INTEGRATED SYSTEMS INC
8-K, 1996-02-09
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K


                                 CURRENT REPORT
                         Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934


Date of Report (Date of earliest event reported):  January 26, 1996


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


                                   California
               ---------------------------------------------------
                 (State or other jurisdiction of incorporation)


             0-18268                                94-2658153
          -------------                          ------------------
          (Commission                             (IRS Employer
          File Number)                           Identification No.)


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


                                 (408) 980-1500
              -----------------------------------------------------
              (Registrant's telephone number, including area code)


                                 Not Applicable
          ------------------------------------------------------------
          (Former name or former address, if changed since last report)







<PAGE>

ITEM 2:  ACQUISITION OR DISPOSITION OF ASSETS.

                  On January 26, 1996,  Integrated  Systems,  Inc., a California
corporation  ("Registrant" or "ISI"), acquired control of Doctor Design, Inc., a
California  corporation  ("DDI"),  pursuant to the merger (the  "Merger") of ISI
Purchasing Corporation,  a Delaware corporation and a wholly owned subsidiary of
ISI ("Sub") with and into DDI. The Merger was effected  pursuant to an Agreement
of  Merger  dated  as of  January  26,  1996 by and  between  Sub and DDI and an
Agreement and Plan of  Reorganization  dated as of December 14, 1995, as amended
January 26, 1996 (the  "Plan"),  by and among ISI,  Sub and DDI.  The Merger was
accounted  for as a pooling of interests  and was  structured to be a "tax-free"
reorganization  for federal  income tax  purposes.  The  directors and executive
officers of Registrant were not changed as a result of the Merger.  Prior to the
Merger,  DDI was a provider of high-end  design  services  to the  computer  and
communications  industries,  specializing  in the area of  embedded  multimedia.
After completion of the Merger,  DDI will continue its historical  business as a
wholly owned subsidiary of ISI.

                  Pursuant  to the terms of the Plan,  each  share of DDI Common
Stock  ("DDI  Common  Stock")  issued  and  outstanding  immediately  before the
effective time of the Merger was exchanged for  approximately  .148612 shares of
Registrant's  Common  Stock.  Pursuant to this exchange  ratio,  in the Merger a
total of 371,607 shares of Registrant's Common Stock were issued in exchange for
all of the outstanding DDI Common Stock.  In addition,  Registrant  assumed each
option to purchase DDI Common Stock outstanding immediately before the effective
time of the Merger.  Each DDI option is exercisable for that number of shares of
Registrant's Common Stock equal to .148612 multiplied by the number of shares of
DDI  Common  Stock  purchasable  under the DDI  options  immediately  before the
effective time of the Merger.  Pursuant to this exchange  ratio,  Registrant may
issue up to 131,862  shares of its Common  Stock upon  exercise  of the  assumed
options.  Assuming  exercise of all assumed  options,  Registrant may ultimately
issue a total of up to 503,469  shares of its Common Stock.  The exchange  ratio
was  determined  on the basis of, among other things (i) a comparison of certain
financial and stock market  information  for  Registrant  and certain  financial
information  for DDI  with  similar  types  of  information  for  certain  other
companies  in  businesses  similar  to  those  of  Registrant  and DDI and  (ii)
discussions  between  senior  management  of  Registrant  and DDI  regarding the
business and prospects of their respective companies.

                  The shares of Registrant's Common Stock received by the former
DDI  shareholders  have not been registered under the Securities Act of 1933, as
amended (the "1933  Act"),  in reliance  upon the  exemption  from  registration
provided by Section 3(a)(10) thereof.

                  In connection with the Merger,  ISI, Chemical Trust Company of
California,  as escrow agent,  and the former DDI  shareholders  entered into an
escrow agreement (the "Escrow  Agreement") under which ISI deposited into escrow
stock certificates  representing 10% of the shares of Registrant's  Common Stock
issuable  pursuant  to  the  Merger  and  will  deposit  10% of  the  shares  of
Registrant's  Common  Stock issued upon  exercise of the DDI options  assumed by
Registrant  (the "Escrow  Shares").  The Escrow Shares will be held in escrow as
collateral  for the  indemnification  obligations  of DDI under  the  Plan.  The
indemnification  obligations  of DDI will  expire (i) for items  expected  to be
encountered in the audit process, when ISI receives audited financial statements
together  with a report  thereon  from its  independent  auditors  covering  the
combined results of ISI and DDI for the ISI fiscal year ending February 29, 1996
(but no later than one year from the closing of the Merger),  provided  that ISI
has a  reasonable  period of time,  not to exceed 90 days,  to review  the audit
results to determine  if any claim  exists and must provide  notice of any claim
within  the 90 day  period  and (ii) for all other  items,  12 months  after the
closing of the Merger.

                  Contemporaneously   with  the  Merger,  Marco  Thompson,   the
President  and Chief  Executive  Officer of DDI,  entered  into  employment  and
noncompetition agreements with Registrant. The employment agreement provides for
a three-year  term of employment at a minimum  salary of $150,000 per year and a
target bonus of $125,000, payable upon achievement of certain agreed upon goals.
Upon termination of the employment  agreement by ISI for cause as defined in the
agreement,  all compensation and benefits payable under the employment agreement
are  payable  through  the date of  termination.  The  noncompetition  agreement
provides  that Mr.  Thompson  will not compete with  Registrant  for a period of
three years following the Merger.

                                      - 2 -
<PAGE>

                  In connection with the Merger,  Mr. Thompson also  transferred
to ISI  ownership  of the  building  in which a portion of the DDI  business  is
located and  terminated  DDI's lease of the premises,  in  consideration  of ISI
paying the outstanding debt on the property.  The number of shares issued to Mr.
Thompson in the Merger in exchange for his DDI Common Stock was reduced by 8,199
shares  or  $280,406,  which  is the  amount  that the  outstanding  debt on the
property exceeded the appraised current fair market value of the property.


ITEM 7:  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

(a)      Financial Statements of Businesses Acquired.

         The following Financial Statements of Doctor Design, Inc. are filed 
         herewith:

         Report of Independent Auditors
         Balance Sheets as of June 30, 1995 and 1994
         Statements  of  Income  for the  years  ended  June  30,  1995 and 1994
         Statements  of  Shareholders'  Equity for the years ended June 30, 1995
         and 1994
         Statements of Cash Flows for the years ended June 30, 1995 and 1994
         Notes  to  Financial   Statements  
         Note  to  Unaudited  Financial information  
         Unaudited Balance Sheets as of September 30, 1995 and June 30, 1995
         Unaudited  Statements  of  Income  for  the  three-month  period  ended
         September 30, 1995 and 1994
         Unaudited  Statements  of Cash Flows for the  three-month  period ended
         September 30, 1995 and 1994

(b)      Pro Forma Financial Information.

         The following  unaudited pro forma  combined  financial  information is
         filed herewith:

         Pro Forma Combined Balance Sheet as of November 30, 1995
         Pro Forma Combined Statements of Income for the nine-month period ended
         November 30, 1995 and 1994 and the years ended February 28, 1995,  1994
         and 1993
         Notes to Unaudited Pro Forma Combined Financial Statements


(c)      Exhibits.

         The following exhibits are filed herewith:

2.01     Agreement and Plan of Reorganization  dated as of December 14, 1995, as
         amended as of January 26, 1996, by and among Registrant, ISI Purchasing
         Corporation and Dr. Design, Inc. and related documents.

2.02     Agreement  of Merger  dated as of January  26,  1996 by and between ISI
         Purchasing Corporation and Dr. Design, Inc.

23.01    Consent of McGladrey & Pullen, LLP






                                      - 3 -


<PAGE>






                                    SIGNATURE



                  Pursuant to the requirements of the Securities Exchange Act of
1934,  Registrant  has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.





                                               INTEGRATED SYSTEMS, INC.




Date:  February 8, 1996                        By:  /s/  Steven Sipowicz
                                                   ---------------------
                                                         Steven Sipowicz
                                                         Chief Financial Officer



































                                      - 4 -

<PAGE>

ITEM 7(A):        FINANCIAL STATEMENTS OF BUSINESS ACQUIRED.

                         Report of Independent Auditors


To the Board of Directors
Doctor Design, Inc.
San Diego, California

We have audited the  accompanying  balance sheets of Doctor  Design,  Inc. as of
June 30, 1995 and 1994,  and the  related  statements  of income,  shareholders'
equity, and cash flows for the years then ended. These financial  statements are
the responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material respects,  the financial position of Doctor Design, Inc. as of June
30, 1995 and 1994,  and the results of its operations and its cash flows for the
years then ended in conformity with generally accepted accounting principles.





/s/ McGladrey & Pullen, LLP




San Diego, California
November 17, 1995

<PAGE>

<TABLE>

DOCTOR DESIGN, INC.

BALANCE SHEETS
JUNE 30, 1995 AND 1994

<CAPTION>

ASSETS (NOTE 5)                                                        1995          1994
- ---------------------------------------------------------------------------------------------
<S>                                                                  <C>          <C>
Current Assets
     Cash and cash equivalents                                       $  104,182   $   10,566
     Contract receivables, net of allowance for doubtful
          accounts of $14,000 in 1995 and $14,609 in 1994 (Note 7)    1,982,061      499,933
     Royalty receivables (Note 11)                                      190,337       95,938
     Costs and estimated earnings in excess of billings
          on uncompleted contracts (Note 2)                             234,782      107,476
     Prepaid expenses and other                                          95,494       61,942
                                                                     ------------------------
          Total current assets                                        2,606,856      775,855
                                                                     ------------------------

          Property and Equipment, net (Note 3)                          562,715      196,803
                                                                     ------------------------


Software Development Costs, net of accumulated
  amortization of $735,486 in 1994                                                   213,677
                                                                     ------------------------

                                                                     $3,169,571   $1,186,335
                                                                     ========================

<FN>
See Notes to Financial Statements.
</FN>
</TABLE>


                                      -2-
<PAGE>

<TABLE>
<CAPTION>


LIABILITIES AND SHAREHOLDERS EQUITY                                        1995           1994
- ----------------------------------------------------------------------------------------------------
<S>                                                                     <C>            <C>
Current Liabilities
     Current maturities of long-term debt (Note 5)                      $   116,688    $   180,113
     Accounts payable                                                       539,811         56,811
     Accrued liabilities (Note 4)                                           419,566        211,598
     Billings in excess of costs and estimated earnings on
          uncompleted contracts (Note 2)                                     31,840         81,800
     Income taxes payable                                                    73,200
     Deferred income taxes (Note 6)                                         627,000         40,000
                                                                       ---------------------------
          Total current liabilities                                       1,808,105        570,322
                                                                       ---------------------------

     Deferred Revenue (Note 7)                                                              77,942
                                                                       ---------------------------

     Deferred Income Taxes (Note 6)                                                         65,000
                                                                       ---------------------------

     Long-term Debt, less current maturities (Note 5)                                      115,253
                                                                       ---------------------------

Commitments (Note 9)

Shareholders' Equity (Note 8)
     Preferred, no par value, 3,000,000 shares authorized;
          no shares issued and outstanding

Common:
     Class A, voting common stock, no par value, 5,000,000
          shares authorized; 2,555,720 shares issued and outstanding        173,942        173,942


     Class B, nonvoting common stock, no par value,  1,000,000 shares
          authorized;  no shares issued and outstanding
     Note receivable from shareholder                                       (15,320)       (15,320)
     Retained earnings                                                    1,202,844        199,196
                                                                       ---------------------------
                                                                          1,361,466        357,818
                                                                       ---------------------------

                                                                        $ 3,169,571    $ 1,186,335
                                                                       ===========================

</TABLE>







                                       -3-


<PAGE>

<TABLE>


DOCTOR DESIGN, INC.

STATEMENTS OF INCOME
YEARS ENDED JUNE 30, 1995 AND 1994

<CAPTION>

                                                              1995              1994
- --------------------------------------------------------------------------------------
<S>                                                        <C>            <C>
Contract revenue (Note 7)                                  $ 8,814,615    $ 4,280,969
Royalty and other revenue (Note 11)                            684,103        210,281
                                                           --------------------------
          Total revenue                                      9,498,718      4,491,250
                                                           --------------------------

Cost of revenue                                              5,744,878      2,808,217
                                                           --------------------------
          Gross profit                                       3,753,840      1,683,033
                                                           --------------------------

Selling, general and administrative expenses:
     General and administrative (including related party
          rental payments of $144,000 for 1995 and 1994)     1,520,752        703,905
     Selling and marketing                                     507,068        230,345
     Research and development                                   26,556         55,930
                                                           --------------------------
                                                             2,054,376        990,180
                                                           --------------------------

          Operating income                                   1,699,464        692,853
                                                           --------------------------

Nonoperating income (expense):
     Interest income                                            22,218          3,076
     Interest expense (including related party payments
          of $10,000 for 1994)                                 (22,034)       (55,175)
     Other                                                                     15,332
                                                           --------------------------
                                                                   184        (36,767)
                                                           --------------------------
          Income before provision for income taxes           1,699,648        656,086

     Provision for income taxes (Note 6)                       696,000        100,784
                                                           --------------------------
          Net income                                       $ 1,003,648    $   555,302
                                                           ==========================

<FN>
See Notes to Financial Statements.
</FN>
</TABLE>

                                      -4-
<PAGE>

<TABLE>

DOCTOR DESIGN, INC.

STATEMENTS OF SHAREHOLDERS' EQUITY
YEARS ENDED JUNE 30, 1995 AND 1994
<CAPTION>

                                    Common Stock                    Note          
                                   Class A Voting                Receivable          Retained
                           -------------------------------          from             Earnings
                               Shares          Amount            Shareholder         (Deficit)           Totals
- -----------------------------------------------------------------------------------------------------------------
<S>                            <C>               <C>              <C>               <C>                <C>
Balance, June 30, 1993         2,079,618         $ 78,722         $                 $ (356,106)        $(277,384)
     Net income                                                                        555,302           555,302
     Stock options exercised     476,102           95,220          (15,320)                               79,900
                           --------------------------------------------------------------------------------------
Balance, June 30, 1994         2,555,720          173,942          (15,320)            199,196           357,818
     Net income                                                                      1,003,648         1,003,648
                           --------------------------------------------------------------------------------------
Balance, June 30, 1995         2,555,720         $173,942         $(15,320)         $1,202,844        $1,361,466
                           ======================================================================================
<FN>
See Notes to Financial Statements.
</FN>
</TABLE>












                                      -5-


<PAGE>

<TABLE>


DOCTOR DESIGN, INC.

STATEMENTS OF CASH FLOWS
YEARS ENDED JUNE 30, 1995 AND 1994

<CAPTION>

                                                                                    1995              1994
- ----------------------------------------------------------------------------------------------------------------
<S>                                                                                <C>                 <C>
Cash Flows from Operating Activities
     Net income                                                                   $1,003,648          $555,302
     Adjustments to reconcile net income to net cash
          provided by operating activities:
          Depreciation and amortization                                              404,019           293,958
          Gain on lease assignment                                                                     (10,208)
          Deferred income taxes                                                      522,000            99,984
          (Increase) decrease in:
               Contract receivables                                               (1,482,128)         (354,300)
               Royalty receivables                                                   (94,399)          (95,938)
               Costs and estimated earnings in excess of billings on
                    uncompleted contracts                                           (127,306)          (77,592)
               Prepaid expenses and other                                            (33,552)            7,354
          Increase (decrease) in:
               Accounts payable                                                      483,000          (205,754)
               Accrued liabilities                                                   207,968           (51,430)
               Income taxes payable                                                   73,200
               Billings in excess of costs and estimated earnings on
                    uncompleted contracts                                            (49,960)           62,211
               Deferred revenue                                                      (77,942)          (53,978)
                                                                           -------------------------------------
                    Net cash provided by operating activities                        828,548           169,609
                                                                           -------------------------------------

Cash Flows from (used in) Investing Activities
     Purchases of property and equipment                                            (556,254)         (108,571)
                                                                           -------------------------------------
                    Cash (used in) investing activities                             (556,254)         (108,571)
                                                                           -------------------------------------

Cash Flows from (used in) Financing Activities
     Principal payments on long-term debt                                           (178,678)         (231,526)
     Proceeds from exercise of stock options                                                            79,900
                                                                           -------------------------------------
                    Net cash (used in) investing activities                         (178,678)         (151,626)
                                                                           -------------------------------------
<FN>
See Notes to Financial Statements.
</FN>
</TABLE>

   

                                   -6-
<PAGE>


<TABLE>

DOCTOR DESIGN, INC.

STATEMENTS OF CASH FLOWS (CONTINUED)
YEARS ENDED JUNE 30, 1995 AND 1994

<CAPTION>

                                                                                     1995              1994
- -----------------------------------------------------------------------------------------------------------------
<S>                                                                                   <C>              <C>
Net increase (decrease) in cash and cash equivalents                                  $ 93,616         $ (90,588)

Cash and cash equivalents:
    Beginning                                                                           10,566           101,154
                                                                            -------------------------------------
    Ending                                                                            $104,182         $  10,566
                                                                            =====================================

Supplemental Disclosures of Cash Flow Information
Cash payments for:
      Interest                                                                        $ 23,820         $  59,257
      Income taxes                                                                    $100,800         $  42,800

Supplemental Schedule of Noncash Investing and
      Financing Activities
            Capital lease obligations incurred for the use of equipment               $                $  19,737

<FN>
See Notes to Financial Statements.
</FN>

</TABLE>

                                      -7-
<PAGE>


NOTE 1.  NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

NATURE OF BUSINESS

Doctor Design,  Inc. (the  "Company")  provides  engineering  design services to
manufacturers of high technology products. For certain design service contracts,
the Company retains commercialization or proprietary rights to the technology it
has developed for the customer. The Company is also involved in the sale of high
technology  products  to  design  service  customers  which  include  internally
developed software applications.

A summary of the Company's significant accounting policies follows:

REVENUE RECOGNITION

Revenue is recognized  based on the type of contract.  Revenue earned under time
and material contracts is recognized on the basis of hours of work performed and
hourly rates provided under the contract.  Revenue from fixed-price contracts is
recognized on the percentage-of-completion method, measured by the percentage of
total  hours  incurred  to date  to  estimated  total  hours  of each  contract.
Management  believes that these methods  provide the best  available  measure of
progress on these contracts.

Contract  costs include all direct  material and labor costs and those  indirect
costs  related to contract  performance,  such as indirect  labor and  supplies.
Selling,  general and  administrative  costs are charged to expense as incurred.
Provisions for estimated losses on uncompleted  contracts are made in the period
in which such losses are determined.  Changes in contract performance,  contract
conditions,  and  estimated  profitability  may result in revisions to costs and
income and are recognized in the period in which the revisions are determined.

The asset,  "Costs and estimated  earnings in excess of billings on  uncompleted
contracts,"  represents  revenue  recognized  in excess of amounts  billed.  The
liability,  "Billings in excess of costs and estimated  earnings on  uncompleted
contracts," represents billings in excess of revenue recognized.

Revenue is deferred for future  recognition  when a  contractual  obligation  to
provide  services or a third  party's  right to developed  assets  exists.  Such
revenue is  recognized  as the  contractual  obligation  or third party right is
satisfied.

CASH AND CASH EQUIVALENTS

Cash and cash  equivalents  include  highly  liquid  investments  with  original
maturities of three months or less.

The Company  maintains its cash accounts in two commercial banks and a brokerage
account located in San Diego,  California.  The two commercial bank accounts are
insured by Federal Deposit Insurance  Corporation (FDIC) up to $100,000 each. At
June 30, 1995,  the Company had  balances of  approximately  $422,000  that were
either uninsured or in excess of the FDIC insurance limit.

PROPERTY AND EQUIPMENT

Property and equipment is stated at cost. Depreciation of property and equipment
used in production of the Company's hand-held computer product is computed using
the  units-of-production  method over the estimated number of units which can be
produced  with the assets.  Depreciation  of other  property  and  equipment  is
computed using the straight-line  method over estimated useful lives of three to
five years. Maintenance and repair costs are expensed as incurred.

                                      -8-

<PAGE>


SOFTWARE DEVELOPMENT COSTS

Software  development  costs,  as an  integral  part of the  development  of the
Company's hand-held computer and graphics display  controller,  were capitalized
once  the  technological  feasibility  of the  specific  software  projects  was
established.  Capitalization  of such costs  ceased  when the final  product was
fully tested and available for general  distribution to customers.  Amortization
of capitalized  software  development costs began when the product was ready for
general distribution to customers.  Amortization is computed based on the number
of units  delivered  compared with the number of estimated units to be delivered
or the straight-line  method over the remaining  estimated  economic life of the
product,  whichever  provides  a  shorter  amortization  period.  The  estimated
economic life of the hand-held computer was five years. All software development
costs have been fully amortized at June 30, 1995.

Other research and development costs are charged to expense when incurred.

INCOME TAXES

Deferred taxes are provided on a liability  method  whereby  deferred tax assets
are recognized for deductible  temporary  differences and operating loss and tax
credit  carryforwards  and deferred tax  liabilities  are recognized for taxable
temporary  differences.  Temporary  differences are the differences  between the
reported  amounts of assets and  liabilities  and their tax bases.  Deferred tax
assets are reduced by a valuation  allowance when, in the opinion of management,
it is more likely than not that some  portion or all of the  deferred tax assets
will not be realized.  Deferred tax assets and  liabilities are adjusted for the
effects of changes in tax laws and rates on the date of enactment.

<TABLE>

NOTE 2.  COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS

Costs and estimated earnings on uncompleted  contracts at June 30, 1995 and 1994
consist of the following:
<CAPTION>

                                                                    1995              1994
                                                                  ---------------------------
<S>                                                               <C>            <C>
Costs incurred on uncompleted contracts                           $   587,877    $ 2,462,776
Estimated earnings                                                    250,782        947,960
                                                                  ---------------------------
                                                                      838,659      3,410,736
Less billings to date                                                (748,399)    (3,385,060)
                                                                  ---------------------------
                                                                       90,260         25,676

Net under billings on time and material prototype contracts           112,682
                                                                  ---------------------------
                                                                  $   202,942    $    25,676
                                                                  ===========================

Included in the accompanying balance sheets under
     the following captions:
          Cost and estimated earnings in excess of  billings on
               uncompleted contracts                              $   234,782    $   107,476
          Billings in excess of costs and estimated earnings on
               uncompleted contracts                                  (31,840)       (81,800)
                                                                  ---------------------------
                                                                  $   202,942    $    25,676
                                                                  ===========================
</TABLE>

                                      -9-


<PAGE>


NOTE 3.  PROPERTY AND EQUIPMENT

Property and equipment at June 30, 1995 and 1994 consist of the following:

                                                  1995              1994
                                             ------------------------------
Computer equipment                             $ 766,136         $ 257,256
Office furniture and equipment                   232,651           185,277
Product tooling and molds                                          166,990
                                             ------------------------------
                                                 998,787           609,523
Less accumulated depreciation and amort          436,072           412,720
                                             ------------------------------
                                               $ 562,715         $ 196,803
                                             ==============================

NOTE 4.  ACCRUED LIABILITIES

Accrued liabilities at June 30, 1995 and 1994 consist of the following:

                                                   1995              1994
                                        ------------------------------------
Accrued employee costs and benefits              $191,115          $166,379
Accrued contract losses                           138,321             5,600
Customer advances                                  16,700            16,885
Sales tax payable                                  35,545            15,426
Other                                              37,885             7,308
                                        ------------------------------------
                                                 $419,566           211,598
                                        ====================================

NOTE 5.  LONG-TERM DEBT

The Company has a note payable to a bank,  $30,773 and $128,227 at June 30, 1995
and 1994,  respectively,  due in  monthly  principal  payments  of  $8,120  plus
interest  at the bank's  prime rate (9.0% at June 30,  1995) plus 3.75%  through
September  1995.  The  note  is  collateralized  by  the  Company's  assets  and
guaranteed by the majority shareholder.

The Company has a note  payable to a bank,  $12,908 and $48,471 at June 30, 1995
and 1994, respectively, due in monthly payments of $3,315, including interest at
13.0%, through November 1995. The note is collateralized by the Company's assets
and guaranteed by the majority shareholder.

The  Company has a note  payable  $73,007 and $66,771 at June 30, 1995 and 1994,
respectively,  bearing interest at 8.5%,  principal and interest  payments based
upon 50% of certain royalties  received by the Company.  Subsequent to year-end,
the note was renegotiated  and the remaining  balance due of $45,000 was paid in
full by October 31, 1995.

The Company also had various other  arrangements,  totaling  $51,897 at June 30,
1994 which were paid off during the year ended June 30, 1995.

NOTE 6.  INCOME TAXES

The income tax provision  charged to continuing  operations  for the years ended
June 30, 1995 and 1994 was as follows:

                                           1995               1994
                                      -------------------------------
Current:
     U.S. federal                        $ 132,000         $  24,000
     State                                  42,000            15,000

Deferred:
     U.S. federal                          400,000            48,000
     State                                 122,000            13,784
                                      -------------------------------
                                         $ 696,000         $ 100,784
                                      ===============================

    
                                  -10-
<PAGE>

<TABLE>

The income tax  provision  differs from the amount of income tax  determined  by
applying  the U.S  federal  income  tax rate to pretax  income  from  continuing
operations for the years ended June 30, 1995 and 1994 due to the following:
<CAPTION>

                                                                     1995             1994
                                                               -------------------------------
<S>                                                               <C>              <C>
Computed "expected" tax expense                                   $ 578,000        $ 223,000
Increase (decrease) in income taxes resulting from:
 Reduction in valuation allowance                                                   (153,000)
Nondeductible expenses                                                5,000            3,000
State income taxes, net of federal tax benefit                      104,000           40,000
Other                                                                 9,000          (12,216)
                                                               -------------------------------
                                                                  $ 696,000        $ 100,784
                                                               ===============================
</TABLE>


Net deferred tax liabilities consist of the following  components as of June 30,
1995 and 1994:

                                                   1995               1994
                                              ------------------------------
Deferred tax liabilities:                                         
     Accrual to cash basis                      $ 635,000         $ 167,000
     Software development costs                                      86,000
                                                                  
Deferred tax assets:                                              
     Allowance for doubtful accounts                                 (6,000)
     Depreciation                                  (8,000)          (20,000)
     Net operating loss carryforward                                (38,000)
     Tax credits                                                    (84,000)
                                              ------------------------------
                                                $ 627,000         $ 105,000
                                              ==============================
                                                                  
                                                               
The components  giving rise to the net deferred tax liabilities  described above
have been included in the  accompanying  balance  sheets as of June 30, 1995 and
1994 as follows:

                                     1995               1994
                                 ---------------------------------
Current (liabilities)              $  (627,000)        $ (40,000)
Noncurrent (liabilities)                                 (65,000)

                                 ---------------------------------
                                   $  (627,000)        $(105,000)
                                 =================================

<TABLE>

NOTE 7.  MAJOR CUSTOMERS

Contract  revenue  and  receivables  for the years  ended June 30, 1995 and 1994
include revenue and  receivables  from the following  major  customers,  each of
which accounted for 10% or more of total contract  revenue of the Company during
at least one of the years.
<CAPTION>

                               1995                                 1994
- ----------------------------------------------------------------------------------------
                                       Contract                             Contract
                     Contract         Receivables         Contract         Receivables
                      Revenue           Balance           Revenue            Balance
- ----------------------------------------------------------------------------------------
<S>                  <C>                 <C>               <C>            <C>
Customer A           $ 2,495,000         $  443,000        $     *        $    *
Customer B             2,324,000            564,000         1,850,000       71,000
Customer C             1,183,000            239,000              *             *
Customer D               964,000            389,000              *             *
                 -----------------------------------------------------------------------
                     $ 6,966,000         $1,635,000        $1,850,000     $ 71,000
                 =======================================================================

<FN>
*Contract  revenue  accounted  for less than 10% of total  contract  revenue for
1994.

</FN>
</TABLE>

                                      -11-
<PAGE>

Customer B also  provided  funding for and holds certain  contractual  rights to
assets developed by the Company,  consisting mainly of tooling and molds for the
production  of its  hand-held  computer.  Accordingly,  the Company had deferred
recognition  of revenue  representing  the  depreciated  value of the associated
assets.  At June 30, 1995, the assets were fully depreciated and all revenue has
been recognized.

The Company retains the right to further  commercialize the software  technology
developed in connection  with this  arrangement for application in certain other
industries.

NOTE 8.  EMPLOYEE STOCK OPTIONS

The Company has a stock option plan (the "Plan") which provides for the granting
of both qualified and non-qualified options to employees,  directors and outside
consultants  of the Company.  Options are  exercisable  at various dates through
June  2003.  The terms of the Plan  provide  for the  granting  of options at an
exercise  price  approximating  the fair market  value of the  Company's  common
stock, as determined by the Option  Committee of the Board of Directors,  on the
date of the grant of such options.  Under the Plan options for 1,500,000  shares
may be granted.  The options vest over periods  ranging from 0 to 4 years and at
June 30, 1995 and 1994,  options for 431,959 and 347,925  shares,  respectively,
were exercisable and options for 234,205 and 530,705 shares, respectively,  were
available for future grant.  Subsequent to June 30, 1995, an additional  134,000
options were granted at $0.40 per share.

In November 1993, the Company  accepted a nonrecourse note receivable as payment
for stock options  exercised.  This note is non interest  bearing and is due and
payable on December 31, 1996. At June 30, 1995, the 76,602 shares related to the
exercise were issuable and included in the shares outstanding.

Transactions for the years ended June 30, 1995 and 1994 comprise the following:

                                                        1995            1994
                                                ------------------------------
Options outstanding, beginning of year                 456,943        832,553
Granted                                                308,500        357,000
Exercised                                                            (476,102)
Expired                                                (12,000)      (256,508)
                                                ------------------------------
Options outstanding, end of year                       753,443        456,943
                                                ==============================

Options price range at June 30, 1995 and 1994     $.20 to 0.40          0.20

NOTE 9.  COMMITMENTS

OPERATING LEASES

The Company leases its main office facility from the majority  shareholder under
a  noncancelable  operating  lease  agreement.  The  term  of the  lease,  which
commenced in January 1989, is ten years with two five-year options.  The Company
has guaranteed the payment of the majority shareholder's note payable to a bank;
balance of $403,538 at June 30, 1995,  which is secured by the second trust deed
on this facility. The balance of the debt subject to the guaranty is included in
the minimum lease payments shown below for 1999.

The Company also leases four other office  facilities  under separate  operating
lease  agreements.  The  aggregate  monthly  rental  payment for these leases is
approximately  $8,800. The lease agreements expire in September 1996 and include
options to extend the terms of the  leases.  Rental  expense  was  $189,000  and
$144,000 for the years ended June 30, 1995 and 1994, respectively.

                                      -12-
<PAGE>



Future  minimum  lease  payments  for  operating  leases at June 30, 1995 are as
follows:



YEAR ENDING JUNE 30,
- -------------------------------------------------------------
1996                                      $          247,836
1997                                                 185,803
1998                                                 144,000
1999                                                 417,500
                                         --------------------
Total minimum lease payments              $          995,139
                                         ====================


NOTE 10. PROFIT SHARING PLAN

The Company has a deferred compensation and profit sharing plan as defined under
section  401(k)  of the  Internal  Revenue  Code.  Under  the terms of the Plan,
employees  may  defer a  portion  of  their  compensation  each  year  based  on
provisions as outlined in the Plan.  The Plan was amended in the current year to
implement an employer matching contribution equal to a discretionary  percentage
to be determined by the employer.  Current matching  contributions are $0.50 for
every $1.00 contributed by all eligible  participants  beginning January 1, 1995
and ending September 30, 1995. Total employer  contributions  for the year ended
June 30, 1995 were $15,372.

NOTE 11. ROYALTY AGREEMENTS

The Company has entered into a royalty  agreement with a customer for the design
and  development  of certain  products.  Under the terms of the  agreement,  the
Company  receives a  percentage  of the net selling  price of  products  sold to
third-parties  utilizing this  technology  Royalties are calculated on a sliding
scale as a percentage of total revenues ranging from 4% to 2%. In addition,  the
Company has numerous other royalty agreements with other customers under similar
arrangements.  Royalty revenue totaled $606,161 and $163,361,  respectively, for
the years ending June 30, 1995 and 1994.

NOTE 12. SUBSEQUENT EVENT

On November 10, 1995,  Integrated  Systems,  Inc. (ISI) and the Company signed a
Letter of Intent for the  acquisition of the Company by ISI. The principal terms
of the Letter of Intent  stipulate  that the Company will become a  wholly-owned
subsidiary  of ISI as the Company will exchange all of its  outstanding  capital
stock and stock options for ISI common stock.

The Letter of Intent does not constitute an offer,  it is not binding and is not
a definitive agreement. All rights and obligations of the parties are subject to
execution of  definitive  mutually  satisfactory  agreements  and  obtaining all
required  corporate  and  regulatory  approvals.   The  Letter  of  Intent  will
automatically  terminate  if a  definitive  agreement  is not  entered  into  by
December 25, 1995.


                                      -13-
<PAGE>

UNAUDITED FINANCIAL STATEMENTS.

         Note to Unaudited Financial Information

         The condensed  interim financial  statements  included herein have been
prepared by Doctor  Design,  Inc.  without  audit.  The June 30, 1995  condensed
balance sheet data was derived from the audited financial  statements,  but does
not  include  all  disclosures   required  by  generally   accepted   accounting
principles.

         The  accompanying  condensed  interim  financial  statements  have been
prepared in all material respects in conformity with the standards of accounting
measurements set forth in Accounting Principles Board Opinion No. 28 and, in the
opinion  of  management,  reflect  all  adjustments,  consisting  only of normal
recurring  adjustments,  necessary to summarize  fairly the financial  position,
results of operations,  and cash flows for the periods indicated. The results of
operations for the interim periods are not necessarily indicative of the results
to be expected for the full year.



<PAGE>

<TABLE>
                           DOCTOR DESIGN INCORPORATED
                            UNAUDITED BALANCE SHEETS
                   AS OF SEPTEMBER 30, 1995 AND JUNE 30, 1995
                                                
<CAPTION>
                                                
                                                      September 30,     June 30,              
                                                           1995           1995            
                                                       -----------    -----------
<S>                                                    <C>            <C>
ASSETS

Current assets:
     Cash and cash equivalents                         $   950,366    $   104,182
     Accounts receivable, net of reserve                 1,345,991      2,172,398
     Costs and profits in excess of billings               490,328        234,782
     Other current assets                                   78,660         95,494
                                                       -----------    -----------
          Total current assets                           2,865,345      2,606,856

Property and equipment, net                                609,913        562,715
                                                       -----------    -----------
                                                       $ 3,475,258    $ 3,169,571
                                                       ===========    ===========


LIABILITIES AND SHAREHOLDERS' EQUITY

Current liabilities:
     Accounts payable                                  $   644,562    $   539,811
     Billings in excess of costs and profits                16,173         31,840
     Notes payable                                          18,278        116,688
     Income taxes payable                                  458,000         73,200
     Deferred income taxes payable                         297,000        627,000
     Other current liabilities                             463,730        419,566
                                                       -----------    -----------
          Total current liabilities                      1,897,743      1,808,105

Shareholders' equity:
     Common stock                                          173,942        173,942
     Note receivable from shareholder                      (15,320)       (15,320)
     Retained earnings                                   1,418,893      1,202,844
                                                       -----------    -----------
          Total shareholders' equity                     1,577,515      1,361,466
                                                       -----------    -----------
          Total liabilities and shareholders' equity   $ 3,475,258    $ 3,169,571
                                                       ===========    ===========
</TABLE>


<PAGE>




                           DOCTOR DESIGN INCORPORATED
                         UNAUDITED STATEMENTS OF INCOME
                        FOR THE THREE-MONTH PERIOD ENDED
                           SEPTEMBER 30, 1995 AND 1994
                                                
                                                
                                                         1995            1994 
                                                    -----------     -----------
Revenues                                            $ 2,410,828     $ 1,064,511
 
Costs and expenses:
     Cost of revenues                                 1,518,329         704,767
     Selling and marketing                              113,494          66,060
     General and administrative                         470,605         190,015
                                                    -----------     -----------
          Total costs and expenses                    2,101,428         960,842

Income from operations                                  309,400         103,669

Interest income (expense) and other, net                 41,449          (6,985)
                                                    -----------     -----------

Income before provision for income taxes                350,849          96,684

Provision for income taxes                              134,800          41,000
                                                    -----------     -----------

Net income                                          $   216,049     $    55,684
                                                    ===========     ===========


<PAGE>

<TABLE>

                           DOCTOR DESIGN INCORPORATED
                       UNAUDITED STATEMENTS OF CASH FLOWS
                        FOR THE THREE-MONTH PERIOD ENDED
                           SEPTEMBER 30, 1995 AND 1994
                                                
<CAPTION>
                                                
                                                               1995            1994            
                                                           -----------    -----------
<S>                                                        <C>            <C>
Cash flows from operating activities:
Net income                                                 $   216,049    $    55,684
Adjustments to reconcile net income to net
     cash provided by operating activities:
     Depreciation and amortization                              65,007         37,044
     Deferred income taxes                                    (330,000)        41,000
     Gain on early debt extinguishment                         (28,007)
     Changes in operating accounts:
          Accounts receivable                                  826,407       (110,167)
          Costs and profits in excess of billings             (255,546)       (25,560)
          Other current assets                                  28,545         (5,732)
          Accounts payable                                     104,751        156,271
          Billings in excess of costs and profits              (15,667)       (28,588)
          Income taxes payable                                 384,800
          Other current liabilities                             44,165         (4,796)
                                                           -----------    -----------
               Net cash provided by operating activities     1,040,504        115,156

Cash flows used for investing activities:
Purchases of property and equipment                           (112,205)       (10,866)
Increase in deposits and other assets                          (11,712)
                                                           -----------    -----------
               Net cash used for investing activities         (123,917)       (10,866)

Cash flows used for financing activities:
Payments on long-term debt                                     (70,403)       (43,856)
                                                           -----------    -----------
               Net cash used for financing activities          (70,403)       (43,856)

Net cash flow                                                  846,184         60,434

Cash at begining of period                                     104,182         10,566
                                                           -----------    -----------
Cash at end of period                                      $   950,366    $    71,000
                                                           ===========    ===========

</TABLE>

<PAGE>

ITEM 7 (B):  PRO FORMA FINANCIAL INFORMATION.

         Unaudited Pro Forma Combined Financial Statements

         The following  unaudited pro forma condensed data,  including the notes
thereto,  are qualified in their entirety by reference to, and should be read in
conjunction  with,  the  historical  financial  statements of Doctor Design Inc.
included elsewhere in this Form 8-K and the consolidated financial statements of
Integrated  Systems,  Inc.  The  unaudited  pro  forma  combined  statements  of
operations combine Doctor Design's results of operations and Integrated Systems'
results of operations  for the nine months ended  November 30, 1995 and 1994 and
the three years ended February 28, 1995,  giving effect to the acquisition as if
it had occurred at March 1, 1992. The unaudited pro forma combined balance sheet
data  combine  Doctor  Design's and  Integrated  System's  balance  sheets as of
November 30 1995,  giving  effect to the  acquisition  as if it had  occurred on
November 30, 1995.

         The Pro Forma  Financial  Information  is  presented  for  illustrative
purposes only and is not  necessarily  indicative  of the  operating  results or
financial position that would have occurred had the acquisition been consummated
at the beginning of the periods presented,  nor is it necessarily  indicative of
future operating results or financial position.



<PAGE>

<TABLE>
                                                        PRO FORMA STATEMENT
                                          INTEGRATED SYSTEMS, INC. AND DOCTOR DESIGN, INC.
                                                            STATEMENT #1
                                                  PRO FORMA COMBINED BALANCE SHEET
                                                      AS OF NOVEMBER 30, 1995

Includes Doctor Design as of September 30, 1995 and                                                           
Integrated Systems, Inc. as of November 30, 1995                                                              
                                                                
(in thousands)  

<CAPTION>
                                                                             Doctor                      Pro Forma         Pro Forma
                                                                             Design          ISI         Adjustments       Combined
                                                                            --------        --------     -----------        --------
<S>                                                                         <C>              <C>            <C>             <C>
Current assets:
     Cash and cash equivalents                                              $    950        $ 10,162                        $ 11,112
     Marketable securities                                                                    16,192                          16,192
     Accounts receivable, net                                                  1,836          17,100                          18,936
     Deferred income taxes                                                                       852                             852
     Other current assets                                                         79           2,334                           2,413
                                                                            --------        --------        --------        --------
          Total current assets                                                 2,865          46,640                          49,505

Marketable securities                                                                         19,590                          19,590
Property and equipment                                                           610           3,578             838           5,026
Other assets                                                                                     790                             790
Intangible assets                                                                              1,994                           1,994
                                                                            --------        --------        --------        --------
          Total assets                                                      $  3,475        $ 72,592        $    838        $ 76,905
                                                                            --------        --------        --------        --------

Current liabilities:
     Accounts payable                                                       $    645        $  2,222                        $  2,867
     Accrued payroll and related expenses                                        464           2,124                           2,588
     Deferred revenue                                                             16           7,466                           7,482
     Notes payable                                                                18                                              18
     Income taxes payable                                                        458           2,852                           3,310
     Deferred income taxes                                                       297                                             297
     Other current liabilities                                                                 3,491             500           3,991
                                                                            --------        --------        --------        --------
          Total current liabilities                                            1,898          18,155             500          20,553
                                                                            --------        --------        --------        --------
Other liabilities                                                                                451             781           1,232

Common stock                                                                     174          37,780                          37,954
Note receivable from shareholder                                                 (15)                                           (15)
Unrealized holding gain                                                                          341                             341
Retained earnings                                                              1,418          15,865            (443)         16,840
                                                                            --------        --------        --------        --------
          Total shareholders' equity                                           1,577          53,986            (443)         55,120
                                                                            --------        --------        --------        --------
          Total liabilities and shareholders' equity                        $  3,475        $ 72,592        $    838        $ 76,905
                                                                            ========        ========        ========        ========


</TABLE>
<PAGE>

<TABLE>


                                                        PRO FORMA STATEMENTS
                                          INTEGRATED SYSTEMS, INC. AND DOCTOR DESIGN, INC.
                                                            STATEMENT #2
                                       COMBINED STATEMENTS OF INCOME FOR THE NINE-MONTH PERIOD
                                                  ENDED NOVEMBER 30, 1995 AND 1994
                                                                                                                                
                                                                                                                                
Includes Doctor Design for the nine months ended September 30, 1995 and 1994 and Integrated Systems,  Inc. for the nine months ended
November 30, 1995 and 1994
                                                                                                                                
<CAPTION>
                                                                                                                                
                                                            1995                                           1994
                                            -------------------------------------------   ------------------------------------------
(in thousands)                                 Doctor             Pro Forma   Pro Forma    Doctor               Pro Forma  Pro Forma
                                               Design     ISI     Adjustments  Combined    Design       ISI    Adjustments  Combined
                                            --------   --------   --------    ---------   -------    --------   --------    --------
<S>                                         <C>        <C>        <C>         <C>        <C>         <C>        <C>         <C>     
Revenue                                     $  8,314   $ 50,648               $ 58,962   $  2,930    $ 36,266               $ 39,196

Costs and expenses:
  Cost of revenue                              5,215     11,978                 17,193      1,814       8,230                 10,044
  Selling and marketing                          475     18,478                 18,953        146      14,332                 14,478
  Research and development                                8,229                  8,229         30       5,874                  5,904
  General and administrative                   1,422      4,178        (74)      5,526        570       2,678        (74)      3,174
  Amortization                                              449                    449                  1,123                  1,123
  Merger related expenses                                 3,601                  3,601
                                            --------   --------   --------    --------   --------    --------   --------    --------

     Total costs and expenses                  7,112     46,913        (74)     53,951      2,560      32,237        (74)     34,723
                                            --------   --------   --------    --------   --------    --------   --------    --------

Income from operations                         1,202      3,735         74       5,011        370       4,029         74       4,473

Interest and other income                         52      1,727        (60)      1,719        (23)      1,302        (60)      1,219
                                            --------   --------   --------    --------   --------    --------   --------    --------

      Pretax income                            1,254      5,462         14       6,730        347       5,331         14       5,692

Income taxes                                     512      1,748          2       2,262        141       1,706          2       1,849
                                            --------   --------   --------    --------   --------    --------   --------    --------

      Net income                            $    742   $  3,714   $     12    $  4,468   $    206    $  3,625   $     12    $  3,843
                                            ========   ========   ========    ========   ========    ========   ========    ========

Earnings per share                          $   1.50   $   0.35               $   0.41   $   0.42    $   0.38               $   0.38
                                            ========   ========               ========   ========    ========               ========

Shares                                           496     10,494                 10,990        496       9,492                  9,988
                                            ========   ========               ========   ========    ========               ========
</TABLE>
<PAGE>

<TABLE>
                                                        PRO FORMA STATEMENTS
                                          INTEGRATED SYSTEMS, INC. AND DOCTOR DESIGN, INC.
                                                            STATEMENT #3
                                        COMBINED RESULTS FOR THE YEAR ENDED FEBRUARY 28, 1995
                                                                
Includes Doctor Design for the year ended December 31, 1994 and                                                               
Integrated Systems, Inc. for the year ended February 28, 1995                                                         
<CAPTION>
                                                                
(in thousands)                                                    Doctor                                Pro Forma          Pro Forma
                                                                  Design                ISI            Adjustments          Combined
                                                                 --------            --------           --------            --------
<S>                                                              <C>                 <C>                <C>                 <C>     
Revenue                                                          $  5,460            $ 51,979                               $ 57,439

Costs and expenses:
     Cost of revenue                                                3,158              11,754                                 14,912
     Selling and marketing                                            233              20,269                                 20,502
     Research and development                                          52               8,294                                  8,346
     General and administrative                                       947               3,601                (98)              4,450
     Amortization                                                                       1,311                                  1,311
                                                                 --------            --------           --------            --------
          Total costs and expenses                                  4,390              45,229                (98)             49,521
                                                                 --------            --------           --------            --------
Income from operations                                              1,070               6,750                 98               7,918

Interest and other income (expense)                                   (24)              1,712                (80)              1,608
                                                                 --------            --------           --------            --------

          Pretax income                                             1,046               8,462                 18               9,526

Income taxes                                                          418               2,708                  3               3,129
                                                                 --------            --------           --------            --------

          Net income                                             $    628            $  5,754           $     15            $  6,397
                                                                 ========            ========           ========            ========

Earnings per share                                               $   1.27            $   0.60                               $   0.63
                                                                 ========            ========                               ========

Shares                                                                496               9,583                                 10,079
                                                                 ========            ========                               ========


</TABLE>
<PAGE>

<TABLE>


                                                        PRO FORMA STATEMENTS
                                          INTEGRATED SYSTEMS, INC. AND DOCTOR DESIGN, INC.
                                                            STATEMENT #4
                                        COMBINED RESULTS FOR THE YEAR ENDED FEBRUARY 28, 1994
                                                                
Includes Doctor Design for the year ended June 30, 1994 and                                                           
Integrated Systems, Inc. for the year ended February 28, 1994                                                         

<CAPTION>
                                                                
(in thousands)                                                    Doctor                               Pro Forma           Pro Forma
                                                                  Design               ISI             Adjustments          Combined
                                                                 --------            --------           --------            --------
<S>                                                              <C>                 <C>               <C>                  <C>     
Revenue                                                          $  4,491            $ 41,701                               $ 46,192

Costs and expenses:
     Cost of revenue                                                2,808              10,409                                 13,217
     Selling and marketing                                            230              16,225                                 16,455
     Research and development                                          56               5,865                                  5,921
     General and administrative                                       704               2,916                (98)              3,522
     Amortization                                                                       1,764                                  1,764
                                                                 --------            --------           --------            --------
          Total costs and expenses                                  3,798              37,179                (98)             40,879
                                                                 --------            --------           --------            --------
Income from operations                                                693               4,522                 98               5,313

Interest and other income (expense)                                   (40)              1,409                (80)              1,289
                                                                 --------            --------           --------            --------

          Pretax income                                               653               5,931                 18               6,602

Income taxes                                                          101               1,898                  3               2,002
                                                                 --------            --------           --------            --------

          Net income                                             $    552            $  4,033           $     15            $  4,600
                                                                 ========            ========           ========            ========

Earnings per share                                               $   1.11            $   0.44                               $   0.47
                                                                 ========            ========                               ========

Shares                                                                496               9,228                                  9,724
                                                                 ========            ========                               ========



</TABLE>
<PAGE>

<TABLE>

                                                        PRO FORMA STATEMENTS
                                          INTEGRATED SYSTEMS, INC. AND DOCTOR DESIGN, INC.
                                                            STATEMENT #5
                                        COMBINED RESULTS FOR THE YEAR ENDED FEBRUARY 28, 1993
                                                                
Includes Doctor Design for the year ended June 30, 1993 and                                                           
Integrated Systems, Inc. for the year ended February 28, 1993                                                         

<CAPTION>
                                                                
(in thousands)                                                    Doctor                               Pro Forma           Pro Forma
                                                                  Design               ISI             Adjustments          Combined
                                                                 --------            --------           --------            --------
<S>                                                              <C>                 <C>               <C>                  <C>     
Revenue                                                          $  2,863            $ 32,388                               $ 35,251

Costs and expenses:
     Cost of revenue                                                2,162               7,391                                  9,553
     Selling and marketing                                            334              11,564                                 11,898
     Research and development                                         108               6,133                                  6,241
     General and administrative                                       672               2,468                (98)              3,042
     Amortization                                                                       1,199                                  1,199
                                                                 --------            --------           --------            --------
          Total costs and expenses                                  3,276              28,755                (98)             31,933
                                                                 --------            --------           --------            --------
Income (loss) from operations                                        (413)              3,633                 98               3,318

Interest and other income                                             218               1,575                (83)              1,710
                                                                 --------            --------           --------            --------
          Pretax income (loss)                                       (195)              5,208                 15               5,028

Income taxes                                                            1               1,771                                  1,772
                                                                 --------            --------           --------            --------
          Net income (loss)                                      ($   196)           $  3,437           $     15            $  3,256
                                                                 ========            ========           ========            ========
Earnings per share                                               ($  0.40)           $   0.37                               $   0.33
                                                                 ========            ========                               ========
Shares                                                                496               9,318                                  9,814
                                                                 ========            ========                               ========

</TABLE>

<PAGE>


          NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS


1.       BASIS OF PRESENTATION

         The Doctor  Design,  Inc.  statements of operations for the years ended
June 30, 1993 and 1994 and December 31, 1994 and the  Integrated  Systems,  Inc.
consolidated  statements  of income for the three years ended  February 28, 1995
have  been  combined.  The  combined  financial  statements  include  pro  forma
adjustments  to include the effect of  ownership  of a building in which  Doctor
Design is located.  This building was owned by a majority  shareholder of Doctor
Design during the periods reported.  Additionally,  the Doctor Design statements
of  operations  for the nine months  ended  September  30, 1995 and 1994 and the
Integrated Systems  consolidated  statements of income for the nine months ended
November 30, 1994 and 1995 have been combined.  This method of combining the two
companies is for the  presentation  of unaudited  pro forma  condensed  combined
financial  statements only. The unaudited pro forma condensed combined financial
statements,  including the notes thereto, should be read in conjunction with the
historical  consolidated  financial  statements of Doctor Design included herein
and those of Integrated Systems.

         No adjustments have been made to conform the accounting policies of the
combining companies. The nature and extent of such adjustments,  if any, will be
based upon further study and analysis and are not expected to be significant.


2.       UNAUDITED PRO FORMA COMBINED NET INCOME PER SHARE

         The unaudited pro forma  combined  statements of operations  for Doctor
Design and  Integrated  Systems have been  prepared as if the  acquisition  were
completed at the beginning of the earliest periods presented.  The unaudited pro
forma  combined net income per share is based on the combined  weighted  average
number of common and common  equivalent shares of Doctor Design common stock and
Integrated  Systems  common  stock for each period,  based upon the  acquisition
exchange ratio.


3.       PRO FORMA UNAUDITED COMBINED SHARES OUTSTANDING

         These  unaudited pro forma combined  financial  statements  reflect the
issuance of approximately  372,000 shares of Integrated  Systems common stock in
exchange for an aggregate of  approximately  2,501,000  shares of Doctor  Design
common  stock in  connection  with  the  acquisition  based  on the  acquisition
exchange ratio of 0.1486 shares of Integrated Systems common stock for every one
share of Doctor Design common stock.

<TABLE>

The following table details the pro forma share issuances in connection with the
acquisition:
<CAPTION>

                                                                  Doctor Design                  Integrated Systems
                                                                  Common Shares      Exchange      Common Shares
                                                                   Outstanding        Ratio          Outstanding
                                                                 ----------------   ------------     -------------
<S>                                                                  <C>                <C>             <C>    
Doctor Design shares outstanding as of November 30, 1995             2,501,000          0.1486          372,000
Integrated Systems shares outstanding as of November 30 1995                                         10,190,000
                                                                                                     ----------
Total number of shares of Integrated Systems common stock
     outstanding after completion of the acquisition                                                 10,562,000
                                                                                                     ----------


</TABLE>


<PAGE>


         In addition,  Integrated Systems assumed all options to purchase Doctor
Design common stock  outstanding  immediately  before the effective  time of the
acquisition.  Each  Doctor  Design  option  is  exercisable  for that  number of
Integrated  Systems'  common stock equal to 0.1486  multiplied  by the number of
shares of Doctor Design purchasable under the Doctor Design option.  Pursuant to
this exchange ratio,  Integrated  Systems may issue up to approximately  132,000
shares of common stock upon exercise of the assumed options.  Assuming  exercise
of all assumed options, Integrated Systems may ultimately issue a total of up to
approximately 504,000 shares of Common Stock.


4.       MERGER RELATED EXPENSES

         Doctor Design and  Integrated  Systems  estimate they will incur direct
transaction  costs of  approximately  $500,000  associated  with the acquisition
consisting of transaction fees for attorneys and accountants. These nonrecurring
transaction  costs will be charged to  operations  primarily  during the quarter
ended February 29, 1996.

         The Unaudited Pro Forma Condensed  Combined  Balance Sheet gives effect
to estimated direct  transaction  costs as if such costs had been incurred as of
November 30, 1995.  These costs are not  reflected  in the  Unaudited  Pro Forma
Condensed Combined Statements of Operations.


<PAGE>
                                INDEX TO EXHIBITS



EXHIBIT
NUMBER                              DESCRIPTION OF EXHIBIT
- -------                             -----------------------
2.01                  Agreement and Plan of Reorganization  dated as of December
                      14, 1995,  as amended as of January 26, 1996, by and among
                      Registrant,  ISI  Purchasing  Corporation  and Dr. Design,
                      Inc. and related documents.

2.02                  Agreement  of Merger  dated as of January  26, 1996 by and
                      between ISI Purchasing Corporation and Dr. Design, Inc.

23.01                 Consent of McGladrey & Pullen, LLP




                                                                    EXHIBIT 2.01

                      AGREEMENT AND PLAN OF REORGANIZATION

         THIS AGREEMENT AND PLAN OF REORGANIZATION  (the "Agreement") is entered
into as of this 14th day of December,  1995,  by and among  Integrated  Systems,
Inc., a California corporation ("ISI"), ISI Purchasing  Corporation,  a Delaware
corporation and a wholly owned subsidiary of ISI ("Newco") and Dr. Design, Inc.,
a California corporation ("DDI").

                                    RECITALS

         A. Newco will  merge with and into DDI in a reverse  triangular  merger
(the  "Merger"),  with DDI to be the surviving  corporation  of the Merger,  all
pursuant to the terms and  conditions  of this  Agreement  and an  Agreement  of
Merger substantially in the form of Exhibit A attached hereto (the "Agreement of
Merger") and the  applicable  provisions of the laws of the States of California
and Delaware.  Upon the effectiveness of the Merger,  all the outstanding Common
Stock of DDI ("DDI Common  Stock")  will be  converted  into Common Stock of ISI
("ISI Common Stock"),  and ISI will assume all  outstanding  options to purchase
shares of the  Common  Stock of DDI (the "DDI  Options"),  as  provided  in this
Agreement and the Agreement of Merger.

         B. The Merger is intended to be treated as a reorganization pursuant to
the provisions of Section  368(a)(1)(A) of the Internal Revenue Code of 1986, as
amended (the "Code"), by virtue of the provisions of Section 368(a)(2)(E) of the
Code.

         NOW, THEREFORE, the parties hereto hereby agree as follows:

1.       PLAN OF REORGANIZATION

         1.1 The Merger. On the Closing Date, Newco will be merged with and into
DDI pursuant to this  Agreement  and the  Agreement of Merger and in  accordance
with applicable  provisions of the laws of the States of California and Delaware
as follows:

                  1.1.1  Conversion  of Shares.  Each share of DDI Common  Stock
issued  and  outstanding  immediately  prior to the filing of the  Agreement  of
Merger  with  the  Secretary  of  State  of the  State  of  California  and  the
Certificate  of Merger with the Secretary of State of the State of Delaware (the
"Effective  Time"),  other than shares, if any, for which dissenters rights have
been or will be perfected in compliance  with  applicable law, will by virtue of
the Merger and at the Effective  Time, and without further action on the part of
any holder  thereof,  be  converted  into the right to receive  the  "Applicable
Fraction" of a share of fully paid and nonassessable shares of ISI Common Stock.
The Applicable Fraction shall be determined by dividing the Total ISI Shares (as
defined  below) by (a) the  number of  outstanding  shares of DDI  Common  Stock
immediately  prior to the Effective Time plus (b) the number of shares of Common
Stock of DDI  purchasable  upon  exercise  of all  outstanding  DDI  Options (as
defined in Section 1.3).  The "Total ISI Shares" shall be determined by dividing
Seventeen Million Five Hundred Thousand Dollars ($17,500,000.00) by the lower of
(a) the  average of the  closing  prices of the ISI  Common  Stock on the Nasdaq
Stock  Market on the ten (10)  business  days  ending  two (2) days prior to the
Closing Date,  (b) the average of the closing  prices of the ISI Common Stock on
the Nasdaq  Stock  Market on the sixty (60)  business  days  ending two (2) days
prior to the Closing Date and (c) Thirty  Seven  Dollars and  Thirty-Five  Cents
($37.35);  with such lower  price being  referred to herein as the "ISI  Average
Price".  In the  event  the  price of ISI  Common  Stock,  as  determined  under
subsection  (a), (b) or (c) above,  is less than twenty seven  dollars and fifty
cents  ($27.50),  the price  used to  calculate  the Total ISI  Shares  shall be
$27.50;  provided,  however,  that in such case, DDI may, in its sole discretion
and without  penalty of any kind  whatsoever,  elect to terminate this Agreement
and the DDI Ancillary Agreements (as defined in Section 2.2.1 hereof).


<PAGE>


                  1.1.2 Adjustments for Capital Changes. If prior to the Merger,
ISI or DDI  recapitalizes  through a split-up of its  outstanding  shares into a
greater number, or a combination of its outstanding shares into a lesser number,
reorganizes,  reclassifies or otherwise changes its outstanding  shares into the
same or a different  number of shares of other  classes  (other  than  through a
split-up or  combination  of shares  provided  for in the previous  clause),  or
declares a dividend on its  outstanding  shares  payable in shares or securities
convertible into shares, the number of shares of ISI Common Stock into which the
shares of DDI Common Stock are to be converted will be adjusted appropriately so
as to  maintain  the  proportionate  interests  of the holders of the DDI Common
Stock and the holders of ISI shares.

                  1.1.3 Dissenting Shares. Holders of shares of DDI Common Stock
who have complied with all requirements for perfecting  dissenter's  rights,  as
set forth in the General Corporation Law of the State of California ("California
Law"),  shall be entitled to their rights under the  California Law with respect
to such shares ("Dissenting Shares").

         1.2 Fractional Shares. No fractional shares of ISI Common Stock will be
issued in  connection  with the Merger,  but in lieu  thereof each holder of DDI
Common Stock who would otherwise be entitled to receive a fraction of a share of
ISI Common Stock will receive from ISI, at the Effective Time, an amount of cash
equal to the ISI  Average  Price  multiplied  by the  fraction of a share of ISI
Common Stock to which such holder would otherwise be entitled.

         1.3 DDI Options. At the Effective Time, ISI will assume all DDI Options
and each holder of a DDI Option  granted  under DDI's 1991 Stock Option Plan, as
amended (the "DDI Plan"),  shall be entitled,  in  accordance  with the existing
terms of such DDI Option,  to purchase  after the Effective  Time that number of
shares of ISI Common Stock,  determined by  multiplying  the number of shares of
Common  Stock of DDI  subject  to such DDI Option at the  Effective  Time by the
Applicable  Fraction,  and the exercise price per share for each such DDI Option
will  equal  the  exercise  price  of the DDI  Option  immediately  prior to the
Effective Time divided by the Applicable Fraction.  If the foregoing calculation
results in an assumed option being  exercisable for a fraction of a share,  then
the number of shares of ISI Common Stock  subject to such option will be rounded
down to the nearest whole number with no cash being payable for such  fractional
share. The term, exercisability, vesting schedule, status as an "incentive stock
option" under Section 422A of the Code,  if  applicable,  and all other terms of
the DDI Options will otherwise be unchanged.  The continuous  term of employment
with  DDI  will  be  credited  to  each  holder  of a DDI  Option  as if it were
employment  with ISI for purposes of  determining  the vesting and the number of
shares subject to exercise after the Effective Time.

                  1.4  Escrow  Agreement.  At the  closing  of the  Merger  (the
"Closing"),  ISI will  withhold  ten  percent  (10%) of the shares of ISI Common
Stock to be  issued  to the  shareholders  of DDI (the  "DDI  Shareholders")  in
accordance  with Section 1.1 (rounded down to the nearest whole number of shares
to be  issued  to each DDI  Shareholder)  and ten  percent  (10%) of the  shares
issuable  upon  exercise of DDI Options  assumed by ISI during the Escrow Period
(as such term is defined below) and deliver such shares (the "Escrow Shares") to
the Chemical Trust Company of California (the "Escrow Agent"),  as escrow agent,
to be held by Escrow Agent as collateral for DDI's  indemnification  obligations
under Section 10.2 and pursuant to the  provisions of an escrow  agreement  (the
"Escrow  Agreement") in substantially the form of Exhibit 1.4. The Escrow Shares
will be represented by a certificate or  certificates  issued in the name of the
Escrow Agent and will be held by the Escrow Agent from the Closing until (a) the
date on which ISI has received  audited  financial  statements  together  with a
report thereon from ISI's independent  auditors covering the combined results of
ISI and DDI for the first fiscal year of ISI ending after the Closing Date,  for
items expected to be encountered in the audit process (but such period to end no
later than one (1) year from the Closing  Date),  provided that ISI shall have a
reasonable  period of time,  not to exceed ninety (90) days, to review the audit
results to  determine  if any claim for Damages  exists  under  Section 10.2 (as
defined in Section 10.2) and ISI shall  provide  notice of any claim for Damages
with the ninety  (90) day period and (b) twelve  (12)  months  after the Closing
Date for all other items (the "Escrow Period").  Provided however,  in all cases
as to matters which an  Indemnified  Person has given written  notice of a claim
for Damages (as defined in Section 10.2 below) during the applicable  period set
forth in (a) or (b), the Escrow Period with respect thereto shall continue until
such claim for Damages is finally resolved and DDI's indemnification obligations
under Section 10.2 hereof with respect thereto are fully satisfied. In the event
that the Merger is approved by the DDI Shareholders, as provided herein, the DDI
Shareholders shall, without any further


                                      -2-

<PAGE>

act of any DDI Shareholder,  be deemed to have consented to and approved (i) the
use of the Escrow Shares as  collateral  for DDI's  indemnification  obligations
under  Section  10.2 in the manner set forth in the Escrow  Agreement,  (ii) the
appointment of Marco J. Thompson as the  representative  of the DDI Shareholders
(the  "Representative")  under the Escrow Agreement and as the  attorney-in-fact
and agent  for and on behalf of each DDI  Shareholder  (other  than  holders  of
Dissenting Shares),  and the taking by the Representative of any and all actions
and the making of any  decisions  required or permitted to be taken by him under
the Escrow Agreement (including,  without limitation,  the exercise of the power
to: authorize delivery to ISI of Escrow Shares in satisfaction of claims by ISI;
agree to,  negotiate,  enter  into  settlements  and  compromises  of and demand
arbitration  and comply  with  orders of courts and awards of  arbitrators  with
respect to such claims;  resolve any claim made  pursuant to Section  10.2;  and
take  all  actions  necessary  in the  judgment  of the  Representative  for the
accomplishment of the foregoing) and (iii) to all of the other terms, conditions
and limitations in the Escrow Agreement.

         1.5 Effects of the Merger.  At the  Effective  Time:  (a) the  separate
existence  of Newco will cease and Newco will be merged  with and into DDI,  and
DDI will be the surviving corporation, pursuant to the terms of the Agreement of
Merger,  (b) the  Articles  of  Incorporation  and  Bylaws of DDI will  continue
unchanged  as  the  Articles  of  Incorporation  and  Bylaws  of  the  surviving
corporation,  (c) each share of Newco Common Stock outstanding immediately prior
to the Effective Time will continue to be an identical  outstanding share of the
surviving  corporation,  (d) the Board of  Directors  and  officers  of ISI will
remain  unchanged,  all the directors of DDI immediately  prior to the Effective
Time  except for Marco  Thompson  will  resign and ISI will  appoint two (2) new
directors of the surviving corporation and the officers of DDI immediately prior
to the Effective Time will become the officers of the surviving corporation, (e)
each share of Common Stock of DDI outstanding immediately prior to the Effective
Time will be converted and each DDI Option outstanding  immediately prior to the
Effective  Time will be assumed by ISI as provided in Sections 1.1, 1.2 and 1.3;
and (f) the Merger  will,  from and after the  Effective  Time,  have all of the
effects provided by applicable law.

         1.6 Further Assurances. DDI agrees that if, at any time before or after
the  Effective  Time,  ISI  considers  or is  advised  that any  further  deeds,
assignments or assurances are reasonably necessary or desirable to vest, perfect
or confirm  in ISI title to any  property  or rights of DDI,  ISI and its proper
officers  and   directors  may  execute  and  deliver  all  such  proper  deeds,
assignments  and  assurances  and do all other things  necessary or desirable to
vest,  perfect or confirm  title to such property or rights in ISI and otherwise
to carry out the purpose of this Agreement, in the name of DDI or otherwise.

         1.7  Reorganization.  The parties  intend to adopt this  Agreement as a
plan of  reorganization  and to  consummate  the Merger in  accordance  with the
provisions of Section  368(a)(1)(A)  of the Code.  The parties  believe that the
total  value  of the ISI  Common  Stock  to be  received  in the  Merger  by the
shareholders  of DDI is equal,  in each instance,  to the total value of the DDI
Common Stock to be surrendered in exchange therefor.  The ISI Stock, and options
to purchase  ISI Stock,  issued in the Merger will be issued  solely in exchange
for DDI Common Stock and DDI  Options,  respectively,  and no other  transaction
other  than  the  Merger  represents,  provides  for  or  is  intended  to be an
adjustment to the  consideration  paid for the DDI Common Stock and DDI Options.
Except for cash paid in lieu of fractional  shares or for Dissenting  Shares, no
consideration  that could  constitute  "other  property"  within the  meaning of
Section  356 of the Code is being  paid by ISI for the DDI  Common  Stock in the
Merger.  The parties  shall not take a position on any tax returns  inconsistent
with this Section 1.7. In addition,  ISI  represents  now, and as of the Closing
Date,  that it presently  intends to continue DDI's  historic  business or use a
significant  portion of DDI's  business  assets in a business.  At the  Closing,
officers of each of ISI and DDI shall execute and deliver officers' certificates
in the forms of  Exhibits  1.7A-B,  together  with an  acknowledgment  that such
certificates  will be relied  upon by  counsel to DDI and  counsel  to ISI.  The
provisions  and  representations  contained  or referred to in this  Section 1.7
shall survive until the expiration of the applicable statute of limitations.

         1.8 Pooling of Interests. The parties intend that the Merger be treated
as a "pooling of interests" for accounting purposes.

                                      -3-
<PAGE>



         1.9  Publication  of  Financials.  ISI shall cause  publication  of the
combined  results of DDI and ISI within thirty (30) days after ISI's fiscal year
end if the Closing  occurs no later than January 26, 1996,  otherwise  ISI shall
cause  publication  of the combined  results  within fifteen (15) days after the
close of a period of at least thirty (30) days of combined operations of DDI and
ISI. For purposes of this  Section  1.9, the term  "publication"  shall have the
meaning provided in SEC Accounting Series Release No. 135.

2.       REPRESENTATIONS AND WARRANTIES OF DDI

         DDI hereby  represents  and  warrants as follows,  that,  except as set
forth on the DDI  Schedule of  Exceptions  delivered  to ISI herewith as Exhibit
2.0:

         2.1  Organization  and  Good  Standing.   DDI  is  a  corporation  duly
organized,  validly existing and in good standing under the laws of the state of
California,  has the corporate power and authority to own, operate and lease its
properties  and to carry on its business as now  conducted and as proposed to be
conducted,  and is qualified as a foreign  corporation in each  jurisdiction  in
which a failure  to be so  qualified  could  reasonably  be  expected  to have a
material adverse effect on its present operations or financial condition.

         2.2      Power, Authorization and Validity.

                  2.2.1 DDI has the right,  power,  legal capacity and authority
to enter  into  and  perform  its  obligations  under  this  Agreement,  and all
agreements  to which DDI is or will be a party that are  required to be executed
pursuant to this  Agreement  (the "DDI  Ancillary  Agreements").  The execution,
delivery and performance of this Agreement and the DDI Ancillary Agreements have
been duly and validly approved and authorized by DDI's Board of Directors.

                  2.2.2 No filing,  authorization  or approval,  governmental or
otherwise,  is  necessary  to  enable  DDI to enter  into,  and to  perform  its
obligations under, this Agreement and the DDI Ancillary  Agreements,  except for
(a) the filing of the  Agreement  of Merger  with the  California  Secretary  of
State, and the filing of appropriate  documents with the relevant authorities of
other states in which DDI is qualified to do business, if any, (b) the filing of
the Certificate of Merger with the Delaware Secretary of State, (c) such filings
as may be required to comply with federal and state securities laws, and (d) the
approval of the DDI Shareholders of the transactions contemplated hereby.

                  2.2.3 This Agreement and the DDI Ancillary  Agreements are, or
when executed by DDI will be, valid and binding  obligations of DDI  enforceable
in accordance with their respective  terms,  except as to the effect, if any, of
(a)  applicable  bankruptcy  and other  similar  laws  affecting  the  rights of
creditors generally, (b) rules of law governing specific performance, injunctive
relief and other  equitable  remedies and (c) the  enforceability  of provisions
requiring  indemnification in connection with the offering,  issuance or sale of
securities;  provided,  however,  that  the  Agreement  of  Merger  will  not be
effective until filed with the California Secretary of State and the Certificate
of Merger will not be  effective  until  filed with the  Delaware  Secretary  of
State.

                                      -4-
<PAGE>


         2.3  Capitalization.  The  authorized  capital stock of DDI consists of
5,000,000  shares of Class A Common Stock (no par value) and 1,000,000 shares of
Class B Common Stock (no par value), of which 2,555,720 shares of Class A Common
Stock and no  shares of Class B Common  Stock are  issued  and  outstanding.  An
aggregate  of 1,500,000  shares of DDI Common Stock are reserved and  authorized
for issuance  pursuant to the DDI Plan,  of which options to purchase a total of
887,443 shares of DDI Common Stock are  outstanding.  All issued and outstanding
shares of DDI Common Stock have been duly  authorized  and validly  issued,  are
fully paid and non assessable,  are not subject to any right of rescission,  and
have been offered,  issued,  sold and  delivered by DDI in  compliance  with all
registration or qualification  requirements (or applicable exemptions therefrom)
of applicable  federal and state  securities  laws. A list of all holders of DDI
Common Stock and DDI Options,  and the number of shares and options held by each
has been  delivered by DDI to ISI herewith as Schedule 2.3.  Except as set forth
in this  Section and in Schedule  2.3,  there are no options,  warrants,  calls,
commitments,  conversion  privileges or preemptive or other rights or agreements
outstanding to purchase any of DDI's  authorized  but unissued  capital stock or
any securities  convertible  into or exchangeable for shares of DDI Common Stock
or  obligating  DDI to grant,  extend,  or enter into any such option,  warrant,
call, right,  commitment,  conversion privilege or other right or agreement, and
there is no  liability  for  dividends  accrued but unpaid.  There are no voting
agreements,  rights of first  refusal or other  restrictions  (other than normal
restrictions on transfer under  applicable  federal and state  securities  laws)
applicable  to any of  DDI's  outstanding  securities.  DDI  is  not  under  any
obligation  to  register  under the United  States  Securities  Act of 1933,  as
amended (the "Securities Act") any securities that may be subsequently issued.

         2.4  Subsidiaries.  DDI does not have any subsidiaries or any interest,
direct or indirect,  in any  corporation,  partnership,  joint  venture or other
business entity.

         2.5 No  Violation of Existing  Agreements.  Neither the  execution  and
delivery of this Agreement nor any DDI Ancillary Agreement, nor the consummation
of the transactions contemplated hereby, will conflict with, or (with or without
notice or lapse of time, or both) result in a termination, breach, impairment or
violation of (a) any provision of the Certificate of  Incorporation or Bylaws of
DDI or any Subsidiary,  as currently in effect, (b) in any material respect, any
material  instrument or contract to which DDI or any Subsidiary is a party or by
which  DDI or any  Subsidiary  is bound,  or (c) any  federal,  state,  local or
foreign judgment, writ, decree, order, statute, rule or regulation applicable to
DDI or any Subsidiary or their respective assets or properties. The consummation
of the  Merger  and  the  transfer  to ISI of  all  material  rights,  licenses,
franchises,  leases and agreements of DDI and each  Subsidiary  will not require
the consent of any third party.

         2.6 Litigation.  There is no action, proceeding, claim or investigation
pending against DDI or any Subsidiary before any court or administrative  agency
that if determined adversely to DDI or any Subsidiary may reasonably be expected
to have a  material  adverse  effect  on the  present  or future  operations  or
financial  condition  of DDI or any  Subsidiary,  nor,  to  the  best  of  DDI's
knowledge,  has  any  such  action,  proceeding,  claim  or  investigation  been
threatened.  There is, to the best of DDI's  knowledge,  no reasonable basis for
any  shareholder  or  former  shareholder  of DDI,  or any other  person,  firm,
corporation,  or entity,  to assert a claim  against DDI or ISI based upon:  (a)
ownership or rights to  ownership of any shares of DDI Common Stock  (except for
dissenter's rights with respect to shares of ISI Common Stock issuable by virtue
of the Merger),  (b) any rights as a DDI  Shareholder,  including  any option or
preemptive  rights or rights to notice or to vote,  or (c) any rights  under any
agreement among DDI and its Shareholders.

                                      -5-
<PAGE>



         2.7  Taxes.  DDI and each of its  Subsidiaries  has filed all  material
federal, state, local and foreign tax returns required to be filed, has paid all
taxes  shown due on all  returns  which  have been  filed,  has  established  an
adequate  accrual or reserve  for the  payment  of all taxes,  due and  payable,
including  reasonable  accruals  for taxes,  payable  in respect of the  periods
subsequent to the periods covered by the most recent applicable tax returns, has
made all necessary  estimated tax  payments,  and has no material  liability for
taxes in excess of the amount so paid or accruals or reserves so established. No
deficiencies for any tax have been threatened, claimed, proposed, or assessed by
any  taxing  authority.  No tax  return of DDI or any  Subsidiary  has ever been
audited by the Internal Revenue Service or any state taxing agency or authority.
For the  purposes of this  Agreement,  the terms  "tax" and "taxes"  include all
federal,  state, local and foreign income, gains, franchise,  excise,  property,
sales, use, employment, license, payroll, occupation,  recording, value added or
transfer  taxes,  governmental  charges,  fees,  levies or assessments  (whether
payable  directly or by  withholding),  and,  with  respect to such  taxes,  any
estimated  tax,  interest and penalties or additions to tax and interest on such
penalties and additions to tax.

         2.8 DDI Financial Statements.  DDI has delivered to ISI as Schedule 2.8
DDI's audited balance sheet as of June 30, 1995 (the "Balance Sheet") and income
statement and statement of cash flows for the year then ended (collectively, the
"Audited Financial  Statements") and the unaudited balance sheet as of September
30,  1995  (the  September   Balance  Sheet)  and  unaudited  interim  financial
statements for the period ended September 30, 1995 (collectively, the "Unaudited
Financial  Statements")(The  Audited  Financial  Statements  and  the  Unaudited
Financial  Statements  are  collectively  referred  to herein as the  "Financial
Statements'"). The Financial Statements (a) are in accordance with the books and
records of DDI, (b) fairly  present the  financial  condition of DDI at the date
therein  indicated  and  the  results  of  operations  for  the  period  therein
specified, (c) the Audited Financial Statements have been prepared in accordance
with generally accepted accounting principles applied on a consistent basis, and
(d) the Unaudited Financial  Statements will be subject to normal year-end audit
adjustments and will not contain footnotes.  DDI has no material debt, liability
or obligation of any nature, whether accrued, absolute, contingent or otherwise,
and whether due or to become due, that is not  reflected or reserved  against in
the  Financial  Statements  which would be  required  under  generally  accepted
accounting  principles  to be reflected  or reserved,  except for those that may
have been incurred  after the date of the  Financial  Statements in the ordinary
course of its business,  consistent with past practice and that are not material
in amount either individually or collectively.

         2.9 Title to Properties.  DDI has good and  marketable  title to all of
its assets as shown on the Balance Sheet, free and clear of all liens,  charges,
restrictions or encumbrances (other than for taxes not yet due and payable). All
machinery and  equipment  included in such  properties is in good  condition and
repair,  normal  wear and tear  excepted,  and all  leases  of real or  personal
property  to which DDI or any  Subsidiary  is a party are  fully  effective  and
afford DDI or the Subsidiary peaceful and undisturbed  possession of the subject
matter of the lease.  Neither  DDI nor any  Subsidiary  is in  violation  of any
zoning, building,  safety or environmental ordinance,  regulation or requirement
or other  law or  regulation  applicable  to the  operation  of owned or  leased
properties  (the violation of which would have a material  adverse effect on its
business),  or has  received  any  notice  of  violation  with  which it has not
complied.

         2.10  Absence  of  Certain  Changes.  Since  the date of the  September
Balance Sheet, there has not been with respect to DDI or any Subsidiary:

                  (a) any change in the financial condition, properties, assets,
liabilities,  business  or  operations  thereof  which  change  by  itself or in
conjunction with all other such changes,  whether or not arising in the ordinary
course of business, has had or will have a material adverse effect thereon;

                  (b) any  material  contingent  liability  incurred  thereby as
guarantor or otherwise with respect to the obligations of others;

                                      -6-
<PAGE>

                  (c) any material  mortgage,  encumbrance or lien placed on any
of the properties thereof;

                  (d) any  material  obligation  or liability  incurred  thereby
other than  obligations  and  liabilities  incurred  in the  ordinary  course of
business;

                  (e) any material purchase or sale or other disposition, or any
agreement or other arrangement for the purchase,  sale or other disposition,  of
any of the  properties or assets  thereof  other than in the ordinary  course of
business;

                  (f) any damage, destruction or loss, whether or not covered by
insurance, materially and adversely affecting the properties, assets or business
thereof;

                  (g) any declaration,  setting aside or payment of any dividend
on, or the making of any other  distribution  in respect of, the  capital  stock
thereof, any split, combination or recapitalization of the capital stock thereof
or any direct or  indirect  redemption,  purchase  or other  acquisition  of the
capital stock thereof;

                  (h) any labor dispute or claim of unfair labor practices,  any
change in the compensation  payable or to become payable to any of its officers,
employees or agents,  or any bonus payment or arrangement made to or with any of
such officers, employees or agents;

                  (i) any change with respect to the management,  supervisory or
other key personnel thereof;

                  (j) any payment or discharge  of a material  lien or liability
thereof  which  lien was not  either  shown on the  September  Balance  Sheet or
incurred in the ordinary course of business thereafter; or

                  (k) any obligation or liability incurred thereby to any of its
officers, directors or shareholders or any loans or advances made thereby to any
of its  officers,  directors or  shareholders  except  normal  compensation  and
expense allowances payable to officers.

         2.11  Contracts and  Commitments.  Except as set forth on Schedule 2.11
delivered to ISI  herewith,  neither DDI nor any  Subsidiary  has any  contract,
obligation  or  commitment  which  is  material  to the  business  of DDI or any
Subsidiary  or which  involves a potential  commitment in excess of Seventy Five
Thousand  Dollars  ($75,000)  or any stock  redemption  or  purchase  agreement,
financing agreement,  license,  lease or franchise.  A copy of each agreement or
document  listed on Schedule 2.11 has been delivered to ISI's  counsel.  Neither
DDI nor any Subsidiary is in default in any material respect under any contract,
obligation or commitment  listed on Schedule 2.11 or that is otherwise  material
to the  business of DDI or a  Subsidiary.  Neither DDI nor any  Subsidiary  is a
party to any  contract  or  arrangement  which  has had or could  reasonably  be
expected to have a material adverse effect on its business or prospects. Neither
DDI  nor  any  Subsidiary  has  any  material  liability  for  renegotiation  of
government contracts or subcontracts, if any.

                                      -7-

<PAGE>


         2.12 Intellectual Property. To the best of DDI's knowledge, DDI and the
DDI  Subsidiaries  own, or have the right to use,  sell or license all  material
Intellectual  Property  Rights (as defined below)  necessary or required for the
conduct of their respective businesses as presently conducted (such Intellectual
Property  Rights  being  hereinafter  collectively  referred  to as the  "DDI IP
Rights") and such rights to use, sell or license are  reasonably  sufficient for
such  conduct  of their  respective  businesses.  The  execution,  delivery  and
performance  of  this  Agreement  and  the   consummation  of  the  transactions
contemplated  hereby  will not  constitute  a  material  breach of any  material
instrument  or  agreement  governing  any  DDI IP  Right  (the  "DDI  IP  Rights
Agreements"),  will not cause the  forfeiture or  termination  or give rise to a
right of forfeiture or termination of any DDI IP Right or materially  impair the
right of DDI or any  Subsidiaries  to use,  sell or license  any DDI IP Right or
portion thereof (except where such breach,  forfeiture or termination  would not
have a  material  adverse  effect  on DDI and the DDI  Subsidiaries,  taken as a
whole). There are no royalties, honoraria, fees or other payments payable by DDI
to any person by reason of the ownership,  use, license,  sale or disposition of
the DDI IP  Rights  (other  than as set  forth in the DDI IP  Rights  Agreements
listed in Schedule 2.12). Neither the manufacture,  marketing,  license, sale or
intended use of any product currently  licensed or sold by DDI or any of the DDI
Subsidiaries  or  currently  under   development  by  DDI  or  any  of  the  DDI
Subsidiaries  violates  any license or  agreement  between DDI or any of the DDI
Subsidiaries and any third party or infringes any Intellectual Property Right of
any other  party;  and there is no  pending  or, to the best  knowledge  of DDI,
threatened  claim or litigation  contesting the validity,  ownership or right to
use, sell,  license or dispose of any DDI IP Right nor, to the best knowledge of
DDI without any independent  investigation  thereof,  is there any basis for any
such claim,  nor has DDI received any notice  asserting that any DDI IP Right or
the  proposed  use,  sale,  license or  disposition  thereof  conflicts  or will
conflict with the rights of any other party,  nor, to the best knowledge of DDI,
is there  any  basis  for any  such  assertion.  DDI has  taken  reasonable  and
practicable   steps   designed  to  safeguard   and  maintain  the  secrecy  and
confidentiality  of, and its proprietary  rights in, all material DDI IP Rights.
All officers, employees and consultants of DDI and each Subsidiary have executed
and delivered to DDI or the Subsidiary an agreement  regarding the protection of
proprietary  information  and the  assignment  to DDI or the  Subsidiary  of all
Intellectual  Property Rights arising from the services performed for DDI or the
Subsidiary by such persons.  Schedule 2.12 contains a list of all  applications,
registrations,  filings  and other  formal  actions  made or taken  pursuant  to
federal, state and foreign laws by DDI to perfect or protect its interest in DDI
IP Rights,  including,  without limitation,  all patents,  patent  applications,
trademarks,  trademark  applications and service marks. As used herein, the term
"INTELLECTUAL   PROPERTY  RIGHTS"  shall  mean  all  worldwide   industrial  and
intellectual property rights,  including,  without limitation,  patents,  patent
applications,  patent rights, trademarks,  trademark applications,  trade names,
service marks,  service mark applications,  copyright,  copyright  applications,
franchises,  licenses,  inventories,  know-how,  trade secrets,  customer lists,
proprietary  processes  and  formulae,  all source and object code,  algorithms,
architecture, structure, display screens, layouts, inventions, development tools
and all  documentation  and media  constituting,  describing  or relating to the
above, including, without limitation, manuals, memoranda and records.

         2.13  Compliance  with  Laws.  DDI  and  each of its  Subsidiaries  has
complied, or prior to the Closing Date will have complied,  and is or will be at
the  Closing  Date  in  full  compliance,  in all  material  respects  with  all
applicable laws,  ordinances,  regulations,  and rules,  and all orders,  writs,
injunctions,  awards,  judgments, and decrees applicable to it or to the assets,
properties,  and business  thereof (the violation of which would have a material
adverse  effect  upon its  business),  including,  without  limitation:  (a) all
applicable federal and state securities laws and regulations, (b) all applicable
federal, state, and local laws, ordinances,  regulations, and all orders, writs,
injunctions,  awards,  judgments,  and  decrees  pertaining  to  (i)  the  sale,
licensing,  leasing,  ownership,  or management of its owned, leased or licensed
real or personal  property,  products and technical  data,  (ii)  employment and
employment  practices,  terms and conditions of employment,  and wages and hours
and (iii) safety, health, fire prevention, environmental protection, toxic waste
disposal,  building  standards,  zoning and other similar matters (c) the Export
Administration  Act and regulations  promulgated  thereunder and all other laws,
regulations, rules, orders, writs, injunctions, judgments and decrees applicable
to the export or re-export of controlled  commodities  or technical data and (d)
the  Immigration  Reform and Control Act. Each of DDI and the  Subsidiaries  has
received all permits and approvals  from,  and has made all filings with,  third
parties,  including  government agencies and authorities,

                                      -8-
<PAGE>


that are necessary in connection with its present business. To the best of DDI's
knowledge,  there are no legal or  administrative  proceedings or investigations
pending or  threatened,  that, if enacted or determined  adversely to DDI or any
Subsidiary, would result in any material adverse change in the present or future
operations or financial condition thereof.

         2.14 Certain  Transactions  and Agreements.  Neither Marco Thompson nor
any  member  of his  immediate  family,  has any  direct or  indirect  ownership
interest in any firm or corporation  that competes with DDI (except with respect
to any interest in less than one percent of the stock of any  corporation  whose
stock  is  publicly  traded).  Neither  Marco  Thompson  nor any  member  of his
immediate  family is  directly  or  indirectly  interested  in any  contract  or
informal arrangement with DDI or any Subsidiary,  except for normal compensation
for services as an officer, director or employee thereof. Neither Marco Thompson
nor any member of his immediate family has any interest in any property, real or
personal,  tangible or intangible,  including inventions,  patents,  copyrights,
trademarks  or trade  names  or  trade  secrets,  used in or  pertaining  to the
business  of  DDI  or  any  Subsidiary,  except  for  the  normal  rights  of  a
shareholder.

         2.15.    Employees, ERISA and Other Compliance.

                  2.15.1 Except as set forth in Schedule 2.15.1, neither DDI nor
any Subsidiary has any employment  contracts or consulting  agreements currently
in effect that are not terminable at will (other than  agreements  with the sole
purpose of providing  for the  confidentiality  of  proprietary  information  or
assignment of  inventions).  All officers,  employees and consultants of DDI and
the  Subsidiaries  having access to  proprietary  information  have executed and
delivered to DDI or the Subsidiary an agreement regarding the protection of such
proprietary  information  and  the  assignment  of  inventions  to  DDI  or  the
Subsidiary;  copies of the form of all such  agreements  have been  delivered to
ISI's counsel.

                  2.15.2  Neither DDI nor any Subsidiary (i) has ever been or is
now  subject to a union  organizing  effort,  (ii) is subject to any  collective
bargaining  agreement with respect to any of its employees,  (iii) is subject to
any other contract,  written or oral, with any trade or labor union,  employees'
association or similar organization, or (iv) has any current labor disputes. DDI
and each of its Subsidiaries  has good labor relations,  and has no knowledge of
any facts  indicating  that the  consummation of the  transactions  contemplated
hereby will have a material adverse effect on such labor  relations,  and has no
knowledge that any of its key employees intends to leave its employ.

                  2.15.3  Schedule  2.15.3  identifies  each  "employee  benefit
plan," as defined in Section 3(3) of the Employee Retirement Income Security Act
of 1974, as amended ("ERISA") but excluding workers' compensation,  unemployment
compensation  and other  government-mandated  programs)  currently or previously
maintained,  contributed to or entered into by DDI or any Subsidiary under which
DDI or any Subsidiary or any ERISA  Affiliate (as defined below) thereof has any
present or future  obligation  or  liability  (collectively,  the "DDI  Employee
Plans").  For purposes of this Section 2.15.3,  "ERISA Affiliate" shall mean any
entity which is a member of (A) a "controlled group of corporations," as defined
in Section 414(b) of the Code,  (B) a group of entities under "common  control,"
as defined in Section 414(c) of the Code, or (C) an "affiliated  service group,"
as defined in Section  414(m) of the Code, or treasury  regulations  promulgated
under Section 414(o) of the Code,  any of which includes DDI or any  Subsidiary.
Copies of all DDI Employee Plans (and, if applicable,  related trust agreements)
and all  amendments  thereto and summary plan  descriptions  thereof  (including
summary plan descriptions)  have been delivered to ISI or its counsel,  together
with the three most recent annual reports (Form 5500, including,  if applicable,
Schedule B thereto)  prepared in connection with any such DDI Employee Plan. All
DDI Employee  Plans which  individually  or  collectively  would  constitute  an
"employee   pension   benefit  plan,"  as  defined  in  Section  3(2)  of  ERISA
(collectively,  the "DDI Pension  Plans"),  are  identified  as such in Schedule
2.15.3.  As of June 30, 1995, all  contributions  due from DDI or any Subsidiary
with respect to any of the DDI Employee  Plans have been made as required  under
ERISA or have  been  accrued  on DDI's  or any such DDI  Subsidiary's  financial
statements.  Each  DDI  Employee  Plan  has  been  maintained  substantially  in
compliance  with its terms and with the  requirements  prescribed by any and all
statutes, orders, rules and regulations,  including,  without limitation,  ERISA
and the Code, which are applicable to such DDI Employee Plans.

                                      -9-

<PAGE>


                  2.15.4  No DDI  Pension  Plan  constitutes,  or has  since the
enactment of ERISA  constituted,  a "multiemployer  plan," as defined in Section
3(37) of ERISA.  No DDI  Pension  Plans  are  subject  to Title IV of ERISA.  No
"prohibited  transaction," as defined in Section 406 of ERISA or Section 4975 of
the Code, has occurred with respect to any DDI Employee Plan which is covered by
Title I of ERISA  which  would  result in a  material  liability  to DDI and its
Subsidiaries  taken as a whole,  excluding  transactions  effected pursuant to a
statutory or administrative exemption. Nothing done or omitted to be done and no
transaction or holding of any asset under or in connection with any DDI Employee
Plan has or will make DDI or any  officer  or  director  of DDI  subject  to any
material  liability  under Title I of ERISA or liable for any  material  tax (as
defined in Section 2.7) or penalty pursuant to Sections 4972, 4975, 4976 or 4979
of the Code or Section 502 of ERISA.

                  2.15.5 Any DDI Pension  Plan which is intended to be qualified
under Section  401(a) of the Code (a "DDI 401(a) Plan") has received a favorable
determination  from the Internal Revenue Service as to its  qualifications,  and
DDI is not aware of any reason why such  determination may not be relied upon by
such plan.

                  2.15.6  Schedule  2.15.6 lists each  employment,  severance or
other  similar  contract,  arrangement  or policy  and each plan or  arrangement
(written or oral) providing for insurance  coverage  (including any self-insured
arrangements),   workers'  benefits,  vacation  benefits,   severance  benefits,
disability  benefits,  death  benefits,   hospitalization  benefits,  retirement
benefits, deferred compensation,  profit-sharing,  bonuses, stock options, stock
purchase,  phantom  stock,  stock  appreciation  or  other  forms  of  incentive
compensation  or  post-retirement   insurance,   compensation  or  benefits  for
employees, consultants or directors which (A) is not a DDI Employee Plan, (B) is
entered into,  maintained or  contributed  to, as the case may be, by DDI or any
Subsidiary  and  (C)  covers  any  employee  or  former  employee  of DDI or any
Subsidiary.  Such  contracts,  plans and  arrangements  as are described in this
Section  2.15.6  are  herein  referred  to  collectively  as  the  "DDI  Benefit
Arrangements."  Each DDI Benefit  Arrangement has been maintained in substantial
compliance  with its terms and with the  requirements  prescribed by any and all
statutes, orders, rules and regulations which are applicable to such DDI Benefit
Arrangement. DDI has delivered to ISI or its counsel a complete and correct copy
or description of each DDI Benefit Arrangement.

                  2.15.7 There has been no amendment to, written  interpretation
or announcement  (whether or not written) by DDI or any Subsidiary  relating to,
or change in employee  participation or coverage under, any DDI Employee Plan or
DDI  Benefit   Arrangement  that  would  increase   materially  the  expense  of
maintaining such DDI Employee Plan or DDI Benefit Arrangement above the level of
the expense incurred in respect thereof for the fiscal year ended June 30, 1995.

                  2.15.8 DDI has provided to  individuals  entitled  thereto all
required  notices and  coverage  pursuant  to Section  4980B of the Code and the
Consolidated  Omnibus Budget  Reconciliation  Act of 1985, as amended ("COBRA"),
with respect to any "qualifying event" (as defined in Section 4980B(f)(3) of the
Code) under any DDI Employee Plan  occurring  prior to and including the Closing
Date,  and no material  Tax payable on account of Section  4980B of the Code has
been  incurred  with  respect  to any  current  or  former  employees  (or their
beneficiaries) of DDI or any Subsidiary.

                  2.15.9 No benefit  payable or which may become  payable by DDI
or any  Subsidiary  pursuant  to any  DDI  Employee  Plan  or  any  DDI  Benefit
Arrangement or as a result of or arising under this Agreement  shall  constitute
an "excess  parachute  payment" (as defined in Section  280G(b)(1)  of the Code)
which is subject to the  imposition  of an excise Tax under  Section 4999 of the
Code or which would not be deductible by reason of Section 280G of the Code.

                  2.15.10 DDI and each DDI  Subsidiary  is in  compliance in all
material respects with all applicable laws, agreements and contracts relating to
employment,  employment  practices,  wages,  hours,  and terms and conditions of
employment,  including,  but not limited to, employee  compensation matters, but
not including ERISA.

                                      -10-

<PAGE>

                  2.15.11  To  DDI's  knowledge,   no  employee  of  DDI  or  an
Subsidiary  is in  violation  of any  term of any  employment  contract,  patent
disclosure  agreement,  noncompetition  agreement,  or  any  other  contract  or
agreement,  or any  restrictive  covenant  relating  to the  right  of any  such
employee  to be  employed  thereby,  or to  use  trade  secrets  or  proprietary
information of others, and the employment of such employees does not subject DDI
or any Subsidiary to any liability.

                  2.15.12 A list of all employees,  officers and  consultants of
DDI and the Subsidiaries and their current compensation is set forth on Schedule
2.15.12, which has been delivered to ISI.

                  2.15.13  Neither DDI nor any  Subsidiary is a party to any (a)
agreement  with any  executive  officer or other key  employee  thereof  (i) the
benefits of which are contingent,  or the terms of which are materially altered,
upon the  occurrence of a transaction  involving DDI in the nature of any of the
transactions  contemplated  by this Agreement and the Agreement of Merger,  (ii)
providing any term of employment or compensation  guarantee,  or (iii) providing
severance benefits or other benefits after the termination of employment of such
employee  regardless of the reason for such  termination of  employment,  or (b)
agreement or plan, including,  without limitation,  any stock option plan, stock
appreciation  rights plan or stock  purchase  plan, any of the benefits of which
will be  materially  increased,  or the  vesting  of  benefits  of which will be
materially   accelerated,   by  the  occurrence  of  any  of  the   transactions
contemplated  by this  Agreement and the Agreement of Merger or the value of any
of  the  benefits  of  which  will  be  calculated  on the  basis  of any of the
transactions contemplated by this Agreement and the Agreement of Merger.

         2.16 Corporate Documents. DDI has made available to ISI for examination
all documents and information  listed in the DDI Schedule of Exceptions or other
Exhibits  called for by this  Agreement  which has been requested by ISI's legal
counsel,  including,  without  limitation,  the  following:  (a) copies of DDI's
Certificate of Incorporation  and Bylaws as currently in effect;  (b) its Minute
Book containing all records of all proceedings,  consents, actions, and meetings
of the shareholders,  the board of directors and any committees thereof; (c) its
stock ledger and journal  reflecting all stock issuances and transfers;  and (d)
all permits,  orders,  and consents issued by any regulatory agency with respect
to DDI, or any securities of DDI, and all applications for such permits, orders,
and consents.

         2.17 No  Brokers.  Neither  DDI nor  any of the  DDI  Shareholders  are
obligated for the payment of fees or expenses of any investment  banker,  broker
or finder in  connection  with the  origin,  negotiation  or  execution  of this
Agreement  or the  Agreement  of Merger or in  connection  with any  transaction
contemplated hereby or thereby.

         2.18  Disclosure.  Neither this Agreement,  its exhibits and schedules,
nor any of the  certificates  or  documents  to be delivered by DDI to ISI under
this Agreement, taken together, contains any untrue statement of a material fact
or omits to state any material  fact  necessary in order to make the  statements
contained  herein and therein,  in light of the  circumstances  under which such
statements were made, not materially misleading.

         2.19 Information  Supplied.  None of the information  supplied or to be
supplied by DDI to its shareholders in connection with any shareholder's meeting
(collectively, "Notice Materials"), at the date such information is supplied and
at the time of the  meeting of the DDI  Shareholders  to be held to approve  the
Merger,  contains or will  contain any untrue  statement  of a material  fact or
omits or will omit to state any material fact  required to be stated  therein or
necessary in order to make the statements therein, in light of the circumstances
under which they are made, not materially misleading.

         2.20 Certain Material  Agreements.  Neither DDI nor any Subsidiary is a
party or subject to any oral or written  material  contracts not entered into in
the ordinary course of business, including, but not limited to any:

                                      -11-

<PAGE>

                  (a)  Contract  providing  for  payments  by or to  DDI  or any
Subsidiary in an aggregate amount of Seventy Five Thousand Dollars  ($75,000) or
more;

                  (b) License  agreement  as  licensor  or licensee  (except for
standard  non-exclusive  hardware  and  software  licenses  granted to  end-user
customers in the ordinary course of business the form of which has been provided
to ISI's counsel);

                  (c)  Material  agreement  for the  lease  of real or  personal
property;

                  (d)  Joint  venture  contract  or  arrangement  or  any  other
agreement that involves a sharing of profits with other persons;

                  (e)   Instrument   evidencing   or   related  in  any  way  to
indebtedness  for borrowed money by way of direct loan, sale of debt securities,
purchase money obligation, conditional sale, guarantee, or otherwise, except for
trade  indebtedness  incurred in the ordinary course of business,  and except as
disclosed in the Financial Statements; or

                  (f) Contract containing covenants purporting to limit DDI's or
any  Subsidiary's  freedom to compete in any line of business in any  geographic
area.

                  All  agreements,   contracts,   plans,  leases,   instruments,
arrangements,  licenses and commitments listed in the DDI Schedule of Exceptions
identified to this Section 2.20 are valid and in full force and effect.  Neither
DDI nor any  Subsidiary  is,  nor, to the  knowledge  of DDI, is any other party
thereto,  in breach or default in any  material  respect  under the terms of any
such agreement,  contract,  plan,  lease,  instrument,  arrangement,  license or
commitment,  which  breach or  default  may  reasonably  be  expected  to have a
material adverse effect on DDI or any Subsidiary.

                  2.21     Books and Records.

                  2.21.1  The  books,  records  and  accounts  of  DDI  and  its
Subsidiaries (a) are in all material  respects true,  complete and correct,  (b)
have been  maintained  in  accordance  with good  business  practices on a basis
consistent with prior years, (c) are stated in reasonable  detail and accurately
and fairly reflect the  transactions  and dispositions of the assets of DDI, and
(d) accurately and fairly reflect the basis for the Financial Statements.

                  2.21.2 DDI has  devised  and  maintains  a system of  internal
accounting  controls  sufficient  to  provide  reasonable  assurances  that  (a)
transactions  are executed in accordance with  management's  general or specific
authorization;  (b)  transactions  are  recorded  as  necessary  (i)  to  permit
preparation  of financial  statements  in  conformity  with  generally  accepted
accounting  principles or any other criteria applicable to such statements,  and
(ii) to maintain  accountability  for assets,  and (c) the amount  recorded  for
assets on the books and records of DDI is compared  with the existing  assets at
reasonable  intervals  and  appropriate  action  is taken  with  respect  to any
differences.

         2.22  Insurance.  DDI and its  Subsidiaries  maintain  and at all times
during  the  prior  three  years  have  maintained  fire and  casualty,  general
liability,  business  interruption,  product liability,  and sprinkler and water
damage insurance which it believes to be reasonably  prudent for similarly sized
and similarly situated businesses.

                                      -12-


<PAGE>



         2.23     Environmental Matters.

                  2.23.1 During the period that DDI and  Subsidiary  have leased
or owned their respective properties or owned or operated any facilities,  there
have been no disposals,  releases or threatened  releases of Hazardous Materials
(as defined below) on, from or under such  properties or facilities.  DDI has no
knowledge  of any  presence,  disposals,  releases  or  threatened  releases  of
Hazardous  Materials  on, from or under any of such  properties  or  facilities,
which may have occurred prior to DDI or any Subsidiary  having taken  possession
of any of such properties or facilities. For the purposes of this Agreement, the
terms "disposal," "release," and "threatened release" shall have the definitions
assigned thereto by the Comprehensive  Environmental Response,  Compensation and
Liability Act of 1980, 42 U.S.C.  ss. 9601 et seq., as amended  ("CERCLA").  For
the purposes of this Agreement "Hazardous Materials" shall mean any hazardous or
toxic  substance,  material  or waste  which is or becomes  prior to the Closing
regulated   under,   or  defined  as  a  "hazardous   substance,"   "pollutant,"
"contaminant,"  "toxic chemical,"  "hazardous  materials,"  "toxic substance" or
"hazardous  chemical" under (1) CERCLA; (2) any similar federal,  state or local
law; or (3) regulations promulgated under any of the above laws or statutes.

                  2.23.2  None of the  properties  or  facilities  of DDI or any
Subsidiary  is in  material  violation  of any  federal,  state  or  local  law,
ordinance,  regulation  or  order  relating  to  industrial  hygiene  or to  the
environmental  conditions  on,  under or about such  properties  or  facilities,
including, but not limited to, soil and ground water condition.  During the time
that DDI or any Subsidiary have owned or leased their respective  properties and
facilities,  neither DDI nor any Subsidiary nor, to DDI's  knowledge,  any third
party,  has used,  generated,  manufactured  or stored  on,  under or about such
properties or facilities or transported to or from such properties or facilities
any Hazardous Materials except in accordance with applicable environmental laws.

                  2.23.3 During the time that DDI or any  Subsidiary  have owned
or  leased  their  respective  properties  and  facilities,  there  has  been no
litigation  brought  or  threatened  against  DDI or any  Subsidiary  by, or any
settlement  reached by DDI or any Subsidiary with, any party or parties alleging
the presence, disposal, release or threatened release of any Hazardous Materials
on, from or under any of such properties or facilities.

         2.24 Interested  Party  Transactions.  No officer or director of DDI or
any  "affiliate"  or  "associate"  (as  those  terms  are  defined  in Rule  405
promulgated  under  the  Securities  Act) of any such  person  has  had,  either
directly or indirectly,  a material  interest in: (i) any person or entity which
purchases  from or sells,  licenses or  furnishes to DDI or any  Subsidiary  any
goods,  property,  technology  or  intellectual  or  other  property  rights  or
services;  or (ii) any contract or agreement to which DDI or any Subsidiary is a
party or by which it may be bound or affected.

3.       REPRESENTATIONS AND WARRANTIES OF ISI AND NEWCO

         ISI and Newco hereby  jointly and  severally  represent  and warrant as
follows,  that, except as set forth on the ISI Schedule of Exceptions  delivered
to DDI as Exhibit 3.0:

         3.1      Organization and Good Standing.

         ISI is a  corporation  duly  organized,  validly  existing  and in good
standing under the laws of the State of California,  and has the corporate power
and  authority  to own,  operate  and lease its  properties  and to carry on its
business as now conducted and as proposed to be conducted, and is qualified as a
foreign  corporation in each  jurisdiction in which a failure to be so qualified
could  reasonably be expected to have a material  adverse  effect on its present
operations or financial condition.


                                      -13-
<PAGE>


         Newco is a corporation  duly  organized,  validly  existing and in good
standing  under the laws of the State of Delaware,  and has the corporate  power
and  authority  to own,  operate  and lease its  properties  and to carry on its
business as now conducted and as proposed to be conducted, and is qualified as a
foreign  corporation in each  jurisdiction in which a failure to be so qualified
could  reasonably be expected to have a material  adverse  effect on its present
operations or financial condition.

         3.2      Power, Authorization and Validity.

                  3.2.1 ISI and Newco have the right,  power, legal capacity and
authority to enter into and perform their obligations under this Agreement,  and
all  agreements  to which ISI and Newco are or will be a party that are required
to be executed pursuant to this Agreement (the "ISI Ancillary Agreements").  The
execution,  delivery and  performance  of this  Agreement  and the ISI Ancillary
Agreements have been duly and validly  approved and authorized by ISI's Board of
Directors and Newco's Board of Directors.

                  3.2.2 No filing,  authorization  or approval,  governmental or
otherwise,  is  necessary  to enable ISI or Newco to enter into,  and to perform
their obligations under, this Agreement and the ISI Ancillary Agreements, except
for (a) the filing of the Agreement of Merger with the  California  Secretary of
State and Delaware Secretary of State, the filing of appropriate  documents with
the relevant authorities of other states in which ISI and Newco are qualified to
do  business,  if any,  and (b) such  filings as may be  required to comply with
federal and state securities laws.

                  3.2.3 This Agreement and the ISI Ancillary  Agreements are, or
when executed by ISI and Newco will be, valid and binding obligations of ISI and
Newco  enforceable in accordance with their respective  terms,  except as to the
effect,  if any, of (a)  applicable  bankruptcy and other similar laws affecting
the  rights  of  creditors  generally,  (b)  rules  of  law  governing  specific
performance,  injunctive  relief  and  other  equitable  remedies  and  (c)  the
enforceability of provisions  requiring  indemnification  in connection with the
offering, issuance or sale of securities;  provided, however, that the Agreement
of Merger will not be  effective  until filed with the  California  Secretary of
State and Delaware Secretary of State.

                  3.2.4 Due Authorization.  The ISI Common Stock to be issued to
DDI Shareholders in the Merger, when issued by ISI pursuant to the terms of this
Agreement,   will  be  duly   authorized,   validly   issued,   fully  paid  and
non-assessable,  will be issued in compliance with applicable  federal and state
securities  laws and  will be free and  clear  of all  liens,  encumbrances  and
adverse claims and may be resold by DDI  affiliates in accordance  with Rule 145
of the Securities Act.

         3.3 No  Violation of Existing  Agreements.  Neither the  execution  and
delivery of this Agreement nor any ISI Ancillary Agreement, nor the consummation
of the transactions contemplated hereby, will conflict with, or (with or without
notice or lapse of time, or both) result in a termination, breach, impairment or
violation of (a) any provision of the Articles of Incorporation or Bylaws of ISI
and Newco,  as currently in effect,  (b) in any material  respect,  any material
instrument or contract to which ISI or Newco is a party or by which ISI or Newco
is bound, or (c) any federal,  state,  local or foreign judgment,  writ, decree,
order, statute, rule or regulation applicable to ISI or Newco or their assets or
properties.

         3.4  Disclosure.  ISI has made available to DDI an investor  disclosure
package  consisting  of ISI's  annual  report on Form 10-K for its  fiscal  year
ending  February 28, 1995 (the "Fiscal Year End"),  all Forms 10-Q and 8-K filed
by ISI  with  the SEC  since  the  Fiscal  Year  End and up to the  date of this
Agreement and all proxy materials  distributed to ISI's  shareholders  since the
Fiscal  Year  End and up to the  date of this  Agreement  (the  "ISI  Disclosure
Package").  The  ISI  Disclosure  Package,  this  Agreement,  the  exhibits  and
schedules  hereto,  and any  certificates  or  documents  to be delivered to DDI
pursuant  to this  Agreement,  when taken  together,  do not  contain any untrue
statement  of a material  fact or omit to state any material  fact  necessary in
order to make the  statements  contained  herein  and  therein,  in light of the
circumstances under which such statements were made, not misleading.

                                      -14-

<PAGE>

         3.5 Absence of Certain  Changes.  Since the Fiscal Year End,  there has
not been any change in the financial condition, properties, assets, liabilities,
business or operations of ISI which change by itself or in conjunction  with all
other such changes,  whether or not arising in the ordinary  course of business,
has had or will have a material  adverse  effect  thereon except as disclosed in
the ISI Disclosure Package.

         3.6 Litigation.  There is no action, proceeding, claim or investigation
pending against ISI before any court or administrative agency that if determined
adversely to ISI may reasonably be expected to have a material adverse effect on
the present or future operations or financial condition of ISI, nor, to the best
of ISI's knowledge, has any such action, proceeding, claim or investigation been
threatened.  There is, to the best of ISI's  knowledge,  no reasonable basis for
any  shareholder  or  former  shareholder  of ISI,  or any other  person,  firm,
corporation,  or entity, to assert a claim against ISI based upon: (a) ownership
or rights to ownership of any shares of ISI Stock (except for dissenter's rights
with  respect to shares of ISI Common  Stock  issuable by virtue of the Merger),
(b) any rights as a ISI Shareholder,  including any option or preemptive  rights
or rights to notice or to vote, or (c) any rights under any agreement  among ISI
and its shareholders.

         3.7 Compliance with Laws. ISI and Newco have complied,  or prior to the
Closing Date will have complied,  and are or will be at the Closing Date in full
compliance,  in all material  respects  with all  applicable  laws,  ordinances,
regulations,  and rules, and all orders, writs, injunctions,  awards, judgments,
and decrees  applicable  to them,  the  violation of which would have a material
adverse effect upon their business.  ISI and Newco have received all permits and
approvals  from,  and have  made all  filings  with,  third  parties,  including
government agencies and authorities, that are necessary in connection with their
present business. To the best of ISI's and Newco's knowledge, there are no legal
or administrative proceedings or investigations pending or threatened,  that, if
enacted or determined  adversely to them,  would result in any material  adverse
change in the present or future operations or financial condition thereof.

         3.8 No Brokers. ISI and Newco are not obligated for the payment of fees
or expenses of any investment  banker,  broker or finder in connection  with the
origin, negotiation or execution of this Agreement or the Agreement of Merger or
in connection with any transaction contemplated hereby or thereby.

4.       DDI PRECLOSING COVENANTS

         During the period from the date of this  Agreement  until the Effective
Time, DDI covenants and agrees as follows:


         4.1 Advice of Changes.  DDI will promptly  advise ISI in writing (a) of
any event  occurring  subsequent to the date of this Agreement that would render
any representation or warranty of DDI contained in this Agreement, if made on or
as of the date of such event or the Closing  Date,  untrue or  inaccurate in any
material  respect  and (b) of any  material  adverse  change in DDI's  business,
results of operations or financial  condition.  To ensure  compliance  with this
Section 4.1, DDI shall  deliver to ISI within  twenty (20) days after the end of
each  monthly  accounting  period  ending after the date of this  Agreement  and
before the Closing Date, an unaudited balance sheet and statement of operations,
which financial statements shall be prepared in the ordinary course of business,
in  accordance  with DDI's books and records and generally  accepted  accounting
principles  and shall fairly  present the financial  position of DDI as of their
respective  dates and the results of DDI's operations for the periods then ended
except  that the  Unaudited  Financial  Statements  will be  subject  to  normal
year-end audit adjustments and will not contain footnotes.

                                      -15-

<PAGE>


         4.2 Maintenance of Business.  DDI will use its best efforts to carry on
and  preserve  its business and its  relationships  with  customers,  suppliers,
employees  and others in  substantially  the same  manner as it has prior to the
date  hereof.  If  DDI  becomes  aware  of  a  material   deterioration  in  the
relationship  with any  material  customer,  supplier or key  employee,  it will
promptly  bring such  information  to the  attention  of ISI in writing  and, if
requested by ISI, will exert its best efforts to restore the relationship.

         4.3 Conduct of Business.  DDI will continue to conduct its business and
maintain  its business  relationships  in the ordinary and usual course and will
not, without the prior written consent of ISI:

                  (a) borrow any money;

                  (b) enter into any  transaction  not in the ordinary course of
business;

                  (c)  encumber  or permit to be  encumbered  any of its  assets
except in the ordinary course of its business  consistent with past practice and
to an extent which is not material;

                  (d) dispose of any  material  portion of its assets  except in
the ordinary course of business consistent with past practice;

                  (e) enter into any material lease or contract for the purchase
or sale of any  property,  real or personal,  except in the  ordinary  course of
business consistent with past practice;

                  (f) fail to maintain  its  equipment  and other assets in good
working condition and repair according to the standards it has maintained to the
date of this Agreement, subject only to ordinary wear and tear;

                  (g) pay any bonus, increased salary or special remuneration to
any officer,  employee or consultant (except in case of employees or consultants
for normal salary increases  consistent with past practices not to exceed Twenty
Thousand  Dollars  ($20,000)  for any single  employee  and except  pursuant  to
existing arrangements previously disclosed to and approved in writing by ISI) or
enter into any new employment or consulting agreement with any such person;

                  (h) change accounting methods;

                  (i)  declare,  set aside or pay any cash or stock  dividend or
other  distribution in respect of capital stock, or redeem or otherwise  acquire
any of its capital stock;

                  (j) amend or terminate any  contract,  agreement or license to
which it is a party except those amended or terminated in the ordinary course of
business, consistent with past practice, and which are not material in amount or
effect;

                  (k) lend any amount to any  person or  entity,  other than (i)
advances  for travel and expenses  which are incurred in the ordinary  course of
business consistent with past practice, not material in amount and documented by
receipts  for the  claimed  amounts;  (ii) any loans  pursuant to the DDI 401(k)
Plan;  or (iii)  amounts  advanced to DDI  employees  through  the DDI  employee
computer loan program.

                  (l) guarantee or act as a surety for any obligation except for
the  endorsement  of checks and other  negotiable  instruments  in the  ordinary
course of business,  consistent  with past  practice,  which are not material in
amount;

                  (m) waive or release any material right or claim except in the
ordinary course of business, consistent with past practice;

                                      -16
<PAGE>

                  (n) issue or sell any shares of its capital stock of any class
(except upon the exercise of an option or warrant currently outstanding), or any
other  of  its  securities,  or  issue  or  create  any  warrants,  obligations,
subscriptions,  options,  convertible securities,  or other commitments to issue
shares of capital stock, or accelerate the vesting of any outstanding  option or
other security;

                  (o) split or combine  the  outstanding  shares of its  capital
stock of any class or enter into any  recapitalization  affecting  the number of
outstanding  shares of its capital  stock of any class or affecting any other of
its securities;

                  (p) merge,  consolidate  or  reorganize  with,  or acquire any
entity;

                  (q) amend its Articles of Incorporation or Bylaws;

                  (r) license any of its  technology  or  intellectual  property
except in the ordinary course of business consistent with past practice;

                  (s) agree to any audit assessment by any tax authority or file
any  federal  or state  income or  franchise  tax return  unless  copies of such
returns have been delivered to ISI for its review prior to filing;

                  (t) change any insurance coverage or issue any certificates of
insurance  except as is routinely done in the ordinary course of DDI's business;
or

                  (u) agree to do, or permit  any  Subsidiary  to do or agree to
do, any of the things described in the preceding clauses 4.3(a) through 4.3(t).

         4.4  Shareholders  Approval.  DDI will  hold a special  meeting  of its
shareholders (the  "Shareholders  Meeting") at the earliest  practicable date to
submit this Agreement,  the Merger and related matters for the consideration and
approval of the DDI  Shareholders,  which  approval will be recommended by DDI's
Board of  Directors  and  management.  Such  meeting  will be  called,  held and
conducted, and any proxies will be solicited, in compliance with applicable law.

         4.5  Proxy  Statement.  DDI will send to its  shareholders  in a timely
manner,  for the  purpose  of  considering  and  voting  upon the  Merger at the
Shareholders  Meeting,  the Notice  Materials.  DDI will  promptly  provide  all
information  relating to its business or  operations  necessary for inclusion in
the Notice Materials to satisfy all requirements of applicable state and federal
securities laws. DDI shall be solely responsible for any statement,  information
or omission in the Notice Materials  relating to it or its affiliates based upon
written  information  furnished  by it.  DDI will not  provide or publish to its
shareholders  any material  concerning  it or its  affiliates  that violates the
Securities Act or the United States Securities Exchange Act of 1934, as amended,
(the "Exchange Act") with respect to the transactions contemplated hereby.

         4.6  Preparation  of Permit  Application,  Hearing  Request and Hearing
Notice.  As promptly as  practicable  after the date  hereof,  ISI and DDI shall
prepare and file with the Commissioner the Permit  Application,  Hearing Request
and Hearing Notice and any other documents required by the California  Corporate
Securities  Law of 1968, as amended in connection  with the Merger.  Each of ISI
and DDI shall  use its best  efforts  to have the  Permit  Application,  Hearing
Request and Hearing Notice  declared  effective  under the California  Corporate
Securities Law of 1968, as amended as promptly as practicable after such filing.

                                      -17-

<PAGE>


         4.7  Regulatory  Approvals.  DDI will execute and file,  or join in the
execution and filing, of any application or other document that may be necessary
in order to obtain the  authorization,  approval or consent of any  governmental
body,  federal,  state,  local or foreign which may be reasonably  required,  or
which ISI may reasonably  request,  in connection  with the  consummation of the
transactions  contemplated by this  Agreement.  DDI will use its best efforts to
obtain all such authorizations, approvals and consents.

         4.8  Necessary  Consents.  DDI will use its best efforts to obtain such
written  consents and take such other actions as may be necessary or appropriate
in addition to those set forth in Section 4.6 to allow the  consummation  of the
transactions  contemplated  hereby  and to allow ISI to carry on DDI's  business
after the Closing.

         4.9 Litigation.  DDI will notify ISI in writing promptly after learning
of any material actions,  suits,  proceedings or investigations by or before any
court,  board  or  governmental  agency,  initiated  by or  against  it  or  any
Subsidiary, or known by it to be threatened against it or any Subsidiary.

         4.10 No Other  Negotiations.  From the date hereof until the earlier of
termination of this Agreement or consummation  of the Merger,  DDI will not, and
will not  authorize  or permit any officer,  director,  employee or affiliate of
DDI, or any other person,  on its behalf to, directly or indirectly,  solicit or
encourage  any offer  from any party or  consider  any  inquiries  or  proposals
received from any other party,  participate in any  negotiations  regarding,  or
furnish to any person any  information  with respect to, or otherwise  cooperate
with,  facilitate  or encourage  any effort or attempt by any person (other than
ISI),  concerning the possible  disposition of all or any substantial portion of
DDI's business,  assets or capital stock by merger, sale or any other means. DDI
will  promptly  notify  ISI  orally  and in  writing  of any such  inquiries  or
proposals.  If DDI merges with,  or DDI or its assets are acquired by, a company
other than ISI or a  wholly-owned  subsidiary of ISI during a period of one year
after the date hereof based on any discussions  during said period,  DDI (or the
acquiring  company)  will pay ISI the sum of One Million Five  Hundred  Thousand
Dollars  ($1,500,000);  provided,  however, DDI shall not be required to pay any
sums  hereunder in the event DDI terminates  this Agreement  pursuant to Section
1.1.1.  Notwithstanding  the  foregoing,  ISI shall not be  entitled to any sums
hereunder in the event ISI  unilaterally  causes the Merger not to occur for any
reason,  including,  without  limitation,  the failure of ISI to satisfy any ISI
condition  to  Closing  or in the event  the  Merger  does not  occur  because a
condition of Closing is not satisfied due to no fault of DDI.

         4.11 Access to Information.  Until the Closing,  DDI and ISI will allow
the other party and its agents reasonable access the files,  books,  records and
offices of the other party's and each Subsidiary, including, without limitation,
any and all  information  relating  to the  other  party's  taxes,  commitments,
contracts,  leases,  licenses,  and real,  personal and intangible  property and
financial  condition  to the same extent that the other party did during the due
diligence  period.  DDI will cause its accountants to cooperate with ISI and its
agents in making  available  all  financial  information  reasonably  requested,
including without  limitation the right to examine all working papers pertaining
to all financial statements prepared or audited by such accountants.

         4.12  Satisfaction  of  Conditions  Precedent.  DDI  will  use its best
efforts to satisfy or cause to be satisfied all the conditions  precedent  which
are set  forth in  Section  8, and DDI will use its best  efforts  to cause  the
transactions  contemplated  by this Agreement to be  consummated,  and,  without
limiting  the  generality  of  the   foregoing,   to  obtain  all  consents  and
authorizations  of third  parties  and to make all  filings  with,  and give all
notices to, third  parties that may be necessary or  reasonably  required on its
part in order to effect the transactions contemplated hereby.

                                      -18-

<PAGE>


         4.13 DDI  Affiliates  Agreements.  To ensure  that the  issuance of ISI
Common Stock in the Merger  complies with the Securities Act and that the Merger
will be  accounted  for as a  "pooling  of  interests,"  concurrently  with  the
execution of this  Agreement  DDI will deliver to ISI a letter  identifying  all
persons who are, in DDI's reasonable  judgment,  "affiliates" of DDI at the time
this  Agreement  is  executed,  including,  all persons or entities  who own ten
percent (10%) or greater of DDI Common Stock,  assuming in that  calculation all
DDI Options have been exercised (the "Principal Shareholders"). DDI will provide
ISI  with all  information  and  documents  needed  to  evaluate  this  list for
compliance  with  securities  laws.  DDI will  cause each of its  affiliates  to
deliver to ISI,  on or prior to the mailing of the Notice  Materials,  a written
agreement  (the  "DDI  Affiliates  Agreement"),  in the  form of  Exhibit  4.13,
providing that such person (i) has not made and will not make any disposition of
DDI Common Stock in the 30 day period prior to the Effective Time, (ii) will not
offer to sell,  sell or otherwise  dispose of any of the ISI Common Stock issued
to such person in the Merger in  violation  of the  Securities  Act and Rule 145
promulgated thereunder, as they may be amended from time to time, and (iii) will
make no  disposition  of ISI Stock after the Effective Time until ISI shall have
publicly  released a report including the combined  financial results of ISI and
DDI for a period of at least 30 days of combined  operations of ISI and DDI; and
(b) such  other  representations  as may be  reasonably  requested  by ISI,  its
accountants or its attorneys for the purpose of ensuring  "pooling of interests"
accounting.

         4.14 Principal Shareholder  Representations.  To ensure that the Merger
will qualify as a reorganization for federal income tax purposes, DDI will cause
each of the Principal Shareholders to execute, at or before the Closing, the DDI
Affiliates  Agreement which contains a representation  that such shareholder has
no present plan or  intention  to sell or  otherwise  dispose of more than fifty
percent (50%) of the shares of ISI Common Stock which the shareholders  receives
in the  Merger  and  making  such  other  representations  as may be  reasonably
requested by ISI, its  accountants  or its attorneys for the purpose of ensuring
such tax treatment.

         4.15 DDI Dissenting  Shares.  As promptly as practicable after the date
of the DDI  Shareholders'  Meeting  and  prior to the  Closing  Date,  DDI shall
furnish ISI with the name and address of each DDI Dissenting Shareholder and the
number of DDI Dissenting Shares owned by such DDI Dissenting Shareholder.

         4.16 Non-Competition Agreements. DDI shall assist ISI in obtaining from
Marco Thompson an agreement,  in form and substance  attached  hereto as Exhibit
8.14,  not to  compete  with  the  business  of DDI and  ISI  (or any  successor
corporations)  for a period of three (3) years after the  Effective  Time of the
Merger.

         4.17  Pooling  Accounting.  DDI shall use its best efforts to cause the
business  combination  to be  effected  by the Merger to be  accounted  for as a
pooling of interests. DDI shall use its best efforts to cause its Affiliates not
to take any action that would adversely affect the ability of ISI to account for
the business combination to be effected by the Merger as a pooling of interests.

         4.18 Blue Sky Laws. DDI shall use its best efforts to assist ISI to the
extent  necessary  to  comply  with  the  securities  and  Blue  Sky laws of all
jurisdictions which are applicable in connection with the Merger.

         4.19 Assumption of Loan for Office Building.  DDI shall assume the loan
obligations of Marco and Laura  Thompson  under a Small Business  Administration
Loan dated April 10, 1989 (the "Loan") in  conjunction  with the  assignment  of
ownership of the Office  Building E, located at 5415 Oberlin  Drive,  San Diego,
California  (the "Office  Building") by Marco and Laura Thompson to DDI pursuant
to the Office Building Purchase Agreement by and between DDI and Marco and Laura
Thompson,  attached  hereto as Exhibit  4.19A  (the  "Office  Building  Purchase
Agreement").  The Lease  dated  January 1, 1989  between DDI and Marco and Laura
Thompson (the "Lease") shall be terminated  simultaneously with the execution of
the  Office  Building  Purchase  Agreement.  Marco and Laura  Thompson  agree to
relinquish  their  rights to such number of shares of ISI Common Stock issued to
them  pursuant  to  Section  1.1.1  hereof  equal in  value,  as  determined  in
accordance  with Section  1.1.1 hereof,  to the amount by which the  outstanding
balance of the 

                                      -19-
<PAGE>

Loan  exceeds the fair market  value of the Office  Building,  which fair market
value is  determined  pursuant to the appraisal  provided by an "MIA"  certified
appraiser, which is attached hereto as Exhibit 4.19B.

         4.20 Life  Insurance.  The named  beneficiary  on those life  insurance
policies covering Marco Thompson and Laura Thompson,  for which the premiums are
currently  being paid by DDI, shall remain as is, with the cash surrender  value
of the policies  remaining as an asset of DDI and Marco and Laura Thompson shall
assume all obligations for payment of the premiums, effective as of Closing. DDI
will not surrender the cash value without the prior written consent of Marco and
Laura Thompson.

         4.21 Waivers from  Security  Holders.  DDI shall obtain fully  executed
security  holder  consent and waiver of rights forms from each current  security
holder of shares or options of DDI,  with an exception for up to a total of five
percent (5%) of all outstanding shares and options,  in the form attached hereto
as Exhibit 4.21 (the "Security Holder Consent and Waiver of Rights").

         4.22 Waivers Related to Employment  Matters and  Intellectual  Property
Matters.  Until and  including  on December 24,  1995,  DDI shall take  whatever
reasonable actions are deemed necessary by ISI,  including,  but not limited to,
obtaining fully executed waivers in a form satisfactory to ISI from such persons
by whom a claim would have a material  adverse effect on the business of DDI, as
reasonably deemed necessary by ISI, concerning any employment related matters or
intellectual property related matters, as requested by ISI.

5.       ISI PRECLOSING COVENANTS

         During the period from the date of this  Agreement  until the Effective
Time, ISI covenants and agrees as follows:

         5.1 Advice of Changes.  ISI will promptly  advise DDI in writing (a) of
any event  occurring  subsequent to the date of this Agreement that would render
any representation or warranty of ISI contained in this Agreement, if made on or
as of the date of such event or the Closing  Date,  untrue or  inaccurate in any
material  respect  and (b) of any  material  adverse  change in ISI's  business,
results of operations or financial condition.

         5.2  Regulatory  Approvals.  ISI will execute and file,  or join in the
execution and filing, of any application or other document that may be necessary
in order to obtain the  authorization,  approval or consent of any  governmental
body, federal,  state, local or foreign,  which may be reasonably  required,  or
which DDI may reasonably  request,  in connection  with the  consummation of the
transactions  contemplated by this  Agreement.  ISI will use its best efforts to
obtain all such authorizations, approvals and consents.

         5.3 Satisfaction of Conditions Precedent. ISI will use its best efforts
to satisfy or cause to be satisfied all the conditions  precedent  which are set
forth in Section 7, and ISI will use its best efforts to cause the  transactions
contemplated  by this  Agreement to be  consummated  and,  without  limiting the
generality of the foregoing,  to obtain all consents and authorizations of third
parties and to make all filings  with,  and give all notices to,  third  parties
that may be necessary or reasonably  required on its part in order to effect the
transactions contemplated hereby.

         5.4 ISI  Affiliates  Agreements.  To  ensure  that the  Merger  will be
accounted for as a "pooling of interests," ISI will cause each of its affiliates
to sign and deliver to ISI, on or prior to the mailing of the Notice  Materials,
a written  agreement (the "ISI  Affiliates  Agreement"),  in the form of Exhibit
5.4, providing that such person will make no disposition of ISI Common Stock (a)
in the 30 day period prior to the Effective Time or (b) after the Effective Time
until ISI shall have publicly released a report including the combined financial
results of ISI and DDI for a period of at least 30 days of  combined  operations
of ISI and DDI.

                                      -20-

<PAGE>

         5.5  Preparation  of Permit  Application,  Hearing  Request and Hearing
Notice.  As promptly  as  practicable  after the date  hereof,  ISI,  with DDI's
assistance, shall prepare and file with the Commissioner the Permit Application,
Hearing  Request  and  Hearing  Notice and any other  documents  required by the
California  Corporate  Securities Law of 1968, as amended in connection with the
Merger.  ISI,  with  DDI's  assistance,  shall use its best  efforts to have the
Permit Application,  Hearing Request and Hearing Notice declared effective under
the  California  Corporate  Securities  Law of 1968,  as amended as  promptly as
practicable after such filing.

         5.6 Blue Sky Laws.  ISI shall  take such steps as may be  necessary  to
comply  with the  securities  and Blue Sky laws of all  jurisdictions  which are
applicable in connection with the Merger.

         5.7  Pooling  Accounting.  ISI shall use its best  efforts to cause the
business  combination  to be  effected  by the Merger to be  accounted  for as a
pooling of interests. ISI shall use its best efforts to cause its Affiliates not
to take any action that would adversely affect the ability of ISI to account for
the business combination to be effected by the Merger as a pooling of interests.

6.       CLOSING MATTERS

         6.1 The Closing.  Subject to  termination of this Agreement as provided
in Section 9 below,  the  Closing  will take  place at the  offices of Fenwick &
West, Two Palo Alto Square,  Palo Alto,  California 94306 at 1:30 p.m.,  Pacific
Standard Time on or before  January 26, 1996,  or, if all  conditions to closing
have not been satisfied or waived by such date, such other place,  time and date
as DDI and ISI may mutually select (the "Closing Date").  Concurrently  with the
Closing,  the Agreement of Merger will be filed in the office of the  California
Secretary of State and the  Certificate  of Merger will be filed with the office
of the Delaware  Secretary of State.  The Agreement of Merger  provides that the
Merger shall become effective upon filing.

         6.2      Exchange of Certificates.

                  6.2.1 As of the Effective Time, all shares of DDI Common Stock
that are outstanding immediately prior thereto will, by virtue of the Merger and
without further  action,  cease to exist and will be converted into the right to
receive  from ISI the number of shares of ISI  Common  Stock  determined  as set
forth in Section 1.1.1, subject to Sections 1.1.3 and 1.2.

                  6.2.2 As soon as practicable  after the Effective  Time,  each
holder  of  shares of DDI  Common  Stock  that are not  Dissenting  Shares  will
surrender  the  certificate(s)  for such shares (the "DDI  Certificates"),  duly
endorsed  as  requested  by ISI,  to ISI for  cancellation.  Promptly  after the
Effective  Time and  receipt  of such DDI  Certificates,  ISI will issue to each
tendering  holder a certificate  for the number of shares of ISI Common Stock to
which such holder is entitled pursuant to Section 1.1.1 hereof,  less the shares
of ISI Common Stock  deposited into escrow  pursuant to Section 1.4 hereof,  and
distribute any cash payable under Section 1.2.

                  6.2.3 No  dividends  or  distributions  payable  to holders of
record of ISI Common Stock after the Effective  Time, or cash payable in lieu of
fractional  shares,  will  be  paid  to  the  holder  of any  unsurrendered  DDI
Certificate(s)  until the holder of the DDI  Certificate(s)  surrenders such DDI
Certificate(s).  Subject to the effect, if any, of applicable  escheat and other
laws, following surrender of any DDI Certificate, there will be delivered to the
person  entitled  thereto,  without  interest,  the amount of any  dividends and
distributions  therefor  paid with respect to ISI Common Stock so withheld as of
any date subsequent to the Effective Time and prior to such date of delivery.

                                      -21-

<PAGE>


                  6.2.4 All ISI Common Stock delivered upon the surrender of DDI
Common  Stock in  accordance  with the terms  hereof will be deemed to have been
delivered  in full  satisfaction  of all  rights  pertaining  to such DDI Common
Stock. There will be no further  registration of transfers on the stock transfer
books of DDI or its  transfer  agent of the DDI  Common  Stock.  If,  after  the
Effective  Time,  DDI  Certificates  are presented for any reason,  they will be
canceled and exchanged as provided in this Section 6.2.

                  6.2.5  Until   certificates   representing  DDI  Common  Stock
outstanding prior to the Merger are surrendered pursuant to Section 6.2.2 above,
such certificates will be deemed, for all purposes, to evidence ownership of the
number of shares of ISI Stock  into  which the DDI  Common  Stock will have been
converted, reduced by the number of shares withheld as Escrow Shares.

         6.3 Assumption of Options.  Promptly after the Effective Time, ISI will
notify in  writing  each  holder of a DDI Option of the  assumption  of such DDI
Option  by ISI,  and the  number of shares  of ISI  Common  Stock  that are then
subject to such option and the  exercise  price of such  option,  as  determined
pursuant to Sections 1.1 and 1.3 hereof.

7.       CONDITIONS TO OBLIGATIONS OF DDI

         DDI's   obligations   hereunder  are  subject  to  the  fulfillment  or
satisfaction, on and as of the Closing, of each of the following conditions (any
one or more of which may be waived by DDI, but only in a writing signed by DDI):

         7.1 Accuracy of Representations and Warranties. The representations and
warranties  of ISI set forth in  Section 3 shall be true and  accurate  in every
material  respect on and as of the Closing  with the same force and effect as if
they had been made at the Closing,  and DDI shall receive a certificate  to such
effect executed by ISI's President and Chief Financial Officer.

         7.2  Covenants.  ISI shall have  performed and complied in all material
respects  with all of its  covenants  contained  in  Section 5 on or before  the
Closing,  and DDI shall  receive a  certificate  to such effect  signed by ISI's
President and Chief Financial Officer.

         7.3 Absence of Material  Adverse Change.  There shall not have been, in
the reason- able judgment of the Board of Directors of DDI, any material adverse
change in the business or financial condition of ISI.

         7.4 Compliance with Law. There shall be no order,  decree, or ruling by
any  court or  governmental  agency  or threat  thereof,  or any  other  fact or
circumstance,   which  would  prohibit  or  render   illegal  the   transactions
contemplated by this Agreement.

         7.5 Government Consents.  There shall have been obtained at or prior to
the Closing Date such permits or authorizations, and there shall have been taken
such other action, as may be required to consummate the Merger by any regulatory
authority having  jurisdiction  over the parties and the actions herein proposed
to be taken,  including but not limited to requirements under applicable federal
and state securities laws.

         7.6 Opinion of ISI's  Counsel.  DDI shall have received from counsel to
ISI, an opinion substantially in the form of Exhibit 7.6.

         7.7 Shareholder Approval. The principal terms of this Agreement and the
Agreement of Merger shall have been approved and adopted by DDI Shareholders, as
required by applicable law and DDI's Articles of Incorporation and Bylaws.

                                      -22-
<PAGE>

         7.8 Tax Opinion.  DDI shall have received a tax opinion from counsel to
DDI that the Merger constitutes a "reorganization" within the meaning of Section
368 of the Internal Revenue Code.

         7.9 No Litigation.  No litigation or proceeding  shall be threatened or
pending for the purpose or with the probable  effect of enjoining or  preventing
the consummation of any of the transactions contemplated by this Agreement.

         7.10 Employment Agreements.  DDI shall have received executed copies of
Employment  Agreements  executed by ISI, DDI and Marco Thompson in substantially
the form of Exhibit 8.15.

         7.11 Satisfactory Form of Legal and Accounting Matters. The form, scope
and substance of all legal and accounting  matters  contemplated  hereby and all
closing  documents  and other papers  delivered  hereunder  shall be  reasonably
acceptable to DDI's counsel.

         7.12  Consents.  DDI shall have received  duly  executed  copies of all
material  third-party  consents and approvals  contemplated by this Agreement in
form and substance reasonably  satisfactory to DDI, except for such consents and
approvals as ISI and DDI shall have agreed shall not be obtained.

         7.13  Fairness  Hearing.  ISI shall have  received  the issuance of the
Permit by the California Department of Corporations following a Fairness Hearing
for this  Merger and the  issuance  of the ISI Common  Stock  shall be an exempt
transaction under Section 3(a)(10) of the Securities Act.

8.       CONDITIONS TO OBLIGATIONS OF ISI

         The  obligations  of ISI  hereunder are subject to the  fulfillment  or
satisfaction on, and as of the Closing, of each of the following conditions (any
one or more of which may be waived by ISI, but only in a writing signed by ISI):

         8.1 Accuracy of Representations and Warranties. The representations and
warranties  of DDI set forth in  Section 2 shall be true and  accurate  in every
material  respect on and as of the Closing  with the same force and effect as if
they had been made at the Closing,  and ISI shall receive a certificate  to such
effect executed by DDI's President and Chief Financial Officer.

         8.2  Covenants.  DDI shall have  performed and complied in all material
respects  with all of its  covenants  contained  in  Section 4 on or before  the
Closing,  and ISI shall  receive a  certificate  to such effect  signed by DDI's
President and Chief Financial officer.

         8.3 Absence of Material  Adverse Change.  There shall not have been, in
the reason- able judgment of the Board of Directors of ISI, any material adverse
change in the business or financial condition of DDI.

         8.4 Compliance with Law. There shall be no order,  decree, or ruling by
any  court or  governmental  agency  or threat  thereof,  or any  other  fact or
circumstance,   which  would  prohibit  or  render   illegal  the   transactions
contemplated by this Agreement.

         8.5 Government Consents.  There shall have been obtained at or prior to
the Closing Date such permits or authorizations, and there shall have been taken
such other action, as may be required to consummate the Merger by any regulatory
authority having  jurisdiction  over the parties and the actions herein proposed
to be taken,  including but not limited to requirements under applicable federal
and state securities laws.

         8.6 Opinion of DDI's  Counsel.  ISI shall have received from counsel to
DDI, an opinion substantially in the form of Exhibit 8.6.

                                     -23-
<PAGE>

         8.7  Consents.  ISI shall have  received  duly  executed  copies of all
material third-party consents, approvals,  assignments,  waivers, authorizations
or other  certificates  contemplated  by this  Agreement  or the ISI Schedule of
Exceptions or reasonably  deemed necessary by ISI's legal counsel to provide for
the continuation in full force and effect of any and all material  contracts and
leases of DDI and for ISI to consummate the transactions  contemplated hereby in
form and substance  reasonably  satisfactory  to ISI, except for such thereof as
ISI and DDI shall have agreed shall not be obtained,  as contemplated by the ISI
Schedule of Exceptions.

         8.8 No Litigation.  No litigation or proceeding  shall be threatened or
pending for the purpose or with the probable  effect of enjoining or  preventing
the consummation of any of the transactions  contemplated by this Agreement,  or
which  could be  reasonably  expected to have a material  adverse  effect on the
present or future operations or financial condition of DDI.

         8.9 Requisite Approvals.  The principal terms of this Agreement and the
Agreement of Merger shall have been approved and adopted by DDI Shareholders, as
required by applicable law and DDI's  Certificate of  Incorporation  and Bylaws,
and by DDI's Board of Directors.

         8.10 Dissenting Shares. The Dissenting Shares shall not constitute more
than two  percent  (2%) of the  total  number  of  shares  of DDI  Common  Stock
outstanding immediately prior to the Effective Time.

         8.11 Escrow.  ISI shall have received an Escrow  Agreement  executed by
DDI and  Marco J.  Thompson,  as the  Representative  for all DDI  Shareholders,
providing for the escrow of the Escrow Shares on the terms and conditions of the
Escrow Agreement.

         8.12 Affiliates Agreements and Principal  Shareholder  Representatives.
DDI shall have  delivered to ISI the letter  required by Section 4.13 naming all
persons who are  Principal  Shareholders  for  purposes of Section  4.14 and all
persons  who  are  "affiliates"  of DDI  for  purposes  of Rule  145  under  the
Securities  Act,  and each such person shall have  executed and  delivered a DDI
Affiliates Agreement to ISI in accordance with Sections 4.13 and 4.14.

         8.13  Pooling  Opinion.  ISI's  accounting  firm,  Coopers  and Lybrand
("ISI's Auditors"),  shall have received from DDI's accounting firm, McGladrey &
Pullen, LLP ("DDI's Auditors"),  an opinion, in form and substance  satisfactory
to ISI's  Auditors,  to the effect that DDI's Auditors are not aware of any fact
concerning  DDI that  would  preclude  ISI from  accounting  for the Merger as a
pooling  of  interests,  and ISI shall have  received  from  ISI's  Auditors  an
opinion,  in form and  substance  satisfactory  to ISI,  that the Merger will be
treated as a "pooling of interests" for accounting purposes.

         8.14  Non-Competition  Agreements.  ISI shall  have  received  executed
copies of Non-Competition Agreements executed by ISI, DDI and Marco Thompson, in
substantially the form of Exhibit 8.14.

         8.15 Employment Agreements.  ISI shall have received executed copies of
Employ-ment  Agreements executed by ISI, DDI and Marco Thompson in substantially
the form of Exhibit 8.15.

         8.16  Resignation  of  Directors.   The  directors  of  DDI  in  office
immediately  prior  to the  Effective  Time  of the  Merger  (other  than  Marco
Thompson)  shall  have  resigned  as  directors  of  the  Surviving  Corporation
effective as of the Effective Time of the Merger.

         8.17 Satisfactory Form of Legal and Accounting Matters. The form, scope
and substance of all legal and accounting  matters  contemplated  hereby and all
closing  documents  and other papers  delivered  hereunder  shall be  reasonably
acceptable to ISI's counsel.

                                      -24-
<PAGE>

         8.18  Consents.  ISI shall have received  duly  executed  copies of all
material  third-party  consents and approvals  contemplated by this Agreement in
form and substance reasonably  satisfactory to ISI, except for such consents and
approvals as ISI and DDI shall have agreed shall not be obtained.

         8.19 Tax Opinion. ISI shall have received a tax opinion from counsel to
ISI that the Merger constitutes a "reorganization" within the meaning of Section
368 of the Internal Revenue Code.

         8.20 Fairness Hearing.  ISI shall have received the issuance the Permit
by the California  Department of Corporations  following a Fairness  Hearing for
this  Merger  and the  issuance  of the ISI  Common  Stock  shall  be an  exempt
transaction under Section 3(a)(10) of the Securities Act.

         8.21 Price. The price of ISI Common Stock used in calculating the Total
ISI Shares pursuant to Section 1.1.1 will be at least $27.50.

         8.22 Office  Building.  Marco and Laura Thompson shall have transferred
physical  possession  and valid title in the Office  Building to DDI pursuant to
the terms of the Office Building Purchase  Agreement.  The Lease shall have been
terminated.

         8.23 Life  Insurance  Policies.  Marco and Laura  Thompson  shall  have
assumed the obligation for payment of the premiums of the policies.

         8.24 Waivers  from  Security  Holders.  DDI shall have  obtained  fully
executed Security Holder Consent and Waiver of Rights from such current security
holders of DDI, as specified in Section 4.21 hereof.

         8.25 Waivers Related to Employment  Matters and  Intellectual  Property
Matters.  DDI shall have taken whatever  reasonable  actions deemed necessary by
ISI,  including,  but not limited to, obtaining fully executed waivers in a form
satisfactory  to ISI from such  persons  by whom a claim  would  have a material
adverse  effect on the business of DDI, as deemed  reasonably  necessary by ISI,
concerning any  employment  related  matters or  intellectual  property  related
matters, as requested by ISI pursuant to Section 4.22 hereof.

9.       TERMINATION OF AGREEMENT

         9.1      Prior to Closing.

                  9.1.1 This  Agreement  may be  terminated at any time prior to
the Closing by the mutual written consent of each of the parties hereto.

                  9.1.2  Unless  otherwise  agreed by the parties  hereto,  this
Agreement will be terminated if the Closing shall not have occurred on or before
January 26, 1996.

         9.2 At the Closing.  At the Closing,  this  Agreement may be terminated
and abandoned:

                  9.2.1  By ISI if any of  the  conditions  precedent  to  ISI's
obligations  set forth in Section 8 above have not been  fulfilled  or waived at
and as of the Closing; or

                  9.2.2  By DDI if any of  the  conditions  precedent  to  DDI's
obligations  set forth in Section 7 above have not been  fulfilled  or waived at
and as of the Closing.


                  Any  termination of this Agreement under this Section 9.2 will
be  effective by the  delivery of notice of the  terminating  party to the other
party hereto.

                                      -25-

<PAGE>

         9.3 No Liability.  Any  termination of this Agreement  pursuant to this
Section 9 will be without  further  obligation  or  liability  upon any party in
favor of the other party hereto other than the obligations  provided in Sections
10.2 and  11.16 and in the  Nondisclosure  Agreement  between  DDI and ISI dated
November 27, 1995, which will survive  termination of this Agreement;  provided,
however,  that nothing  herein will limit the  obligation  of DDI and ISI to use
their  best  efforts  to cause  the  Merger to be  consummated,  as set forth in
Sections 4.11 and 5.3 hereof, respectively.

10.      SURVIVAL OF REPRESENTATIONS, INDEMNIFICATION AND REMEDIES, CONTINUING 
         COVENANTS

         10.1 Survival of Representations.  All representations,  warranties and
covenants of ISI contained in this Agreement  will remain  operative and in full
force and effect,  regardless of any  investigation  made by or on behalf of the
parties  to  this  Agreement,  until  the  earlier  of the  termination  of this
Agreement or one year after the Closing Date,  whereupon  such  representations,
warranties  and covenants  will expire (except for covenants that by their terms
survive  for  a  longer  period).   Unless  otherwise   specified  herein,   all
representations, warranties and covenants of DDI will survive the Effective Time
and will  continue  until the  expiration of the one year period set forth above
and covenants that by their terms survive thereafter will continue to survive in
accordance with their terms.

         10.2 Agreement to Indemnify.  Subject to the  limitations  set forth in
this Section 10, DDI will  indemnify  and hold  harmless  ISI and its  officers,
directors,  agents and employees,  and each person,  if any, who controls or may
control ISI within the meaning of the  Securities Act  (hereinafter  referred to
individually  as  an  "Indemnified  Person"  and  collectively  as  "Indemnified
Persons")  from and  against  any and all claims,  demands,  actions,  causes of
actions,  losses,  costs, damages,  liabilities and expenses including,  without
limitation, reasonable legal fees (hereinafter referred to as "Damages"):

                  (a)  Arising  out of any  misrepresentation  or  breach  of or
default in connection with any of the representations,  warranties and covenants
given  or  made  by DDI  in  this  Agreement  or any  certificate,  document  or
instrument  delivered  by or on behalf of DDI pursuant  hereto  (other than with
respect  to  changes  in  the  truth  or  accuracy  of the  representations  and
warranties of DDI under this Agreement  after the date hereof if DDI has advised
ISI of such changes in an update to Exhibit 2.0  delivered  prior to the Closing
and ISI has nonetheless proceeded with the Closing); or

                  (b) Resulting from any failure of any DDI Shareholders to have
good,  valid and marketable title to the issued and outstanding DDI Common Stock
held by such  shareholders,  free  and  clear  of all  liens,  claims,  pledges,
options, adverse claims,  assessments or charges of any nature whatsoever, or to
have full right,  capacity and  authority to vote such DDI Common Stock in favor
of the  Merger  and the other  transactions  contemplated  by the  Agreement  of
Merger.

         In  seeking   indemnification  for  Damages  under  this  Section,  the
Indemnified  Persons shall  exercise  their  remedies with respect to the Escrow
Shares  and  any  other  assets  deposited  in  escrow  pursuant  to the  Escrow
Agreement;  provided,  however,  that no such claim for Damages will be asserted
after the  expiration  of the Escrow  Period.  Except for  intentional  fraud or
willful  misconduct  or  breach  of  any  of the  provisions  of the  Affiliates
Agreement:  (i) no DDI  Shareholder  shall have any liability to an  Indemnified
Person  under  this  Agreement  except to the  extent of such DDI  Shareholder's
Escrow Shares and any other assets deposited under the Escrow Agreement and (ii)
the remedies set forth in this Section 10.2 shall be the  exclusive  remedies of
ISI and the other Indemnified Persons hereunder against any DDI Shareholder.

11.      MISCELLANEOUS

         11.1  Governing  Law.  The  internal  laws of the  State of  California
(irrespective  of its  conflict of law  principles)  will govern the validity of
this  Agreement,  the  construction  of its terms,  and the  interpretation  and
enforcement of the rights and duties of the parties hereto.

                                      -26-

<PAGE>

         11.2  Assignment;  Binding Upon  Successors and Assigns.  Neither party
hereto may assign any of its rights or obligations  hereunder  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.

         11.3  Severability.   If  any  provision  of  this  Agreement,  or  the
application  thereof,  will for any  reason  and to any  extent  be  invalid  or
unenforceable, the remainder of this Agreement and application of such provision
to other persons or circumstances will be interpreted so as reasonably to effect
the intent of the parties hereto. The parties further agree to replace such void
or  unenforceable  provision  of this  Agreement  with a valid  and  enforceable
provision that will achieve, to the extent possible, the economic,  business and
other purposes of the void or unenforceable provision.

         11.4  Counterparts.  This  Agreement  may be  executed in any number of
counterparts,  each of which  will be an  original  as regards  any party  whose
signature  appears thereon and all of which together will constitute one and the
same   instrument.   This  Agreement  will  become  binding  when  one  or  more
counterparts hereof, individually or taken together, will bear the signatures of
both parties reflected hereon as signatories.

         11.5 Other Remedies.  Except as otherwise  provided herein, any and all
remedies herein expressly  conferred upon a party will be deemed cumulative with
and not exclusive of any other remedy  conferred hereby or by law on such party,
and the exercise of any one remedy will not preclude the exercise of any other.

         11.6 Amendment and Waivers. Any term or provision of this Agreement may
be  amended,  and the  observance  of any term of this  Agreement  may be waived
(either  generally  or in a  particular  instance  and either  retroactively  or
prospectively)  only by a writing signed by the party to be bound  thereby.  The
waiver by a party of any breach hereof or default in the performance hereof will
not be deemed to  constitute  a waiver of any other  default  or any  succeeding
breach or default.  The  Agreement  may be amended by the parties  hereto at any
time before or after approval of the DDI Shareholders, but, after such approval,
no amendment will be made which by applicable law requires the further  approval
of the DDI Shareholders without obtaining such further approval.

         11.7  No  Waiver.  The  failure  of any  party  to  enforce  any of the
provisions  hereof  will not be  construed  to be a waiver  of the right of such
party thereafter to enforce such provisions.

         11.8  Expenses.  Whether or not the  transaction  contemplated  by this
Agreement is  consummated,  ISI will pay the  reasonable  fees (not to exceed an
aggregate of $125,000) of DDI's accountants,  attorneys, and other professionals
related to the transaction contemplated hereby.

         11.9  Attorneys'  Fees.  Should suit be brought to enforce or interpret
any part of this Agreement, the prevailing party will be entitled to recover, as
an element of the costs of suit and not as damages,  reasonable  attorneys' fees
to be fixed by the court (including without limitation, costs, expenses and fees
on any appeal).  The  prevailing  party will be entitled to recover its costs of
suit, regardless of whether such suit proceeds to final judgment.

         11.10 Notices. Any notice or other communication  required or permitted
to be  given  under  this  Agreement  will  be in  writing,  will  be  delivered
personally  or by  registered  or certified  mail,  postage  prepaid and will be
deemed given upon delivery, if delivered personally, or three days after deposit
in the mails, if mailed, to the following addresses:


                                      -27-

<PAGE>


                  (i)      If to ISI:

                           Integrated Systems, Inc.
                           3260 Jay Street
                           Santa Clara, CA  95054
                           Attention:  President

                  (ii)     If to DDI:

                           5415 Oberlin Drive
                           San Diego, CA  92121
                           Attention:  President

or to such other  address as a party may have  furnished to the other parties in
writing pursuant to this Section 11.10.

         11.11 Construction of Agreement.  This Agreement has been negotiated by
the respective  parties hereto and their  attorneys and the language hereof will
not be construed  for or against  either  party.  A reference to a Section or an
exhibit will mean a Section in, or exhibit to, this Agreement  unless  otherwise
explicitly set forth. The titles and headings herein are for reference  purposes
only and will not in any manner limit the  construction  of this Agreement which
will be considered as a whole.

         11.12 No Joint  Venture.  Nothing  contained in this  Agreement will be
deemed or construed as creating a joint  venture or  partnership  between any of
the parties  hereto.  No party is by virtue of this  Agreement  authorized as an
agent,  employee or legal  representative of any other party. No party will have
the power to control the activities and operations of any other and their status
is, and at all times, will continue to be, that of independent  contractors with
respect  to each  other.  No party will have any power or  authority  to bind or
commit any  other.  No party will hold  itself  out as having any  authority  or
relationship in contravention of this Section.

         11.13 Further Assurances. Each party agrees to cooperate fully with the
other parties and to execute such further instruments,  documents and agreements
and to give such further  written  assurances as may be reasonably  requested by
any other party to evidence and reflect the  transactions  described  herein and
contemplated  hereby and to carry into effect the  intents and  purposes of this
Agreement.

         11.14 Absence of Third Party Beneficiary  Rights. No provisions of this
Agreement are intended, nor will be interpreted,  to provide or create any third
party  beneficiary  rights  or any  other  rights  of any  kind  in any  client,
customer,  affiliate,  shareholder,  partner  or any  party  hereto or any other
person or entity unless  specifically  provided otherwise herein, and, except as
so provided,  all provisions  hereof will be personal solely between the parties
to this Agreement.

         11.15 Public  Announcement.  Upon  execution  of the  Agreement by both
parties,  and until the consummation of the Merger, all press releases and other
public and private  communications  shall be made by the  parties  only with the
mutual written consent of DDI and ISI.


                                      -28-
<PAGE>


         11.16  Confidentiality.  DDI and ISI  each  recognize  that  they  have
received and will receive confidential  information  concerning the other during
the course of the Merger negotiations and preparations. Accordingly, ISI and DDI
each agrees (a) to use its respective  best efforts to prevent the  unauthorized
disclosure of any confidential  information  concerning the other that was or is
disclosed  during  the  course of such  negotiations  and  preparations,  and is
clearly designated in writing as confidential at the time of disclosure, and (b)
to not make use of or permit to be used any such confidential  information other
than for the purpose of effectuating  the Merger and related  transactions.  The
obligations of this section will not apply to information that (i) is or becomes
part of the public domain,  (ii) is disclosed by the  disclosing  party to third
parties without  restrictions on disclosure,  (iii) is received by the receiving
party from a third party  without  breach of a  nondisclosure  obligation to the
other party or (iv) is required to be  disclosed  by law. If this  Agreement  is
terminated, all copies of documents containing confidential information shall be
returned by the receiving party to the disclosing party.

         11.17  Entire  Agreement.   This  Agreement  and  the  exhibits  hereto
constitute  the entire  understanding  and agreement of the parties  hereto with
respect to the subject matter hereof and supersede all prior and contemporaneous
agreements or  understandings,  inducements or  conditions,  express or implied,
written  or oral,  between  the  parties  with  respect  hereto  other  than the
Nondisclosure Agreement between DDI and ISI dated November 27, 1995. The express
terms hereof  control and  supersede any course of  performance  or usage of the
trade inconsistent with any of the terms hereof.

         IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as
of the date first above written.


"ISI"                                          "DDI"

Integrated Systems, Inc.                       Dr. Design, Inc.


By: /s/ Naren K. Gupta                         By: /s/ Marco Thompson
    ----------------------------                   --------------------------

Its:  Chairman of the Board                    Its:  Chief Executive Officer
     ---------------------------                   --------------------------


"NEWCO"

ISI Purchasing Corporation


By: /s/ David P. St. Charles
    ------------------------------------------

Its:  President and Chief Executive Officer
     -----------------------------------------




            [SIGNATURE PAGE FOR AGREEMENT AND PLAN OF REORGANIZATION]


<PAGE>


                                LIST OF EXHIBITS


Exhibit A              Agreement of Merger

Exhibit 1.4            Escrow Agreement

Exhibit 1.7A*          ISI Officers Tax Certificate

Exhibit 1.7B*          DDI Officers Tax Certificate

Exhibit 2.0*           DDI Schedule of Exceptions

Schedule  2.3*         List of all holders and numbers  held of DDI Common Stock
                       and DDI options.

Schedule 2.8*          DDI's Audited Financial Statements and
                       Unaudited Financial Statements.

Schedule  2.11*        Material  Contracts,  Obligations  or  Commitments in
                       excess of $75,000.

Schedule 2.12*         DDI IP Rights Agreements

Schedule 2.15.1*       DDI Employee Plans.

Schedule 2.15.6*       DDI Benefit Arrangements.

Schedule 2.15.12*      List of all Employees, Officers and Consultants of DDI.

Exhibit 3.0*           ISI Schedule of Exceptions

Exhibit 4.13*          DDI Affiliates Agreement

Exhibit 4.19A          Office Building Purchase Agreement between  DDI and
                       Marco and Laura Thompson

Exhibit 4.19B*         Appraisal of Office Building

Exhibit 4.21*          Security Holder Consent and Waiver of Rights
                       form

Exhibit 5.4*           ISI Affiliates Agreement

Exhibit 7.6*           Opinion of ISI's Counsel

Exhibit 8.6*           Opinion of DDI's Counsel

Exhibit 8.14           NonCompetition Agreement with ISI, DDI and
                       Marco Thompson

Exhibit 8.15           Employment Agreement with ISI, DDI, and  Marco
                       Thompson


- ---------------------
*Omitted schedules.  The Company agrees to furnish  supplementally a copy of any
omitted schedule to the Commission upon request.

<PAGE>

                              OFFICER'S CERTIFICATE



Sharon Pinto hereby certifies that:

                  1. She is a Vice President of DR.  DESIGN,  INC., a California
corporation (the "Company").

                  2. The  Agreement  of  Merger  to which  this  certificate  is
attached,  after having been first duly  approved by the Board of Directors  and
shareholders  of the  Company,  was duly  signed on behalf of the Company by the
undersigned and Laura Thompson, Vice President and Secretary,  respectively,  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.

                  The  undersigned  declares  under penalty of perjury under the
laws of the State of Delaware that the matters set forth in this Certificate are
true and correct of her own knowledge.

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




- --------------------------------
Sharon Pinto, Vice President





<PAGE>

                              OFFICER'S CERTIFICATE



         David St. Charles hereby certifies that:

                  1.  He is the  President  of  ISI  Purchasing  Corporation,  a
Delaware corporation ("Newco").

                  2. The  Agreement  of  Merger  to which  this  certificate  is
attached,  after having been first duly  approved by the Board of Directors  and
the sole shareholder of the Company, was duly signed on behalf of the Company by
the undersigned and by Narendra Gupta, Secretary of the Company.

                  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.

                  The  undersigned  declares  under penalty of perjury under the
laws of the State of Delaware that the matters set forth in this Certificate are
true and correct of his own knowledge.

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




- ------------------------------------
David St. Charles, President





<PAGE>



                             AGREEMENT OF MERGER OF
                           ISI PURCHASING CORPORATION,
                             A DELAWARE CORPORATION,
                                  WITH AND INTO
                                DR. DESIGN, INC.,
                            A CALIFORNIA CORPORATION


         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").

         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.

<PAGE>


         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 SURVIVING CORPORATION.  Dr. Design, Inc., a California corporation,
will be the surviving corporation of the Merger.

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.

         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.

                                      -2-
<PAGE>


         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.

5.       SERVICE OF PROCESS

         After the Effective Time, the Company agrees that it may be served with
process  in the State of  Delaware  in any  proceeding  for  enforcement  of any
obligation of Newco,  as well as for  enforcement  of any  obligation of Company
arising from the Merger,  including any suit or other  proceeding to enforce the
right of any stockholders as determined in appraisal proceedings pursuant to the
provisions  of ss.  262 of the  Delaware  General  Corporation  Law,  and  shall
irrevocably appoint the Secretary of State of the State of Delaware as its agent
to accept service of process in any such suit or other proceedings.  The address
to which copies of any such service of process upon the Secretary of State shall
be mailed to is:

                                          Dr. Design, Inc.
                                          5415 Oberlin Drive
                                          San Diego, CA  92121
                                          Attn: President






                    [THE REST OF THIS PAGE HAS INTENTIONALLY
                                BEEN LEFT BLANK]

                                      -3-

<PAGE>



         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:                                            By:
    -------------------------------------         ------------------------------
      Sharon Pinto, Vice President                 Laura Thompson, Secretary



ISI PURCHASING CORPORATION


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







                      SIGNATURE PAGE TO AGREEMENT OF MERGER

                                      -4-
<PAGE>


                                    EXHIBIT 1

                              AMENDED AND RESTATED
                            ARTICLES OF INCORPORATION
                               OF DR. DESIGN, INC.



                                      -5-

<PAGE>
                             CERTIFICATE OF APPROVAL

                                       OF

                               AGREEMENT OF MERGER



         Marco Thompson and Laura Thompson certify that:

                  1. They are the 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 __ day of  January,
1996.


- ---------------------------                        -----------------------------
Marco Thompson, President                          Laura Thompson, Secretary



<PAGE>


                             CERTIFICATE OF APPROVAL

                                       OF

                               AGREEMENT OF MERGER



         David St. Charles and Narendra Gupta 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 __ day of January,
1996.


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



<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").

         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.


<PAGE>

         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.

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.

         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.

                                      -2-

<PAGE>

         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:      _____________________________
 Laura Thompson, Secretary                       Marco Thompson, President



                                          NEWCO


 ___________________________     By:      _____________________________
 Narendra Gupta, Secretary                       David St. Charles, President











                      SIGNATURE PAGE TO AGREEMENT OF MERGER

                                      -3-
<PAGE>


                                    EXHIBIT 1



                              AMENDED AND RESTATED
                            ARTICLES OF INCORPORATION
                               OF DR. DESIGN, INC.





                                      -4-

<PAGE>




                             CERTIFICATE OF APPROVAL


                                       OF

                               AGREEMENT OF MERGER



         Sharon Pinto and Laura Thompson 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 __ day of  January,
1996.


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







<PAGE>

                                                                     EXHIBIT 1.4


                                ESCROW AGREEMENT



                This Escrow  Agreement (this  "Agreement") is entered into as of
December  14,  1995,  by  and  among  Integrated  Systems,  Inc.,  a  California
corporation ("ISI"), those individuals listed on Exhibit A, attached hereto, who
are the principal shareholders (the "Holders") of Dr. Design, Inc., a California
corporation  ("DDI"),  Marco  J.  Thompson  as  Representative  of  the  Holders
("Representative")  and  Chemical  Trust  Company of  California,  a  California
corporation, as "Escrow Agent".

                A.  DDI and ISI  have  entered  into an  Agreement  and  Plan of
Reorganization  dated as of December 14, 1995 (the "Plan") pursuant to which ISI
Purchasing  Corporation,  a wholly owned  subsidiary of ISI ("Newco") will merge
with and into DDI, with DDI surviving the merger as a wholly owned subsidiary of
ISI. The  capitalized  terms used in this  Agreement and not  otherwise  defined
herein  will have the  meanings  given  them in the Plan.  A copy of the Plan is
simultaneously being delivered to the Escrow Agent.

                B. Pursuant to the Plan,  an aggregate of 371,607  shares of ISI
Common Stock are to be issued in the Merger to the Holders.

                C. The Plan  provides for shares  equaling ten percent  (10%) of
the shares of ISI Common  Stock that are issued in the Merger to the Holders and
ten  percent  (10%) of the shares  issuable  upon  exercise  of the DDI  Options
assumed  by ISI (the  "Escrow  Shares")  to be  deducted  from the shares of ISI
Common Stock issued to the Holders and placed in an escrow  account (the "Escrow
Account") to secure certain indemnification  obligations of DDI to ISI and other
Indemnified  Persons (as defined in Section  10.2 of the Plan) under the Plan on
the terms and  conditions  set forth herein.  The Escrow  Shares  required to be
deposited in the Escrow Account  pursuant to this Agreement are shown on Exhibit
A attached hereto.

                D.  The  parties  hereto  desire  to  establish  the  terms  and
conditions  pursuant to which the Escrow Shares will be deposited,  held in, and
disbursed from the Escrow Account.

                NOW, THEREFORE, the parties hereto hereby agree as follows:

                1.       ESCROW AND INDEMNIFICATION

                         (a) Escrow of Shares. Promptly after the Effective Time
of the Merger, ISI or its transfer agent will deposit the Escrow Shares with the
Escrow Agent, who will hold them in escrow as collateral for the indemnification
obligations of the Holders under Section 10.2 of the Plan until the Escrow Agent
is  required  to  release  such  Escrow  Shares  pursuant  to the  terms of this
Agreement.  The Escrow Shares will include  "Additional  Escrow  Shares" as that
term is defined in Section 2(b) of this  Agreement.  The Escrow  Shares shall at
all  times be free from and not be  subject  to any  lien,  attachment,  trustee
process or any other judicial  process of any creditor of any party hereto.  The
Escrow  Agent  agrees to accept  delivery of the Escrow  Shares and to hold such
Escrow Shares in escrow subject to the terms and conditions of this Agreement.


<PAGE>


                         (b)  Indemnification.  ISI  and the  other  Indemnified
Persons are indemnified pursuant to the terms of Section 10.2 of the Plan (which
terms are  incorporated  herein by reference)  from and against any Damages,  as
defined in the Plan, subject to the limitations set forth in Section 10.2 of the
Plan and herein. (For purposes of this Agreement, references to ISI will include
all other  Indemnified  Persons,  as  applicable.)  The  Escrow  Shares  will be
security for this indemnity obligation,  subject to the limitations,  and in the
manner  provided,  in  Sections  1.4 and 10.2 of the  Plan  and this  Agreement.
Promptly after the receipt by ISI of notice or discovery of any claim, damage or
legal action or proceeding giving rise to indemnification rights under the Plan,
ISI will give the  Representative  and the Escrow Agent  written  notice of such
claim, damage, legal action or proceeding (a "Claim") in accordance with Section
3 hereof.  Notwithstanding the foregoing, ISI may not make any Claim for Damages
under  Section  10.2 of the Plan  after the Final  Release  Date,  as defined in
Section  2(c) hereof.  Within five (5) days of delivery of such written  notice,
the  Representative  may,  with  ISI's  written  consent,  which  shall  not  be
unreasonably  withheld,  at the  expense  of the  Holders,  elect  to  take  all
necessary  steps  properly to contest any Claim  involving  third  parties or to
prosecute such Claim to conclusion or settlement.  If the  Representative  makes
the  foregoing  election,  ISI will  have the  right to  participate  at its own
expense in all proceedings.  If the Representative  does not make such election,
ISI shall be free to handle  the  prosecution  or  defense of any such Claim and
will notify the  Representative  of the progress of any such Claim,  will permit
the Representative,  at the sole cost of the  Representative,  to participate in
such prosecution or defense and will provide the Representative  with reasonable
access to all relevant  information and documentation  relating to the Claim and
ISI's  prosecution or defense thereof.  In any case, the party not in control of
the Claim will cooperate with the other party in the conduct of the  prosecution
or defense of such Claim. Neither party will compromise or settle any such Claim
without the  written  consent of either ISI (if the  Representative  defends the
Claim) or the Representative (if ISI defends the Claim),  such consent not to be
unreasonably withheld.

                         (c) Limitation on Liability. The maximum liability of a
Holder under Section 10.2 of the Plan and under this  Agreement  (other than for
intentional  fraud or willful  misconduct),  and ISI's sole and exclusive remedy
under  Section 10.2 of the Plan and under this  Agreement  will be the number of
Escrow Shares set forth next to each such Holder's name on Exhibit A.

                2.       DEPOSIT OF ESCROW SHARES; RELEASE FROM ESCROW.

                         (a) Delivery of Escrow Shares. On the Closing Date, the
Escrow  Shares  allocable  to a Holder (the  "Initial  Escrow  Shares")  will be
delivered  by  ISI's  transfer  agent  to the  Escrow  Agent in the form of duly
authorized  stock  certificates  issued in the  respective  names of the  Holder
thereof  together with endorsed stock powers.  On the Closing Date,  each of the
Holders will deliver to ISI's transfer agent a duly endorsed stock power bearing
a  medallion  stamp  guarantee  in the form of  Exhibit B  attached  hereto.  In
addition,  upon  exercise by a Holder  after the  Closing  Date and prior to the
Final Release Date of any DDI stock options assumed by ISI pursuant to the Plan,
ISI will  deliver to the Escrow  Agent the Escrow  Shares  attributable  to such
option  exercise.  In the event ISI  issues  any  Additional  Escrow  Shares (as
defined below),  such shares will be issued and delivered to the Escrow Agent in
the same manner as the Escrow Shares delivered on the Closing Date.

                         (b) Dividends,  Voting and Rights of Ownership.  Except
for tax-free  dividends paid in stock declared with respect to the Escrow Shares
pursuant to Section 305(a) of the Code  ("Additional  Escrow Shares"),  any cash
dividends,  dividends  payable in securities or other  distributions of any kind
made in respect of the Escrow  Shares will be  distributed  currently  by ISI to
each Holder.  The Holder will have the right to vote the Escrow Shares deposited
in the Escrow  Account  for the  account of such  Holder so long as such  Escrow
Shares are held in escrow,  and ISI will take all reasonable  steps necessary to
allow the exercise of such rights.  While the Escrow Shares remain in the Escrow
Agent's possession  pursuant to this Agreement,  the Holder will retain and will
be able to exercise all other  incidents of ownership of said Escrow Shares that
are not inconsistent with the terms and conditions hereof.


                                      -2-

<PAGE>

                         (c)  Distribution  to Holder.  Within five (5) business
days after (a) public release of ISI's audited financial results together with a
report thereon from ISI's independent  auditors covering the combined results of
ISI and DDI for the first fiscal year of ISI ending after the Closing Date,  for
items expected to be encountered in the audit process (but such period to end no
later than one (1) year from the Closing  Date),  provided that ISI shall have a
reasonable  period of time,  not to exceed ninety (90) days, to review the audit
results to determine if any claim for Damages  exists under  Section 10.2 of the
Plan and ISI shall provide notice of any Claim hereof within the ninety (90) day
period,  a copy of which  press  release  shall be  immediately  provided to the
Escrow  Agent by ISI,  and (b) twelve (12) months after the Closing Date for all
other items (the "Final  Release  Date"),  the Escrow  Agent will  release  from
escrow to each Holder his Escrow Shares, plus all Additional Escrow Shares, less
(A) any Escrow Shares  delivered to ISI in  accordance  with Section 4 hereof in
satisfaction  of Claims by ISI and (B) any Escrow Shares  subject to delivery to
ISI in  accordance  with  Section 4 hereof with  respect to any then pending but
unresolved  Claims of ISI. Any Escrow Shares held as a result of clause (B) will
be released to the Holder or released to ISI for  cancellation  (as appropriate)
promptly upon resolution of each specific Claim involved.

                         (d) Release of Shares.  The Escrow  Shares will be held
by the Escrow  Agent  until  required to be  released  pursuant to Section  2(c)
above.  Within five (5) business days after the release condition is met, Escrow
Agent will deliver to the Holders the  requisite  number of Escrow  Shares to be
released on such date as identified by ISI and the  Representative to the Escrow
Agent in  writing.  Such  delivery  will be in the form of stock  certificate(s)
issued in the name of such  Holders.  ISI and the  Representative  undertake  to
deliver a timely  notice to the Escrow  Agent  identifying  the number of Escrow
Shares to be released within such five (5) day period. ISI will take such action
as may be necessary to cause stock  certificates to be issued in the name of the
Holders.  In the  event  any  Escrow  Shares  are  subject  to Rule  145  resale
restrictions,  certificates  representing  Escrow Shares held for the account of
the Holders  who were  affiliates  of DDI on the date of the Plan or  thereafter
will bear a legend  indicating  such resale  restrictions.  Cash will be paid in
lieu of fractions of Escrow Shares in an amount equal to the product  determined
by multiplying such fraction by the price  determined  pursuant to Section 1.1.1
of the Plan (such price being  hereafter  referred to as the  "Closing  Price").
Within five (5) business days after written request from the Representative, ISI
will submit a  certified  schedule of the cash  amounts  payable for  fractional
shares and will deposit with the Escrow Agent  sufficient funds to pay such cash
amounts for fractional shares.

                         (e) No Encumbrance.  No Escrow Shares or any beneficial
interest  therein may be pledged,  sold,  assigned or transferred,  including by
operation  of law, by a Holder or be taken or reached by any legal or  equitable
process in satisfaction of any debt or other liability of the Holder (other than
such Holder's obligations under Section 10.2 of the Plan), prior to the delivery
to such Holder of the Escrow Shares by the Escrow Agent.

                         (f) Power to Transfer  Escrow Shares.  The Escrow Agent
is hereby granted the power to effect any transfer of Escrow Shares contemplated
by this Agreement.  ISI will cooperate with the Escrow Agent in promptly issuing
stock certificates to effect such transfers.

                3.       NOTICE OF CLAIM.

                         (a)  Each  notice  of a Claim by ISI  (the  "Notice  of
Claim") will be in writing and will  contain the  following  information  to the
extent it is reasonably available to ISI:

                                   (i)  ISI's   good  faith   estimate   of  the
reasonably  foreseeable  maximum amount of the alleged Damages (which amount may
be the amount of damages claimed by a third party plaintiff in an action brought
against ISI or DDI based on alleged  facts,  which if true,  would  constitute a
breach of DDI's representations and warranties); and

                                      -3-

<PAGE>


                                   (ii) A brief description in reasonable detail
of the facts,  circumstances  or events giving rise to the alleged Damages based
on ISI's good faith belief thereof, including,  without limitation, the identity
and address of any third-party  claimant (to the extent reasonably  available to
ISI) and copies of any formal demand or complaint.

                         (b) The  Escrow  Agent  will  not  transfer  any of the
Escrow  Shares held in the Escrow  Account to ISI  pursuant to a Notice of Claim
until such Notice of Claim has been resolved in accordance with Section 4 below.

                4.  RESOLUTION OF NOTICE OF CLAIM AND TRANSFER OF ESCROW SHARES.
Any Notice of Claim received by the Representative and the Escrow Agent pursuant
to Section 3 above will be resolved as follows:

                         (a)   Uncontested   Claims.   In  the  event  that  the
Representative does not contest a Notice of Claim in writing to the Escrow Agent
and ISI and does not pay the amount  demanded  within  thirty (30) calendar days
after a Notice  of Claim  containing  a  statement  of the  claimed  Damages  is
delivered  pursuant to Section  4(b) below,  the Escrow  Agent will  immediately
transfer to ISI for  cancellation  that number of Escrow  Shares  having a value
(determined  pursuant  to Section  4(c)  hereof)  equal to the amount of Damages
specified  in the Notice of Claim which will be  allocated  among the Holders in
proportion  to their  percentage  interests  in the  Escrow  Shares set forth on
Exhibit A, and will notify the Representative of such transfer.

                         (b)   Contested   Claims.   In  the   event   that  the
Representative gives written notice contesting all, or a portion of, a Notice of
Claim to ISI and the Escrow Agent (a "Contested Claim") within the 30-day period
provided  above,  matters that are subject to third party claims brought against
ISI or DDI in a litigation or arbitration  will await the final decision,  award
or settlement of such  litigation or  arbitration.  Any portion of the Notice of
Claim that is not contested will be resolved as set forth above in Section 4(a).
The final  decision of the  arbitrator  or judge will be furnished to the Escrow
Agent,  the  Representative  and ISI in writing and will constitute a conclusive
determination of the issue in question,  binding upon the Holders and ISI. After
notice that the Notice of Claim is contested by the  Representative,  the Escrow
Agent will continue to hold in the Escrow  Account  Escrow Shares having a value
(determined  pursuant to Section  4(c)  hereof)  sufficient  to cover such Claim
(notwithstanding  the  expiration of the Final Release Date) until (i) execution
of a  settlement  agreement  by ISI  and  the  Representative  setting  forth  a
resolution of the Notice of Claim,  or (ii) receipt of a copy of the final award
of the arbitrator or judge.

                                   (i) Arbitration. Any Contested Claim shall be
settled by arbitration in Santa Clara County, California,  and, except as herein
specifically stated, in accordance with the commercial  arbitration rules of the
American Arbitration  Association ("AAA Rules") then in effect.  However, in all
events,  these  arbitration  provisions shall govern over any conflicting  rules
which may now or hereafter be contained in the AAA Rules.  Any judgment upon the
award rendered by the arbitrator may be entered in any court having jurisdiction
over the subject  matter  thereof.  The  arbitrator  shall have the authority to
grant any equitable  and legal  remedies that would be available in any judicial
proceeding instituted to resolve a Contested Claim.

                                   (ii)  Compensation  of  Arbitrator.  Any such
arbitration will be conducted before a single arbitrator who will be compensated
for his or her  services  at a rate to be  determined  by the  parties or by the
American  Arbitration  Association,  but based upon  reasonable  hourly or daily
consulting  rates for the  arbitrator  in the event the  parties are not able to
agree upon his or her rate of compensation.

                                   (iii)  Selection of Arbitrator.  The American
Arbitration  Association  will have the authority to select an arbitrator from a
list of arbitrators who are qualified to handle any Claim made hereunder.

                                      -4-

<PAGE>

                                   (iv)  Payment of Costs.  ISI and the  Holders
will each pay fifty percent (50%) of the initial  compensation to be paid to the
arbitrator  in any such  arbitration  and  fifty  percent  (50%) of the costs of
transcripts   and  other  normal  and  regular   expenses  of  the   arbitration
proceedings;  provided,  however,  that the prevailing  party in any arbitration
will be  entitled  to an award of  attorneys'  fees and costs,  and all costs of
arbitration,  including  those  provided  for above,  will be paid by the losing
party, and the arbitrator will be authorized to make such determinations.  DDI's
liability for such fees and expenses of arbitration will be paid by ISI and will
be recovered as a Claim hereunder out of the Escrow Shares.

                                   (v) Burden of Proof. For any Arbitrable Claim
submitted  to  arbitration,  the  burden of proof  will be as it would be if the
claim were litigated in a judicial proceeding.

                                   (vi)  Award.   Upon  the  conclusion  of  any
arbitration  proceedings hereunder,  the arbitrator will render findings of fact
and conclusions of law and a written opinion setting forth the basis and reasons
for any decision  reached and will deliver such  documents to each party to this
Agreement along with a signed copy of the award.

                                   (vii) Terms of  Arbitration.  The  arbitrator
chosen in  accordance  with these  provisions  will not have the power to alter,
amend or  otherwise  affect  the terms of these  arbitration  provisions  or the
provisions of this Agreement or the Plan.

                                   (viii)    Exclusive    Remedy.    Except   as
specifically  otherwise provided in this Agreement or the Plan, arbitration will
be the sole and exclusive remedy of the parties for any Arbitrable Claim arising
out of this Agreement.

                         (c) Determination of Amount of Claims.  Any amount owed
to ISI  hereunder,  determined  pursuant to Section  4(a) or (b) above,  will be
immediately  payable  to ISI out of the  Escrow  Shares  then held by the Escrow
Agent on a pro rata  basis  between  the  Holders  at a per share  value for all
Escrow Shares equal to the Closing Price of ISI Common Stock ($34.20).

                         (d) No Exhaustion of Remedies. ISI need not exhaust any
other  remedies  that may be  available  to it but  shall  proceed  directly  in
accordance  with the  provisions of this  Agreement.  ISI may  institute  Claims
against the Escrow Shares and in satisfaction thereof may recover Escrow Shares,
in accordance with the terms of this Agreement,  without making any other Claims
directly against the Holders and without rescinding or attempting to rescind the
transactions consummated pursuant to the Plan. The assertion of any single Claim
for  indemnification  hereunder  will not bar ISI from  asserting  other  Claims
hereunder.

                5.       LIMITATION OF ESCROW AGENT'S LIABILITY.

                         (a) The  Escrow  Agent  will  incur no  liability  with
respect to any action  taken or  suffered  by it in  reliance  upon any  notice,
direction,  instruction,  consent, statement or other document believed by it to
be genuine and duly authorized, nor for any other action or inaction, except its
own willful misconduct or gross negligence.  The Escrow Agent shall have no duty
to inquire into or investigate the validity, accuracy or content of any document
delivered  to it. The Escrow Agent will not be  responsible  for the validity or
sufficiency of this  Agreement.  In all questions  arising under this Agreement,
the Escrow Agent may rely on the advice or opinion of counsel,  and for anything
done,  omitted  or  suffered  in good faith by the  Escrow  Agent  based on such
advice, the Escrow Agent will not be liable to anyone. The Escrow Agent will not
be  required  to take any action  hereunder  involving  any  expense  unless the
payment  of  such  expense  is  made  or  provided  for in a  manner  reasonably
satisfactory to it.

                                      -5-

<PAGE>


                         (b)  In the  event  conflicting  demands  are  made  or
conflicting  notices are served upon the Escrow Agent with respect to the Escrow
Account,  the Escrow Agent will have the absolute  right,  at the Escrow Agent's
election,  to do either or both of the following:  (i) resign so a successor can
be  appointed  pursuant to Section 9 hereof or (ii) file a suit in  interpleader
and obtain an order from a court of competent jurisdiction requiring the parties
to interplead  and litigate in such court their several  claims and rights among
themselves.  In the event such  interpleader  suit is brought,  the Escrow Agent
will  thereby be fully  released  and  discharged  from all further  obligations
imposed  upon it under this  Agreement,  and ISI will pay the  Escrow  Agent all
costs,  expenses  and  reasonable  attorney's  fees  expended or incurred by the
Escrow  Agent  pursuant to the  exercise  of Escrow  Agent's  rights  under this
Section 5 (such costs,  fees and expenses will be treated as extraordinary  fees
and  expenses  for the  purposes of Section 8 hereof).  ISI shall be entitled to
reimbursement  from the Holders of any extraordinary fees and expenses of Escrow
Agent in the event ISI prevails in such dispute pursuant to Section 8 hereof.

                         (c) Each other  party  hereto,  jointly  and  severally
(each an "Indemnifying Party" and together the "Indemnifying  Parties"),  hereby
covenants  and agrees to reimburse,  indemnify  and hold harmless  Escrow Agent,
Escrow Agent's officers, directors, employees, counsel and agents (severally and
collectively,  "Escrow Agent"), from and against any loss, damage,  liability or
loss suffered,  incurred by, or asserted against Escrow Agent (including amounts
paid in  settlement  of any  action,  suit,  proceeding,  or  claim  brought  or
threatened to be brought and  including  reasonable  expenses of legal  counsel)
arising out of, in  connection  with or based upon any act or omission by Escrow
Agent  (and/or any of its  officers,  directors,  employees,  counsel or agents)
relating in any way to this Agreement or Escrow Agent's services hereunder. This
indemnity  shall  exclude  gross  negligence  and willful  misconduct  on Escrow
Agent's part. Anything in this Agreement to the contrary notwithstanding,  in no
event shall the Escrow  Agent be liable for special,  indirect or  consequential
loss or  damage  of any  kind  whatsoever  (including  but not  limited  to lost
profits),  even if the Escrow Agent has been advised of the  likelihood  of such
loss or damage and regardless of the form of action.

                         (d) Each Indemnifying  Party may participate at its own
expense  in the  defense  of any claim or action  that may be  asserted  against
Escrow Agent, and if the Indemnifying Parties so elect, the Indemnifying Parties
may assume the defense of such claim or action; provided, however, that if there
exists a conflict  of  interest  that would make it  inappropriate,  in the sole
discretion  of the Escrow Agent,  for the same counsel to represent  both Escrow
Agent and the Indemnifying Parties, Escrow Agent's retention of separate counsel
shall  be  reimbursable  as  herein  above  provided.  Escrow  Agent's  right to
indemnification hereunder shall survive Escrow Agent's resignation or removal as
Escrow Agent and shall  survive the  termination  of this  Agreement by lapse of
time or otherwise.

                         (e) Escrow Agent hereby warrants that Escrow Agent will
notify each Indemnifying  Party by letter, or by telephone or telecopy confirmed
by letter,  of any  receipt by Escrow  Agent of a written  assertion  of a claim
against Escrow Agent, or any action commenced  against Escrow Agent,  within ten
(10) business days after Escrow Agent's receipt of written notice of such claim.
However,  Escrow Agent's failure to so notify each Indemnifying  Party shall not
operate in any manner  whatsoever  to  relieve  an  Indemnifying  Party from any
liability that it may have otherwise than on account of this Section 5.

                         (f)  Escrow  Agent  may  execute  any of its  powers or
responsibilities  hereunder and exercise any rights hereunder either directly or
by or through its agents or attorneys.  The Escrow Agent shall have no liability
for  the  conduct  of  any  outside  attorneys,  accountants  or  other  similar
professionals  it retains.  Nothing in this Agreement  shall be deemed to impose
upon Escrow Agent any duty to qualify to do business or to act as a fiduciary or
otherwise in any jurisdiction other than the State of California.


                                      -6-
<PAGE>


                6. NOTICES.  All notices,  instructions and other communications
required or permitted  to be given  hereunder  or  necessary  or  convenient  in
connection  herewith  must be in writing and will be deemed  delivered  (i) when
personally  served  or when  delivered  by telex or  facsimile  (to the telex or
facsimile  number of the  person to whom the  notice is  given),  (ii) the first
business day following the date of deposit with an overnight  courier service or
(iii) on the earlier of actual  receipt or the third  business day following the
date on which the notice is  deposited in the United  States  mail,  first class
certified, postage prepaid, addressed as follows:

If to the Escrow Agent:           Chemical Trust Company of California
                                  50 California Street, 10th Floor
                                  San Francisco, CA 94111

                                  Attn:  Corporate Trust Department

If to ISI:                        Integrated Systems, Inc.
                                  3260 Jay Street
                                  Santa Clara, California 95054
                                  Attn:  Chief Financial Officer

With a copy to:                   Fred M. Greguras, Esq.
                                  Fenwick & West
                                  Two Palo Alto Square, Suite 800
                                  Palo Alto, California 94306

If to the Representative:         Marco J. Thompson
                                  5415 Oberlin Drive
                                  San Diego, CA 92121

With a copy to:                   Frederick T. Muto
                                  Cooley, Godward, Castro, Huddleson & Tatum
                                  4365 Executive Drive, Suite 1200
                                  San Diego, CA 92121-2128
                                  Phone: (619) 550-6000
                                  Fax: 619-453-3555

or to such other address as ISI, the  Representative or the Escrow Agent, as the
case may be,  designates  in a writing  delivered  to each of the other  parties
hereto.

                7.       GENERAL.

                         (a) Governing  Law,  Assigns.  This  Agreement  will be
governed by and construed in  accordance  with the internal laws of the State of
California  without  regard to  conflict-of-law  principles  and will be binding
upon,  and inure to the  benefit  of, the  parties  hereto and their  respective
successors and permitted assigns.

                         (b) Counterparts. This Agreement may be executed in two
or more counterparts, each of which will be deemed an original, but all of which
together will constitute one and the same instrument.

                         (c) Entire Agreement.  Except as otherwise set forth in
the Plan and the  Agreement of Merger,  this  Agreement  constitutes  the entire
understanding and agreement of the parties with respect to the subject matter of
this Agreement and supersedes all prior agreements or understandings, written or
oral, between the parties with respect to the subject matter hereof.

                                      -7-
<PAGE>


                         (d)  Waivers.  No  waiver  by any  party  hereto of any
condition or of any breach of any provision of this  Agreement will be effective
unless in writing.  No waiver by any party of any such  condition or breach,  in
any one  instance,  will be deemed to be a further or  continuing  waiver of any
such  condition  or breach or a waiver of any other  condition  or breach of any
other provision contained herein.

                         (e) Tax  Identification  Numbers.  Each  party  hereto,
other than the  Escrow  Agent,  shall  provide  the Escrow  Agent with their Tax
Identification Number (TIN) as assigned by the Internal Revenue Service prior to
the execution of this Agreement.

                8. EXPENSES OF ESCROW AGENT. All fees and expenses of the Escrow
Agent  incurred  in the  ordinary  course  of  performing  its  responsibilities
hereunder will be paid by ISI upon receipt of a written invoice by Escrow Agent.
Any extraordinary  fees and expenses,  including without  limitation any fees or
expenses  (including  the fees or  expenses  of  counsel  to the  Escrow  Agent)
incurred by the Escrow Agent in connection with a dispute over the  distribution
of Escrow Shares or the validity of a Notice of Claim,  will be paid by ISI upon
receipt of a written invoice by Escrow Agent. The Holders will be liable for any
extraordinary fees and expenses of the Escrow Agent arising in connection with a
dispute hereunder, in the event ISI prevails in such dispute. Such extraordinary
fees and expenses will be paid by ISI and recovered as a Claim  hereunder out of
the Escrow  Shares.  The Escrow Agent shall have no duty to solicit any payments
which may be due it hereunder.

                9. SUCCESSOR ESCROW AGENT. In the event the Escrow Agent becomes
unavailable or unwilling to continue in its capacity herewith,  the Escrow Agent
may resign and be discharged from its duties or obligations  hereunder by giving
notice of its  resignation to the parties to this  Agreement,  specifying a date
not less than ten (10) days following such notice date of when such  resignation
will take  effect.  ISI will  designate  a successor  Escrow  Agent prior to the
expiration of such ten-day  period by giving  written notice to the Escrow Agent
and the  Representative.  ISI may appoint a successor  Escrow Agent  without the
consent of the Representative so long as such successor is a bank with assets of
at least Fifty (50) Million Dollars,  and may appoint any other successor Escrow
Agent with the  consent of the  Representative,  which will not be  unreasonably
withheld.  The Escrow Agent will  promptly  transfer  the Escrow  Shares to such
designated successor.

                10. LIMITATION OF RESPONSIBILITY.  The Escrow Agent's duties are
limited to those set forth in this Agreement,  and Escrow Agent,  acting as such
under  this  Agreement,  is not  charged  with  knowledge  of or any  duties  or
responsibilities  under any  other  document  or  agreement,  including  without
limitation   the  Plan.   Escrow   Agent  may  execute  any  of  its  powers  or
responsibilities  hereunder and exercise any rights hereunder either directly or
by or through its agents or attorneys. Nothing in this Escrow Agreement shall be
deemed to impose upon the Escrow  Agent any duty to qualify to do business or to
act as a fiduciary  or  otherwise  in any  jurisdiction  other than  California.
Escrow  Agent  shall  not be  responsible  for and  shall not be under a duty to
examine into or pass upon the validity, binding effect, execution or sufficiency
of this Escrow Agreement or of any agreement amendatory or supplemental hereto.

                11.  AMENDMENT.  This  Agreement  may be amended by the  written
agreement of ISI, the Escrow Agent and the Representative, provided that, if the
Escrow  Agent  does  not  agree  to an  amendment  agreed  upon  by ISI  and the
Representative,  the Escrow  Agent will resign and ISI will  appoint a successor
Escrow Agent in accordance  with Section 9 above. No amendment of the Plan shall
increase Escrow Agent's  responsibilities  or liability hereunder without Escrow
Agent's written agreement.

                                      -8-

<PAGE>


                12. HOLDERS' REPRESENTATIVE. For purposes of this Agreement, the
Holders  hereby  consent  to  the   appointment   of  the   Representative,   as
representative of the Holders,  and as the attorney-in-fact for and on behalf of
each Holder, and, subject to the express limitations set forth below, the taking
by the  Representative  of any and all actions  and the making of any  decisions
required  or  permitted  to be taken by him  under  this  Agreement,  including,
without  limitation,  the exercise of the power to (i) authorize delivery to ISI
of the Escrow Shares,  or any portion thereof,  in satisfaction of Claims,  (ii)
agree to,  negotiate,  enter into  settlements  and  compromises  of, and demand
arbitration  and comply  with  orders of courts and awards of  arbitrators  with
respect to such  Claims,  (iii)  resolve  any  Claims and (iv) take all  actions
necessary in the judgment of the  Representative  for the  accomplishment of the
foregoing  and  all of the  other  terms,  conditions  and  limitations  of this
Agreement.  The Representative will have unlimited authority and power to act on
behalf of each  Holder  with  respect  to this  Agreement  and the  disposition,
settlement or other handling of all Claims,  rights or obligations arising under
this  Agreement  so long as all  Holders  are  treated in the same  manner.  The
Holders will be bound by all actions taken by the  Representative  in connection
with this Agreement,  and ISI will be entitled to rely on any action or decision
of the Representative. In performing his functions hereunder, the Representative
will not be liable to the Holders in the absence of gross  negligence or willful
misconduct.  The Representative may resign from such position,  effective upon a
new representative  being appointed in writing by Holders who beneficially own a
majority  of the Escrow  Shares.  The  Representative  will not be  entitled  to
receive  any  compensation  from ISI or the  Holders  in  connection  with  this
Agreement.  Any  out-of-pocket  costs and  expenses  reasonably  incurred by the
Representative,  including  reasonable  expenses  of counsel  and other  experts
employed on behalf of the Holders in connection  with any actions taken pursuant
to the terms of this  Agreement  or to enforce the rights of the  Holders  under
this Agreement will be paid by the Holders to the  Representative  in proportion
to their  percentage  interests  in the  Escrow  Shares  set forth on  Exhibit A
through the release to the Representative of Escrow Shares equal in value to the
amount of such costs and expenses incurred.

                IN  WITNESS  WHEREOF,   the  parties  have  duly  executed  this
Agreement as of the day and year first above written.


INTEGRATED SYSTEMS, INC.                    REPRESENTATIVE


By:                                         By:
     ---------------------------------          --------------------------------
                                                    Marco J. Thompson
Its:
     ---------------------------------          --------------------------------



ESCROW AGENT                                HOLDERS

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


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

By:
     ---------------------------------          --------------------------------
      Authorized Signatory



                       SIGNATURE PAGE TO ESCROW AGREEMENT

                                      -9-


<PAGE>


HOLDERS

- ---------------------------------            ---------------------------------
Signature                                    Signature
- ---------------------------------            ---------------------------------
Printed Name                                 Printed Name


- ---------------------------------            ---------------------------------
Signature                                    Signature
- ---------------------------------            ---------------------------------
Printed Name                                 Printed Name


- ---------------------------------            ---------------------------------
Signature                                    Signature
- ---------------------------------            ---------------------------------
Printed Name                                 Printed Name


- ---------------------------------            ---------------------------------
Signature                                    Signature
- ---------------------------------            ---------------------------------
Printed Name                                 Printed Name


- ---------------------------------            ---------------------------------
Signature                                    Signature
- ---------------------------------            ---------------------------------
Printed Name                                 Printed Name


- ---------------------------------            ---------------------------------
Signature                                    Signature
- ---------------------------------            ---------------------------------
Printed Name                                 Printed Name

                       SIGNATURE PAGE TO ESCROW AGREEMENT


                                      -10-
<PAGE>


<TABLE>


                                    EXHIBIT A

<CAPTION>


             Holder                    DDI Shares        Total ISI Shares*       Escrow Shares
             ------                    ----------        -----------------       --------------
<S>                                    <C>                  <C>                     <C>
Thompson, Marco                        2,018,368            291,754                 29,175

Preuss, Peter                            137,500             20,434                  2,043

Hannan, Cecil and  Molly                 137,500             20,434                  2,043

Kriss, Richard                           125,000             18,576                  1,857

Gauthier, Catherin                        76,602             11,383                  1,138

Bradbury, Colin                           30,000              4,458                    445

Johnson, Steve                            15,000              2,229                    222

Teplitsky, Simon                           5,500                817                     81

Lowell, Robert                             5,000                743                     74

Yarnall, Ronald                            2,500                371                     37

(Ramsey), Lisa-Miller Klizner              2,500                371                     37

Allen, Sara                                  250                 37                      3
                                      ==========         ================        ==============

                                       2,555,720            371,607                 37,155
<FN>

* The share numbers in this column are net of  fractional  shares for which cash
is being paid.
</FN>
</TABLE>


<PAGE>




                           STOCK POWER AND ASSIGNMENT
                            SEPARATE FROM CERTIFICATE

         In connection with the merger of Dr. Design, Inc. ("DDI") with a wholly
owned subsidiary ("Sub") of Integrated Systems, Inc. ("ISI"), the undersigned is
receiving  shares of ISI  Common  Stock in  respect  of the shares of DDI Common
Stock held by the undersigned prior to the merger.

         FOR VALUE RECEIVED,  and pursuant to that certain Agreement and Plan of
Reorganization  dated as of December  14,  1995  between  DDI,  Sub and ISI (the
"Plan") and that certain Escrow Agreement dated as of December 14, 1995 executed
in connection  therewith (the  "Agreement"),  the undersigned hereby assigns and
transfers  unto  Chemical  Trust  Company of  California,  as Escrow  Agent (the
"Agent") pursuant to the Plan and the Agreement,  ________ shares (the "Shares")
of the Common Stock of ISI.

         The  undersigned  does  hereby  irrevocably  constitute  the Agent,  as
attorney-in-fact,  with full power of substitution and re-substitution,  to hold
such  Shares in escrow and to  transfer  such  shares on the books of ISI in the
event that all or a portion of the Shares are retained by ISI in accordance with
the Agreement in satisfaction of the undersigned's  indemnification  obligations
under the Plan. The undersigned hereby acknowledges that the Shares will be held
in escrow until  required to be released  pursuant to the Agreement and that the
number of Shares  released  from  escrow  will be equal to the  number of Shares
listed above less any amount  retained in satisfaction of Claims as set forth in
the Agreement.

Dated:  January __, 1996


HOLDER

- ---------------------------------
Signature

- ---------------------------------
Printed Name




[Medallion stamp bank guarantee of signature]

                                      -12-



<PAGE>

                                                                   EXHIBIT 4.19A

                       OFFICE BUILDING PURCHASE AGREEMENT

         0. Introduction and Definitions. Marco and Laura Thompson (collectively
"SELLER") own the real property  described in ATTACHMENT A and all improvements,
fixtures, window coverings, and all related rights (collectively the "PROPERTY")
and by this Agreement commit to sell the Property to Integrated Systems, Inc., a
California  corporation  ("BUYER"),  which by this Agreement commits to purchase
the Property,  all on the terms and conditions set forth below.  The Property is
encumbered  by a deed of trust in favor  of the  Small  Business  Administration
securing the repayment by Seller of approximately  four hundred thousand dollars
as well as by a deed of trust in favor of the Bank of America in the approximate
amount of four hundred thousand  dollars,  all pursuant to the documentation set
forth  in  ATTACHMENT  B  (the  "SBA  ENCUMBRANCE"  and  "B  OF A  ENCUMBRANCE",
respectively, and collectively the "LOAN ENCUMBRANCES"). Seller presently leases
the  Property to Dr.  Design,  Inc., a California  corporation  (the  "TENANT"),
pursuant to a lease  dated  January 1, 1989 (the  "LEASE").  Upon the closing of
this transaction,  Buyer will acquire the Property;  Buyer will pay off the Loan
Encumbrances;  and the Lease will be terminated.  This Agreement is entered into
as of January 15,  1996,  which is referred to as the  (effective)  date of this
Agreement below.

         1.  Transfer.  On the  closing,  Seller  will  convey  to Buyer  all of
Seller's  right,  title  and  interest  in the  Property  by grant  deed in form
acceptable to Buyer.

         2. Price.  In  consideration  of the transfer of the Property by Seller
upon closing,  Buyer will pay off the  outstanding  indebtedness  secured by the
Loan  Encumbrances.  The estimated pay off amount for the B of A Encumbrance  is
approximately  $371,000;  the  estimated  pay off for  the  SBA  Encumbrance  is
$424,406.87. No other form of payment will be due to Seller from Buyer or Tenant
in connection with the transfer.  Moreover, Seller will relinquish its rights to
such  number of shares  of stock in Buyer as set  forth in  Section  4.19 of the
Agreement and Plan of Reorganization dated December 14, 1995 (the "PLAN") in the
amount by which the total sums paid by Buyer to the  lenders in order to pay off
the Loan  Encumbrances  exceed the  recently  appraised  value of $515,000  (the
"PRICE").  (The MAI appraisal is Exhibit 4.19B to the Plan.) In consideration of
Seller's  acceptance of the Price at the lower end of range of appraised  values
(the  higher end being  $540,000),  Buyer  will  accept  the  Property  with the
physical   deficiencies  noted  in  Buyer's  inspection  report  and  listed  in
ATTACHMENT C, and Seller will have no obligation to correct such deficiencies or
pay any sum or to reduce the Price on account of such deficiencies.

         3.  Closing.  The parties have  established  an escrow for the closing.
Subject to the provisions of Paragraph 10 below,  the closing will take place on
January 26, 1996, at the offices of the escrow  holder;  provided that the date,
time and/or place of the closing may be changed by mutual agreement of Buyer and
Seller;  and provided  further that if any of the  conditions to the closing set
forth in Paragraph 6 below are not  satisfied or waived by such time,  the party
to be benefited by such unsatisfied  conditions shall have the right and option,
but not the  obligation,  to  extend  the date of the  Closing  until a  weekday
selected by such party that is no more than five days  following the  subsequent
satisfaction  or waiver of such  condition  so long as the closing of the merger
pursuant to the Plan is correspondingly delayed (the "DEADLINE").

         At the closing the following will occur:

                  a. Buyer will pay off the B of A  Encumbrance  and deposit the
estimated  pay off amount of the SBA  Encumbrance  into  escrow (or simply  take
title subject to the SBA Encumbrance)  pending receipt of the actual SBA pay off
demand, and the lenders will reconvey their respective interests in the Property
upon pay off.

                  b. Seller will convey marketable title to the Property subject
only to the  "PERMITTED  Exceptions"  as  defined in  Section  6(c)(4)  below by
executing and delivering the grant deed in form acceptable to Buyer and Seller.

                  c.  Seller  and  Tenant  will  execute  and  deliver  a  Lease
termination in form acceptable to Buyer and Seller.

<PAGE>

                  d.  Seller will commit to deliver all of the books and records
related to the Property and its  management  to Buyer not  previously  delivered
pursuant to Section  6(c)(6)  below within ten days after the closing;  provided
that for a period of at least  three years  following  the  closing,  Buyer will
retain the originals of, and provide Seller  reasonable access to, all books and
records so received.

                   e. Seller will refund to Tenant its  security  deposit in the
amount of $12,000 and a prorated amount of any rent and similar  charges,  which
have been paid in advance.

           The  following  costs  associated  with the closing  will be borne by
Seller: title insurance, recording fees, similar charges of the escrow holder or
recorder's  office and any transfer  taxes.  Buyer and Seller will equally share
the cost of escrow settlement and title charges.  Other costs of the transaction
will be borne by the respective  party incurring the charge,  such as attorneys'
or experts'  fees. All interest on funds in escrow will accrue to the benefit of
Buyer.

         4. Due  Diligence.  Prior to  closing,  Buyer  will  have the  right to
conduct any  investigation of the Property and related  information it considers
reasonable  and may authorize  third  parties to assist in this process.  Seller
will arrange access to the Property and  information as applicable on reasonable
notice.  Buyer will  restore the  Property to its  original  condition  within a
reasonable  amount of time in the event that this purchase  transaction does not
close.  Buyer will  indemnify,  defend and hold Seller harmless from any claims,
loss, expense,  or liability,  including  reasonable  attorneys' fees, caused by
Buyer's or such third parties' investigative activities at the Property.

         5.  Representations  and  Warranties.  Each of the  parties  makes  the
representations  and warranties set forth for it below,  hereby  certifying that
such representations and warranties are true and complete as of the date of this
Agreement and will be true and complete as of the closing, and acknowledges that
the other party will rely upon such  representations  and warranties in entering
into  and  undertaking  the  respective  obligations  of  this  Agreement.  Such
representations  and warranties will be true as of the closing and any claim for
breach of any representation or warranty must be brought upon the earlier of two
years after Buyer sells the Property or four years after the closing.

                    a.     Seller.   Seller represents and warrants that:

                              (1) Seller owns the Property free and clear of all
forms  of  claims,   encroachments   and  liens  of  third  parties,   including
governmental  agencies,  except the Permitted Exceptions,  and Seller and Tenant
have exclusive possessory rights to the Property prior to the Lease termination.
To Seller's knowledge, there have been no improvements to the Property performed
by third parties for which lien rights still exist.

                              (2) Seller  has the  requisite  authority  and has
obtained the consent of any third  parties  whose  consent is required to convey
title to the  Property to Buyer under the terms of this  Agreement  and to enter
into this  Agreement,  specifically  excepting the SBA. Seller is not a "foreign
person" within the meaning of 42 USC Section 1445(f)(3).

                              (3) Except for the Permitted Exceptions, Seller is
a not a party to or otherwise  bound by any agreements or litigation  imposing a
material obligation on or otherwise affecting the Property,  and the Property is
not  subject to any  pending  claims or  governmental  actions,  nor to Seller's
knowledge  subject to any other material  liabilities,  other than the Permitted
Exceptions  and as disclosed in Attachment C. Seller is not in default of any of
the contracts or agreements  referred to above,  including the SBA  Encumbrance.
Seller has entered into no brokerage  commitments with third parties  concerning
the Property.


                                      -2-
<PAGE>


                              (4) To Seller's  knowledge and except as set forth
in  Attachment C, the Property is in compliance  with all  applicable  laws with
respect to its operation,  use,  occupancy and environmental  conditions,  other
than laws with respect to handicap access,  about which Seller has no knowledge.
Environmental conditions include without limitation the presence of any material
considered  "hazardous"  such as asbestos,  PCB's and  petroleum  products at or
around the Property. There are no hazardous materials at or around the Property,
except for normal  quantities  of  materials  customarily  used in  offices.  To
Seller's  knowledge,  the building on the Property was constructed in accordance
with the final plans and specifications which complied with then applicable law.

                              (5)  There  exist no  conditions  on the  Property
which could result in the early termination of casualty and liability  insurance
coverage  on the  Property,  and Seller has  received no notice from any insurer
threatening early termination for any reason.

                              (6) (i) To Seller's knowledge, the improvements on
the Property are in good  condition  and its systems are in good working  order,
except as set forth in Attachment  C; (ii) there are not  presently  pending any
special  assessment  or  condemnation  proceedings  or street  alteration  plans
affecting the  Property;  (iii)  adequate  utility  facilities  and services are
lawfully in place for the  operation of the Property in its current  uses;  (iv)
the Property is not within a coastal zone under the California  Coastal Act or a
special  studies zone under the  Alquist-Priolo  Geologic Hazard Act; and (v) to
Seller's knowledge, Seller has disclosed all material information concerning the
Property to Buyer in a reasonably  complete  manner  pursuant to this Agreement.
Except for the express  representations and warranties set forth in this Section
5(a), Seller is selling the Property "as is" and in its current state of repair.

                              (7) The Agreement  and all  documents  executed by
Seller  which will be  delivered to Buyer at the closing are, or at closing will
be, legal,  valid and binding  obligations  of Seller and do not, or will not at
closing,  violate any  provisions  of any  agreement or judicial  order to which
Seller is a party or to which Seller is subject.


                  b.       Buyer.  Buyer represents and warrants that:

                              (1) It is duly organized and in goodstanding under
the laws of the state of  California  and has the requisite  authority,  and the
consent  of any third  parties  whose  consent is  required,  to enter into this
Agreement  and to  acquire  the  Property  under  the  terms of this  Agreement,
specifically  excluding  the  Small  Business  Administration  and  the  Bank of
America.

                              (2) All  requisite  action  of  Buyer's  Board  of
Directors  necessary to authorize and implement this  transaction  has been duly
taken.

                              (3)  Buyer  has not  entered  into  any  brokerage
commitments with third parties concerning the Property.

                              (4) The Agreement  and all  documents  executed by
Buyer which will be  delivered  to Seller at the closing are, or at closing will
be,  legal,  valid and binding  obligations  of Buyer and do not, or will not at
closing,  violate any  provisions  of any  agreement or judicial  order to which
Buyer is a party or to which Buyer is subject.

                     c. Indemnification.  Each party will indemnify,  defend and
 hold the other party  (including  such  party's  officers,  directors,  agents,
 employees attorneys and successors) harmless from all liability, loss or claim,
 including  attorneys'  and  experts'  fees and the  diminution  in value of the
 Property,  arising  from a  misrepresentation  or breach of warranty  set forth
 above.  In the event  Buyer  seeks a  recovery  from  Seller  pursuant  to this
 paragraph,  Buyer can elect to treat the claim as an additional  claim of Buyer
 which can be adjusted under the holdback  provisions of the Plan, in which case
 the number of shares due Seller would be correspondingly  reduced. In the event
 title insurance covers a claim, then Buyer will first look to the title insurer
 for  recovery.  A party  must  give  notice to the other of any claim for which
 indemnification  is expected pursuant to this paragraph prior to the expiration
 of the "Escrow Period", as such term is defined in Section 1.4 of the Plan.

                                      -3-

<PAGE>

     6.  Conditions.

           a.  Mutual.  The  respective  obligations  of the parties  hereto are
 mutually  conditioned  on  the  occurrence  (or  each  party's  waiver  of  the
 occurrence)  of  simultaneous  delivery  of all  items to be  delivered  at the
 closing  pursuant  to  Paragraph  3 above.  Moreover,  the  merger  of  Buyer's
 subsidiary and Tenant must be consummated  (subject only to non  discretionary,
 ministerial acts of third parties) pursuant to the Plan.

           b. Seller.  Seller's  obligations  under this  Agreement  are further
conditioned on the satisfaction of each of the following:

                  (1) All  representations  and  warranties  of Buyer under this
Agreement are true and complete.

                  (2) All  covenants  of  Buyer  to be  performed  prior  to the
closing have been performed.

           c.  Buyer.  Buyer's  obligations  under this  Agreement  are  further
conditioned on the satisfaction of each of the following:

                  (1) All  representations  and  warranties of Seller under this
Agreement are true and complete.

                  (2) All  covenants  of  Seller  to be  performed  prior to the
closing have been performed.

                  (3) The  Property  is in  substantially  the  same  condition,
 normal wear and tear  excepted,  as when Buyer  approved  its  condition as set
 forth in Section 6(c)(6) below; however, in the event of physical damage to the
 Property for which there is adequate insurance proceeds, Seller will assign the
 proceeds to Buyer, which will waive the related condition.

                  (4)  Buyer is  satisfied  with the  condition  of title to the
Property.  Seller has provided  Buyer with a copy of a preliminary  title report
dated January 10, 1996 issued by Southland Title Company together with copies of
all documents supporting any exceptions to title (the "REPORT").  By January 24,
1996,  Buyer will review and approve or disapprove  the Report and notify Seller
of any  objections to the condition of title.  Seller will correct the condition
of title to the  satisfaction of Buyer prior to closing.  Exceptions 1 through 6
of Exhibit B to the Report are "PERMITTED  EXCEPTIONS" to the condition of title
as well as any other  conditions  approved  by Buyer in writing and set forth in
Attachment C.  Exceptions  7,8, and 9 of Exhibit B to the Report will be removed
on or before  closing.  Buyer's  failure  to timely  notify  Seller of any other
objections  to the  condition  of title  will be  deemed an  acceptance  of such
condition of title.

                  (5)  On or  before  the  closing,  Buyer  will  have  received
evidence  that the Title  Company is prepared to issue a  California  Land Title
Association owner's policy of title insurance in the amount of the Price showing
title properly vested in Buyer subject only to the Permitted Exceptions.

                  (6) Buyer is satisfied  with the status of the Property  after
completion of its due diligence review,  including the physical condition of the
Property. Within five days after the date of this Agreement, Seller will provide
to Buyer copies of all written materials in Seller's possession or control which
address the  construction,  condition or use of the Property,  including without
limitation,  occupancy  certificates,  permits,  soil and  engineering  reports,
licenses, maintenance contracts, plans, specifications,  leases, correspondence,
governmental notices and brokerage commitments. Moreover, if Seller knows of the
existence of any written material not in its possession or control,  Seller will
notify Buyer of such  instances.  After receipt of all the material,  Buyer will
promptly  review such material,  physically  inspect the Property and approve or
disapprove  of the status of the  Property.  Buyer will approve or disapprove of
the status of the Property by January 24, 1996.

                                      -4-
<PAGE>

           d.  Failure of  Condition.  In the event of a failure of a condition,
 the aggrieved party can elect to extend  additional time for the other party to
 cure the failure (thereby  extending the Deadline) pursuant to Section 3 above,
 and  thereafter,  if  the  condition  remains  unsatisfied,  can  elect  either
 terminate  its  obligations  as set  forth in  Section  10  below or waive  the
 failure.  The waiver of a  condition  by one party will not  release  the other
 party from any other obligation of this Agreement, including those set forth in
 Section 5. In the event the lender  under the SBA  Encumbrance  does not timely
 place a pay off  demand  into  escrow in time to close  prior to the  Deadline,
 Buyer will acquire the Property  subject to such  remaining  debt (meaning that
 Exception 8 of Exhibit B of the Report will become a Permitted  Exception until
 pay off),  in which case the parties will continue to use good faith efforts to
 secure  such pay off demand  after the  closing  and Buyer will pay off the SBA
 Encumbrance when such necessary documents are in order.

           e. Closing.  Upon Buyer's  acceptance of Seller's  grant deed and the
 other deliveries and the tender by Seller of all payments  required pursuant to
 Section 3, Seller will be deemed to have performed all of Seller's  obligations
 under this Agreement,  except those continuing  obligations related to: (i) the
 representations  and warranties and related  indemnification  undertakings  set
 forth in Section 5; (ii) the  cooperation  obligations  as set forth in Section
 6(d); (iii) the  confidentiality  and consultation  obligations as set forth in
 Sections 8 and 9; (iv) the  miscellaneous  obligations  of Section  11; (v) the
 additional  undertakings  provided  for  in  the  Plan  and  the  Price  offset
 provisions of Section 2; and (vi) any supplemental undertakings made in writing
 in connection with the closing of this transaction.  Upon Buyer's tender of the
 pay off amounts for the Loan Encumbrances and acceptance of Seller's grant deed
 and the other  deliveries  pursuant  to Section 3, Buyer will be deemed to have
 performed all of its obligations under this Agreement,  except those continuing
 obligations of Buyer corresponding to those of Seller in items (i) through (vi)
 above.

       7.Operations  Through Closing.  Seller represents that Seller has managed
 the Property in the ordinary  course since December 14, 1995 and agrees through
 closing to continue to manage the Property in the ordinary course.

       8.Confidentiality.  The  parties,  unless  under  compulsory  process  or
 obligation  to disclose in connection  the  provisions  of the  Securities  and
 Exchange Act of 1934,  will maintain the  confidentiality  of the provisions of
 this agreement and all information  exchanged pursuant to it, and no party will
 issue a press release in connection with this proposed  transaction without the
 prior  consent of all other  parties.  This  covenant  will not limit a party's
 ability to share  relevant  information  with  professional  advisors,  such as
 attorneys  and  accountants,  and with any  lender  on the  Property,  however.
 Moreover,  and notwithstanding  any contrary provision of this Agreement,  this
 covenant  will  survive  any  termination  of this  Agreement.  Each party will
 promptly  return all  material  provided  by the other  party  pursuant to this
 Agreement,  in the event that this Agreement does not close. Neither party will
 record this Agreement.

       9. Consultation. After the closing, Seller will provide, at no charge, up
to five  days of  consultation  with  Buyer's  facilities  manager  to assist an
orderly transition of the management of the Property.

       10.  Termination.  This  Agreement  may be  terminated  (i) by the mutual
 agreement  of all parties or (ii) if any of the  conditions  to the closing set
 forth in  Paragraph  6 above are not  satisfied  and not  waived in  accordance
 herewith,  by any  party  to be  benefited  by such  unsatisfied  and  unwaived
 condition,  in which case the termination shall occur upon notice by such party
 to all  other  parties  or  (iii)  as  otherwise  provided  in the  Plan.  Upon
 termination  of this  Agreement,  all  parties  will be relieved of all further
 obligations  hereunder;  provided that any party whose breach of this Agreement
 resulted in such termination  shall not be relieved of any liability  resulting
 therefrom.  Sections  11,  10, 8 and 4 will  survive  the  termination  of this
 Agreement.


                                      -5-
<PAGE>


       11.  Miscellaneous.  This Agreement (and the Plan) constitutes the entire
 agreement  between the parties on the subject  matter of this Agreement and may
 be amended only by a written amendment signed by all parties. All references to
 the Agreement will include the provisions of the attachments to this Agreement.
 This  Agreement  will be governed  by  California  law as applied to  contracts
 entered into between  residents of  California.  The parties  acknowledge  that
 specific performance is an appropriate remedy for any breach of this Agreement.
 All  parties  will  bear  their  own  legal  expenses  in  connection  with the
 preparation of this Agreement and any  modifications to it and the effectuation
 of the  transactions  contemplated,  except  as set  forth in  Section  3. This
 Agreement may be signed in counterparts, all of which together shall constitute
 a single  agreement.  The  invalidity of any portion of this Agreement will not
 invalidate any other portion.  No waivers  permitted by this Agreement shall be
 implied by conduct,  and a waiver of one condition or breach will not be deemed
 to be a waiver of a subsequent  condition or breach.  Time is of the essence in
 this  Agreement.  In the event of any  inconsistency  between the provisions of
 this  Agreement and the  provisions of the Plan then the provisions of the Plan
 will supersede such provisions of this Agreement.  Neither party can assign its
 rights under this Agreement without the consent of the other party. All notices
 must be in  writing  and  delivered  to  Buyer  as set  forth  in the  Plan and
 delivered  to Seller  in care of Tenant as set forth in the Plan.  In the event
 either party must seek legal recourse to enforce or interpret  this  Agreement,
 then the prevailing  party will be entitled to recover  attorneys' and experts'
 fees in  addition  to such other  relief as the court may award.  Finally,  the
 parties agree to execute such other documents as may be necessary in the future
 in order to implement without additional risk or expense the provisions of this
 Agreement.

       12. Signatures.

Seller                                               Buyer

- -----------------------------               ----------------------------------
Marco Thompson                              Integrated Systems, Inc.


                                            By: 
- -----------------------------                   ------------------------------
Laura Thompson                                              President


                                      -6-
<PAGE>


                                                                    ATTACHMENT A

          See the attached legal description from page 3 of the Report.
                         ------------------------------
                                                                    ATTACHMENT B

                See the attached Loan Encumbrances documentation.
                          -----------------------------
                                                                    ATTACHMENT C

1.  Conditions to Seller's  representations  and warranties set forth in Section
5a(3): none.

2.  Conditions to Seller's  representations  and warranties set forth in Section
5a(6): see the attached pages from Buyer's physical inspection report.

         3. Other Permitted Exceptions pursuant to Section 6b(4): none.

                                      -7-
<PAGE>



                                LEASE TERMINATION

 The undersigned parties, Marco and Laura Thompson (collectively "Landlord") and
 Doctor Design, Inc. (a California corporation,  "Tenant"), entered into a lease
 dated January 1, 1989 for the improved  real  property  located at 5415 Oberlin
 Drive, San Diego, California (the "Lease").

 By this  agreement and effective only upon the closing of the Agreement for the
 sale of the real property by Landlord to Integrated Systems, Inc. (California),
 Landlord and Tenant terminate the Lease and release each other and the parties'
 respective officers, directors, employees, agents, shareholders, successors and
 assigns from liability under the Lease.

 In the event the Agreement  for sale of the real property does not close,  then
this agreement is null and void.



Landlord                                 Tenant

- -------------------------------          ---------------------------------
Marco Thompson                                   Doctor Design, Inc.

- -------------------------------          ---------------------------------
Laura Thompson                                    By: President



                                      -8-


<PAGE>

                                                                    EXHIBIT 8.14

                 NON-COMPETITION AND NON-SOLICITATION AGREEMENT

         THIS  NON-COMPETITION  AND  NON-SOLICITATION  AGREEMENT,  dated  as  of
December 14, 1995,  (the  "Non-Compete  Agreement") is entered into by and among
Dr. Design, Inc., a California corporation ("DDI"),  Integrated Systems, Inc., a
California  corporation ("ISI") and Marco J. Thompson, a majority shareholder of
DDI ("Thompson").


                              W I T N E S S E T H:

         WHEREAS,  DDI  has  its  principal  place  of  business  in San  Diego,
California and does business  throughout the United States and  internationally;
and

          WHEREAS,  ISI engages in the  business  of  consulting,  research  and
development of software products; and

         WHEREAS,  DDI and  ISI  have  entered  into an  Agreement  and  Plan of
Reorganization dated as of December 14, 1995 (the "Merger  Agreement"),  whereby
NewCo,  a wholly owned  subsidiary of ISI ("NewCo") will merge with and into DDI
and, pursuant to the Merger Agreement, the outstanding shares of Common Stock of
DDI will be converted into ISI Common Stock and ISI will assume the  outstanding
options to purchase shares of DDI Common Stock (the "DDI Options") in accordance
with the terms and conditions of the DDI Options, such that the DDI Options will
be exercisable for shares of ISI Common Stock (the "Merger"); and

         WHEREAS,  execution  and  delivery of this  Non-Compete  Agreement is a
condition to consummating the transactions  contemplated by the Merger Agreement
and the parties hereto  recognize and acknowledge the interest of DDI and ISI in
protecting the business and goodwill associated with DDI following the Merger.

         NOW, THEREFORE,  in consideration of the foregoing,  and for other good
and  valuable  consideration,  the  receipt and  sufficiency  of which is hereby
acknowledged, the parties hereto agree as follows:

         1. Capitalized  terms not otherwise  defined herein shall have the same
meaning as in the Merger  Agreement as it may be amended and restated  from time
to time.

         2. As of the Closing,  Thompson agrees that,  without the prior written
consent of ISI and DDI,  Thompson will not at any time within the three (3) year
period  immediately  following  the  Closing  of  the  Merger  (the  "Restricted
Period"), directly or indirectly,  within the State of California,  elsewhere in
the United States or anywhere else in the world  (collectively  the "Territory")
whether or not for  compensation,  engage in or provide services to any business
that is competitive with or detrimental to any present or contemplated  business
of  DDI  and  its  subsidiaries  in  any  geographic  area  where  DDI  and  its
subsidiaries   engage  in  their   business   or   maintain   sales  or  service
representatives  or employees.  Thompson also agrees that, during the Restricted
Period, he shall not in any manner attempt to induce or assist others to attempt
to induce any customer or client of DDI and its  subsidiaries  to terminate his,
her or its association with DDI and its  subsidiaries,  nor do anything directly
or  indirectly  to  interfere  with  the   relationship   between  DDI  and  its
subsidiaries and any such persons or concerns.  Each of the following activities
shall,  without limitation,  be deemed to constitute engaging in business within
the  meaning of this  Section 2: to engage in,  work with,  have an  interest or
concern in, advise,  lend money to,  guarantee the debts or  obligations  of, or
permit  one's  name or any  party  thereof  to be used in  connection  with,  an
enterprise or endeavor, either individually,  in partnership,  or in conjunction
with any person or persons,  firms,  associations,  companies,  or corporations,
whether  as  a  principal,  agent,  shareholder,  employee,  officer,  director,
partner,  consultant or in any other manner whatsoever;  provided, however, that
Thompson  shall  retain the right to invest in or have an  interest  in entities
traded on any public market or offered by any national brokerage house, provided
that said  interest  does not exceed one percent  (1%) of the voting  control of
said entity.  In addition,  Thompson may make passive  investments  in privately
held  entities  that are  determined  by the Board of Directors of DDI not to be
competitors of DDI or its subsidiaries.

<PAGE>

         3.  Notwithstanding  any other provision hereof,  DDI, ISI and Thompson
agree that for a period of three (3) years immediately following consummation of
the Merger he will treat as confidential  and not use for his own benefit or the
benefit of any third party all non-public  information concerning ISI's or DDI's
records, assets, books, contracts,  customer and supplier lists, commitments and
affairs including, but not limited to, information regarding accounts, finances,
strategies,  marketing,  customers and potential  customers  (their  identities,
preferences,  likes and dislikes),  drawings,  plans,  reports,  data, notes and
related  information  pertaining  to or used in the  manufacture,  production or
marketing  of the  products  and  other  information  of a  similar  nature  not
available to the public. If this Agreement is terminated,  Thompson shall return
such documents and any electronic  storage media  containing such information as
shall reasonably be requested by DDI or ISI.

         4. Thompson shall not, during the term of this  Non-Compete  Agreement,
solicit,  directly  or  indirectly,  any  employee  or  customer  of DDI and its
subsidiaries  to leave the employ of DDI or its  subsidiaries  or any  affiliate
thereof.

         5. No rights under this  Non-Compete  Agreement shall be assignable nor
duties  delegable by any party,  except that ISI and DDI may assign any of their
rights hereunder to a purchaser of all or  substantially  all of its assets or a
majority of the outstanding  securities  ("Transferees").  Nothing  contained in
this  Agreement is intended to confer upon any person or entity,  other than the
parties  hereto,  their  successors in interest and permitted  Transferees,  any
rights or remedies  under or by reason of this  Agreement  unless  expressly  so
stated to the contrary.

         6. This  Agreement  shall be construed and enforced in accordance  with
the  laws of the  State  of  California  excluding  that  body of law  known  as
conflicts of law.

         7. It is the  intention of the parties  hereto that the  provisions  of
this Non-Compete  Agreement shall be enforced to the fullest extent  permissible
under all applicable laws and public policies,  but that the unenforceability or
the  modification  to conform with such laws or public policies of any provision
hereof  shall  not  render   unenforceable  or  impair  the  remainder  of  this
Non-Compete  Agreement.  The  covenants  in Section 2 herein with respect to the
Territory  shall be deemed to be separate  covenants with respect to each of the
states in the United  States and countries in the Territory and should any court
of competent  jurisdiction  conclude or find that this Non-Compete  Agreement or
any portion  thereof is not  enforceable  with respect to any one or more of the
states or countries,  respectively,  such  conclusion or finding shall in no way
render invalid or  unenforceable  the covenants herein with respect to the other
portions of the Territory.  Accordingly, if any provision shall be determined to
be  invalid  or  unenforceable  either  in whole or in  part,  this  Non-Compete
Agreement shall be deemed amended to delete, or modify as necessary, the invalid
or unenforceable  provisions to alter the balance of this Non-Compete  Agreement
in order to render the same valid and enforceable.

         8.  Thompson  acknowledges  that ISI  would  not have  entered  into or
consummated the Merger pursuant to the Merger  Agreement unless DDI and Thompson
had, among other things, entered into this Non-Compete Agreement.  Any breach of
this  Non-Compete  Agreement will result in irreparable  damage to ISI for which
ISI  will  not  have an  adequate  remedy  at  law.  Thompson  and  DDI  further
acknowledge  that ISI shall be entitled to injunctive  relief  hereunder and the
parties hereby consent to an injunction in favor of ISI without bond,  enjoining
any  breach  of any of the  foregoing  by any court of  competent  jurisdiction,
without prejudice to any other right or remedy to which ISI may be entitled.

         9. If an action is instituted to enforce any of the  provisions of this
Non-Compete Agreement,  the prevailing party in such action shall be entitled to
recover from the other party its or his reasonable attorneys' fees and costs.

         10.  This  Non-Compete  Agreement  may  be  executed  in  one  or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same agreement.


                                      -2-
<PAGE>



         11. Thompson, DDI and ISI shall submit to mandatory binding arbitration
in any  controversy  or claim arising out of, or relating to, this  Agreement or
any breach hereof in Santa Clara  County,  California,  in  accordance  with the
commercial  arbitration  rules of the American  Arbitration  Association then in
effect,  provided,  however,  that ISI  retains  its rights to, and shall not be
prohibited,  limited or in any other way restricted  from,  seeking or obtaining
equitable relief from a court having jurisdiction over the parties.

         12. This Non-Compete Agreement,  together with the Merger Agreement and
the Nondisclosure Agreement that are a part thereof,  constitutes the entire and
only  agreement   between  the  parties   concerning  the   noncompetition   and
nonsolicitation  obligations of DDI and Thompson, and supersedes and cancels any
and  all  previous  contracts,  arrangements  and  understandings  with  respect
thereto.

         IN WITNESS  WHEREOF,  the parties  hereto have caused this  Non-Compete
Agreement to be executed as of the date first above written.


Marco J. Thompson



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




Dr. Design, Inc.


By:
    ----------------------------------

Its:
    ----------------------------------




Integrated Systems, Inc.


By:
    ----------------------------------

Its:
    ----------------------------------





[SIGNATURE PAGE TO NON-COMPETITION AND NON-SOLICITATION AGREEMENT]

                                      -3-

<PAGE>

                                                                    EXHIBIT 8.15

                              EMPLOYMENT AGREEMENT


                  This Employment Agreement (the "Agreement") is entered into as
of January 26, 1996 (the  "Effective  Date") by and among Dr.  Design,  Inc.,  a
California  corporation,  with its  principal  offices  located at 5415  Oberlin
Drive,  San  Diego,  California  92121  ("DDI"),  Integrated  Systems,  Inc.,  a
California  corporation,  with its principal offices located at 3260 Jay Street,
Santa Clara,  California 95054 ("ISI"), and Marco J. Thompson, a resident of San
Diego, California ("Thompson").

                  In  consideration of the promises and the terms and conditions
set forth in this Agreement, the parties agree as follows:

                  1.  POSITION.  During the term of this  Agreement,  ISI or DDI
will  employ  Thompson,  and  Thompson  will serve ISI or DDI and will have such
responsibilities  and authority as may from time to time be assigned to Thompson
by the Board of Directors of ISI or DDI.

                  2. DUTIES. Thompson will serve DDI in such capacities and with
such duties and  responsibilities as the Board of Directors of DDI may from time
to time  determine.  Thompson  will comply with and be bound by DDI's  operating
policies,  procedures,  and  practices  from  time  to  time  in  effect  during
Thompson's employment.  Thompson will perform his duties under this Agreement at
the offices of DDI.  Thompson hereby  represents and warrants that he is free to
enter into and fully  perform  this  Agreement  and the  agreements  referred to
herein  without breach of any agreement or contract to which he is a party or by
which he is bound.

                  3. EXCLUSIVE  SERVICE.  Thompson will devote his full time and
efforts exclusively to this employment and apply all his skill and experience to
the  performance of his duties and advancing  DDI's interests in accordance with
Thompson's  experience and skills. In addition,  Thompson will not engage in any
outside consulting activity except with the prior written approval of DDI, or at
the direction of DDI, and Thompson will otherwise do nothing  inconsistent  with
the performance of his duties hereunder.  Notwithstanding the forgoing, Thompson
shall be  permitted to serve as a member of the Board of Directors of public and
private  companies,  subject to the prior  written  approval of the DDI Board of
Directors, not to be unreasonably withheld.

                  4. TERM OF  AGREEMENT.  This  Agreement  will  commence on the
Effective Date, and will continue until the earlier of (i) three (3) years after
the Effective Date or (ii) when terminated pursuant to Section 7 hereof.

                  5.       COMPENSATION AND BENEFITS.

                           5.1 BASE  SALARY AND BONUS.  ISI or DDI agrees to pay
Thompson a base salary that is commensurate with a position of this nature.  The
initial base salary shall be One Hundred Fifty Thousand Dollars ($150,000) on an
annualized basis earned in accordance with DDI's customary payroll practice.  In
addition,  the target bonus shall be One Hundred  Twenty-five  Thousand  Dollars
($125,000)  (the "Target  Bonus  Amount")  payable upon  achievement  of certain
agreed upon goals.

                           5.2 ADDITIONAL BENEFITS. Thompson will be eligible to
participate in DDI's employee  benefit plans of general  application,  including
without  limitation those plans covering  pension and profit sharing,  executive
bonuses, stock purchases,  stock options, and those plans covering life, health,
and dental  insurance in accordance  with the rules  established  for individual
participation  in any such plan and applicable  law.  Thompson will receive such
other benefits,  including  vacation,  holidays and sick leave, as DDI generally
provides to its employees.


<PAGE>

                           5.3  EXPENSES.  DDI will  reimburse  Thompson for all
reasonable and necessary  expenses incurred by Thompson in connection with DDI's
business,  are in accordance with the DDI's  applicable  policy and are properly
documented and accounted for in accordance with the requirements of the Internal
Revenue Service.

                  6.  PROPRIETARY  RIGHTS AND  CONFIDENTIALITY.  Thompson hereby
agrees to execute an Employee Invention Assignment and Confidentiality Agreement
with DDI in substantially the form attached hereto as Exhibit A.

                  7.       TERMINATION.

                           7.1 EVENTS OF TERMINATION. Thompson's employment with
DDI shall  terminate  upon  DDI's  determination  made in good  faith that it is
terminating   Thompson   for  "cause"  as  defined   under   Section  7.2  below
("Termination for Cause").

                           7.2 "CAUSE" DEFINED.  For purposes of this Agreement,
"cause" for Thompson's termination will exist at any time after the happening of
one or more of the following events:

                                    (a)   Thompson's    performance   does   not
reasonably  satisfy  performance goals that are mutually agreed upon by Thompson
and DDI,  provided  such  nonsatisfaction  is due to factors  within  Thompson's
control;

                                    (b) unprofessional, unethical, fraudulent or
unlawful  conduct or conduct that  materially  discredits  DDI or is  materially
detrimental to the reputation, character or standing of DDI;

                                    (c) Thompson's  material breach of a term of
this  Agreement  or  the  Employee  Invention   Assignment  and  Confidentiality
Agreement; or

                                    (d)     Thompson's death.

                  8. EFFECT OF TERMINATION,  TERMINATION FOR CAUSE. In the event
of any  termination  of this  Agreement  pursuant to Section  7.1, DDI shall pay
Thompson the  compensation  and  benefits  otherwise  payable to Thompson  under
Section 5, through the date of termination  set forth in the notice.  Thompson's
rights under DDI's  benefit  plans of general  application  shall be  determined
under the provisions of those plans.

                  9.  EMPLOYEE  SOLICITATION.  For three (3) years from the date
hereof,  Thompson shall not,  directly or indirectly,  either for himself or for
any other person or entity,  directly or indirectly,  solicit, induce or attempt
to induce any employee of ISI and its  subsidiaries  or DDI to terminate  his or
her employment with ISI and its subsidiaries or DDI, respectively.

                  10.      MISCELLANEOUS.

                           10.1 DISPUTE RESOLUTION.  All disputes arising out of
or relating to this Agreement shall be finally decided by the California  courts
having jurisdiction over labor and social matters.

                                      -2-

<PAGE>


                           10.2 SEVERABILITY. If any provision of this Agreement
shall be found by any  arbitrator  or  court  of  competent  jurisdiction  to be
invalid or  unenforceable,  then the parties  hereby waive such provision to the
extent that it is found to be invalid or unenforceable and to the extent that to
do so would not  deprive one of the  parties of the  substantial  benefit of its
bargain.  Such provision shall, to the extent allowable by law and the preceding
sentence, be modified by such arbitrator or court so that it becomes enforceable
and, as modified, shall be enforced as any other provision hereof, all the other
provisions continuing in full force and effect.

                           10.3 REMEDIES. DDI, ISI and Thompson acknowledge that
the  service  to be  provided  by  Thompson  is of a special,  unique,  unusual,
extraordinary  and  intellectual  character,  which gives it peculiar value, the
loss of which cannot be reasonably or  adequately  compensated  in damages in an
action at law.  Accordingly,  Thompson  hereby  consents and agrees that for any
breach or  violation  by Thompson  of any of the  provisions  of this  Agreement
(including, without limitation, Sections 3, 6 and 9), a restraining order and/or
injunction may be issued against  Thompson,  in addition to any other rights and
remedies DDI or ISI and its subsidiaries  may have, at law or equity,  including
without limitation the recovery of money damages.

                           10.4 NO WAIVER.  The  failure by either  party at any
time to require performance or compliance by the other of any of its obligations
or agreements  shall in no way affect the right to require such  performance  or
compliance at any time thereafter. The waiver by either party of a breach of any
provision  hereof shall not be taken or held to be a waiver of any  preceding or
succeeding  breach of such provision or as a waiver of the provision  itself. No
waiver of any kind shall be effective or binding, unless it is in writing and is
signed by the party against whom such waiver is sought to be enforced.

                           10.5  ASSIGNMENT.   This  Agreement  and  all  rights
hereunder  are  personal to Thompson and may not be  transferred  or assigned by
Thompson  at any time.  Any  attempt by Thompson to do so will be void and of no
effect.  ISI and DDI may assign their rights,  together  with their  obligations
hereunder, to any parent,  subsidiary,  affiliate or successor, or in connection
with any sale,  transfer or other  disposition  of all or  substantially  all of
their business and assets,  provided,  however,  that any such assignee  assumes
ISI's or DDI's obligations hereunder.

                           10.6  WITHHOLDING.   All  sums  payable  to  Thompson
hereunder shall be reduced by all federal,  state,  local and other  withholding
and similar taxes and payments required by applicable law.

                           10.7 ENTIRE AGREEMENT. This Agreement constitutes the
entire and only agreement between the parties relating to employment of Thompson
with DDI and the noncompetition and nonsolicitation obligations of Thompson, and
this  Agreement   supersedes  and  cancels  any  and  all  previous   contracts,
arrangements or understandings with respect thereto.

                           10.8  AMENDMENT.   This  Agreement  may  be  amended,
modified,  superseded,  canceled,  renewed or extended  only by an  agreement in
writing executed by all parties hereto.

                           10.9  NOTICES.  All notices and other  communications
required  or  permitted  under  this  Agreement  shall  be in  writing  and hand
delivered,  sent by telecopier,  sent by registered mail,  postage pre-paid,  or
sent by nationally  recognized  express courier service.  Such notices and other
communications  shall be  effective  upon  receipt if hand  delivered or sent by
telecopier,  five (5) days after mailing if sent by mail,  and one (l) day after
dispatch if sent by express courier, to the following  addresses,  or such other
addresses as any party shall notify the other parties:

                                      -3-
<PAGE>



                  If to DDI:                         Dr. Design, Inc.
                                                     5415 Oberlin Drive
                                                     San Diego, CA  92121
                  Telecopier:                        (619)  457-1168
                  Attention:                         President


                  If to ISI:                         Integrated Systems, Inc.
                                                     3260 Jay Street
                                                     Santa Clara, CA  95054
                  Telecopier:                        408-986-9946
                  Attention:                         Steven Sipowicz, CFO


                     If to Thompson:                 Marco J. Thompson
                                                     5415 Oberlin Drive
                                                     San Diego, CA  92121
                  Telecopier:                        (619)  457-1168
                  Attention:                         Marco J. Thompson

                           10.10 BINDING NATURE. This Agreement shall be binding
upon, and inure to the benefit of, the  successors and personal  representatives
of the respective parties hereto.

                           10.11  HEADINGS.   The  headings  contained  in  this
Agreement are for reference purposes only and shall in no way affect the meaning
or  interpretation of this Agreement.  In this Agreement,  the singular includes
the plural, the plural included the singular, the masculine gender includes both
male and female referents, and the word "or" is used in the inclusive sense.

                           10.12 COUNTERPARTS. This Agreement may be executed in
two or more  counterparts,  each of which shall be deemed to be an original  but
all of which, taken together, constitute one and the same agreement.

                           10.13  GOVERNING  LAW. This  Agreement and the rights
and  obligations of the parties hereto shall be construed in accordance with the
laws of California, without giving effect to the principles of conflict of laws.

IN WITNESS WHEREOF, ISI, DDI and Thompson have executed this Agreement as of the
date first above written.


"THOMPSON"


- -----------------------------------
MARCO J. THOMPSON



                                      -4-
<PAGE>


"DDI"

 DR. DESIGN, INC.


By:
    ---------------------------------

Its:
    ---------------------------------


"ISI"

INTEGRATED SYSTEMS, INC.

By:
    ---------------------------------

Its:
    ---------------------------------


                    [SIGNATURE PAGE TO EMPLOYMENT AGREEMENT]

                                      -5-
<PAGE>


                                                                       EXHIBIT A

           EMPLOYEE INVENTION ASSIGNMENT AND CONFIDENTIALITY AGREEMENT

                  This  Assignment  Agreement  (this  "Agreement")  is made  and
entered into effective as of December __, 1995 by and between Dr. Design,  Inc.,
a California corporation ("DDI") and Marco J. Thompson ("Thompson").

                                 R E C I T A L S

                  A.       Thompson is a shareholder and founder of DDI.

                  B.  Thompson  believes it is in the best  interests  of DDI to
merge  DDI with a  wholly  owned  subsidiary  of  Integrated  Systems,  Inc.,  a
California  corporation ("ISI") resulting in DDI being a wholly owned subsidiary
of ISI (the  "Merger").  Thompson  acknowledges  that ISI would not have entered
into or consummated the Merger unless Thompson entered into this Agreement.


                NOW THEREFORE,  Thompson  hereby  represents to, and agrees with
DDI as follows:

             1.  PURPOSE OF  AGREEMENT.  I  understand  that DDI is engaged in a
continuous  program  of  research,  development,  production  and  marketing  in
connection  with its  business  and that it is critical  for DDI to preserve and
protect its Proprietary Information (as defined below), its rights in Inventions
and in all related intellectual property rights. Accordingly, I am entering into
this  Agreement as a condition of my  employment  with DDI,  whether or not I am
expected to create inventions of value for DDI.

             2. DISCLOSURE OF INVENTIONS. I will promptly disclose in confidence
to DDI all  inventions,  improvements,  designs,  original  works of authorship,
formulas,  processes,   compositions  of  matter,  computer  software  programs,
databases,  mask works and trade secrets  ("INVENTIONS") that I make or conceive
or first  reduce to practice or create,  either  alone or jointly  with  others,
during  the  period  of my  employment,  whether  or  not in  the  course  of my
employment, and whether or not such Inventions are patentable,  copyrightable or
protectible as trade secrets.

             3. WORK FOR HIRE; ASSIGNMENT OF INVENTIONS. I acknowledge and agree
that any  copyrightable  works  prepared by me within the scope of my employment
are "works for hire" under the Copyright Act and that DDI will be considered the
author and owner of such  copyrightable  works. I agree that all Inventions that
(a) are developed using equipment, supplies, facilities or trade secrets of DDI,
(b) result from work performed by me for DDI, or (c) relate to DDI's business or
current or anticipated research and development,  will be the sole and exclusive
property of DDI and are hereby irrevocably assigned by me to DDI.

             4. LABOR CODE 2870 NOTICE. I have been notified and understand that
the  provisions  of  paragraphs  3 and 5 of this  Agreement  do not apply to any
Invention  that  qualifies  fully under the  provisions  of Section  2870 of the
California Labor Code, which states as follows:


                                      -6-
<PAGE>



             ANY PROVISION IN AN  EMPLOYMENT  AGREEMENT  WHICH  PROVIDES THAT AN
EMPLOYEE  SHALL  ASSIGN,  OR OFFER TO  ASSIGN,  ANY OF HIS OR HER  RIGHTS  IN AN
INVENTION TO HIS OR HER EMPLOYER  SHALL NOT APPLY TO AN INVENTION  THAT EMPLOYEE
DEVELOPED  ENTIRELY  ON  HIS  OR HER  OWN  TIME  WITHOUT  USING  THE  EMPLOYER'S
EQUIPMENT,  SUPPLIES,  FACILITIES,  OR TRADE SECRET INFORMATION EXCEPT FOR THOSE
INVENTIONS  THAT EITHER:  (1) RELATE AT THE TIME OF  CONCEPTION  OR REDUCTION TO
PRACTICE  OF  THE  INVENTION  TO  THE  EMPLOYER'S   BUSINESS,   OR  ACTUALLY  OR
DEMONSTRABLY  ANTICIPATED RESEARCH OR DEVELOPMENT OF THE EMPLOYER, OR (2) RESULT
FROM ANY WORK PERFORMED BY EMPLOYEE FOR THE EMPLOYER.  TO THE EXTENT A PROVISION
IN AN  EMPLOYMENT  AGREEMENT  PURPORTS  TO  REQUIRE  AN  EMPLOYEE  TO  ASSIGN AN
INVENTION OTHERWISE EXCLUDED FROM BEING REQUIRED TO BE ASSIGNED UNDER CALIFORNIA
LABOR CODE SECTION  2870(a),  THE PROVISION IS AGAINST THE PUBLIC POLICY OF THIS
STATE AND IS UNENFORCEABLE.

             5.  ASSIGNMENT  OF  OTHER  RIGHTS.  In  addition  to the  foregoing
assignment  of Inventions  to DDI, I hereby  irrevocably  transfer and assign to
DDI: (a) all worldwide patents,  patent  applications,  copyrights,  mask works,
trade secrets and other intellectual  property rights in any Invention;  and (b)
any and all "Moral Rights" (as defined below) that I may have in or with respect
to any Invention.  I also hereby forever waive and agree never to assert any and
all Moral  Rights I may have in or with  respect  to any  Invention,  even after
termination of my work on behalf of DDI. "MORAL RIGHTS" mean any rights to claim
authorship  of an  Invention,  to object to or prevent the  modification  of any
Invention,  or to  withdraw  from  circulation  or control  the  publication  or
distribution of any Invention, and any similar right, existing under judicial or
statutory  law of any country in the world,  or under any treaty,  regardless of
whether or not such right is  denominated  or generally  referred to as a "moral
right".

             6. ASSISTANCE.  I agree to assist DDI in every proper way to obtain
for DDI and enforce patents,  copyrights,  mask work rights, trade secret rights
and other legal  protections  for DDI's  Inventions in any and all countries.  I
will execute any documents that DDI may reasonably  request for use in obtaining
or enforcing such patents, copyrights, mask work rights, trade secrets and other
legal protections.  My obligations under this paragraph will continue beyond the
termination of my employment with DDI, provided that DDI will compensate me at a
reasonable rate after such termination for time or expenses actually spent by me
at ISI's  request  on such  assistance.  I appoint  the  Secretary  of DDI as my
attorney-in-fact to execute documents on my behalf for this purpose,  subject to
ISI paying me a commercially reasonable rate for my services only while I am not
employed with DDI or ISI.

             7. PROPRIETARY INFORMATION.  I understand that my employment by DDI
creates a relationship  of confidence and trust with respect to any  information
of a  confidential  or secret  nature  that may be  disclosed  to me by DDI that
relates to the  business of DDI or to the  business  of any parent,  subsidiary,
affiliate,  customer  or supplier of DDI or any other party with whom DDI agrees
to hold  information  of such party in confidence  ("PROPRIETARY  INFORMATION").
Such  Proprietary  Information  includes  but  is  not  limited  to  Inventions,
marketing plans,  product plans,  business  strategies,  financial  information,
forecasts, personnel information and customer lists.

             8.  CONFIDENTIALITY.  At all times,  both during my employment  and
after its termination,  I will keep and hold all such Proprietary Information in
strict  confidence  and  trust,  and I will  not  use or  disclose  any of  such
Proprietary  Information without the prior written consent of DDI, except as may
be  necessary to perform my duties as an employee of DDI for the benefit of DDI.
Upon  termination of my employment with DDI, I will promptly  deliver to DDI all
documents and materials of any nature  pertaining to my work with DDI and I will
not take with me any  documents or materials or copies  thereof  containing  any
Proprietary Information.
             9. NO BREACH OF PRIOR AGREEMENT. I represent that my performance of
all the terms of this  Agreement  and my duties as an  employee  of DDI will not
breach any invention  assignment, 

                                      -7-

<PAGE>

proprietary  information or similar  agreement with any former employer or other
party.  I  represent  that  I  will  not  bring  with  me to  DDI  or use in the
performance of my duties for DDI any documents or materials of a former employer
that  are not  generally  available  to the  public  or have  not  been  legally
transferred to DDI.

             10. DUTY NOT TO COMPETE.  I understand  that my employment with DDI
requires my undivided attention and effort. As a result, during my employment, I
will not,  without DDI's express  written  consent,  engage in any employment or
business  other than for DDI, or invest in or assist in any manner any  business
which directly or indirectly competes with the business or future business plans
of DDI.
             11.  NOTIFICATION.  I hereby  authorize  DDI to notify my actual or
future employers of the terms of
this Agreement and my responsibilities hereunder.

             12.  NON-SOLICITATION.  During,  and for a  period  of one (1) year
after  termination of, my employment with DDI, I will not directly or indirectly
solicit or take away suppliers,  customers,  employees or consultants of DDI for
my own benefit or for the benefit of any other party.

             13. NAME & LIKENESS  RIGHTS,  ETC. I hereby  authorize  DDI to use,
reuse,  and to grant  others  the right to use and reuse,  my name,  photograph,
likeness (including caricature),  voice, and biographical  information,  and any
reproduction  or  simulation  thereof,  in any  media  now  known  or  hereafter
developed  (including  but not  limited  to film,  video  and  digital  or other
electronic  media),  during  my  employment,  for  whatever  purposes  DDI deems
necessary.

             14.  INJUNCTIVE  RELIEF. I understand that in the event of a breach
or threatened breach of this Agreement by me DDI may suffer irreparable harm and
will therefore be entitled to injunctive relief to enforce this Agreement.

             15.  GOVERNING LAW;  SEVERABILITY.  This Agreement will be governed
and interpreted in accordance with the internal laws of the State of California,
without regard to or  application  of choice of law rules or principles.  In the
event that any  provision of this  Agreement is found by a court,  arbitrator or
other  tribunal to be illegal,  invalid or  unenforceable,  then such  provision
shall not be voided,  but shall be enforced to the  maximum  extent  permissible
under  applicable  law, and the remainder of this Agreement shall remain in full
force and effect.

             16. NO DUTY TO EMPLOY; "AT WILL" EMPLOYMENT. I understand that this
Agreement does not constitute a contract of employment or obligate DDI to employ
me for any stated period of time. I understand  that I am an "at will"  employee
of DDI and that my employment  can be terminated at any time,  for any reason or
for no reason, by either DDI or myself except as otherwise  specifically  stated
in a separately executed employment agreement. This Agreement shall be effective
as of the first day of my employment by DDI, namely:
July 22, 1985.

DDI:                                              THOMPSON:

By:
    -------------------------------               ------------------------------
                                                  Marco J. Thompson
Name:
     ------------------------------

Title:
      -----------------------------



                     SIGNATURE PAGE TO EMPLOYMENT AGREEMENT

                                      -8-
<PAGE>

                AMENDMENT TO AGREEMENT AND PLAN OF REORGANIZATION

         This  Amendment  shall amend the Agreement and Plan of  Reorganization,
dated  December  14, 1995 by and among  Integrated  Systems,  Inc., a California
corporation  ("ISI"), ISI Purchasing  Corporation,  a Delaware corporation and a
wholly owned  subsidiary  of ISI ("Newco")  and Dr.  Design,  Inc., a California
corporation ("DDI") (the "Agreement").

         1.  AMENDED  PROVISIONS.  Notwithstanding  any other  provision  of the
above-referenced  Agreement to the contrary,  the parties  hereby agree to amend
Sections 4.19 and 8.22 of the Agreement to read as follows:

         SECTION  4.19  SHALL BE  AMENDED  IN ITS  ENTIRETY  TO READ AS  FOLLOWS
(CHANGED TEXT IS IN ITALICS):

         "4.19 Assumption of Loan for Office Building. ISI shall assume the loan
         obligations  of  Marco  and  Laura  Thompson  under  a  Small  Business
         Administration  Loan dated April 10, 1989 and the Promissory  Note with
         the Bank of America dated December 28, 1988 (collectively, the "Loans")
         in conjunction  with the assignment of ownership of the Office Building
         E, located at 5415 Oberlin Drive,  San Diego,  California  (the "Office
         Building")  by Marco and Laura  Thompson to ISI  pursuant to the Office
         Building  Purchase  Agreement  by and  between  ISI and Marco and Laura
         Thompson,  attached  hereto as  Exhibit  4.19A  (the  "Office  Building
         Purchase  Agreement").  The Lease dated January 1, 1989 between DDI and
         Marco  and  Laura   Thompson   (the   "Lease")   shall  be   terminated
         simultaneously  with the  execution  of the  Office  Building  Purchase
         Agreement. Marco and Laura Thompson agree to relinquish their rights to
         such number of shares of ISI Common  Stock  issued to them  pursuant to
         Section 1.1.1 hereof equal in value,  as determined in accordance  with
         Section 1.1.1 hereof, to the amount by which the outstanding balance of
         the Loans exceeds the fair market value of the Office  Building,  which
         fair market value is determined  pursuant to the appraisal  provided by
         an "MIA"  certified  appraiser,  which is  attached  hereto as  Exhibit
         4.19B."

         SECTION  8.22  SHALL BE  AMENDED  IN ITS  ENTIRETY  TO READ AS  FOLLOWS
(CHANGED TEXT IS IN ITALICS):

         "8.22 Office Building.  Marco and Laura Thompson shall have transferred
physical  possession  and valid title in the Office  Building to ISI pursuant to
the terms of the Office Building Purchase  Agreement.  The Lease shall have been
terminated."

         2. ALL OTHER TERMS.  Except as specifically  amended herein,  all other
terms of the  Agreement  shall  remain  unchanged  and are hereby  ratified  and
confirmed  in all  respects. 

         The parties have entered into this Amendment effective this 26th day of
January, 1996, and such Amendment shall be effective on and after this date:



<PAGE>


"ISI"                                      "DDI"

Integrated Systems, Inc.                   Dr. Design, Inc.


By: /s/ Naren K. Gupta                     By:  /s/ Sharon Pinto
    -----------------------------             --------------------------------

Name:  Naren K. Gupta                      Name:  Sharon Pinto
    -----------------------------             --------------------------------

Its:  Chairman                             Its:  Vice President Administration
    -----------------------------             --------------------------------



"NEWCO"

ISI Purchasing Corporation


By:  /s/ David St. Charles
     ----------------------------

Name:  David St. Charles
     ----------------------------

Its:  President and Chief Executive Officer
     -----------------------------------------

                                       2



                                                                    EXHIBIT 2.02

                                STATE OF DELAWARE

                        OFFICE OF THE SECRETARY OF STATE

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




         I, EDWARD J. FREEL,  SECRETARY  OF STATE OF THE STATE OF  DELAWARE,  DO
HEREBY  CERTIFY THE  ATTACHED IS A TRUE AND CORRECT COPY OF THE  CERTIFICATE  OF
AGREEMENT OF MERGER, WHICH MERGES:

         "ISI PURCHASING  CORPORATION",  A DELAWARE  CORPORATION,  WITH AND INTO
"DR. DESIGN, INC." UNDER THE NAME OF "DR. DESIGN, INC.", A CORPORATION ORGANIZED
AND EXISTING UNDER THE LAWS OF THE STATE OF CALIFORNIA, AS RECEIVED AND FILED IN
THIS OFFICE THE TWENTY-SIXTH DAY OF JANUARY, A.D. 1996, AT 4:30 O'CLOCK P.M.

         A CERTIFIED  COPY OF THIS  CERTIFICATE  HAS BEEN  FORWARDED  TO THE NEW
CASTLE COUNTY RECORDER OF DEEDS FOR RECORDING.









                                         /s/ Edward J. Freel
                                         --------------------------------------
                                         Edward J. Freel, Secretary of State


                                         AUTHENTICATION:  7806684

                                         DATE:  1-26-96



<PAGE>



                             AGREEMENT OF MERGER OF
                           ISI PURCHASING CORPORATION,
                             A DELAWARE CORPORATION,
                                  WITH AND INTO
                                DR. DESIGN, INC.,
                            A CALIFORNIA CORPORATION


         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").



<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 SURVIVING CORPORATION.  Dr. Design, Inc., a California corporation,
will be the surviving corporation of the Merger.

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.

                                      -2-
<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.

5.       SERVICE OF PROCESS

         After the Effective Time, the Company agrees that it may be served with
process  in the State of  Delaware  in any  proceeding  for  enforcement  of any
obligation of Newco,  as well as for  enforcement  of any  obligation of Company
arising from the Merger,  including any suit or other  proceeding to enforce the
right of any stockholders as determined in appraisal proceedings pursuant to the
provisions  of ss.  262 of the  Delaware  General  Corporation  Law,  and  shall
irrevocably appoint the Secretary of State of the State of Delaware as its agent
to accept service of process in any such suit or other proceedings.  The address
to which copies of any such service of process upon the Secretary of State shall
be mailed to is:

                                          Dr. Design, Inc.
                                          5415 Oberlin Drive
                                          San Diego, CA  92121
                                          Attn:  President






                    [THE REST OF THIS PAGE HAS INTENTIONALLY
                                BEEN LEFT BLANK]

                                      -3-
<PAGE>



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



ISI PURCHASING CORPORATION


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







                      SIGNATURE PAGE TO AGREEMENT OF MERGER

                                      -4-
<PAGE>







                              OFFICER'S CERTIFICATE



Sharon Pinto hereby certifies that:

                  1. She is a Vice President of DR.  DESIGN,  INC., a California
corporation (the "Company").

                  2. The  Agreement  of  Merger  to which  this  certificate  is
attached,  after having been first duly  approved by the Board of Directors  and
shareholders  of the  Company,  was duly  signed on behalf of the Company by the
undersigned and Laura Thompson, Vice President and Secretary,  respectively,  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.

                  The  undersigned  declares  under penalty of perjury under the
laws of the State of Delaware that the matters set forth in this Certificate are
true and correct of her own knowledge.

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




/s/ Sharon Pinto
- ---------------------------------
Sharon Pinto, Vice President





<PAGE>





                              OFFICER'S CERTIFICATE



         David St. Charles hereby certifies that:

                  1.  He is the  President  of  ISI  Purchasing  Corporation,  a
Delaware corporation ("Newco").

                  2. The  Agreement  of  Merger  to which  this  certificate  is
attached,  after having been first duly  approved by the Board of Directors  and
the sole shareholder of the Company, was duly signed on behalf of the Company by
the undersigned and by Narendra Gupta, Secretary of the Company.

                  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.

                  The  undersigned  declares  under penalty of perjury under the
laws of the State of Delaware that the matters set forth in this Certificate are
true and correct of his own knowledge.

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




/s/ David St. Charles
- ----------------------------------
David St. Charles, President




                                                                   EXHIBIT 23.01



                       CONSENT OF INDEPENDENT ACCOUNTANTS


We  hereby  consent  to the  incorporation  by  reference  in  the  registration
statements  of  Integrated  Systems,  Inc.  on Form  S-8  relating  to the  1983
Incentive  Stock  Option  Plan,  1988 Stock Option  Plan,  1990  Employee  Stock
Purchase  Plan and the 1994  Directors  Stock  Option Plan of our reports  dated
November 17, 1995, on our audits of the financial  statements of Doctor  Design,
Inc.  as of and for the years ended June 30,  1995 and 1994,  which  reports are
included in the Form 8-K of Integrated Systems, Inc. dated February 5, 1996.




/s/ McGladrey & Pullen, LLP


San Diego, California
February 5, 1996





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