INTEGRATED SYSTEMS INC
S-8, 1996-02-22
PREPACKAGED SOFTWARE
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As filed with the Securities and Exchange Commission on February 22, 1996
                                                   Registration  No. 33-       


                       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.)

                                 3260 Jay Street
                       Santa Clara, California 95054-3309
                    (Address of principal executive offices)

      OPTIONS GRANTED UNDER THE DOCTOR DESIGN, INC. 1991 STOCK OPTION PLAN
                     AND ASSUMED BY INTEGRATED SYSTEMS, INC.
                            (Full title of the Plan)

                                Narendra K. Gupta
                            Integrated Systems, Inc.
                                 3260 Jay Street
                       Santa Clara, California 95054-3309
                                 (408) 980-1500
            (Name, address and telephone number of agent for service)

                                   COPIES TO:
                           Katherine T. Tallman, Esq.
                                 Fenwick & West
                              Two Palo Alto Square
                           Palo Alto, California 94306

                         CALCULATION OF REGISTRATION FEE
                    ----------------------------------------

                                   Proposed        Proposed
                                    Maximum         Maximum
 Title of           Amount         Offering        Aggregate          Amount of
Securities to        to be         Price Per       Offering         Registration
be Registered     Registered         Share           Price               Fee
- --------------------------------------------------------------------------------
                                               
Common Stock      131,862(1)      $1.9279(2)      $254,217(2)        $100.00(3)
- --------------------------------------------------------------------------------

(1)   Shares subject to options assumed as of January 26, 1996.

(2)   Weighted  average per share exercise price of outstanding  options assumed
      as of January 26, 1996.

(3)   Represents the statutory minimum filing fee, which is greater than 1/29 of
      1% of $254,217.

<PAGE>
ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

         The  following   documents  filed  with  the  Securities  and  Exchange
Commission (the "Commission") are incorporated herein by reference:

         (a)     The Registrant's latest annual report filed pursuant to Section
                 13(a) or  15(d)  of the  Securities  Exchange  Act of 1934,  as
                 amended (the "Exchange  Act"), or the latest  prospectus  filed
                 pursuant to Rule 424(b) under the  Securities  Act of 1933,  as
                 amended  (the "1933  Act"),  that  contains  audited  financial
                 statements  for the  Registrant's  latest fiscal year for which
                 such statements have been filed.

         (b)     All other reports  filed  pursuant to Section 13(a) or 15(d) of
                 the  Exchange  Act since the end of the fiscal year  covered by
                 the annual report or the prospectus referred to in (a) above.

         (c)     The description of the  Registrant's  Common Stock contained in
                 the   Registrant's   registration   statement  filed  with  the
                 Commission under Section 12 of the Exchange Act,  including any
                 amendment  or report  filed for the  purpose of  updating  such
                 description.

         All documents subsequently filed by the Registrant pursuant to Sections
13(a),  13(c),  14 and  15(d) of the  Exchange  Act,  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  herein 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 as to Interests of Named Experts and Counsel.

         The  consolidated  balance  sheets as of February 28, 1994 and 1995 and
the consolidated  statements of operations,  shareholders' equity and cash flows
for each of the three  years in the period  ended  February  28,  1995,  and the
related  financial  statement  schedules   incorporated  by  reference  in  this
Registration  Statement and appearing in Registrant's Annual Report on Form 10-K
filed May 25,  1995  (File  Number  0-18268)  have been  incorporated  herein in
reliance upon the report of Coopers & Lybrand  L.L.P.,.independent  accountants,
given upon the authority of that firm as experts in accounting and auditing.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         The  provisions  of Section 317 of the  California  Corporations  Code,
Article VI of the Registrant's  Articles of Incorporation  and Article VI of the
Registrant's By-laws 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

                                      -1-
<PAGE>
director or officer of the  Registrant.  The  Registrant's  directors  have also
entered into Indemnity  Agreements  with the Registrant that give such directors
contractual  assurances regarding the scope of the indemnification and liability
limitations set forth in the Registrant's Articles of Incorporation and By-laws.
The indemnification  may be sufficiently broad to permit  indemnification of the
Registrant's  officers and directors for liabilities arising under the 1933 Act.
In addition,  Article V of the Registrant's  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 with a per annum policy limit of  $1,000,000,  all claims and  coverages,
and a deductible of $100,000 per annum.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

         Not applicable.

ITEM 8.  EXHIBITS.

The following exhibits are filed herewith:

         4.01      Registrant's Amended and Restated Articles of Incorporation.

         4.02      Registrant's  Bylaws,  as  amended to date  (incorporated  by
                   reference to Exhibit 3.03 to the  Registrant's  Form 10-Q for
                   the quarter ended August 31, 1993).

         4.03      Doctor Design, Inc. 1991 Stock  Option  Plan, as  amended  to
                   date.

         5.01      Opinion of Fenwick & West.

         23.01     Consent of Fenwick & West (included in Exhibit 5.01).

         23.02     Consent of Coopers & Lybrand L.L.P.

         24.01     Power of Attorney (see page 4).

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:

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

                         (ii) 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  thereof)  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; and

                                      -2-
<PAGE>
                         (iii) 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)(i) and (1)(ii) above 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 to
the Commission by the Registrant  pursuant to Section 13 or Section 15(d) of the
Exchange Act that are incorporated by reference in the Registration Statement.

                (2) That, for the purpose of determining any liability under the
Securities Act, 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  that remain  unsold at the
termination of the offering.

         The  undersigned  Registrant  hereby  undertakes  that, for purposes of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
Registrant's  annual  report  pursuant to Section  13(a) or Section 15(d) of the
Exchange Act (and, where  applicable,  each filing of an employee benefit plan's
annual  report   pursuant  to  Section  15(d)  of  the  Exchange  Act)  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.

         Insofar as indemnification for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
Registrant pursuant to the provisions  discussed in Item 6 hereof, or otherwise,
the  Registrant  has been  advised  that in the opinion of the  Commission  such
indemnification  is against public policy as expressed in the Securities 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 hereby, 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 Securities Act and will be governed by
the final adjudication of such issue.

                                      -3-

<PAGE>
                                POWER OF ATTORNEY

         KNOW ALL MEN BY THESE  PRESENTS that each  individual  and  corporation
whose signature  appears below  constitutes  and appoints  Narendra K. Gupta and
Steven   Sipowicz,   and  each  of  them,  his,  her  or  its  true  and  lawful
attorneys-in-fact and agents with full power of substitution, for him, her or it
and in his, her or its name, place and stead, in any and all capacities, to sign
any  and  all   amendments   (including   post-effective   amendments)  to  this
Registration  Statement  on Form  S-8,  and to file the same  with all  exhibits
thereto and all  documents in  connection  therewith,  with the  Securities  and
Exchange Commission,  granting unto 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 and about the  premises,  as fully to all
intents  and  purposes  as he,  she or it might or  could do in  person,  hereby
ratifying and  confirming all that said  attorneys-in-fact  and agents or any of
them, or his, her, its or their  substitute or  substitutes,  may lawfully do or
cause to be done by virtue hereof.


                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
Registrant 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 Santa Clara, State of California, on this 22nd day of
February, 1996.

                                            INTEGRATED SYSTEMS, INC.


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

<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
                ---------                                  -----                              ----
<S>                                         <C>                                       <C>
PRINCIPAL EXECUTIVE OFFICERS:

/s/ Naren Gupta                             Secretary and Chairman of the Board of    February 22, 1996
- ------------------------------------
Narendra K. Gupta                           Directors

/s/ David P. St. Charles                    President, Chief Executive Officer and    February 22, 1996
- ------------------------------------
David P. St. Charles                        Director

PRINCIPAL FINANCIAL OFFICER AND PRINCIPAL ACCOUNTING OFFICER:

/s/ Steven Sipowicz                         Vice President, Finance and               February 22, 1996
- ------------------------------------
Steven Sipowicz                             Chief Financial Officer

                                      -4-
<PAGE>

ADDITIONAL DIRECTORS:

                                            Director                                  February 22, 1996
- ---------------------------
John C. Bolger

/s/ Vinita Gupta                            Director                                  February 22, 1996
- ---------------------------
Vinita Gupta

                                            Director                                  February 22, 1996
- ---------------------------
Thomas Kailath

/s/ Richard C. Murphy                       Director                                  February 22, 1996
- ---------------------------
Richard C. Murphy

</TABLE>

                                      -5-
<PAGE>

                                  Exhibit Index


Exhibit                                                         Description


4.01            Registrant's Amended and Restated Articles of Incorporation.

4.02            Registrant's  Bylaws,  as  amended  to date  (incorporated  by
                reference  to Exhibit 3.03 to the  Registrant's  Form 10-Q for
                the quarter ended August 31, 1993).

4.03            Doctor Design, Inc. 1991 Stock Option Plan, as amended to date.

5.01            Opinion of Fenwick & West.

23.01           Consent of Fenwick & West (included in Exhibit 5.01).

23.02           Consent of Coopers & Lybrand L.L.P.

24.01           Power of Attorney (see page 4).


                                      -6-


                                                                    EXHIBIT 4.01

                 AMENDED AND RESTATED ARTICLES OF INCORPORATION

                                       OF

                            INTEGRATED SYSTEMS, INC.

Narendra K. Gupta certifies that:

         1.       He is the president and secretary of Integrated Systems, Inc.,
a California corporation.

         2.       The Articles of Incorporation of this corporation are  amended
and restated to read as follows:

         I.       The name of this Corporation is Integrated Systems, Inc.

         II. The purpose of this  Corporation  is to engage in any lawful act or
activity for which a corporation may be organized under the General  Corporation
Law of California other than the banking business, the trust company business or
the practice of a  profession  permitted to be  incorporated  by the  California
Corporations Code.

         III. 1.  AUTHORIZATION  OF SHARES.  This  Corporation  is authorized to
issue two  classes of stock to be  designated,  respectively,  Common  Stock and
Preferred  Stock,  both  without  par value.  The total  number of shares of all
classes which the Corporation is authorized to issue is 30,000,000  shares.  The
number of shares of Common Stock authorized is 25,000,000  shares and the number
of shares of Preferred  Stock  authorized  is 5,000,000  shares of which 672,322
shares  are  presently  designated  as  Series  A  Convertible  Preferred  Stock
("Convertible  Preferred  Stock").  The  rights,  preferences,   privileges  and
restrictions  granted  to and  imposed  upon the  Common  Stock and  Convertible
Preferred Stock are set forth below in Article IV.

                  2.  DESIGNATION  OF UNISSUED  SERIES OF PREFERRED  STOCK.  The
Preferred  Stock  may be  divided  into  such  number  of series as the board of
directors  may  determine.  The  board  of  directors  of  the  Corporation  may
designate,  fix the  number  of  shares of and  determine  or alter the  rights,
preferences,  privileges and restrictions granted to or imposed upon, any series
of  Preferred  Stock as to which  there are no  outstanding  shares or rights to
acquire shares (including the Convertible  Preferred Stock which becomes so as a
result of  conversion  of all  outstanding  shares of such  series  pursuant  to
Article IV, Section 5 hereof).  As to any series of Preferred  Stock, the number
of shares of which is  authorized  to be fixed by the  board of  directors,  the
board may, within any limits and  restrictions  stated in the resolutions of the
board originally fixing the number of shares constituting such series,  increase
or decrease (but not below the number of shares of such series then  outstanding
and as to which  rights to acquire  shares of such series are then  outstanding)
the  number of shares of any such  series  subsequent  to the issue of shares of
that series.

         IV.      The relative rights, preferences, privileges and  restrictions
granted to or imposed upon the Common  Stock and the Convertible Preferred Stock
are as follows:

                  1.  DIVIDENDS.

                      (a)   No dividends shall be declared and set aside for any
shares of the Convertible  Preferred Stock except in the event that the Board of
Directors  of the  Corporation  shall  declare a dividend  payable upon the then
outstanding shares of the Common Stock, in which event the holders of each share
of  Convertible  Preferred  Stock  shall be entitled to be paid a dividend in an
amount  per share of  Convertible  Preferred  Stock  equal to the  amount of the
dividend   declared  payable  upon  each  outstanding  share  of  Common  Stock,
multiplied by the largest number of whole shares of Common Stock into which each
share of  Convertible  Preferred  Stock  held by each  holder  thereof  could be
converted pursuant to the provisions of Section 5 hereof, such number determined
as of the record date for the  determination of holders of Common Stock entitled
to receive such dividend.

                                      -1-
<PAGE>

                      (b)   Each holder of shares of Convertible Preferred Stock
shall be deemed to have consented (i) for purposes of Sections 502, 503, and 506
of the California Corporations Code, and (ii) with respect to the rights of each
such holder of Convertible Preferred Stock to receive distributions  pursuant to
Sections 1, 2 and/or 4(h) herein,  to  distributions  made by the Corporation in
connection  with the  repurchase  of  shares  of Common  Stock  from  employees,
officers,  directors,  consultants, or other persons performing services for the
Corporation or any subsidiary upon  termination of their  employment or services
pursuant to agreements providing for the right of repurchase.

                  2.  LIQUIDATION, DISSOLUTION OR WINDING UP.

                      (a)  In the  event  of any  liquidation,  dissolution  or 
winding up of the Corporation, whether voluntary or involuntary, holders of each
share of Convertible  Preferred Stock then  outstanding  shall be entitled to be
paid first out of the assets of the  Corporation  available for  distribution to
the holders of the  Corporation's  capital  stock of all  classes,  whether such
assets are capital,  surplus, or earnings,  before any sums shall be paid or any
assets  distributed  among the holders of shares of Common  Stock,  in an amount
equal to the  greater of (i) $1.4874 per share of  Convertible  Preferred  Stock
plus all dividends  thereon,  if any,  payable  pursuant to Section 1, up to and
including the date of full payment,  or (ii) the amount per share of Convertible
Preferred  Stock that  would have been  payable  had each such  share,  plus all
dividends  thereon,  if any,  payable  pursuant to Section 1, been  converted to
Common Stock  immediately  prior to such event of  liquidation,  dissolution  or
winding up pursuant to the  provisions of Section 4 hereof,  up to and including
the date of full  payment,  all such sums shall be paid before any sums shall be
paid or any assets  distributed among the holders of the shares of Common Stock.
If the assets of the Corporation  shall be insufficient to permit the payment in
full to the  holders  of the  Convertible  Preferred  Stock of the  amount  thus
distributable,  then the entire  assets of the  Corporation  available  for such
distribution  shall be distributed  ratably among the holders of the Convertible
Preferred Stock.  After such payment shall have been made in full to the holders
of the  Convertible  Preferred  Stock or funds  necessary for such payment shall
have been set aside by the  Corporation  in trust for the  account of holders of
the Convertible Preferred Stock so as to be available for such payment,  holders
of the Convertible Preferred Stock shall be entitled to no further participation
in the  distribution  of the assets of the Corporation and shall have no further
rights of conversion,  and the remaining assets available for distribution shall
be distributed ratably among the holders of the Common Stock.

                      (b)  A consolidation or merger of the Corporation in which
the  holders of all capital  stock of the  Corporation  outstanding  immediately
prior to such a consolidation or merger hold less than two-thirds of the capital
stock of the surviving entity to such  consolidation or merger, or a sale of all
or substantially  all of the assets of the  Corporation,  shall be regarded as a
liquidation,  dissolution or winding up of the affairs of the Corporation within
the  meaning  of  this  Section  2;  provided,  however,  that  each  holder  of
Convertible  Preferred  Stock shall have the right to elect the  benefits of the
provisions of Section 4(h) hereof in lieu of receiving  payment in  liquidation,
dissolution  or  winding  up of the  Corporation  pursuant  to this  Section  2;
provided,  further,  that  in  the  event  a  consolidation  or  merger  of  the
Corporation or sale of all or substantially all of the assets of the Corporation
in which the aggregate  consideration payable to the holders of capital stock of
the  Corporation  is less  than or equal to  $2,850,000,  is to be  regarded  as
liquidation,  dissolution  or  winding up  pursuant  to the terms  hereof,  then
notwithstanding  Section 2(a) hereof, the holders of Convertible Preferred Stock
shall be entitled to receive an amount equal to $1.4874 per share  multiplied by
a fraction the numerator of which is the total amount of  consideration  payable
to the holders of capital stock of the  Corporation and the denominator of which
is $2,850,000.

                      (c)   Whenever the distribution  provided for herein shall
be paid in property other than cash, the value of such distribution shall be the
fair market value of such  property as  determined in good faith by the Board of
Directors of the Corporation.

                                      -2-
<PAGE>
                  3. VOTING POWER.  Each holder of Convertible  Preferred  Stock
shall be entitled  to that number of votes equal to the largest  number of whole
shares of Common Stock into which such holder's shares of Convertible  Preferred
Stock could be converted, pursuant to the provisions of Section 4 hereof (taking
into account all dividends,  if any,  payable pursuant to Section 1 with respect
to such Convertible  Preferred  Stock), at the record date for the determination
of  shareholders  entitled  to vote on such matter or, if no such record date is
established,  at the  date  such  vote  is  taken  or  any  written  consent  of
shareholders is solicited.  Except as otherwise  expressly provided in Section 6
herein or as required by law, (i) the holders of shares of Convertible Preferred
Stock and Common  Stock  shall be  entitled  to vote  together as a class on all
matters and (ii) the holders of shares of Convertible Preferred Stock shall have
no rights to vote as a separate class on any corporate matters.

                  4.  CONVERSION  RIGHTS.   The   holders  of  the   Convertible
Preferred  Stock  shall  have  the  following conversion rights:

                      (a)   General.

                            (i)   Subject  to   and  in  compliance   with   the
provisions of this Section 4, any shares of the Convertible Preferred Stock and,
at the option of the holder, all dividends thereon,  if any, payable pursuant to
Section 1, up to and including the date of conversion, may, at the option of the
holder,  be  converted  at any time or from  time to time  into  fully-paid  and
nonassessable  shares  (calculated as to each conversion  rounded upwards to the
largest  whole share) of Common  Stock.  The number of shares of Common Stock to
which a holder of Convertible  Preferred Stock shall be entitled upon conversion
shall be the product  obtained by multiplying the "Applicable  Conversion  Rate"
(determined  as provided in Section 4(c)) by the number of shares of Convertible
Preferred Stock being converted.

                            (ii)    Notwithstanding  the foregoing,  the holders
of  Convertible  Preferred  Stock  shall  have the right to  convert  all or any
portion of any dividends payable pursuant to Section 1 hereunder, into shares of
Common Stock at any time upon written notice to the  Corporation.  The number of
shares of Common Stock issuable upon any such conversion  shall be the number of
shares equal to the amount of the unpaid  dividends being so converted  dividend
by the "Applicable Conversion Value" then in effect,  (determined as provided in
Section 4(d) hereof.)  Upon receipt of any such notice,  the  Corporation  shall
promptly issue a certificate in the name of the holder of Convertible  Preferred
Stock for the  number of shares of Common  Stock so  issuable,  together  with a
check representing cash in lieu of any fractional share.

                      (b)  Conversion Following Underwritten Public Offering.

                            (i) All outstanding shares of Convertible  Preferred
Stock and, at the option of the holder, all dividends  thereon,  if any, payable
pursuant to Section 1, up to and including the date of conversion, shall, at the
option of the  Corporation  and upon ten (10) days written notice to the holders
thereof be converted  automatically into the number of shares of Common Stock to
which a holder of Convertible  Preferred Stock shall be entitled upon conversion
pursuant to Section 4(a) hereof  without any further  action by such holders and
whether or not the certificates  representing such shares are surrendered to the
Corporation  or its transfer agent for the Common Stock,  such  conversion to be
effective only upon the closing of an underwritten  public offering  pursuant to
an  effective  registration  statement  under  the  Securities  Act of 1933,  as
amended,  covering  the offer and sale of Common  Stock for the  account  of the
Corporation  in which the  Common  Stock is sold at a price to the public of not
less than  $5.00 per share  (such per share  amounts  to be  equitably  adjusted
whenever there shall occur a stock split, combination, reclassification or other
similar  event  affecting  the  Common  Stock)  and in which the  aggregate  net
proceeds to the Corporation exceed $7,000,000.

                                      -3-
<PAGE>
                            (ii)    Upon   the   occurrence  of  the  conversion
specified in Section 4(b)(i),  the holders of such  Convertible  Preferred Stock
shall surrender the certificates  representing  such shares at the office of the
Corporation  or of its transfer  agent for the Common  Stock.  Thereupon,  there
shall be issued and delivered to such holder a certificate or  certificates  for
the number of shares of Common  Stock  into which the shares of the  Convertible
Preferred  Stock  surrendered  were  convertible  on  the  date  on  which  such
conversion   occurred.   The  Corporation   shall  not  be  obligated  to  issue
certificates evidencing the shares of Common Stock issuable upon such conversion
unless  certificates  evidencing such shares of the Convertible  Preferred Stock
being  converted are either  delivered to the  Corporation  or any such transfer
agent or the holder  notifies the  Corporation  or any such transfer  agent that
such  certificates have been lost, stolen or destroyed and executes an agreement
satisfactory  to the  Corporation  to indemnify  the  Corporation  from any loss
incurred by it in connection therewith.

                      (c)   Applicable  Conversion  Rate.  The  conversion  rate
in effect at any time (the "Applicable  Conversion  Rate") shall be the quotient
obtained  by dividing  the sum of (i)  $1.4874  and (ii) at the  election of the
holder, an amount equal to the amount of unpaid dividends,  if any, per share of
Convertible  Preferred Stock,  payable pursuant to Section 1, by the "Applicable
Conversion Value," calculated as, provided in Section 4(d).

                      (d)   Applicable   Conversion  Value.   The   " Applicable
Conversion  Value" in effect from time to time, except as adjusted in accordance
with Section 4(e) hereof, shall be $1.4874.

                      (e)   Adjustments to Applicable  Conversion  Value.   Upon
the happening of an "Extraordinary Common Stock Event" (as hereinafter defined),
the Applicable Conversion Value shall, simultaneously with the happening of such
Extraordinary  Common Stock Event, be adjusted by multiplying the then effective
Applicable  Conversion Value by a fraction,  the numerator of which shall be the
number  of  shares  of  Common  Stock  outstanding  immediately  prior  to  such
Extraordinary  Common  Stock  Event and the  denominator  of which  shall be the
number  of  shares  of  Common   Stock   outstanding   immediately   after  such
Extraordinary  Common Stock Event,  and the product so obtained shall thereafter
be the Applicable  Conversion  Value.  The Applicable  Conversion  Value,  as so
adjusted,  shall be  readjusted  in the same  manner upon the  happening  of any
successive Extraordinary Common Stock Events.

                      "Extraordinary  Common  Stock  Event"  shall  mean (i) the
issue  of  additional  shares  of  the  Common  Stock  as a  dividend  or  other
distribution on outstanding Common Stock, (ii) subdivision of outstanding shares
of Common Stock into a greater  number of shares of the Common  Stock,  or (iii)
combination of  outstanding  shares of the Common Stock into a smaller number of
shares of the Common Stock.

                      (f)   Dividends. In the event the Corporation  shall  make
or issue, or fix a record date for the  determination of holders of Common Stock
entitled to receive a dividend or other  distribution  payable in  securities of
the Corporation  other than shares of Common Stock or in assets  (excluding cash
dividends or distributions), and the holders of Convertible Preferred Stock have
not  received  such  dividend  or  distribution,  then  and in each  such  event
provision shall be made so that the holders of Convertible Preferred Stock shall
receive  upon  conversion  thereof in addition to the number of shares of Common
Stock receivable thereupon, the number of securities or such other assets of the
Corporation that they would have received had their Convertible  Preferred Stock
been  converted  into  Common  Stock  on the  date of such  event  and had  they
thereafter,  during the period from the date of such event to and  including the
Conversion  Date (as that term is hereafter  defined in Section 4(j)),  retained
such securities or such other assets receivable by them as aforesaid during such
period,  giving  application  to all  adjustments  called for during such period
under  this  Section  4  with  respect  to the  rights  of  the  holders  of the
Convertible Preferred Stock.

                                      -4-
<PAGE>
                      (g)   Recapitalization or Reclassification.  If the Common
Stock issuable upon the conversion of the  Convertible  Preferred Stock shall be
changed into the same or  different  number of shares of any class or classes of
stock of the  Corporation,  whether  by  recapitalization,  reclassification  or
otherwise  (other than a subdivision  or combination of shares or stock dividend
provided  for  elsewhere  in  this  Section  4,  or  a  reorganization,  merger,
consolidation  or sale of assets provided for elsewhere in this Section 4), then
and in each such event the holder of each share of Convertible  Preferred  Stock
shall have the right  thereafter  to convert such share into the kind and amount
of shares  of stock  and other  securities  and  property  receivable  upon such
reorganization,  reclassification  or other  change by  holders of the number of
shares of Common  Stock into which such  share of  Convertible  Preferred  Stock
might have been converted (taking into account all dividends payable pursuant to
Section 1 with respect to such Convertible Preferred Stock) immediately prior to
such  reorganization,   reclassification  or  change,  all  subject  to  further
adjustment as provided herein.

                      (h)   Capital  Reorganization,  Merger or Sale of  Assets.
If at any time or from time to time there shall be a capital  reorganization  of
the Common Stock (other than a  subdivision,  combination,  reclassification  or
exchange of shares  provided  for  elsewhere  in this  Section 4) or a merger or
consolidation of the Corporation with or into another  corporation,  or the sale
of all or substantially  all of the  Corporation's  properties and assets to any
other person, then, as a part of such reorganization,  merger,  consolidation or
sale,  provision shall be made so that the holders of the Convertible  Preferred
Stock shall thereafter be entitled to receive upon conversion of the Convertible
Preferred  Stock,  the number of shares of stock or other securities or property
of the Corporation,  or of the successor corporation resulting from such merger,
consolidation  or  sale,  to  which a  holder  of  Common  Stock  issuable  upon
conversion  would have been  entitled on such  capital  reorganization,  merger,
consolidation,  or sale. In any such case,  appropriate adjustment shall be made
in the  application  of the  provisions  of this  Section 4 with  respect to the
rights  of  the   holders  of  the   Convertible   Preferred   Stock  after  the
reorganization,  merger, consolidation or sale to the end that the provisions of
this Section 4 (including  adjustment of the Applicable Conversion Value then in
effect and the number of shares  purchasable  upon conversion of the Convertible
Preferred Stock) shall be applicable after that event in as nearly  equivalent a
manner as may be practicable.

                      Each   holder  of  Convertible  Preferred  Stock  upon the
occurrence  of  a  capital  reorganization,   merger  or  consolidation  of  the
Corporation,  or the sale of all or substantially  all its assets and properties
as such events are more fully set forth in the first  paragraph  of this Section
4(h), shall have the option of electing  treatment of his Convertible  Preferred
Stock under either this  Section  4(h) or Section  2(b) hereof,  notice of which
election  shall be  submitted  in writing to the  Corporation  at its  principal
offices no later than five (5) days before the effective date of such event.

                      (i)    Accountant's Certificate as to Adjustments. In each
case of an adjustment or  readjustment  of the Applicable  Conversion  Rate, the
Corporation  will  furnish  each holder of  Convertible  Preferred  Stock with a
certificate,  prepared by independent public accountants of recognized  standing
showing such  adjustment or  readjustment,  and stating in detail the facts upon
which such adjustment or readjustment is based.

                      (j)    Exercise  of  Conversion  Privilege.  To   exercise
his  conversion  privilege,  a  holder  of  Convertible  Preferred  Stock  shall
surrender  the  certificate  or  certificates   representing  the  shares  being
converted to the  Corporation  at its principal  office,  and shall have written
notice to the Corporation at that office that such holder elects to convert such
share.  Such  notice  shall  also state the name or names  (with the  address or
addresses) in which the certificate or  certificates  for shares of Common Stock
issuable upon such conversion shall be issued. The date on which the certificate
or  certificates  for shares of  Convertible  Preferred  Stock  surrendered  for
conversion (accompanied by proper assignment thereof) is

                                      -5-
<PAGE>
received  by the  Corporation,  shall be the  "Conversion  Date." As promptly as
practicable  after  theConversion  Date, the  Corporation  shall issue and shall
deliver  to the  holder  of the  shares of  Convertible  Preferred  Stock  being
converted,  or on its written order,  such certificate or certificates as it may
request  for the  number  of whole  shares  of Common  Stock  issuable  upon the
conversion of such shares of Convertible  Preferred Stock in accordance with the
provisions  of this  Section  4, cash in the  amounts of all  dividends  payable
pursuant to Section 1 on such shares of Convertible  Preferred  Stock, up to and
including the Conversion Date, and cash, as provided in Section 4(k), in respect
of any fraction of a share of Common Stock issuable upon such  conversion.  Such
conversion shall be deemed to have been effected  immediately prior to the close
of business on this  Conversion  Date, and at such time the rights of the holder
as holder of the converted shares of Convertible Preferred Stock shall cease and
the person or persons in whose name or names any certificate or certificates for
shares of Common Stock shall be issuable upon such conversion shall be deemed to
have  become  the  holder or  holders  of record of the  shares of Common  Stock
represented thereby.

                      (k)   Cash  in  Lieu of Fractional  Shares. No  fractional
shares of Common Stock or scrip  representing  fractional shares shall be issued
upon the conversion of shares of  Convertible  Preferred  Stock.  Instead of any
fractional  shares of Common  Stock  which  would  otherwise  be  issuable  upon
conversion of Convertible  Preferred  Stock,  the  Corporation  shall pay to the
holder of the shares of Convertible Preferred Stock which were converted, a cash
adjustment in respect of such fractional  shares in an amount as determined in a
reasonable  manner prescribed by the Board of Directors at the close of business
on the Conversion  Date. The  determination  as to whether or not any fractional
shares  are  issuable  shall be  based  upon  the  total  number  of  shares  of
Convertible  Preferred  Stock  being  converted  at any one  time by any  holder
thereof, not upon each share of Convertible Preferred Stock being converted.

                      (l)    Partial  Conversion. In the event  some but not all
of the shares of  Convertible  Preferred  Stock  represented by a certificate or
certificates  surrendered  by a holder  are  converted,  the  Corporation  shall
execute  and  deliver to or on the order of the  holder,  at the  expense of the
Corporation,  a new certificate representing the number of shares of Convertible
Preferred Stock which were not converted.

                      (m)    Reservation of Common Stock. The Corporation  shall
at all times  reserve and keep  available  out of its  authorized  but  unissued
shares of Common Stock,  solely for the purpose of effecting  the  conversion of
the shares of the  Convertible  Preferred  Stock,  such  number of its shares of
Common stock as shall from time to time be sufficient  to effect the  conversion
of all outstanding shares of the Convertible Preferred Stock, and if at any time
the  number of  authorized  but  unissued  shares of Common  Stock  shall not be
sufficient  to  effect  the  conversion  of all then  outstanding  shares of the
Convertible Preferred Stock, the Corporation shall take such corporate action as
be necessary to increase its authorized  but unissued  shares of Common Stock to
such number of shares as shall be sufficient for purpose.

                  5.   CANCELLATION  OF  PREFERRED  STOCK  ON  CONVERSION.   All
certificates of the Convertible Preferred Stock surrendered for conversion shall
be  appropriately  canceled on the books of the  Corporation,  and the shares so
converted  represented by such  certificates  shall be restored to the status of
authorized but unissued  Preferred Stock of the Corporation,  undesignated as to
series and subject to designation  by the Board of Directors of the  Corporation
pursuant to Article III, Section 2 hereof.

                  6.   RESTRICTIONS AND LIMITATIONS.

                      (a)   Except as expressly provided  herein or as  required
by  law,  so  long as any  shares  of the  Convertible  Preferred  Stock  remain
outstanding,  the  Corporation  shall not,  and shall not permit any  subsidiary
(which  shall mean  corporation  or trust of which the  Corporation  directly or
indirectly owns at the time all of the outstanding shares of every class of such
corporation or trust other than directors'  qualifying  shares) without the vote
or written consent by the holders of at least 51% of the then outstanding shares
of the Convertible Preferred Stock (each share of Convertible Preferred Stock to
be entitled to one vote in each instance) to:

                                      -6-
<PAGE>
                            (i)Redeem, purchase or otherwise  acquire  for value
(or pay into or set  aside for a sinking  fund for such  purpose),  any share or
shares of Convertible Preferred Stock; or

                            (ii)    Authorize  or issue, or  obligate  itself to
authorize or issue,  any other equity security senior to or on a parity with the
Convertible  Preferred Stock as to liquidation  preference,  conversion  rights,
voting rights or otherwise.

                      (b)   The  Corporation  shall  not amend  its Articles  of
Incorporation  without the approval by vote or written consent by the holders of
at least 51% of the then outstanding shares of Convertible Preferred Stock, each
share  of  Convertible  Preferred  Stock  to be  entitled  to one  vote  in each
instance,  if  such  amendment  would  change  any of the  rights,  preferences,
privileges of or  limitations  provided for herein for the benefit of any shares
of  Convertible  Preferred  Stock.  Without  limiting the generality of the last
preceding sentence, the Corporation will not amend its Articles of Incorporation
without  the  approval  by the  holders of at least 51% of the then  outstanding
shares of Convertible Preferred Stock if such amendment would:

                            (i)    Change the relative  seniority  rights of the
holders  of  Convertible  Preferred  Stock as to the  payment  of  dividends  in
relation to the holders of any other capital stock of the Corporation; or

                            (ii)    Reduce  the amount  payable  to the  holders
of Convertible  Preferred  Stock upon the voluntary or involuntary  liquidation,
dissolution or winding up of the Corporation,  or change the relative  seniority
of the liquidation  preferences of the holders of Convertible Preferred Stock to
the rights upon  liquidation  of the holders of any other  capital  stock of the
Corporation  or  change  the  dividend  rights  of the  holders  of  Convertible
Preferred Stock; or

                            (iii)   Cancel or  modify the  conversion  rights of
the holders of Convertible Preferred Stock provided for in Section 4 herein.

                  7. NO DILUTION OR  IMPAIRMENT.  The  Corporation  will not, by
amendment  of its  Articles  of  Incorporation  or through  any  reorganization,
transfer  of  assets,  consolidation,  merger,  dissolution,  issue  or  sale of
securities or any other voluntary action,  avoid or seek to avoid the observance
or performance of any of the terms of the Convertible  Preferred Stock set forth
herein,  but will at all times in good faith  assist in the  carrying out of all
terms and in the taking of all action that may be  necessary or  appropriate  in
order to protect the rights of the holders of the  Convertible  Preferred  Stock
against  dilution or other  impairment.  Without  limiting the generality of the
foregoing,  the  Corporation  (a) will take all action that may be  necessary or
appropriate  in order that the  Corporation  may validly and legally issue fully
paid  and  nonassessable  shares  of  stock  on the  conversion  of  Convertible
Preferred Stock from time to time outstanding;  and (b) will not transfer all or
substantially all of its properties and assets to any other person (corporate or
otherwise),  or  consolidate  with or merge into any other  person or permit any
such  person  to  consolidate  with  or  merge  into  the  Corporation  (if  the
Corporation  is not the  surviving  person),  unless  such  other  person  shall
expressly  agree in  writing  to be bound  by all the  terms of the  Convertible
Preferred Stock set forth herein.

                  8.  NOTICES OF RECORD DATE.  In the event of

                      (a)     any taking by the  Corporation  of a record of the
holders of any class of securities  for the purpose of  determining  the holders
thereof who are entitled to receive any dividend or other  distribution,  or any
right to subscribe for, purchase or otherwise acquire any shares of stock of any
class or any other securities or property, or to receive any other right, or

                                      -7-
<PAGE>
                      (b)    any capital reorganization of the Corporation,  any
reclassification  or  recapitalization  of the capital stock of the Corporation,
any merger,  or  consolidation  of the  Corporation,  or any  transfer of all or
substantially all of the assets of the Corporation to any other corporation,  or
any other entity or person, or

                      (c)  any voluntary or involuntary dissolution, liquidation
or winding up of the  Corporation,  then and in each such event the  Corporation
shall mail or cause to be mailed to each holder of Convertible Preferred Stock a
notice  specifying  (i) the date on which any such record is to be taken for the
purpose  of such  dividend,  distribution  or right  and a  description  of such
dividend, distribution or right, (ii) the date on which any such reorganization,
reclassification,    recapitalization,    transfer,    consolidation,    merger,
dissolution,  liquidation or winding up is expected to become  effective,  (iii)
the time,  if any,  that is to be  fixed,  as to when the  holders  of record of
Common Stock (or other securities) shall be entitled to exchange their shares of
Common Stock (or other securities) for securities or other property  deliverable
upon  such   reorganization,   reclassification,   recapitalization,   transfer,
consolidation, merger, dissolution, liquidation or winding up. Such notice shall
be mailed at least 30 days prior to the date  specified  in such notice on which
such  dividend  or  other  distribution  or right  is to be  distributed  or any
reorganization,  reclassification,  recapitalization,  transfer,  consolidation,
merger, dissolution, liquidation or winding up is to be consummated.

         V.       The liability of the directors of the corporation for monetary
damages shall be eliminated to the fullest extent  permissible  under California
law.

         VI. The corporation is authorized to provide  indemnification of agents
(as defined in Section 317 of the  California  Corporations  Code) through bylaw
provisions,  by  agreement  or  otherwise,  in  excess  of  the  indemnification
otherwise permitted by Section 317 of the California  Corporations Code, subject
only to the limits on such  excess  indemnification  set forth in Section 204 of
the California Corporations Code.

         VII. This Corporation shall not have cumulative voting.  This provision
shall become effective only when this Corporation  becomes a listed  corporation
within the meaning of Section 301.5 of the California Corporations Code.

         3.       The  foregoing  amendment and restatement  of the  Articles of
Incorporation  has  been  duly  approved  by the  Board  of  Directors  of  this
corporation.

         4.  The  foregoing   amendment  and  restatement  of  the  Articles  of
Incorporation has been duly approved by the required vote of the shareholders in
accordance with Sections 902 and 903 of the California  Corporations  Code. This
Corporation  has two  classes of shares of capital  stock  outstanding;  and the
number of  outstanding  shares of Common  Stock is  5,908,720  and the number of
outstanding  shares of Preferred Stock is 672,322.  The percentage vote required
was more than 50% of each  class and of the  outstanding  shares.  The number of
shares  voting in favor of the  amendment  and  restatement  of the  Articles of
Incorporation equaled or exceeded the vote required for each class of shares and
for the outstanding shares.

         I further  declare under penalty of perjury under the laws of the State
of California  that I have read the foregoing  Certificate and know the contents
thereof and that the matters set forth in this  Certificate are true and correct
of my knowledge.




                                      /s/ Naren K. Gupta
                                      ------------------------------------------
Date:  January 23, 1990               Narendra K. Gupta, President and Secretary
               
                                      -8-
<PAGE>
                               STATE OF CALIFORNIA

                               SECRETARY OF STATE

                               CORPORATE DIVISION




         I, BILL JONES,  Secretary of State of the State of  California,  hereby
certify:

         That the annexed transcript has been compared with the corporate record
on file in this  office,  of which it  purports  to be a copy,  and that same is
full, true and correct.




                                        IN   WITNESS   WHEREOF,   I
                                        execute  this   certificate
                                        and affix the Great Seal of
                                        the  State  of   California
                                        this February 7, 1996


                                        /s/ Bill Jones
                                        --------------------------------
                                        Secretary of State


                                      -9-
<PAGE>

                               AGREEMENT OF MERGER
                          OF ISI PURCHASING CORPORATION
                                       AND
                                DR. DESIGN, INC.


         This  Agreement  of Merger  (this  "Agreement")  is entered  into as of
January  26,  1996  by  and  between  ISI  Purchasing  Corporation,  a  Delaware
corporation ("Newco") and a wholly-owned subsidiary of Integrated Systems, Inc.,
a  California  corporation  ("Buyer"),   and  Dr.  Design,  Inc.,  a  California
corporation (the "Company").

RECITALS

         A. Buyer,  Newco and Company have entered into an Agreement and Plan of
Reorganization,  dated as of  December  14,  1995 (the  "Plan"),  providing  for
certain  representations,  warranties  and  agreements  in  connection  with the
transactions contemplated hereby, in accordance with the General Corporation Law
of California (the "California  Law"). All capitalized  terms not herein defined
shall have the meaning ascribed to them in the Plan.

         B. The Boards of Directors of Buyer,  Newco and Company have determined
it to be advisable  and in the  respective  best  interests of Buyer,  Newco and
Company  and their  respective  shareholders  that Newco be merged with and into
Company (the "Merger") so that Company will be the surviving  corporation of the
Merger.

         NOW, THEREFORE, Newco and Company hereby agree as follows:

1.       THE MERGER

         At the  time  of the  filing  of  this  Agreement  (together  with  the
Officers'  Certificates  attached  hereto)  with the  Secretary  of State of the
States of California and Delaware (the "Effective  Time"),  Newco will be merged
with and into Company,  and Company shall continue as the surviving  corporation
(following the Merger,  the Company is hereinafter  sometimes referred to as the
"Surviving Corporation"), pursuant to the terms and conditions of this Agreement
and in  accordance  with  applicable  provisions  of the laws of the  States  of
Delaware and California as follows:

         1.1 ARTICLES OF INCORPORATION. The Articles of Incorporation of Company
immediately prior to the Effective Time, without amendment thereto, shall be the
Articles of Incorporation of the Surviving Corporation.

         1.2 BYLAWS.  The Bylaws of Company  immediately  prior to the Effective
Time,  without  amendment  thereto,   shall  be  the  Bylaws  of  the  Surviving
Corporation.  The Bylaws of the Surviving Corporation  thereafter may be amended
in accordance with their terms,  the Articles of  Incorporation of the Surviving
Corporation and as provided by the California Law.

         1.3  CONVERSION OF SHARES.  As of the Effective  Time, by virtue of the
Merger and without any action on the part of any shareholder of Company, each of
the  issued and  outstanding  shares of  Company's  Common  Stock (the  "Company
Shares") (other than any shares held by persons exercising dissenters' rights in
accordance with Chapter 13 of the California Law ("Dissenting Shares")) shall be
converted into the right to receive,  subject to the provisions of Section 1.1.1
of the Plan,  0.148612  (the  "Applicable  Fraction")  shares of fully  paid and
nonassessable Buyer's Common Stock (the "Conversion Shares").

                                      -10-
<PAGE>
         1.4  ASSUMPTION  OF  OPTIONS.  At the  Effective  Time,  each option to
purchase  shares  of  Company  Common  Stock  (the  "Company  Options")  that is
outstanding  immediately  prior to the  Effective  Time  will,  by virtue of the
Merger and without further action on the part of any holder thereof,  be assumed
by Buyer and become exercisable for the number of shares of Buyer's Common Stock
that equals the number of shares of Company Common Stock subject to such Company
Option  multiplied by the Applicable  Fraction.  The exercise price per share of
Buyer  Common  Stock  purchasable  under each such  option  will be equal to the
exercise price of the Company Option  divided by the  Applicable  Fraction.  All
other terms of the Company Option will remain unchanged.

         1.5 FRACTIONAL SHARES. No fraction of a Conversion Share will be issued
by virtue of the Merger,  but in lieu thereof each holder of Company  Shares who
would  otherwise  be  entitled  to a  fraction  of  a  Conversion  Share  (after
aggregating  all  fractional  Conversion  Shares to be received by such  holder)
shall  receive from Buyer an amount of cash  (rounded to the nearest whole cent)
equal  to the  product  of (i) the  price  of a share of  Buyer's  Common  Stock
determined  pursuant  to  Section  1.1.1  of the  Plan,  multiplied  by (ii) the
fraction of a  Conversion  Share to which each such holder  would  otherwise  be
entitled.

         1.6      NO FURTHER TRANSFER. At the Effective Time, the stock transfer
books of the Company  shall be closed and no transfer  of Company  Shares  shall
thereafter be made.

         1.7 ESCROW.  Of the aggregate  number of Conversion  Shares issuable by
virtue of the Merger to a shareholder, Buyer shall deposit in escrow a number of
Conversion  Shares equal to ten percent  (10%) of the total number of Conversion
Shares  issuable  by virtue of the  Merger to such  shareholder  (the  "Escrowed
Shares"), pursuant to the terms of a separate Escrow Agreement. In addition, ten
percent  (10%) of the shares of Buyer's  Common  Stock  issued upon  exercise of
assumed Company Options will be deposited into escrow.

         1.8      DISSENTERS'  RIGHTS.  Holders  of  Dissenting  Shares who have
complied  with  all   requirements  for  perfecting  the  rights  of  dissenting
shareholders  as set forth in Section 1300 et. seq. of the  California Law shall
be entitled to their rights under the California Law.

         1.9  CANCELLATION  OF SHARES OF NEWCO. At the Effetive Time, all of the
previously issued and outstanding  shares of Newco Common Stock that were issued
and outstanding  immediately  prior to the Effective Time shall be automatically
retired and cancelled.

2.       SURRENDER OF CERTIFICATES

         2.1  SURRENDER  AND EXCHANGE OF  OUTSTANDING  CERTIFICATES.  As soon as
practicable   after  the  Effective  Time,  each  holder  of  a  certificate  or
certificates  representing  Company  Shares issued and  outstanding  immediately
prior to the Effective Time (other than Dissenting  Shares) shall surrender such
certificate(s) to Buyer's transfer agent.  Thereupon,  each such holder shall be
entitled to receive in exchange  therefor the number of shares of Buyer's Common
Stock  represented by such  certificate(s),  less the Escrowed  Shares.  Buyer's
transfer agent shall issue to the Company's  shareholders  certificates  for the
shares of Buyer's  Common Stock  issuable to the Company's  shareholders  in the
Merger as soon as practicable  following such surrender.  Each certificate which
immediately  before the Effective Time evidenced  Company Shares shall, from and
after the Effective Time until such  certificate is surrendered to Buyer, or its
transfer agent, be deemed, for all corporate purposes,  to evidence the right to
receive the consideration  described above;  provided,  however, that until such
certificate  is so  surrendered  by the holder  thereof,  no  dividend  or other
distribution  payable to such holder after the  Effective  Time shall be paid in
respect of such certificates.

3.       TERMINATION AND AMENDMENT

         3.1 TERMINATION.  Notwithstanding the approval of this Agreement by the
shareholders of Newco and Company,  this Agreement may be terminated at any time
prior to the  Effective  Time by the  mutual  written  agreement  of  Newco  and
Company,  and will  terminate in the event the Plan is  terminated in accordance
with its terms.  In the event of the  termination  of this Agreement as provided
above,  this Agreement will forthwith become void and there will be no liability
on the part of either Buyer, Newco and Company or their respective  officers and
directors, except as otherwise provided in the Plan.

                                      -11-
<PAGE>

         3.2      AMENDMENT.  This  Agreement  may  be  amended  by the  parties
hereto at any time by execution of an instrument in writing  signed on behalf of
each of the parties hereto.

4.       MISCELLANEOUS

         4.1      COUNTERPARTS.  This  Agreement  may be executed in one or more
counterparts, all of which shall be considered one and the same agreement.

         4.2      PLAN. The Plan and this Agreement are intended to be construed
together in order to effectuate their purposes.

         4.3  ASSIGNMENT;  BINDING UPON  SUCCESSORS  AND ASSIGNS.  Neither party
hereto may assign any of its rights or obligations  under this Agreement without
the prior written  consent of the other party  hereto.  This  Agreement  will be
binding upon and inure to the benefit of the parties hereto and their respective
successors and permitted assigns.

         4.4      GOVERNING  LAW.  This   Agreement   shall  be  governed by and
construed  in  accordance  with the  internal  laws of the  State of  California
(irrespective of its choice of law principles).

         4.5 FURTHER  ASSIGNMENTS.  After the  Effective  Time,  Company and its
officers  and  directors  may execute and deliver  such deeds,  assignments  and
assurances  and do all other things  necessary or desirable to vest,  perfect or
confirm  title to Newco's  property or rights in Company and  otherwise to carry
out the purposes of the Plan, in the name of Newco or otherwise.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the date and year first above written.


                                             DR. DESIGN, INC.


By:      /s/ Laura Thompson                  By:    /s/ Marco Thompson
         -------------------------                  -------------------------
         Laura Thompson, Secretary                  Marco Thompson, President



                                             ISI PURCHASING CORPORATION


By:      /s/ Narendra Gupta                  By:    /s/ David St. Charles
         -------------------------                  ----------------------------
         Narendra Gupta, Secretary                  David St. Charles, President





                      SIGNATURE PAGE TO AGREEMENT OF MERGER

                                      -12-
<PAGE>
                             CERTIFICATE OF APPROVAL
                                       OF
                               AGREEMENT OF MERGER



Sharon Pinto and Laura Thompson hereby certify that:

                  1.    They are the Vice President and Secretary, respectively,
of DR. DESIGN, INC., a California corporation (the "Company").

                  2.    The  Agreement  of  Merger in the form attached was duly
approved by the Board of Directors of the Company.

                  3.    The   Company  has  three  (3)  authorized  classes   of
shares,  designated as Class A Common Stock,  Class B Common Stock and Preferred
Stock.  There are no issued and  outstanding  shares of Class B Common  Stock or
Preferred Stock of the Company entitled to vote on the Agreement of Merger.  The
total number of issued and outstanding shares of the Class A Common Stock of the
Corporation entitled to vote on the Agreement of Merger was 2,555,720.

                  4.    The  percentage  vote required for Common Stock was more
than 50% of the outstanding shares of the Common Stock.

                  5.    The  Agreement  of Merger was  approved by the vote of a
number of shares of Common  Stock of the Company  which  equaled or exceeded the
vote required.

                  We further  declare under penalty of perjury under the laws of
the State of California that the matters set forth in this  Certificate are true
and correct of our own knowledge.

                  Executed at San Diego,  California,  this 25th day of January,
1996.




/s/ Sharon Pinto                                       /s/ Laura Thompson
- ----------------------------                           -------------------------
Sharon Pinto, Vice President                           Laura Thompson, Secretary

                                      -13-
<PAGE>

                             CERTIFICATE OF APPROVAL
                                       OF
                               AGREEMENT OF MERGER



         David St. Charles and Narendra Gupta hereby certify that:

                  1.       They  are the President and Secretary,  respectively,
of ISI Purchasing Corporation, a Delaware corporation ("Newco").

                  2.       The  Agreement  of Merger in the  form  attached  was
duly approved by the Board of Directors of Newco.

                  3.       Newco has one class of shares  authorized, designated
as Common Stock. The total number of issued and outstanding shares of the Common
Stock of the Corporation entitled to vote on the Agreement of Merger was 1,000.

                  4.       The  percentage  vote required for  Common  Stock was
more than 50% of the outstanding shares of the Common Stock.

                  5.       The Agreement of Merger was approved by the vote of a
number of shares of Common  Stock of Newco which  equaled or  exceeded  the vote
required.

                  6.       No vote of  the  shareholders of Integrated  Systems,
Inc.,  the  parent  corporation  of  Newco  and  the  corporation  whose  equity
securities are being issued in the merger, is required.

                  We further  declare under penalty of perjury under the laws of
the State of California that the matters set forth in this  Certificate are true
and correct of our own knowledge.

                  Executed at Santa Clara, California, this 25th day of January,
1996.




/s/ David St. Charles                                 /s/ Narendra Gupta
- ----------------------------                          --------------------------
David St. Charles, President                          Narendra Gupta, Secretary


                                      -14-


                                                                    EXHIBIT 4.03



                                  DR. DESIGN, INC.
                             1991 STOCK OPTION PLAN


         1.  DESCRIPTION  OF PLAN.  This is the 1991 Stock  Option  Plan,  dated
August 10, 1991 (the "Plan"), of Dr. Design, Inc., a California corporation (the
"Company").  Under this Plan, certain key employees,  non-employee directors and
consultants  with  important  business  relationships  with the Company,  or any
present or future subsidiary of the Company,  may be granted Options ("Options")
to  purchase  shares of the common  stock of the  Company  ("Common  Stock") . A
person who is granted an Option is referred to as an "Optionee". For purposes of
this Plan,  the term  "subsidiary"  shall have the same  meaning as  "subsidiary
corporation"  as such term is defined in Section 425(f) of the Internal  Revenue
Code of 1986,  as amended  (the  "Code"),  where the  Company  is the  "employer
corporation".  It is  intended  that the  Options  under  this Plan will  either
qualify for treatment as incentive  stock Options under Section 422A of the Code
and be designated  "Qualified  Stock  Options" or not qualify for such treatment
and be designated "Non-Qualified Stock Options."

         2.  PURPOSE OF PLAN.  The purpose of the Plan is to provide  additional
incentives  to certain key  employees and other persons that will enable them to
purchase Common Stock of the Company and thereby share and directly benefit from
the Company's growth,  development and financial success.  In this way, the Plan
will allow the Company to attract and retain key employees and other persons and
encourage them to remain in the Company's service.

         3.  ADMINISTRATION.  The Plan shall be administered by a committee (the
"Committee") to be composed of not less than 2 members of the Board of Directors
of the Company ("Board"),  who are not eligible for selection as Optionees under
the Plan.  Members of the Committee  shall be appointed,  both  initially and as
vacancies occur, by the Board, to serve at the pleasure of the Board. The entire
Board may serve as the Committee, if by the terms of this Plan all Board members
are otherwise  eligible to serve on the Committee.  The Committee  shall meet at
such  times and  places as it  determines,  but at least  once a year  after the
Company's  fiscal year end. A majority of its members shall constitute a quorum,
and the decision of a majority of those present at any meeting at which a quorum
is present shall constitute the decision of the Committee.  A memorandum  signed
by all of its members shall constitute the decision of the Committee without the
necessity of holding an actual meeting.

         The Committee is authorized  and empowered to administer  the Plan and,
subject to the Plan (i) to select the Optionees, to specify the number of shares
of Common Stock with respect to which Options are granted to each  Optionee,  to
specify the Option  Price (as defined in Section 8) and the terms of the Options
and in general to grant  Options;  (ii) to specify  whether the Options  granted
will be for Class A - Voting or Class B - Non-voting  Stock;  (iii) to determine
the dates  upon which  Options  shall be  granted  and the terms and  conditions
thereof in a manner  consistent with this Plan,  which terms and conditions need
not be  identical as to the various  Options  granted;  (iv) to determine  which
Options are to be Qualified Stock Options and Non-Qualified  Stock Options;  (v)
to interpret the Plan;  (vi) to prescribe,  amend and rescind rules  relating to
the Plan;  (vii) to determine the rights and  obligations of Optionees under the
Plan; and (viii) to accelerate the Vesting Schedule and/or the time during which
an  Option  may be  exercised,  notwithstanding  the  provisions  in the  Option
Agreement  (as  defined in Section 7) stating  the time  during  which it may be
exercised.

                                      -1-
<PAGE>
         The above matters are not exclusive, and the Committee and/or the Board
shall  have the  authority  to  determine  any  other  matters  incident  to the
administration of this Plan. The Board, and not the Committee, is authorized and
empowered to determine  whether any shares of Common Stock subject to repurchase
by the  Company or its  nominees  as  provided  in  Section 16 will be  actually
repurchased by the Company. The interpretation and construction by the Committee
of any  provision of the Plan or of any Option  granted under it shall be final.
No  member of the  Committee  or the Board  shall be  liable  for any  action or
determination made in good faith with respect to this Plan or any Option granted
under this Plan.

         4. SHARES  SUBJECT TO THE PLAN.  The  aggregate  amount of Common Stock
which may be purchased  pursuant to Options granted under this Plan shall be One
Million  (1,000,000)  shares  of  the  Company's   authorized  but  unissued  or
reacquired  Common  Stock,  subject to  adjustment  as provided in Section 18 to
reflect all stock splits,  stock  dividends or similar capital  changes.  If any
Option shall expire or terminate for any reason without having been exercised in
full,  and/or if the Company  repurchases any shares of Common Stock as provided
herein,  such  unexercised  shares and reacquired  shares shall be available for
granting additional Options under the Plan.

         5. ELIGIBILITY.  The persons who shall be eligible to receive grants of
Qualified  Stock  Options  under  this Plan  shall be the key  employees  of the
Company or any of its  subsidiaries,  and those directors of the Company who are
also key employees,  but who are not members of the  Committee.  The persons who
shall be eligible to receive  grants of  Non-Qualified  Stock Options under this
Plan shall be the key employees of the Company or any of its  subsidiaries,  any
director of the Company,  whether or not he or she is an employee of the Company
(provided that he or she is not a member of the  Committee),  and consultants or
advisers with important  business  relationships with the Company (provided that
substantial  bona fide services  shall have been rendered to the Company by such
advisers or consultants and such services shall not have been in connection with
the offer and sale of securities in a capital raising transaction).

         The Committee  shall have the right in its sole discretion to determine
who is a "key  employee" of the  Company.  The  selection  of Optionees  and the
criteria used to select  Optionees  shall also be within the sole  discretion of
the  Committee.  An Optionee who is granted in writing a leave of absence by the
Board shall be deemed to have remained in the employ of the Company  during such
leave of absence for purposes of this Plan.

         Notwithstanding  the  foregoing,  members  of the  Committee  shall  be
ineligible for selection as participants in the Plan during their service on the
Committee.  More than one Option may be  granted to any one  Optionee.  However,
pursuant to Section  422A(d) of the Code, for Qualified  Stock Options,  no more
than $100,000 of market value Common Stock  (determined  at time of granting the
Option) plus a carryover amount, if applicable, can be granted to an Optionee in
any one calendar  year.  Any portion of an Option that exceeds such amount shall
be treated and deemed a Non-Qualified Stock Option.

         6 . TIME OF GRANTING OPTIONS. The date of grant of an Option shall, for
all  purposes,  be the date when the  Committee  determines  to grant an Option.
Notice of the determination shall be given to each Optionee to whom an Option is
granted within a reasonable time after the date of such grant.

         7.  OPTION  AGREEMENT.  Each  Option  granted  under this Plan shall be
evidenced by a written stock Option agreement ("Option  Agreement")  executed by
the Company and the Optionee.  Each Option Agreement shall,  among other things,
(a) specify the number of shares of Common Stock  granted to an Optionee and the
purchase price per share, (b) designate  whether the Options will be for Class A
- - Voting or

                                      -2-
<PAGE>
Class B -  Non-voting  Common  Stock,  (c) contain  each of the  provisions  and
agreements  of this Plan  specifically  required to be  contained  therein,  (d)
indicate   whether  such  Option  is  to  be  a  Qualified  Stock  Option  or  a
Non-Qualified  Stock Option, and if a Qualified Stock Option shall contain terms
and conditions  permitting  such Option to qualify for treatment as an incentive
stock Option under  Section 422A of the Code,  (e) contain the  agreement of the
Optionee  to resell to the  Company  any Common  Stock  issued  pursuant  to the
exercise of Options granted under this Plan pursuant to the Company's repurchase
rights  and/or  rights of first refusal as provided in Sections 16 and 17 below,
(f) specify the Vesting Schedule and Vesting Start Date (as described in Section
9 below), and (g) contain such other terms and conditions as the Committee deems
desirable  and which are not  inconsistent  with this Plan.  The  granting of an
Option or the execution of an Option Agreement shall not require the Optionee to
exercise such Option.

         8.  OPTION  PRICE.  Except as provided in Section 18 or Section 19, the
purchase price per share (the "Option  Price") of Common Stock  underlying  each
Option shall be determined by the  Committee,  but shall not be less than 85% of
the fair market  value of such  shares on the date the Option is  granted.  With
respect to any Qualified  Stock Option,  the Option Price shall not be less than
100% of the fair  market  value of such shares on the date the  Qualified  Stock
Option is granted;  provided,  however,  that if the  Optionee  is a  10-percent
shareholder  of the Company  (as defined in Section  422A(b) (6) of the Code) at
the time such Qualified  Stock Option is granted,  the Option Price shall not be
less  than  110% of the fair  market  value.  The  fair  market  value  shall be
determined in good faith by the Committee or the Board in its sole discretion.

         9. VESTING  REQUIREMENTS.  There shall be a vesting schedule  ("Vesting
Schedule")  for all  Options  granted  under  this  Plan.  The  Committee  shall
determine, in its sole discretion, the Vesting Schedule that shall apply to each
Option  granted  under  this  Plan.  The  Vesting  Schedule  shall be based on a
specified time period,  certain  performance or milestone  goals,  or such other
criteria or factors selected by the Committee in its sole discretion.

         The Vesting  Schedules may differ among the Options  granted under this
Plan;  in  other  words,  the  Committee  shall  have  the  right,  in its  sole
discretion,  to designate  different Vesting Schedules for different  Optionees,
and  different  Vesting  Schedules  for  various  Options  granted  to the  same
Optionee. In addition,  the Committee has the right, in its sole discretion,  to
specify  Vesting  Schedules  for  certain   Optionees   consistent  with  or  to
accommodate vesting commitments that have been previously made and authorized by
the Board  subject to the  adOption of this Plan,  as embodied in the  corporate
minutes and records of the Company.

         The Vesting  Schedule  applied to each Option shall be set forth in the
Option  Agreement.  Each Option  Agreement  shall  specify a Vesting Start Date,
which shall be determined by the Committee in its sole  discretion.  The Vesting
Start  Date is the  beginning  date from  which the  Vesting  Schedule  shall be
calculated.

         The  Vesting  Schedule is  basically  a time  period or other  criteria
during which Options and shares of Common Stock issued to Optionees  shall vest.
An Optionee  shall have the right to exercise all or any portion of an Option at
any time after it is granted.  However, the Vesting Schedule shall determine the
manner in which the  unexercised  portion of an Option  and/or  shares of Common
Stock issued to an Optionee upon exercise of an Option shall vest.

                                      -3-
<PAGE>
         The basic purpose of the Vesting Schedule is to determine the rights of
an Optionee and the Company as to Options  and/or  issued shares of Common Stock
upon  an  Optionee's   termination   or  cessation  of  work  for  the  Company.
Specifically,  upon an  Optionee's  termination  or  cessation  of work  for the
Company  as  described  in Section  12 below and in the  Option  Agreement,  the
Vesting  Schedule shall apply as follows:  any unexercised and unvested  Options
shall lapse and be forfeited by the Optionee  upon the  termination  date. As to
any vested  Options,  an Optionee shall have the right to exercise the remaining
unexercised  portion of a vested  Option  during the  applicable  Window  Period
(defined in Section 12 below). With respect to any issued and vested shares held
by an Optionee at the  termination  date, that Optionee cannot sell or otherwise
transfer the vested shares  without first giving the Company the  opportunity to
exercise its Right of First  Refusal under Section 17 of this Plan. In addition,
as to any issued but  unvested  shares held by an  Optionee  at the  termination
date,  the Company shall have the right to repurchase  the unvested  shares from
the Optionee pursuant to Section 16 below.

         For  example,  assume  that an Option  for 1,000  shares is  granted on
October 1, 1991.  The Committee  determines  that the Vesting  Schedule for this
Option  shall be as  follows:  the Option or shares  will fully vest in four (4)
years from the Vesting  Start Date.  The Vesting  Start Date is January 1, 1990,
the date the  Optionee  was  hired by the  Company.  According  to this  Vesting
Schedule,  no portion of an Option or shares  issued  under an Option shall vest
before the one (1) year anniversary of the Vesting Start Date ("Holding Period).
Upon the one (1) year  anniversary  of the Vesting Start Date (or  expiration of
the Holding Period),  twenty-five percent (25%) of the Option or shares shall be
deemed  vested.  Thereafter,  the  Option or shares  shall  vest at  twenty-five
percent (25%) for every  subsequent  year. In addition,  after the first year, a
pro rata portion of the annual twenty-five percent (25%) vesting shall be deemed
to vest each month.

         Under the above  example,  on October 1, 1991,  the date the Option was
granted,  the  Optionee  may  exercise all or any portion of the Option since an
Optionee has the right to purchase  any shares  under an Option at any time.  An
Optionee's  ability to  exercise  an Option is not  conditioned  on whether  the
Option is vested or nonvested.  Assume that Optionee purchases two hundred fifty
(250)  shares  under the Option in 1991,  and is  terminated  by the  Company on
December 31, 1992. On December 31, 1992,  only fifty percent (50%) of the Option
or shares shall be deemed vested,  since twenty-five  percent (25%) vested as of
January 1, 1991 (the expiration of the Holding Period),  and twenty-five percent
(25%) vested for the year 1991.

         As a result, upon such termination,  the two hundred fifty (250) shares
previously  purchased and issued to Optionee are vested  shares,  subject to the
Company's  Right of First Refusal in the event Optionee  proposes to transfer or
sell such shares.  Since fifty percent (50%) or five hundred (500) shares of the
Option are deemed vested as of the termination date, and two hundred fifty (250)
shares have already  been  issued,  Optionee has the right during the sixty (60)
day Window  Period  specified  in  Section  12(b) of this Plan to  purchase  the
remaining two hundred fifty (250) vested  shares.  If Optionee does not purchase
the vested portion of the Option (250 shares) within the Window Period, then the
Option shall automatically terminate upon the expiration of the Window Period.

         Using the same example above,  assume that Optionee had purchased seven
hundred fifty (750) shares under the Option before he/she was terminated.  Since
only fifty  percent  (50%) or five hundred (500) shares will be deemed vested as
of the termination date, five hundred (500) of the issued shares shall be vested
and two hundred  fifty (250) of the issued shares shall be  non-vested.  In such
event,  the Company  has the right to  repurchase  the two  hundred  fifty (250)
unvested shares at the Option Price pursuant to Section 16 of this Plan, and the
other five  hundred  (500)  vested  shares may be  transferred  by the  Optionee
subject to the  Company's  Right of First Refusal under Section 17 of this Plan.
Since  there is no  remaining  unexercised  portion of the Option that is deemed
vested as of the  termination  date,  Optionee may not  purchase any  additional
shares during a Window Period or after termination.

                                      -4-
<PAGE>
         The above examples are only for informational purposes. The application
of each Option will depend upon the specific  provisions of the Vesting Schedule
for each Option.

         10. EXERCISE OF OPTIONS.  Subject to all other provisions of this Plan,
each Option shall be  exercisable  for the full number of shares of Common Stock
specified in the grant and in the Option Agreement,  or any part thereof, at any
time after the Option is granted.  However,  an Optionee  shall not exercise any
Option,  or part thereof,  more frequently than once per calendar  quarter;  the
preceding limitation shall not apply if the Common Stock becomes publicly traded
upon an initial  public  offering of its  securities  pursuant to a registration
statement filed by the Company under the Securities Act of 1933, as amended.

         No Option can be exercised  after its  termination  date or after it is
terminated  pursuant to Section 12. Each Option shall terminate and expire,  and
shall no longer be  subject to  exercise,  as the  Committee  may  determine  in
granting such Option,  but in no event later than ten (10)  calendar  years from
the date the Option is granted.  An Option can be exercised only by the Optionee
to whom it is granted during his/her  lifetime.  After the death of an Optionee,
the vested portion of the Option may be exercised,  prior to its  termination as
provided in Section 12 below, only by his/her legal  representative,  legatee or
heir who acquired the right to exercise the Option.

         11. METHOD OF EXERCISING  OPTIONS.  An Option shall be exercised by the
Optionee by delivering to the Company  before the Option expires or terminates a
written notice  specifying the number of shares to be purchased.  The Optionee's
written  notice must be  accompanied by (a) payment of the full Option Price for
the number of shares to be  purchased  in cash,  by check or such  other  lawful
consideration  (including promissory notes or the assignment and transfer by the
Optionee to the Company of outstanding shares of Common Stock previously held by
the Optionee in a manner  intended to comply with the  provisions  of Rule 16b-3
under the  Securities  and Exchange Act of 1934) as the Committee may approve in
its sole  discretion,  (b) upon  the  Company's  request,  a letter  or  written
statement  from the  Optionee in form and  substance  acceptable  to the Company
setting forth the investment intent and other  representations  of the Optionee,
and (c) upon the Company's  request,  payment in cash or check of any taxes that
the Company is required to withhold or collect as further  discussed  in Section
21.

         12.   TERMINATION  OF  OPTIONS.   Any  portion  of  an Option  that has
vested pursuant to the terms of an Option Agreement shall immediately  terminate
upon the first to occur of any of the following events:

               (a)   the expiration or termination date  specified in the Option
Agreement;

               (b)   the expiration of  sixty  (60)  days  from  the  date of an
Optionee's  termination or  resignation  of employment or voluntary  leaving the
employ  of the  Company  ("Window  Period")  (other  than by  reason of death or
disability),  except if the Optionee is  terminated  for "Cause',  as defined in
Section 16 of this Plan, then the Option terminates upon the termination date;

               (c)  the  expiration  of six  (6)  months  from  the  date  of an
Optionee's termination or other cessation of employment ("Window Period") due to
that Optionee having become  disabled within the meaning of Section  22(e)(3) of
the Code;

               (d)  the expiration  of twelve  (12)  months  from the date of an
Optionee's death ("Window  Period") if his/her death occurs while being employed
with the Company;

               (e)  for  Options  granted to consultants or other  non-employees
who become  members of the Board,  if the  Optionee is no longer a member of the
Board;

                                      -5-
<PAGE>
               (f) for  Options  granted to  consultants  or third  parties  who
perform  substantial bona fide services to the Company,  if the Optionee has not
provided  services to the Company as an  independent  contractor,  consultant or
advisor for a period of time  determined  by the Committee or the Board in their
sole discretion, at the time of granting the Option; and/or

               (g)      the termination of an Option pursuant to Section 18.

         In addition to the above  events,  all  Qualified  Stock  Options shall
terminate  no later than ten (10) years from the date the Option is granted,  or
no later than five (5) years from the date the  Option is  granted  for  Options
granted to Optionees who own more than ten percent  (10%) of the total  combined
voting  power of all  classes of the  Company's  stock at the time the Option is
granted (as defined in Section 422A(b)(6) of the Code).

         Upon  the  termination  of an  Optionee  for any  reason  or  upon  the
happening  of any of the events in  subparagraphs  (e),  (f) or (g)  above,  all
unexercised  and unvested  portions of an Option shall  automatically  lapse and
shall not be entitled to be exercised at any further time. All  unexercised  and
vested Options, or parts thereof,  that are not exercised during a Window Period
or prior to  termination as provided above shall be forfeited by an Optionee and
shall not be exercised after the Window Period or termination  date, as the case
may be. Upon such  termination,  all issued but unvested  shares of Common Stock
owned by an Optionee shall be subject to being repurchased by the Company at the
Option  Price  pursuant  to  Section  16 of this Plan.  In  addition,  upon such
termination,  all issued and vested  shares of Common Stock owned by an Optionee
shall only be  subject  to the  Company's  Right of First  Refusal  set forth in
Section 17 of this Plan.

         13. ADDITIONAL REQUIREMENTS FOR QUALIFIED STOCK OPTIONS. Subject to the
other  provisions of this Plan,  all Optionees who are granted  Qualified  Stock
Options must satisfy all the following  requirements in order to receive the tax
benefits of an incentive stock Option under the Code:

               (a) the  Optionee  must be  continuously  employed by the Company
from the time the Option is granted until at least three (3) months before it is
exercised  (twelve (12) months if the Optionee is disabled within the meaning of
Section 22(e)(3) of the Code);

               (b) the  Optionee  must hold the Common  Stock until at least two
(2) years  after the Option is granted  and one (1) year after it is  exercised;
and

               (c) the Optionee cannot exercise a current Qualified Stock Option
while there is outstanding  another  Qualified  Stock Option that was previously
granted to the Optionee that has not been fully exercised.

         A Qualified Stock Option issued to an Optionee who fails to meet all of
the three (3)  requirements  above is  subject to being  treated  and taxed as a
Non-Qualified Stock Option.

         14. ISSUANCE OF COMMON STOCK.  Notwithstanding anything to the contrary
contained  herein,  the Company shall not be obligated to grant any Option under
this Plan or to sell or issue any Common Stock  pursuant to any Option or Option
Agreement,  unless the grant or sale is effectively registered or qualified,  or
exempt from  registration  or  qualification  under all applicable  state and/or
federal laws or rulings and  regulations of any  governmental  regulatory  body.
Prior to the  execution  of an Option  Agreement  and/or  issuance of the Common
Stock, the Company shall have the right to require an Optionee to deliver to the
Company written investment  representations or other warranties deemed necessary
or advisable  by the Company to comply with the  requirements  of any  exemption
from such registration or other qualification of such shares.

                                      -6-
<PAGE>
         The  required   representations  and  warranties  may  include  without
limitation  representations  and agreements that each Optionee (a) is purchasing
such shares for investment and for his/her own account, and not with any present
intention  of  selling  or  otherwise  disposing  of  such  shares;  (b)  has  a
pre-existing  personal or business relationship with the Company or its officers
or directors, or has sufficient business or financial experience to evaluate the
risks  involved  in  purchasing  the Common  Stock;  (c) agrees to have a legend
placed upon the face or reverse of any certificates  evidencing such shares that
restrict the transfer of such shares; and/or (d) agrees to such other matters as
the Company requires or deems advisable.

         15.  NONTRANSFERABILITY.   Unless  otherwise  provided  in  the  Option
Agreement,  an Optionee shall not sell, assign,  encumber,  transfer or permit a
levy or  attachment  on all or any part of his/her  Qualified  Stock  Options or
Non-Qualified  Stock  Options  and/or  any  shares  of  Common  Stock  purchased
thereunder  to any person or entity at any time.  The Option  Agreement  may, in
some instances,  provide that certain Options granted hereunder and/or shares of
Common Stock previously issued to Optionee may be transferable by will or by the
laws of  descent  and  distribution  upon the death of an  Optionee/shareholder,
and/or any Non-Qualified Stock Options may be transferable or assignable subject
to the  Company's  Right of First  Refusal to purchase the Common Stock prior to
such transfer or assignment as provided in Section 17 below.

         The Option  Agreement may also provide that an Optionee or  shareholder
holding  Non-Qualified  Stock Options or shares of Common Stock  purchased under
Non-Qualified Stock Options may have the right, with prior written notice to the
Company, to transfer or assign such Options or shares of Common Stock to his/her
spouse, children or a living trust for the benefit of their family, provided the
Optionee/shareholder  or his or her spouse is the sole  trustee of the trust and
the sole  beneficiaries of the trust shall be the  Optionee/shareholder,  his or
her spouse and/or their children,  and further provided that any such transferee
shall  agree in writing to be bound by all the  provisions  of this Plan and the
Option  Agreement  as a condition  precedent  to the transfer and receipt of the
shares of Common Stock. In addition,  in the event the Company's Common Stock is
publicly traded,  there will be additional  restrictions  imposed on the sale or
transfer of Common  Stock  pursuant to Rule 144 of the  Securities  and Exchange
Commission and other applicable laws, rules or regulations.

         16.  REPURCHASE  OF STOCK.  Upon the  termination  of an Optionee as an
employee,  independent  contractor  or consultant of the Company for "Cause" (as
defined  below),  the Company and its assignees  shall have the right,  in their
sole discretion,  to repurchase  ("Repurchase  Right") some or all of any vested
and/or  unvested  shares of Common Stock  previously  issued to an Optionee upon
exercise  of any Option  ("Repurchase  Shares").  Pursuant to Section 12 of this
Plan,  all  unexercised  portions  of an  Option,  vested or  non-vested,  shall
automatically  lapse upon  termination  of an Optionee for "Cause".  The Company
shall  exercise its  Repurchase  Right within sixty (60) days after the date the
Optionee is  terminated  for "Cause" by paying to the Optionee in cash an amount
per share equal to the Option Price.

         In  addition to the above the  Repurchase  Right upon  termination  for
"Cause", the Company shall also have a repurchase right as to all or any portion
of issued shares that are unvested as of the  termination  date. In other words,
if an Optionee is  terminated  or ceases to work for the Company for any reason,
and has previously  purchased  shares of Common Stock that have not vested as of
the  termination  date,  then the  Company  shall  have the right to  repurchase
("Repurchase  Right")  some or all of the issued and  unvested  shares of Common
Stock  ("Unvested  Shares") at the Option Price.  The Company shall exercise its
Repurchase  Right for the  Unvested  Shares  within  sixty  (60) days  after the
termination  date by paying to the Optionee in cash an amount per share equal to
the Option Price.

                                      -7-
<PAGE>

         Upon termination for "Cause", or other termination whereby Optionee has
Unvested  Shares,  the Optionee  shall  surrender and deliver to the Company the
stock  certificates for the Repurchase Shares and the Unvested Shares.  Any new,
substituted or additional  securities or other property distributed with respect
to the  Repurchase  Shares or  Unvested  Shares as a result of any stock  split,
recapitalization  or adjustment under Section 18 below shall also be held by the
Company until it decides whether to exercise its Repurchase  Right.  Any regular
cash  dividends  on the  Repurchase  Shares  or  Unvested  Shares  shall be paid
directly to the Optionee and shall not be held by the  Company.  The  Repurchase
Shares  or  Unvested  Shares  and any  other  assets  or  securities  associated
therewith  shall be  released to and  retained by the Company and its  assignees
upon exercise of the Repurchase Right, or shall be released to the Optionee upon
expiration  of the sixty (60) day period if the  Company has not  exercised  its
Repurchase Right as to all of the Repurchase Shares or Unvested Shares.

         The Company shall  exercise its  Repurchase  Right by delivering to the
Optionee a written notice and paying the Option Price for the Repurchase  Shares
or Unvested  Shares  within the sixty (60) day period.  In the event the Company
does not exercise its  Repurchase  Right as provided  herein,  or exercises  its
Repurchase  Right as to some but not all of the  Repurchase  Shares or  Unvested
Shares,  the remaining  Repurchase  Shares and/or Unvested Shares shall still be
subject to the Company's  Right of First Refusal  pursuant to Section 17 of this
Plan.

         The term "Cause" shall mean (a) willful  misconduct,  gross negligence,
theft, fraud or embezzlement; (b) alcoholism or illegal drug addiction, that the
Board or Committee has reasonably determined causes the Optionee to be unable to
perform  his/her  duties and  responsibilities  for the Company;  and/or (c) the
unauthorized use,  disclosure or  misappropriation,  or attempt thereof,  of any
confidential  information  or trade  secrets of the  Company  or any  subsidiary
thereof.

         17.  RIGHT OF FIRST  REFUSAL.  The Company  shall have a right of first
refusal  over all  Options  and all Common  Stock  issued  upon the  exercise of
Options ("Right of First  Refusal").  If an Optionee desires at any time to sell
or otherwise transfer all or any part of vested Options, vested shares of Common
Stock  previously  issued to Optionee,  and/or  Unvested Shares that the Company
does not elect to repurchase under Section 16, as the case may be, then prior to
any such sale or  transfer,  the  Optionee  shall give the  Company the right to
purchase  the vested  Options,  the  vested  shares of Common  Stock  and/or the
Unvested  Shares that have not been  repurchased  pursuant to the same terms and
conditions  specified in a bona fide written  offer from a third party or entity
that wishes to purchase the same from  Optionee.  The Company shall exercise its
Right of First Refusal pursuant to the terms contained in the Option  Agreement.
The Company's  Right of First Refusal shall  terminate upon the  consummation of
the sale of securities pursuant to a registration statement filed by the Company
under the  Securities  Act of 1933, as amended,  in  connection  with an initial
underwritten offering of its securities to the general public.

         18. RECAPITALIZATION,  REORGANIZATION, MERGER OR CONSOLIDATION. Subject
to any required  shareholder  action or approval,  if the outstanding  shares of
Common Stock of the Company are increased,  decreased or exchanged for different
securities through a reorganization,  merger,  consolidation,  recapitalization,
reclassification,  stock split,  stock  dividend or like capital  adjustment,  a
proportionate  adjustment shall be made (a) in the aggregate number of shares of
Common  Stock  which may be  purchased  pursuant  to the  exercise of Options as
provided in Section 4 hereof,  and (b) in the number,  price, and kind of shares
subject to any  outstanding  Option  granted  under  this  Plan.  Subject to any
required  shareholder  action  or  approval,  if the  Company  is the  surviving
corporation  in any  merger or  consolidation,  each  outstanding  Option  shall
survive and is exercisable pursuant to the terms of this Plan.

                                      -8-
<PAGE>
         Upon  the  dissolution  or  liquidation  of the  Company  or  upon  any
reorganization,  merger or  consolidation in which the Company does not survive,
this Plan and each outstanding  Option shall terminate  subject to the following
provisions.  In such event:  (a) each  Optionee who is not tendered an Option by
the surviving  corporation in accordance  with all of the terms of provision (b)
immediately below or who does not accept any such substituted Option which is so
tendered,  shall have the right until 30 days before the effective  date of such
dissolution,  liquidation,  reorganization, merger or consolidation in which the
Company is not the surviving corporation,  to exercise, in whole or in part, any
unexpired and vested  Option or Options  issued to him/her which the Optionee is
then  capable of  exercising  pursuant  to the  provisions  of the Option and of
Sections 10 and 11 above;  provided,  however, that should the Board so elect in
its sole and absolute  discretion  all  Optionees  may be given upon at least 30
days  notice  (x) the Option to  exercise,  in whole or in part,  any  unexpired
Option,  without  regard  to the  Vesting  Schedule  requirements  if the  Board
accelerates  the vesting  period,  or (y) the Option to surrender such Option or
Options to the Company for a price (which may be payable, in the sole discretion
of the Committee, in cash or in securities of the Company or in a combination of
both,  and at times or in  installments  determined  by the  Company in its sole
discretion),  equal to the difference  between the aggregate Option Price of the
Option or Options without regard to the installment provisions and the aggregate
fair market value (as  determined in the manner  provided in Section 8 above) of
the  shares  subject  to such  Option or  Options on the date one day before the
effective  date of such  dissolution,  liquidation,  reorganization,  merger  or
consolidation;  or (b)  upon at least 30 days  notice  in its sole and  absolute
discretion, the surviving corporation may, but shall not be so obligated, tender
to any  Optionee  an Option  or  Options  to  purchase  shares of the  surviving
corporation,  and such new  Option  or  Options  shall  contain  such  terms and
provisions  as shall be  required  to  substantially  preserve  the  rights  and
benefits of any Option then outstanding under the Plan.

         To the  extent  that  the  foregoing  adjustments  relate  to  stock or
securities of the Company,  such adjustments  shall be made by the Board,  whose
determination  in that respect  shall be final,  binding and  conclusive.  There
shall be no  pre-emptive  rights  regarding  the Common  Stock  and/or any other
privileges  granting  to  Optionees/shareholders  the  right to  maintain  their
percentage  ownership in the Company upon the issuance of  additional  shares of
Common Stock or any other change in capital structure. In other words, except as
expressly provided above in this Section 18, an Optionee shall have no rights by
reason of any  subdivision or  consolidation  of shares of stock of any class or
the  payment of any stock  dividend  or any other  increase  or  decrease in the
number  of shares of stock of any  class,  and the  number or price of shares of
Common Stock  subject to any Option shall not be affected by, and no  adjustment
shall be made by reason of, any dissolution, liquidation, reorganization, merger
or  consolidation,  or any  issuance  by the  Company  of shares of stock of any
class,  or rights to purchase or subscribe for stock of any class, or securities
convertible into shares of stock of any class.

         The grant of an Option  under this Plan shall not affect in any way the
right or power of the Company to make adjustments,  reclassifications or changes
in its  capital  or  business  structures  or to merge,  consolidate,  dissolve,
liquidate, sell or transfer all or any part of its business or assets.

         19.  SUBSTITUTE  OPTIONS.  If the Company at any time should succeed to
the  business  of  another  corporation  through a merger or  consolidation,  or
through the acquisition or stock or assets of such  corporation,  Options may be
granted  under  this  Plan  to  Option  holders  of  such   corporation  or  its
subsidiaries,  in substitution for Options to purchase stock of such corporation
held by them at the time of  succession.  The  Board,  in its sole and  absolute
discretion, shall determine the extent to which such substitute Options shall be
granted (if at all),  the person or persons to receive such  substitute  Options
(who need not be all Option holders of such corporation),  the number of Options
to be received by each such person,  the Option Price of such Option  (which may
be determined  without  regard to Section 8 hereof) and the terms and conditions
of such substitute Options.

                                      -9-
<PAGE>

         Provided,  however,  that the  Option  Price of each  such  substituted
Option which is a Qualified  Stock  Option shall be an amount such that,  in the
sole and absolute  judgment of the Board (and in compliance  with Section 425(a)
of the Code),  the economic  benefit provided by such Option is not greater than
the economic benefit represented by the Option in the acquired corporation as of
the  date of the  Company's  acquisition  of such  corporation.  Notwithstanding
anything to the  contrary  herein,  no Option  shall be granted,  nor any action
taken, permitted or omitted, which would cause this Plan, or any Options granted
hereunder as to which Rule 16b-3 under the  Securities  Exchange Act of 1934, as
amended, may apply, not to comply with such Rule.

         20.  RIGHTS AS A  SHAREHOLDER.  An  Optionee  shall have no rights as a
shareholder of the Company with respect to any shares covered by an Option until
the  Option  Price is fully  paid for the  shares  that are  exercised  under an
Option.  Within  thirty  (30) days of receipt of the Option  Price,  the Company
shall issue and deliver to the  Optionee  the stock  certificate  for the shares
purchased. No adjustment shall be made for dividends (ordinary or extraordinary,
whether in cash,  securities or other property) or distributions or other rights
for which the record  date is prior to the date the Option  Price is received by
the Company, except as expressly provided in Section 18.

         21.  WITHHOLDING OF TAXES. The Company or any applicable  subsidiary or
parent may deduct and  withhold  from the wages,  salary,  bonus or other income
paid by the Company or such  subsidiary  or parent to the Optionee the requisite
tax upon the amount of taxable income, if any, recognized by the Optionee due to
the  exercise  of any part of an Option or the  permitted  sale of Common  Stock
issued to an Optionee  under this Plan, all as may be required from time to time
under any federal or state tax laws and  regulations.  This  withholding  of tax
shall be made from the Company's (or such  subsidiary's or parent's)  concurrent
or next  payment of wages,  salary,  bonus or other income to the Optionee or by
payment to the Company  (or such  subsidiary  or parent) by the  Optionee of the
required withholding tax, as determined by the Committee.

         22. EFFECTIVENESS AND TERMINATION OF PLAN. This Plan shall be effective
on the date set forth on Page 1 above ("Effective  Date") since that is the date
when this Plan was adopted by the Board and approved by the  shareholders of the
Company.  No Option shall be granted under this Plan on or after that date which
is ten (10) years from the Effective  Date.  This Plan shall  terminate when all
shares of Common Stock which may be issued  hereunder have been so issued or ten
(10) years from the Effective Date,  whichever is earlier.  The Board,  however,
may in its sole discretion terminate this Plan at any time. No such termination,
other  than  as  provided  for in  Section  18,  shall  in any  way  affect  any
outstanding Option.

         23.  AMENDMENT  OF PLAN.  The Board  shall have the right to amend this
Plan in its sole discretion,  subject to approval of the shareholders.  With the
consent of each Optionee  affected,  the Board may also make such changes in the
terms and conditions of granted Options as it deems  advisable.  Such amendments
and changes shall include without  limitation  acceleration of the time at which
an Option may be vested.

         The Board,  however,  may not, without the approval of the shareholders
(a) increase the maximum  number of shares  subject to Qualified  Stock Options,
except  pursuant  to Section  18, (b)  decrease  the  Option  Price  requirement
contained  in Section 8 (except as  contemplated  by Section 19), (c) change the
designation  of the class of  employees  eligible  to  receive  Qualified  Stock
Options,  (d) modify the  limits set forth in Section 5  regarding  the value of
Common  Stock for which any  Optionee may be granted  Qualified  Stock  Options,
unless the provisions of Section 422A(d) of the Code are likewise  modified,  or
(e) in any manner  materially  increase  the benefits  accruing to  participants
under this Plan,  or  otherwise  modify this Plan such that it fails to meet the
requirements  of Rule 16b-3 of the  Securities  and Exchange  Commission for the
exemption of the acquisition,  cancellation,  expiration or surrender of Options
from the operation of Section 16(b) of the Securities Exchange Act of 1934.

                                      -10-
<PAGE>
         24. NOT AN EMPLOYMENT  AGREEMENT.  Nothing contained in this Plan or in
any Option Agreement shall confer on any Optionee any guaranty,  right or vested
interest to be continued in the employ of the Company or one of its subsidiaries
or limit the ability of the  Company or any of its  subsidiaries  to  terminate,
with or without cause, in its sole discretion, the employment of any Optionee.

         25.   GOVERNING LAW. This Plan and any Option granted  pursuant to this
Plan shall be construed and enforced under the laws of the State of California.

         26.  ARBITRATION.  All  Optionees,  shareholders  and the Company shall
attempt to resolve any dispute regarding this Plan in an amicable  fashion.  Any
unresolved  disputes regarding this Plan or the administration  thereof shall be
submitted to binding  arbitration in San Diego,  California,  to be conducted in
accordance with the rules of the American Arbitration Association ("AAA").

         Any dispute shall be submitted to an  arbitration  panel  consisting of
three (3)  members,  one of whom shall be selected by the  Company,  one of whom
shall be selected by the Optionee/shareholder, and one of whom shall be selected
by the other two arbitrators.  All arbitrators must have at least five (5) years
experience  in  the  computer  electronic  industry  and/or  the  legal  aspects
pertaining  to such  industry.  The parties  shall be entitled to all rights and
privileges to conduct discovery (i.e. interrogatories,  production of documents,
depositions,  exchange  of  witnesses,  and  subpoenas),  the right to have oral
testimony  at the  arbitration  hearing,  and other  rights as  provided  in the
California  Code  of  Civil  Procedure.   After  discovery  is  concluded,   the
arbitrators  shall  hold a  hearing  in  accordance  with  the  AAA  rules.  The
arbitration  shall be governed under  California law. The decision of a majority
of the arbitrators shall control. The order or award of the arbitrators shall be
final  and  shall be  enforced  in any  court  of  competent  jurisdiction.  The
prevailing party in the arbitration  shall be entitled to recover from the other
party its attorney's fees and costs incurred.

         27.   APPLICATION  OF FUNDS.   The  proceeds  received  by the  Company
from the sale of Common Stock  pursuant to Options may be used for any corporate
purpose. The Board shall determine, in its sole discretion,  how to use or apply
such funds or proceeds.


         28.   ENTIRE  PLAN.  This  is  the  entire  Stock  Option  Plan of  the
Company and supersedes all prior or contemporaneous discussions, representations
or agreements,  whether oral or written. This Plan cannot be modified or amended
except by the Board and/or the shareholders as provided above.

         29.  VALIDITY.  If any  provision  of this  Plan is held by a court  of
competent  jurisdiction  to be invalid,  void or  unenforceable,  the  remaining
provisions  shall  remain in full force and effect,  and the invalid  provisions
shall be revised to reflect  the intent of the  Company  regarding  the  subject
matter thereof.

                                      -11-


                                                                   EXHIBIT 5.01


                                February 20, 1996



Integrated Systems, Inc.
3260 Jay Street
Santa Clara, California 95054-3309

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  on or  about  February  20,  1996 in  connection  with the
registration  under the Securities  Act of 1933, as amended,  of an aggregate of
131,862  shares of your  Common  Stock  (the  "Common  Stock") to be sold by you
pursuant to stock  options  granted  under the Doctor  Design,  Inc.  1991 Stock
Option  Plan and  assumed  by you (the  "Options").  The  Options  were  assumed
pursuant to the terms of an  Agreement  and Plan of  Reorganization  dated as of
December 14, 1995 and amended January 26, 1996 (the "Reorganization  Agreement")
by and among you, ISI Purchasing  Corporation,  a Delaware  corporation and your
wholly owned subsidiary, and Doctor Design, Inc., a California corporation,  and
the related  Agreement of Merger dated January 26, 1996, which together with the
Reorganization Agreement effectuated a merger of ISI Purchasing Corporation with
and into Doctor Design, Inc.

         As your  counsel,  we have  examined  the  proceedings  taken by you in
connection with the assumption of the Options to purchase your Common Stock.

         It is our opinion that the number of shares of Common Stock that may be
issued and sold by you pursuant to the Options as indicated  above,  when issued
and  sold in the  manner  referred  to in the  Prospectus  associated  with  the
Registration  Statement,  the Doctor Design, Inc. 1991 Stock Option Plan and the
Options, will be legally issued, fully paid and non-assessable.

         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 and any amendments thereto.

                                Very truly yours,



                                /s/ Fenwick and West
                                -----------------------------
                                Fenwick and West



                                                                   EXHIBIT 23.01



                            Included in Exhibit 5.01




                                                                   EXHIBIT 23.02



                       CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in this  registration  statement on
Form S-8 of  Integrated  Systems,  Inc.,  of our reports  dated March 27,  1995,
except  for Note 7, as to which the date is March 31,  1995 on our audits of the
financial  statements and financial  statement  schedule of Integrated  Systems,
Inc.  as of  February  28,  1995 and 1994 and for the three  years in the period
ended February 28, 1995, which reports are included in Integrated Systems, Inc.,
1995 Annual  Report on Form 10-K.  We also consent to the  reference to our firm
under the caption "Experts."




/s/ Coopers & Lybrand L.L.P.
- ----------------------------
Coopers & Lybrand L.L.P.

San Jose, California
February 20, 1996



                                                                  EXHIBIT 24.01



                    See Page 4 of S-8 Registration Statement



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