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-


                      (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-

                  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-

                            (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-

                      (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-

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-

                            (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-

                      (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-

                               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-


                               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-

         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-


         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-

                             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-


                             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-