                              Incorporation   (incorporated   by   reference  to
                              Exhibit 3.01(i) to the Registrant's  Annual Report
                              on Form 10-K for the fiscal  year  ended  February
                              28, 1996).

4.02                          Registrant's    Bylaws,   as   amended   to   date
                              (incorporated  by reference to Exhibit 4.02 to the
                              Registrant's  Registration  Statement on Form S-8,
                              File No. 333-12799)

4.03                          Registrant's  1988 Stock  Option  Plan and related
                              documents, as amended to date.

4.04                          Registrant's 1998 Equity Incentive Plan.

5.01                          Opinion of Fenwick & West LLP

23.01                         Consent of Counsel (included in Exhibit 5.01)

23.02                         Consent of PricewaterhouseCoopers LLP

24.01                         Power of Attorney (See page II-5)








                            INTEGRATED SYSTEMS, INC.
                             1988 Stock Option Plan
                          As Adopted September 26, 1988
                        As Amended through March 28, 1997



         1. PURPOSE.  This Stock Option Plan ("Plan") is  established to provide
incentive for selected persons to promote the financial  success and progress of
Integrated  Systems,  Inc. (the  "Company") by granting such persons  options to
purchase shares of common stock of the Company.

         2. ADOPTION AND  SHAREHOLDER  APPROVAL.  This Plan shall be approved by
the shareholders of the Company, in any manner permitted by applicable corporate
law,  within twelve (12) months before or after the date this Plan is adopted by
the  Board of  Directors  of the  Company  (the  "Board")  and after the date of
certain  amendments to the Plan.  In addition,  no later than twelve (12) months
after the Company  becomes  subject to Section 16(b) of the Securities  Exchange
Act of 1934,  as amended (the  "Exchange  Act") the Company will comply with the
requirements of Rule 16b-3 with respect to shareholder approval.

         3. TYPES OF OPTIONS AND SHARES.  Options  granted  under this Plan (the
"Options") may be either (a) incentive stock options ("ISOs") within the meaning
of  Section  422 of the  Internal  Revenue  Code of 1986  (the  "Code"),  or (b)
nonqualified  stock options  ("NQSOs"),  as designated at the time of grant. The
shares of stock that may be purchased  upon  exercise of Options  granted  under
this Plan (the "Shares") are shares of the common stock of the Company.

         4. NUMBER OF SHARES.  The  maximum  number of Shares that may be issued
pursuant to Options granted under this Plan is Six Million  (6,000,000)  Shares,
subject to adjustment as provided in this Plan. If any Option is terminated  for
any reason  without  being  exercised  in whole or in part,  the Shares  thereby
released  from such Option shall be available  for purchase  under other Options
subsequently granted under this Plan. At all times during the term of this Plan,
the Company shall reserve and keep  available  such number of Shares as shall be
required to satisfy the requirements of outstanding Options under this Plan.

         5.  ADMINISTRATION.  This  Plan may be  administered  by the Board or a
Committee appointed by the Board (the "Committee").  If, at the time the Company
registers  under the Exchange  Act, a majority of the Board is not  comprised of
Disinterested  Persons,  the Board shall  appoint a Committee  consisting of not
less than three persons (who need not be members of the Board),  each of whom is
a  "Disinterested  Person" (as  defined in Section  6(b)(iv) of the Plan) and an
"Outside  Director"  (as defined in Section  6(b)(vi) of the Plan) or  qualifies
under transition rules as an Outside Director.  As used in this Plan, references
to the "Committee" shall mean either such Committee or the Board if no Committee
has been established.  After registration of the Company under the Exchange Act,
Board  members  who are not  Disinterested  Persons  may not vote on any matters
affecting  the  administration  of this  Plan  or on the  grant  of any  Options
pursuant to this Plan to any officer or director of the Company or other  person
(in each case, an "Insider")  whose  transactions in the Company's  common stock
are subject to Section  16(b) of the  Exchange  Act,  but any such member may be
counted for  determining  the  existence of a quorum at any meeting of the Board
during which action is taken with respect to Options or  administration  of this
Plan and may vote on the grant of any  Options  pursuant to this Plan other than
to Insiders.  The  interpretation  by the Committee of any of the  provisions of
this Plan or any Option  granted under this Plan shall be final and binding upon
the  Company  and all  persons  having an  interest  in any Option or any Shares
purchased  pursuant to an Option.  The  Committee  may delegate the authority to
officers of the Company to grant  Options  under this Plan to Optionees  who are
not Insiders of the Company.  No Optionee shall be eligible to receive more than
250,000 Shares at any time during the term of this Plan pursuant to the grant of
Options hereunder.

                                       1

<PAGE>

         6.  ELIGIBILITY.  Options  may  be  granted  only  to  such  employees,
officers,  directors and consultants of the Company or any Parent, Subsidiary or
Affiliate of the Company (as defined  below) as the Committee  shall select from
time to time in its sole discretion ("Optionees"),  provided that only employees
of the Company or a Parent or  Subsidiary  of the  Company  shall be eligible to
receive ISOs. An Optionee may be granted more than one Option under this Plan.

                  (a) Assumption of Options. The Company may, from time to time,
assume  outstanding  options granted by another  company,  whether in connection
with an acquisition  of such other company or otherwise,  by either (i) granting
an option under this Plan in  replacement  of the option assumed by the Company,
or (ii) treating the assumed option as if it had been granted under this Plan if
the terms of such  assumed  option could be applied to an option  granted  under
this Plan.  Such  assumption  shall be  permissible if the holder of the assumed
option would have been  eligible to be granted an option  hereunder if the other
Company had applied the rules of this Plan to such grant.

                  (b)  Definitions.  As used in the Plan,  the  following  terms
shall have the following meanings:

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

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

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

                           (iv)     "Disinterested   Person"   shall   have  the
meaning set forth in Rule  16b-3(d)(3)  as  promulgated  by the  Securities  and
Exchange  Commission  ("SEC")  under  Section 16(b) of the Exchange Act, as such
rule is amended from time to time and as interpreted by the SEC.

                           (v)      "Fair  Market  Value"  shall  mean  the fair
market value of the Shares as determined  by the Committee  from time to time in
good faith.  If a public  market  exists for the Shares,  the Fair Market  Value
shall be the average of the last  reported bid and asked prices for Common Stock
of the Company on the last trading day prior to the date of determination or, in
the event the Common  Stock of the Company is listed on a stock  exchange or the
Nasdaq National Market, the Fair Market Value shall be the closing price on such
exchange  or  quotation  system  on the last  trading  day  prior to the date of
determination.

                           (vi)     "Outside  Director"  shall mean any director
who is not (i) a current  employee of the Company or any Parent,  Subsidiary  or
Affiliate of the Company,  (ii) a former  employee of the Company or any Parent,
Subsidiary or Affiliate of the Company who is receiving  compensation  for prior
services  (other than benefits  under a  tax-qualified  pension  plan),  (iii) a
current or former officer of the Company or any Parent,  Subsidiary or Affiliate
of the Company or (iv) currently receiving compensation for personal services in
any  capacity,  other  than as a  director,  from  the  Company  or any  Parent,
Subsidiary or Affiliate of the Company; provided,  however, that at such time as
the term "Outside  Director",  as used in Section 162(m) of the Code, is defined
in the regulations  promulgated under Section 162(m),  "Outside  Director" shall
have the meaning set forth in such regulations, as amended from time to time and
as interpreted by the Internal Revenue Service.

                                       2
<PAGE>

         7. TERMS AND  CONDITIONS  OF OPTIONS.  The  Committee  shall  determine
whether  each Option is to be an ISO or an NQSO,  the number of Shares for which
the Option  shall be granted,  the  exercise  price of the  Option,  the periods
during which the Option may be exercised,  and all other terms and conditions of
the Option, subject to the following terms and conditions:

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

                  (b) Exercise  Price.  The exercise price of an Option shall be
not less than the Fair Market  Value of the Shares,  at the time that the Option
is granted.  The exercise  price of any Option granted to a person owning 10% or
more of the total  combined  voting power of all classes of stock of the Company
or any Parent or Subsidiary of the Company ("Ten Percent Shareholder") shall not
be less  than  110% of the Fair  Market  Value of the  Shares at the time of the
grant, as determined by the Committee in good faith.

                  (c) Exercise Period.  Options shall be exercisable  within the
times or upon the events  determined by the Committee as set forth in the option
grant;  provided,  however,  that no  Option  shall  be  exercisable  after  the
expiration  of ten years  from the date the  option  is  granted,  and  provided
further that no Option granted to a Ten Percent Shareholder shall be exercisable
after the expiration of five years from the date the Option is granted.

                  (d)  Limitations  on ISOs.  The  aggregate  Fair Market  Value
(determined  as of the time an Option is granted) of stock with respect to which
ISOs are  exercisable for the first time by an Optionee during the calendar year
(under this Plan or under any other  incentive  stock option plan of the Company
or any Parent or Subsidiary of the Company)  shall not exceed  $100,000.  If the
Fair  Market  Value of stock  with  respect  to which  ISOs are first  exercised
exceeds  $100,000,  the Options for the first  $100,000  worth of stock shall be
ISOs and options for the amount in excess of $100,000 shall be NQSOs.

                  (e) Date of Grant. The date of grant of an Option shall be the
date on which the Committee makes the  determination to grant such Option unless
otherwise specified by the Committee. The Grant representing the Option shall be
delivered  to the Optionee  within a  reasonable  time after the granting of the
Option.

                  (f)  Assumed  Options.  In the event the  Company  assumes  an
option granted by another company, the terms and conditions of such option shall
remain unchanged  (except the exercise price and the number and nature of shares
issuable upon exercise, which will be adjusted appropriately pursuant to Section
425(c)  of the  Code).  In the event the  Company  elects to grant a new  option
rather than assuming an existing  option (as specified in Section 6(a), such new
option  need not be  granted at Fair  Market  Value on the date of grant and may
instead be granted with a similarly adjusted exercise price.

         8. EXERCISE OF OPTIONS.

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

                                       3

<PAGE>

                  (b)  Payment.  Payment  for the Shares may be made (i) in cash
(by check); (ii) by surrender of shares of common stock of the Company that have
been owned by  Optionee  for more than six (6) months  (and which have been paid
for within the meaning of SEC Rule 144 and, if such shares were  purchased  from
the  Company  by use of a  promissory  note,  such note has been fully paid with
respect to such  shares) or were  obtained  by the  Optionee  in the open public
market,  having a Fair Market Value equal to the  exercise  price of the Option;
(iii) where  permitted by  applicable  law and approved by the  Committee in its
sole discretion,  by tender of a full recourse promissory note having such terms
as may be approved by the Committee;  (iv) provided that a public market for the
Company's stock exists,  through a "same day sale"  commitment from the Optionee
and a broker-dealer  that is a member of the National  Association of Securities
Dealers (a "NASD Dealer")  whereby the Optionee  irrevocably  elects to exercise
the  Option  and to sell a portion  of the  Shares so  purchased  to pay for the
exercise price and whereby the NASD Dealer  irrevocably  commits upon receipt of
such Shares to forward the exercise price directly to the Company; or (v) by any
combination  of the  foregoing  where  approved  by the  Committee  in its  sole
discretion.  Optionees  who are not  employees or directors of the Company shall
not be  entitled to purchase  Shares with a  promissory  note unless the note is
adequately secured by collateral other than the Shares.

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

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

                           (i)      If an Optionee  ceases to be employed by the
Company or any Parent,  Subsidiary  or  Affiliate  of the Company for any reason
except death or disability, the Optionee may exercise such Optionee's Options to
the extent (and only to the extent) that it would have been exercisable upon the
date of  termination,  within three (3) months after the date of termination (or
such shorter time period as may be specified in the Grant),  provided  that,  if
Optionee  is an Insider  and the  Company  is  subject  to Section  16(b) of the
Exchange Act, the  Optionee's  Option will be  exercisable  for a period of time
sufficient to allow such Optionee from having a matching purchase and sale under
Section 16(b),  with any extension  beyond three (3) months from  termination of
employment in the case of an Option constituting an ISO being deemed to be as an
NQSO, and provided  further that in no event may an Option be exercisable  later
than the expiration date of the Option.

                           (ii)     If an Optionee's employment with the Company
or any Parent,  Subsidiary or Affiliate of the Company is terminated  because of
the death of the  Optionee  or  disability  of  Optionee  within the  meaning of
Section  22(e)(3) of the Code, such  Optionee's  Options may be exercised to the
extent  (and only to the  extent)  that it would  have been  exercisable  by the
Optionee on the date of  termination,  by the Optionee (or the Optionee's  legal
representative) within twelve (12) months after the date of termination (or such
shorter time period as may be specified in the Grant), but in any event no later
than the expiration date of the Options.

                           (iii)    The  Committee   shall  have  discretion  to
determine  whether the  Optionee has ceased to be employed by the Company or any
Parent,  Subsidiary or Affiliate of the Company and the effective  date on which
such employment terminated.

                           (iv)     In  the  case  of  an  Optionee   who  is  a
director, independent consultant, contractor or advisor, the Committee will have
the discretion to determine  whether the Optionee is "employed by the Company or
any Parent,  Subsidiary  or Affiliate of the Company"  pursuant to the foregoing
Sections.

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

                                       4

<PAGE>

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

         9.  NONTRANSFERABILITY OF OPTIONS. During the lifetime of the Optionee,
an Option  shall be  exercisable  only by the  Optionee.  No Option may be sold,
pledged, assigned, hypothecated,  transferred or disposed of in any manner other
than by will or by the laws of descent and distribution.

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

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

         12. NO OBLIGATION TO EMPLOY. Nothing in this Plan or any Option granted
under this Plan shall confer on any Optionee any right to continue in the employ
of the Company or any Parent, Subsidiary or Affiliate of the Company or limit in
any way the right of the Company or any Parent,  Subsidiary  or Affiliate of the
Company to terminate  the  Optionee's  employment  at any time,  with or without
cause.

         13.  COMPLIANCE  WITH LAWS.  The grant of Options  and the  issuance of
Shares upon  exercise of any Options  shall be subject to and  conditioned  upon
compliance with all applicable requirements of law, including without limitation
compliance with the Securities Act of 1933, as amended, any required approval by
the Commissioner of Corporations of the State of California, compliance with all
other  applicable  state securities laws and compliance with the requirements of
any stock exchange on which the Shares may be listed. The Company shall be under
no obligation to register the Shares with the SEC or to effect  compliance  with
the registration or  qualification  requirements of any state securities laws or
stock exchange.

         14.  RESTRICTIONS  ON SHARES.  At the discretion of the Committee,  the
Company  may  reserve to itself or its  assignee(s)  in the Grant (a) a right of
first  refusal  to  purchase  any  Shares  that  an  Optionee  (or a  subsequent
transferee)  may  propose  to  transfer  to a third  party  and  (b) a right  to
repurchase  all Shares held by an Optionee upon the  Optionee's  termination  of
employment or service with the Company or its Parent, Subsidiary or Affiliate of
the  Company  for any  reason  within  a  specified  time as  determined  by the
Committee at the time of grant at (i) the  Optionee's  original  purchase  price
(provided  that the right to repurchase at such price shall lapse at the rate of
at least 20% per year from the date of  grant),  (ii) the Fair  Market  Value of
such  Shares  as  determined  by the  Committee  in good  faith or (iii) a price
determined by a formula or other provision set forth in the Grant.

         15. ASSUMPTION OF OPTIONS BY SUCCESSORS.  In the event of a dissolution
or  liquidation  of the  Company,  a merger  in  which  the  Company  is not the
surviving  corporation,  or the sale of  substantially  all of the assets of the
Company,  any or all  outstanding  Options shall,  notwithstanding  any contrary
terms of the Grant,  accelerate and become exercisable in full at least ten days
prior  to  (and  shall  expire  on)  the   consummation  of  such   dissolution,
liquidation, merger or sale of stock or sale of assets on such conditions as the
Committee  shall  determine  unless  the  successor   corporation   assumes  the
outstanding  Options  or  substitutes   substantially  equivalent  options.  The
aggregate  Fair Market  Value  (determined  at the time an Option is granted) of
stock with  respect to ISOs which first become  exercisable  in the year of such
dissolution,  liquidation, merger, sale of stock or sale of

                                       5

<PAGE>

assets cannot exceed $100,000. Any remaining accelerated ISOs shall be NQSOs.

         16.  AMENDMENT OR  TERMINATION  OF PLAN.  The Committee may at any time
terminate or amend this Plan in any respect (including,  but not limited to, any
form of Grant,  agreement or instrument  to be executed  pursuant to this Plan);
provided,  however,  that the Committee  shall not,  without the approval of the
holders of a majority of the  outstanding  voting  shares of the Company,  amend
this Plan in any manner that requires such shareholder  approval pursuant to the
Code or the  regulations  promulgated  thereunder  as such  provisions  apply to
incentive  stock  option plans or pursuant to the Exchange Act or Rule 16b-3 (or
its successor) promulgated thereunder.

         17.  TERM OF PLAN.  Options  may be granted  pursuant to this Plan from
time to time  within a period of ten years from the date this Plan is adopted by
the Board.

                                        6

<PAGE>

                               STOCK OPTION GRANT


Optionee:

Address:


Grant Number:

Total Options Granted:

Date of Grant:

Vesting Commencement Date:

Expiration Date:

Type of Stock Option:


         1.  Grant of  Option.  Integrated  Systems,  Inc.  (the  "Company"),  a
California corporation, hereby grants to the optionee named on the previous page
("Optionee") an option (this "Option") to purchase the total number of shares of
common stock of the Company (the  "Shares") at the exercise price per Share (the
"Exercise Price"),  subject to all of the terms and conditions of this Grant and
the  Company's  1988 Stock  Option  Plan as adopted  September  26,  1988 and as
amended  through May 25, 1994 (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 422A of the Internal  Revenue Code of 1986
(the "Code").

         2. Exercise  Period of Option.  Subject to the terms and  conditions of
the Plan and this Grant, this Option shall become exercisable as follows:

                  (a) 25% of the Shares shall become  exercisable one year after
the Vesting Commencement Date; and

                  (b) 1/48th of the Shares shall become  exercisable  at the end
of every one-month period thereafter;

     provided, however, that this Option may not be exercised as to any fraction
     of a Share and no compensation  will be paid for any fractional  Share; and
     provided  further that this Option shall expire on the Expiration  Date and
     must be exercised, if at all, on or before the Expiration Date.

                                       1

<PAGE>

         3. Restrictions on Exercise.  Exercise of this Option is subject to the
following limitations:

                 (a) This Option may not be exercised unless such exercise is in
                     compliance with the Securities Act of 1933, as amended, and
                     all applicable  state securities laws as they are in effect
                     on the date of exercise,  any standback  restrictions,  and
                     the  requirements  of any stock exchange or national market
                     system on which the Company's Common Stock may be listed at
                     the time of exercise.

                  (b) This  Option  may not be  exercised  as to fewer  than 100
                      Shares unless it is exercised as to all Shares as to which
                      this Option is then exercisable.

         4.  Termination  of Option.  Except as provided  below in this Section,
this Option shall  terminate  and may not be exercised if Optionee  ceases to be
employed  by the Company or any Parent or  Subsidiary  of the Company (or in the
case of a  nonqualified  stock option,  an Affiliate of the  Company).  Optionee
shall be  considered  to be  employed  by the Company if Optionee is an officer,
director or full-time  employee of the  Company,  or any Parent,  Subsidiary  or
Affiliate of the Company or if the Board of Directors  determines  that Optionee
is  rendering  substantial  services  as a  part-time  employee,  consultant  or
independent contractor to the Company or any Parent,  Subsidiary or Affiliate of
the  Company.  The Board of Directors of the Company  shall have  discretion  to
determine  whether  Optionee  has ceased to be  employed  by the  Company or any
Parent,  Subsidiary or Affiliate of the Company and the effective  date on which
such employment terminated (the "Termination Date").

                  (a) If  Optionee  ceases to be  employed by the Company or any
                      Parent,  Subsidiary  or  Affiliate  of the Company for any
                      reason  except death or  disability,  this Option,  to the
                      extent  (and only to the  extent)  that it would have been
                      exercisable  by Optionee on the  Termination  Date, may be
                      exercised  by  Optionee  within  three  months  after  the
                      Termination  Date;  provided  that if the  Optionee  is an
                      officer or  director  of the  Company or other  person (in
                      each  case,  an  "Insider"),  whose  transactions  in  the
                      Company's Common Stock are subject to Section 16(b) of the
                      Exchange Act of 1934, as amended (the "Exchange  Act") and
                      the  Company is subject to Section  16(b) of the  Exchange
                      Act,  the  Optionees's  option will be  exercisable  for a
                      period of time  sufficient  to prevent such  Optionee from
                      having a matching  purchase and sale under Section  16(b).
                      Any extension  beyond three (3) months from termination of
                      employment  will be  deemed  to be an NQSO.  In no  event,
                      however,  may an  Option  be  exercisable  later  than the
                      Expiration Date.

                  (b) If Optionee's  employment  with the Company or any Parent,
                      Subsidiary  or  Affiliate  of the  Company  is  terminated
                      because of the death of Optionee or disability of Optionee
                      within the meaning of Section  22(e)(3) of the Code,  this
                      Option,  to the extent that it is  exercisable by Optionee
                      on the Termination  Date, may be exercised by Optionee (or
                      Optionee's  legal  representative)

                                       2

<PAGE>


                      within twelve months after the  Termination  Date,  but in
                      any event no later than the Expiration Date.

         Nothing in this Plan or this Grant shall  confer on Optionee  any right
to continue in the employ of the Company or any Parent,  Subsidiary or Affiliate
of the  Company  or limit in any way the  right of the  Company  or any  Parent,
Subsidiary or Affiliate of the Company to terminate Optionee's employment at any
time, with or without cause.

         5.       Manner of Exercise.

                 (a) This Option shall be exercisable by delivery to the Company
                     of an executed  written  Stock Option  Exercise Form in the
                     form attached hereto as Exhibit A, or in such other form as
                     may be  approved  by the  Company,  which  shall  set forth
                     Optionee's  election to exercise this Option, the number of
                     Shares being  purchased,  any  restrictions  imposed on the
                     Shares  and  such  other   representations  and  agreements
                     regarding  Optionee's   investment  intent  and  access  to
                     information  as may be  required  by the  Company to comply
                     with applicable securities laws.

                 (b) Such Stock Option  Exercise  Form shall be  accompanied  by
                     full  payment of the  Exercise  Price for the Shares  being
                     purchased (i) in cash (by check);  (ii) where  permitted by
                     applicable  law and  approved by the  Committee in its sole
                     discretion,  by tender of a full recourse  promissory  note
                     having  such  terms as may be  approved  by the  Committee;
                     (iii) by any combination of the foregoing where approved by
                     the Committee in its sole discretion. Optionees who are not
                     employees or directors of the Company shall not be entitled
                     to purchase  Shares with a promissory  note unless the note
                     is adequately secured by collateral other than the Shares.

                 (c) Prior to the  issuance of the Shares upon  exercise of this
                     Option,  Optionee must pay or make  adequate  provision for
                     any applicable federal or state withholding  obligations of
                     the Company.

                 (d) Provided  that  such  notice  and  payment  are in form and
                     substance  satisfactory  to counsel  for the  Company,  the
                     Company  shall issue the shares  registered  in the name of
                     Optionee or Optionee's legal representative.

         6. Notice of  Disqualifying  Disposition  of ISO Shares.  If the Option
granted  to  Optionee  herein  is an ISO,  and if  Optionee  sells or  otherwise
disposes  of any of the  Shares  acquired  pursuant  to the ISO on or before the
later of (1) the date two years after the date of this  Grant,  and (2) the date
one year after  transfer of such Shares to the Optionee upon the exercise of the
ISO,  the  Optionee  shall  immediately  notify  the  Company in writing of such
disposition.  Optionee  agrees  that  Optionee  may be  subject  to  income  tax
withholding by the Company on the compensation income recognized by the Optionee
from the early  disposition  by payment in cash or out of the  current  earnings
paid to the Optionee.

                                       3

<PAGE>

         7. Compliance with Laws and  Regulations.  The issuance and transfer of
Shares shall be subject to  compliance  by the Company and the Optionee 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.  Optionee
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.

         8.  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 the Optionee only by the Optionee. The terms
of this Option shall be binding upon the executors,  administrators,  successors
and assigns of the Optionee.

         9. Tax Consequences.  Set forth below is a brief summary as of the date
of this  Option  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 adviser before exercising this Option or disposing
of the shares.

                  (a) Exercise of ISO. If this Option qualifies as an ISO, there
                      will  be  no  regular  federal  income  tax  liability  or
                      California  income tax liability  upon the exercise of the
                      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.

                  (b) Exercise of Nonqualified Stock Option. If this Option does
                      not  qualify  as an ISO,  there may be a  regular  federal
                      income tax liability and a California income tax liability
                      upon the  exercise of the  Option.  The  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  will 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.

                  (c) Disposition  of Shares.  In the case of an NQSO, if Shares
                      acquired  pursuant to the Option are held for at least one
                      year,  any gain realized on disposition of the Shares will
                      be  treated  as long term  capital  gain for  federal  and
                      California income tax purposes.  In the case of an ISO, if
                      Shares transferred  pursuant to the Option are held for at
                      least one year after exercise and are disposed of at least
                      two years  after the Date of Grant,  any gain  realized on
                      disposition  of the  Shares  will also be  treated as long
                      term  capital gain for federal and  California  income tax
                      purposes. If Shares purchased under an ISO are disposed of
                      within

                                       4
<PAGE>



                      such one year period or within two years after the Date of
                      Grant,  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.

         10.  Interpretation.  Any dispute regarding the  interpretation of this
  agreement  shall be  submitted  by Optionee or the  Company  forthwith  to the
  Company's  Board of Directors or the committee  thereof that  administers  the
  Plan,  which  shall  review  such  dispute at its next  regular  meeting.  The
  resolution  of such a  dispute  by the Board or  committee  shall be final and
  binding on the Company and on Optionee.

         11.  Entire  Agreement.  The Plan and the Stock  Option  Exercise  Form
  attached as Exhibit A are  incorporated  herein by reference.  This Grant, the
  Plan and the Stock Option Exercise Form constitute the entire agreement of the
  parties and supersede all prior  undertakings  and agreements  with respect to
  the subject matter hereof.


                                              INTEGRATED SYSTEMS, INC.

                                              By:____________________________
                                                      David St. Charles
                                                      President and CEO


                                       5
<PAGE>

                                   ACCEPTANCE

Optionee  hereby  acknowledges  receipt  of a copy of the  Plan and the Form S-8
Prospectus  relating thereto,  represents that Optionee had read and understands
the terms and provisions  thereof,  and accept this option,  Grant Number _____,
dated ______, subject to all the terms and conditions of the Plan and this Stock
Option Grant.  Optionee  acknowledges that there may be adverse tax consequences
upon  exercise of this  Option or  disposition  of the Shares and that  Optionee
should consult a tax advisor prior to such exercise or disposition.




                                            Optionee: __________________________


                                       6




                            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-

<PAGE>

                                                        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.

                                      -2-

<PAGE>

                                                        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

                                      -3-

<PAGE>

                                                        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.

                                      -4-

<PAGE>

                                                        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

                                       -5-

<PAGE>

                                                        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.

                                      -6-

<PAGE>

                                                        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-

<PAGE>

                                                        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-

<PAGE>

                                                        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-

<PAGE>

                                                        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-

<PAGE>

                                                        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-

<PAGE>

                                                        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-





                                                                    EXHIBIT 5.01

                               September 25, 1998

Integrated Systems, Inc.
201 Moffett Park Drive
Sunnyvale, California  94089

Gentlemen/Ladies:

         At your request,  we have examined the  Registration  Statement on Form
S-8 (the  "Registration  Statement")  to be filed by you with the Securities and
Exchange  Commission  (the  "Commission")  on or  about  September  28,  1998 in
connection with the  registration  under the Securities Act of 1933, as amended,
of an  aggregate  of  2,000,000  shares  of your  Common  Stock  (the  "Stock"),
1,000,000  of which are subject to  issuance  by you upon the  exercise of stock
options  granted or to be granted by you under your 1988 Stock Option  Plan,  as
amended (the "1988 Plan"), and 1,000,000 of which are subject to issuance by you
upon the  exercise of stock  options  granted or to be granted by you under your
1998 Equity  Incentive  Plan (the "1998 Plan").  The 1988 Plan and the 1998 Plan
are collectively  referred to in this letter as the "Plans").  In rendering this
opinion, we have examined the following:

         (1)      your   registration   statement   on  Form  S-8  (File  Number
                  333-12799) filed with and declared effective by the Commission
                  on September  27, 1996,  together  with the  Company's  Bylaws
                  filed as a part thereof;

         (2)      your registration  statement on Form 8-A (File Number 0-18268)
                  filed with the  Commission  on January 29, 1990, as amended by
                  Amendment  No. 1 filed with the  Commission  on March 1, 1990,
                  together  with  the  order  of  effectiveness  issued  by  the
                  Commission therefor on March 5, 1990;

         (3)      the Registration  Statement,  together with the Exhibits filed
                  as a part thereof;

         (4)      the Prospectuses  prepared in connection with the Registration
                  Statement;

         (5)      the minutes of meetings and actions by written  consent of the
                  shareholders and Board of Directors that are contained in your
                  minute books that are in our possession; and

         (6)      the stock records that you have provided to us  (consisting of
                  a letter dated  September 24, 1998 from your  transfer  agent,
                  ChaseMellon Shareholder Services, stating the number of shares
                  of your capital stock issued and  outstanding on such date and
                  a  report  of the  number  of  options  that  are  outstanding
                  respecting   your  capital  stock  and  of  any  other  rights
                  outstanding  to your purchase  capital stock that was prepared
                  by you and dated September 23, 1998).

         (7)      a  Management  Certificate  addressed  to us and dated of even
                  date  herewith  executed  by the  Company  containing  certain
                  factual and other representations.

         We have also  confirmed  the  continued  effectiveness  of the Company'
registration under the Securities Exchange Act of 1934, as amended, by telephone
call to the offices of the Commission and have confirmed your eligibility to use
Form S-8.

<PAGE>

         In our  examination of documents for purposes of this opinion,  we have
assumed,  and express no opinion as to, the  genuineness  of all  signatures  on
original  documents,  the  authenticity  of  all  documents  submitted  to us as
originals,  the  conformity  to  originals of all  documents  submitted to us as
copies,  the legal capacity of all natural persons  executing the same, the lack
of any  undisclosed  terminations,  modifications,  waivers or amendments to any
documents  reviewed by us and the due  execution  and delivery of all  documents
where due execution and delivery are prerequisites to the effectiveness thereof.

         As to matters of fact relevant to this  opinion,  we have relied solely
upon our  examination  of the  documents  referred to above and have assumed the
current  accuracy  and  completeness  of the  information  obtained  from public
officials  and  records   referred  to  above.   We  have  made  no  independent
investigation or other attempt to verify the accuracy of any of such information
or to determine the  existence or  non-existence  of any other factual  matters;
however,  we are not aware of any facts that would cause us to believe  that the
opinion expressed herein is not accurate.

         We are  admitted to  practice  law in the State of  California,  and we
express no opinion herein with respect to the  application or effect of the laws
of any jurisdiction other than the existing laws of the United States of America
and the State of California.

         Based upon the foregoing,  it is our opinion that the 2,000,000  shares
of Stock  that may be  issued  and sold by you upon the  exercise  of (a)  stock
options  granted  or to be granted  under the 1988 Plan or the 1998  Plan,  when
issued  and  sold in  accordance  with the  applicable  plan  and  stock  option
agreements to be entered into  thereunder,  and in the manner referred to in the
relevant Prospectus associated with the Registration Statement,  will be validly
issued, fully paid and nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement  and  further  consent  to  all  references  to  us,  if  any,  in the
Registration  Statement,  the  Prospectus  constituting  a part  thereof and any
amendments thereto.

         This opinion  speaks only as of its date and we assume no obligation to
update this opinion  should  circumstances  change  after the date hereof.  This
opinion is  intended  solely for the your use as an exhibit to the  Registration
Statement for the purpose of the above sale of the Stock and is not to be relied
upon for any other purpose.


                                            Very truly yours,



                                            FENWICK & WEST LLP



                                       2






                                                                   EXHIBIT 23.02




                       CONSENT OF INDEPENDENT ACCOUNTANTS


         We  consent  to the  incorporation  by  reference  in the  Registration
Statement of  Integrated  Systems,  Inc. on Form S-8 our reports dated March 26,
1998,  on our audits of the  consolidated  financial  statements  and  financial
statement schedule of Integrated Systems, Inc. as of February 28, 1997 and 1998,
and for each of the three years in the period ended  February  28,  1998,  which
reports are included in the Registrant's Annual Report on Form 10-K.


PricewaterhouseCoopers LLP


San Jose, California
September 25, 1998



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