INTEGRATED SYSTEMS INC
S-3, 1996-04-12
PREPACKAGED SOFTWARE
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 12, 1996
 
                                                    REGISTRATION NO. 333-
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- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                            INTEGRATED SYSTEMS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
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                       CALIFORNIA                                         94-2658153
            (STATE OR OTHER JURISDICTION OF                            (I.R.S. EMPLOYER
             INCORPORATION OR ORGANIZATION)                           IDENTIFICATION NO.)
</TABLE>
 
                            ------------------------
 
                                3260 JAY STREET
                       SANTA CLARA, CALIFORNIA 95054-3309
                                 (408) 980-1500
              (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
       INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
                               NARENDRA K. GUPTA
                             CHAIRMAN OF THE BOARD
                            INTEGRATED SYSTEMS, INC.
                                3260 JAY STREET
                       SANTA CLARA, CALIFORNIA 95054-3309
                                 (408) 980-1500
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                            ------------------------
 
                                   COPIES TO:
 
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<S>                                                           <C>
                  LAIRD H. SIMONS III, ESQ.                                 WILLIAM D. SHERMAN, ESQ.
                    FRED M. GREGURAS, ESQ.                                 JOHN W. CAMPBELL III, ESQ.
                  KATHERINE T. TALLMAN, ESQ.                                  CORI M. ALLEN, ESQ.
                      MONA CHANDRA, ESQ.                                    MORRISON & FOERSTER LLP
                      FENWICK & WEST LLP                                       755 PAGE MILL ROAD
                     TWO PALO ALTO SQUARE                                 PALO ALTO, CALIFORNIA 94304
                 PALO ALTO, CALIFORNIA 94306                                     (415) 813-5600
                        (415) 494-0600
</TABLE>
 
                            ------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
 
    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  / /
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  / /
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  / /
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  / /
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  / /
                            ------------------------
 
                        CALCULATION OF REGISTRATION FEE
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                                                            PROPOSED MAXIMUM    PROPOSED MAXIMUM
  TITLE OF EACH CLASS OF SECURITIES       AMOUNT TO BE     OFFERING PRICE PER  AGGREGATE OFFERING      AMOUNT OF
           TO BE REGISTERED              REGISTERED(1)          SHARE(2)            PRICE(2)        REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------------------
  Common Stock, no par value..........    2,070,000 shs.        $24.375           $50,456,250          $17,398.71
</TABLE>
 
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(1) Includes 270,000 shares that the Underwriters have the option to purchase to
    cover over-allotments, if any.
 
(2) Estimated solely for the purpose of calculating the amount of the
    registration fee pursuant to Rule 457(c) based on the average of the high
    and low prices of the Common Stock on the Nasdaq National Market on April 9,
    1996.
                            ------------------------
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
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<PAGE>   2
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES
     MAY NOT BE SOLD NOR MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE
     REGISTRATION STATEMENT BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT
     CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY
     NOR SHALL THERE BE ANY SALE OF THESE SECURITIES IN ANY STATE IN WHICH SUCH
     OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO REGISTRATION OR
     QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
 
                  SUBJECT TO COMPLETION, DATED APRIL 12, 1996
PROSPECTUS
- ----------------
 
                                1,800,000 SHARES
 
                                      LOGO
                                  COMMON STOCK
 
     Of the 1,800,000 shares of Common Stock offered hereby, 500,000 shares are
being sold by the Company and 1,300,000 shares are being sold by the Selling
Shareholders. The Company will not receive any of the proceeds from the sale of
shares by the Selling Shareholders. See "Selling Shareholders."
 
     The Company's Common Stock is quoted on the Nasdaq National Market under
the symbol INTS. On April 10, 1996, the last reported sale price for the Common
Stock was $24.00 per share. See "Price Range of Common Stock."
 
                               ------------------
 
               THE SHARES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.
                         SEE "RISK FACTORS" ON PAGE 4.
 
                               ------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS
   THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
    COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
           ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
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                                                                                    PROCEEDS TO
                                      PRICE TO      UNDERWRITING    PROCEEDS TO       SELLING
                                       PUBLIC       DISCOUNT(1)      COMPANY(2)     SHAREHOLDERS
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Per Share.........................        $              $               $               $
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Total(3)..........................        $              $               $               $
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(1) See "Underwriting" for indemnification arrangements with the Underwriters.
 
(2) Before deducting expenses payable by the Company estimated at $350,000.
 
(3) One Selling Shareholder has granted to the Underwriters a 30-day option to
    purchase up to 270,000 additional shares of Common Stock solely to cover
    over-allotments, if any. If all such shares are purchased, the total Price
    to Public, Underwriting Discount and Proceeds to Selling Shareholders will
    be $          , $          and $          , respectively. See
    "Underwriting."
 
                               ------------------
 
     The shares of Common Stock are offered by the Underwriters subject to prior
sale, receipt and acceptance by them and subject to the right of the
Underwriters to reject any order in whole or in part and certain other
conditions. It is expected that certificates for such shares will be available
for delivery on or about May   , 1996, at the office of the agent of Hambrecht &
Quist LLC in New York, New York.
 
HAMBRECHT & QUIST                                    WESSELS, ARNOLD & HENDERSON
 
May   , 1996
<PAGE>   3
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents filed with the Securities and Exchange Commission
(the "Commission") by the Company are hereby incorporated by reference into this
Prospectus except as superseded or modified herein: (1) the Company's Annual
Report on Form 10-K for the fiscal year ended February 28, 1996 and (2) the
description of the Company's Common Stock set forth in the Company's
Registration Statement on Form 8-A filed with the Commission on January 29,
1990. All documents filed by the Company with the Commission pursuant to Section
13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), after the date of this Prospectus and prior to the
termination of the offering of the shares offered hereby shall be deemed to be
incorporated by reference into this Prospectus and to be a part hereof from the
date of filing of such documents. Any statement contained in any document
incorporated or deemed to be incorporated by reference herein shall be deemed to
be modified or superseded for purposes of this Prospectus to the extent that a
statement contained herein modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed, except as modified or
superseded, to constitute a part of this Prospectus. The Company will provide
without charge to each person, including any beneficial owner, to whom this
Prospectus is delivered, upon written or oral request of such person, a copy of
any and all of the documents that have been or may be incorporated by reference
herein (other than exhibits to such documents which are not specifically
incorporated by reference into such documents). Such requests should be directed
to Investor Relations, Integrated Systems, Inc., 3260 Jay Street, Santa Clara,
California 95054-3309. The Company's telephone number at that location is (408)
980-1500.
 
     IN CONNECTION WITH THIS OFFERING, CERTAIN UNDERWRITERS AND SELLING GROUP
MEMBERS (IF ANY) OR THEIR RESPECTIVE AFFILIATES MAY ENGAGE IN PASSIVE MARKET
MAKING TRANSACTIONS IN THE COMMON STOCK ON THE NASDAQ NATIONAL MARKET IN
ACCORDANCE WITH RULE 10B-6A UNDER THE SECURITIES EXCHANGE ACT OF 1934. SEE
"UNDERWRITING."
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK AT
A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN MARKET. SUCH
TRANSACTIONS MAY BE EFFECTED ON THE NASDAQ NATIONAL MARKET, IN THE
OVER-THE-COUNTER MARKET OR OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE
DISCONTINUED AT ANY TIME.
 
     AutoCode(R), MATRIXx(R), pSOS(R) and Xmath(R) are registered trademarks of
the Company. DocumentIt, ESp, FlexOS, pSOSystem, RealSim, SNiFF+, SystemBuild
and Embedded Internet are trademarks of the Company. This Prospectus also
includes trademarks of other companies.
 
     Integrated Systems, Inc. was incorporated in California in February 1980.
As used in this Prospectus, the "Company" and "Integrated Systems" refer to
Integrated Systems, Inc. and its subsidiaries. The Company's principal executive
offices are located at 3260 Jay Street, Santa Clara, California 95054-3309. Its
telephone number is (408) 980-1500.
 
                                        2
<PAGE>   4
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information, including "Risk Factors" and the consolidated financial statements
and notes thereto, appearing elsewhere in this Prospectus or incorporated by
reference in this Prospectus.
                                  THE COMPANY
 
     Integrated Systems designs, develops, markets and supports software
products for embedded microprocessor-based applications and also provides
related engineering services. Embedded microprocessors are used to add
functionality and intelligence to a variety of products and to operate as an
integral part of these products, generally without any direct human
intervention. The Company offers software that consists of a real-time operating
system and a series of modules and design tools that aid the development of
embedded applications. The Company's products are designed to enable users to
accelerate the design, development, debugging, implementation and maintenance of
embedded software. The Company's products and services reduce the expense
associated with embedded software and system development and enable customers to
develop systems that have greater functionality, enhanced performance, improved
reliability and ease of use. Integrated Systems markets and supports its
products and provides services on a worldwide basis to a variety of users in a
broad range of industries, including telecommunications and data communications,
automotive, multimedia and consumer and office and industrial automation.
Recently, the Company has introduced embedded operating software and design
tools for Internet applications. The Company markets its products primarily
through a direct sales force augmented by a telemarketing organization,
distributors and sales representatives. Integrated Systems' customers include
Alcatel, Daimler-Benz, General Motors, Hewlett-Packard, Honda, Motorola,
Philips, Sharp and Sony. Networks.
                                  THE OFFERING
 
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Common Stock offered by the Company..................  500,000 shares
Common Stock offered by the Selling Shareholders.....  1,300,000 shares
Common Stock to be outstanding after the offering....  21,865,650 shares(1)
Use of proceeds......................................  For general corporate purposes, including working
                                                       capital and possible acquisitions.
Nasdaq National Market symbol........................  INTS
</TABLE>
 
                 SUMMARY CONSOLIDATED FINANCIAL INFORMATION(2)
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                      FISCAL YEAR ENDED FEBRUARY 28,
                                                                          -------------------------------------------------------
                                                                           1992        1993        1994        1995        1996
                                                                          -------     -------     -------     -------     -------
<S>                                                                       <C>         <C>         <C>         <C>         <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
  Total revenue.........................................................  $24,612     $32,388     $45,783     $58,054     $84,442
  Income (loss) from operations.........................................   (7,499)      3,633       4,763       7,999       6,464
  Net income (loss).....................................................   (7,890)      3,437       4,086       6,490       5,283
  Earnings (loss) per share(3)..........................................  $ (0.45)    $  0.18     $  0.21     $  0.33     $  0.24
  Earnings per share before acquisition and other costs(4)..............  $  0.23     $  0.18     $  0.21     $  0.33     $  0.50
  Shares used in per share calculations(3)..............................   17,478      18,636      19,122      19,964      22,088
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                          FEBRUARY 28, 1996
                                                                                                      --------------------------
                                                                                                      ACTUAL      AS ADJUSTED(5)
                                                                                                      -------     --------------
<S>                                                                                                   <C>         <C>
CONSOLIDATED BALANCE SHEET DATA:
  Cash, cash equivalents and marketable securities..................................................  $49,476        $ 60,496
  Working capital...................................................................................   31,431          42,451
  Total assets......................................................................................   85,264          96,284
  Total shareholders' equity........................................................................   58,276          69,296
</TABLE>
 
- ------------------------------
(1) Based on the number of shares outstanding at February 28, 1996. Excludes (i)
    2,525,920 shares of Common Stock issuable upon exercise of stock options
    outstanding at February 28, 1996, with a weighted average exercise price of
    $7.40, and (ii) 2,647,210 shares of Common Stock are available for future
    issuance under the Company's stock option plans and stock purchase plan. See
    Note 7 of Notes to Consolidated Financial Statements.
(2) In October 1995, the Company acquired TakeFive Software GmbH and, in January
    1996, the Company acquired Doctor Design, Inc. These acquisitions were
    accounted for on a pooling of interests basis. The annual financial
    information has been restated to combine the results of the Company and
    Doctor Design, Inc. in fiscal 1994 and fiscal 1995. Fiscal 1996 includes the
    results of Doctor Design, Inc. and TakeFive Software GmbH. The annual
    financial information has not been restated for earlier years because such
    financial information was not material to the Company. See Note 2 of Notes
    to Consolidated Financial Statements.
(3) See Note 1 of Notes to Consolidated Financial Statements for an explanation
    of the determination of the number of shares used in per share calculations.
(4) Fiscal 1992 and 1996 earnings per share before acquisition and other costs
    reflect earnings per share as if the Company had not incurred such
    acquisition and other costs, net of any tax effects.
(5) Adjusted to give effect to the sale of the 500,000 shares of Common Stock
    offered by the Company hereby, at an assumed public offering price of $24.00
    per share and after deducting the estimated underwriting discount and
    expenses of this offering, and the application of the net proceeds
    therefrom. Does not include proceeds to the Company from option exercises by
    any Selling Shareholders in connection with shares sold in this offering.
    See "Use of Proceeds."
                            ------------------------
 
    Except as otherwise noted, all information in this Prospectus (i) assumes no
exercise of the Underwriters' over-allotment option; (ii) reflects the
two-for-one split of the Company's Common Stock effected on April 5, 1996; and
(iii) assumes that all fiscal years end on February 28.
 
                                        3
<PAGE>   5
 
                                  RISK FACTORS
 
     The statements contained in this Prospectus that are not purely historical
are forward looking statements, including statements regarding the Company's
expectations, hopes or intentions regarding the future. Actual results could
differ materially from those discussed in the forward-looking statements. Among
the factors that could cause actual results to differ materially are those
discussed below. In addition to the other information in this Prospectus, the
following risk factors should be considered carefully in evaluating the Company
and its business before purchasing the Common Stock offered hereby.
 
     Fluctuations in Quarterly Results.  The Company's quarterly operating
results vary significantly depending on a number of factors, including the
volume and timing of orders received during the quarter, the mix of and changes
in distribution channels through which the Company's products are sold, the
timing and acceptance of new products and product enhancements by the Company or
its competitors, changes in pricing, buyouts of run-time licenses, product life
cycles, the level of the Company's sales of third party products, purchasing
patterns of distributors and customers, competitive conditions in the industry,
business cycles effecting the markets in which the Company's products are sold,
extraordinary events, such as litigation or acquisitions, including related
charges, and economic conditions generally or in various geographic areas. All
of the foregoing factors are difficult to forecast. The future operating results
of the Company may fluctuate as a result of these and other factors, including
the Company's ability to continue to develop innovative and competitive
products.
 
     The Company historically has operated with insignificant product backlog
because its products are generally shipped as orders are received. As a result,
product revenue in any quarter depends on the volume and timing of orders
received in that quarter. In addition, the Company has at times recognized a
substantial portion of its total revenue from sales booked and shipped in the
last two weeks of the quarter such that the magnitude of quarterly fluctuations
may not become evident until very late in, or after the end of, a particular
quarter. Because the Company's staffing and operating expenses are based on
anticipated total revenue levels, and a high percentage of the Company's costs
are fixed in the short term, small variations between anticipated orders and
actual orders, as well as non-recurring or large orders, can cause
disproportionate variations in the Company's operating results from quarter to
quarter.
 
     The procurement process of the Company's customers typically ranges from a
few weeks to several months or longer from initial inquiry to order, making the
timing of sales and license fees difficult to predict. Moreover, as licensing of
the Company's products increasingly becomes a more strategic decision made at
higher management levels, there can be no assurance that sales cycles for the
Company's products will not lengthen. The Company's results of operations may
also be affected by seasonal trends. The Company's total revenue and net income
during the first fiscal quarter have been lower than the previous fourth fiscal
quarter for a variety of reasons, including customer purchase cycles related to
expiration of budgetary authorizations, and the Company expects that total
revenue and net income in the first quarter of fiscal 1997 will be lower than
the fourth quarter of fiscal 1996. In addition, in the first quarter of fiscal
1997, the Company shifted from third party distributors to direct sales and
support in Japan and Italy. In the past, the Company's sales declined in the
short term during such transitions. There can be no assurance that declines will
not occur during the current transitions or similar transitions in the future.
Also, the Company's recent acquisitions in fiscal 1996, as well as any future
acquisitions, involve numerous risks and could have a material adverse effect on
the Company's business, financial condition and results of operations. The
Company expects to move its Santa Clara, California operations to Sunnyvale,
California by the end of the first quarter of fiscal 1997. There can be no
assurance that the move will not disrupt the Company's operations or affect the
Company's operating results. Due to all of the foregoing factors, the Company
believes that period-to-period comparisons of its results of operations are not
necessarily meaningful and should not be relied upon as an indication of future
performance. It is likely that, in some future quarters, the Company's operating
results will be below the expectations of stock market analysts and investors.
In such event, the price of the Company's Common Stock would likely be
materially adversely affected. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations."
 
                                        4
<PAGE>   6
 
     Rapid Technological Change; Dependence on New Products.  The market for
embedded applications is fragmented and is characterized by ongoing
technological developments, evolving industry standards and rapid changes in
customer requirements. The Company's success depends upon its ability to
continue to develop and introduce in a timely manner new products that take
advantage of technological advances, to continue to enhance its existing product
lines, to offer its products across a spectrum of microprocessor families used
in the embedded systems market and to respond promptly to customers'
requirements. The Company must continuously update its existing products to keep
them current with changing technology and must develop new products to take
advantage of new technologies that could render the Company's existing products
obsolete. The Company has in the past experienced delays in the development of
new products and the enhancement of existing products. Such delays are
commonplace in the software industry and are likely to be experienced by the
Company in the future. The Company's future prospects depend upon the Company's
ability to increase the functionality of existing products in a timely manner
and to develop new products that address new technologies and achieve market
acceptance. New products and enhancements must keep pace with competitive
offerings, adapt to evolving industry standards and provide additional
functionality. There can be no assurance that the Company will be successful in
developing and marketing, on a timely basis or at all, competitive products,
product enhancements and new products that respond to technological change,
changes in customer requirements and emerging industry standards, or that the
Company's enhanced or new products will adequately address the changing needs of
the marketplace. The inability of the Company, due to resource constraints or
technological or other reasons, to develop and introduce new products or product
enhancements in a timely manner could have a material adverse effect on the
Company's business, financial condition or results of operations. From time to
time, the Company or its competitors may announce new products, capabilities or
technologies that have the potential to replace or shorten the life cycles of
the Company's existing products. There can be no assurance that announcements of
currently planned or other new products will not cause customers to defer
purchasing existing Company products. Any failure by the Company to anticipate
or respond adequately to changing market conditions, or any significant delays
in product development or introduction, would have a material adverse effect on
the Company's business, financial condition and results of operations. See
"Business--Product Development."
 
     Risks Associated with New or Emerging Markets.  From time to time, the
Company embarks on product development for new or emerging markets. Currently,
the Company is expending substantial time and financial resources to develop a
product line for applications that use Internet technology with embedded
microprocessors. The Company has introduced both embedded operating software and
development tools for Internet applications. The commercial Internet market has
only recently begun to develop, is rapidly changing and is characterized by an
increasing number of new entrants with competitive products. It is difficult to
predict with any assurance whether the Internet will prove to be a viable
commercial marketplace, or whether demand for Internet related products and
services will emerge or increase in the future. If the Internet market, or any
other new market targeted by the Company in the future, fails to develop,
develops more slowly than anticipated or becomes saturated with competitors, or
if the Company's products and services do not achieve or sustain market
acceptance, the Company's business, financial condition and results of
operations would be materially adversely affected. See "Business--Product
Development."
 
     Competition.  The market for commercially available software tools and
embedded operating systems is fragmented and highly competitive and is
characterized by pressures to incorporate new features and accelerate the
release of new product versions. The Company's products compete with software
developed internally by embedded systems manufacturers and software offered by
other third parties. Many organizations that internally develop and maintain
real-time operating systems have substantial programming resources and can
develop specific products for their needs. Many of these companies have
significant investments in their existing software and there can be no assurance
that the Company will be able to persuade existing and potential customers to
replace or augment their internally developed real-time operating systems with
the Company's products. The Company's principal competitors for third-party
embedded software development and related tools (pSOSystem)
 
                                        5
<PAGE>   7
 
are Mentor Graphics (through its acquisition of Microtec Research Inc.),
Microware Systems Corporation and Wind River Systems, Inc. The MATRIXx product
family competes with products offered by Mathworks Incorporated and a number of
other companies that provide design and analysis, modeling and simulation, and
code generation products. The Company also competes with a number of other
vendors that address one or more segments of the system design process,
including vendors that have modified general purpose software engineering
products for real-time and control design applications.
 
     As the industry continues to develop, the Company expects competition to
increase in the future from existing competitors and from other companies that
may enter the Company's existing or future markets with similar or substitute
solutions that may be less costly or provide better performance or functionality
than the Company's products. Some of the Company's existing and many of its
potential competitors have substantially greater financial, technical, marketing
and sales resources than the Company and there can be no assurance that the
Company will be able to compete successfully against these companies. In the
event that price competition increases significantly, competitive pressures
could cause the Company to reduce the prices of its products, which would result
in reduced profit margins. Prolonged price competition would have a material
adverse effect on the Company's business, financial condition and results of
operations. Also, run-time licenses, which provide for per-unit royalty payments
for each embedded system that incorporates the Company's real-time operating
systems, may be subject to significant pricing pressures. A variety of other
potential actions by the Company's competitors, including increased promotion
and accelerated introduction of new or enhanced products, could have a material
adverse effect on the Company's business, financial condition and results of
operations. See "Business--Competition."
 
     Acquisition-Related Risks.  The Company completed a number of acquisitions
in fiscal 1996 and may complete additional acquisitions in the future. The
process of integrating an acquired company's business into the Company's
operations may result in unforeseen operating difficulties and expenditures and
may absorb significant management attention that would otherwise be available
for the ongoing development of the Company's business. Moreover, there can be no
assurance that the anticipated benefits of an acquisition will be realized.
Future acquisitions by the Company could result in potentially dilutive
issuances of equity securities, the incurrence of debt and contingent
liabilities and amortization expenses related to goodwill and other intangible
assets, which could materially adversely affect the Company's business,
financial condition and results of operations. In addition, acquisitions involve
numerous risks, including difficulties in the assimilation of the operations,
technologies and products of the acquired companies, difficulties in managing
diverse geographic sales and research and development operations, the diversion
of management attention from other business concerns, risks of entering markets
in which the Company has no or limited direct prior experience and the potential
loss of key employees of the acquired company. The inability of the Company's
management to respond to changing business conditions effectively, including the
changes associated with its recent acquisitions, could have a material adverse
effect on the Company's business, financial condition and results of operations.
From time to time, the Company evaluates potential acquisitions of businesses,
products or technologies. The Company has no present understandings, commitments
or agreements with respect to any material acquisition of other businesses,
products or technologies, and no material acquisition is currently being pursued
actively. In the event that such an acquisition were to occur, however, there
can be no assurance that the Company's business, operating results and financial
condition would not be materially adversely affected. See "Use of Proceeds" and
"Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
     Risks Associated with International Operations.  In fiscal 1994, 1995 and
1996, the Company derived approximately 30%, 28% and 34%, respectively, of its
total revenue from sales outside of North America. The Company expects that
international sales will continue to generate a significant percentage of its
total revenue in the foreseeable future. The Company expects to continue to make
substantial investments in its international operations and to increase its
direct sales force in Europe and Asia. There can be no assurance that these
increases will result in commensurate increases in the Company's international
sales. In addition, international operations are subject to a number of special
 
                                        6
<PAGE>   8
 
risks, including foreign government regulation, more prevalent software piracy,
longer payment cycles, unexpected changes in, or imposition of, regulatory
requirements, tariffs, import and export restrictions and other barriers and
restrictions, greater difficulty in accounts receivable collection, potentially
adverse tax consequences, the burdens of complying with a variety of foreign
laws, staffing and managing foreign operations, general geopolitical risks, such
as political and economic instability, hostilities with neighboring countries
and changes in diplomatic and trade relationships, possible recessionary
environments in economies outside the United States and other factors beyond the
control of the Company. The Company generally denominates sales to and by
foreign subsidiaries in local currency, and an increase in the relative value of
the dollar against such currencies, as has recently occurred, would reduce the
Company's revenue in dollar terms or make the Company's products more expensive
and, therefore, potentially less competitive in foreign markets. The Company has
little experience in hedging its foreign currency sales and often does not hedge
such sales. There can be no assurance that the Company's future results of
operations will not be adversely affected by currency fluctuations. The Company
relies on distributors for sales of its products in certain foreign countries
and, accordingly, is dependent on their ability to promote and support the
Company's products and, in some cases, to translate them into foreign languages.
The Company's international distributors generally offer products of several
different companies, including in some cases products that are competitive with
the Company's products, and such distributors are not subject to any minimum
purchase or resale requirements. There can be no assurance that the Company's
international distributors will continue to purchase the Company's products or
provide them with adequate levels of support. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations."
 
     Risks of Product Defects; Product and Other Liability.  As a result of
their complexity, software products may contain undetected errors or
compatibility issues, particularly when first introduced or as new versions are
released. There can be no assurance that, despite testing by the Company and
testing and use by current and potential customers, errors will not be found in
new products after commencement of commercial shipments. The occurrence of such
errors could result in loss of or delay in market acceptance of the Company's
products, which could have a material adverse effect on the Company's business,
financial condition and results of operations. The increasing use of the
Company's products for applications in systems that interact directly with the
general public, particularly applications in transportation, medical systems and
other markets where the failure of the embedded system could cause substantial
property damage or personal injury, could expose the Company to significant
product liability claims. In addition, the Company's products are used for
applications in mission-critical business systems where the failure of the
embedded system could be linked to substantial economic loss. The Company's
license and other agreements with its customers typically contain provisions
designed to limit the Company's exposure to potential product liability and
other claims. It is likely, however, that the limitation of liability provisions
contained in the Company's agreements are not effective in all circumstances and
in all jurisdictions. Although the Company has not experienced any product
liability or economic loss claims to date, the sale and support of the Company's
products may entail the risk of such claims. The Company currently does not have
insurance against product liability risks or errors or omissions coverage and
there can be no assurance that such insurance will be available to the Company
on commercially reasonable terms or at all. A product liability claim or claim
for economic loss brought against the Company, or a product recall involving the
Company's software, could have a material adverse effect on the Company's
business, financial condition and results of operations. See "Business--Product
Development."
 
     Dependence on Key Personnel; Need for Additional Personnel.  The Company's
future performance depends to a significant degree upon the continued
contributions of its key management, product development, sales, marketing and
operations personnel. The Company does not have employment agreements with any
of its key personnel and does not maintain any key person life insurance
policies. In addition, the Company believes its future success will also depend
in large part upon its ability to attract and retain highly skilled managerial,
engineering, sales, marketing and operations personnel, many of whom are in
great demand. Competition for such personnel has intensified dramatically over
 
                                        7
<PAGE>   9
 
the last twelve months in Santa Clara County, California, where the Company is
headquartered, and there can be no assurance that the Company will be successful
in attracting and retaining such personnel. The failure of the Company to
attract, assimilate and retain the necessary personnel could have a material
adverse effect on the Company's business, financial condition and results of
operations. See "Business--Employees" and "Management."
 
     Limited Protection of Proprietary Technology.  The Company's success is
heavily dependent upon its proprietary technology. To protect its proprietary
rights, the Company relies on a combination of copyright, trade secret, patent
and trademark laws, nondisclosure and other contractual restrictions on copying
and distribution and technical measures. The Company seeks to protect its
software, documentation and other written materials through trade secret and
copyright laws, which provide only limited protection. In addition, the Company
holds two United States patents and has additional United States patent
applications pending. There can be no assurance that patents held by the Company
will not be challenged and invalidated, that patents will issue from any of the
Company's pending applications or that any claims allowed from existing or
pending patents will be of sufficient scope or strength (or be issued in all
countries where the Company's products can be sold) to provide meaningful
protection or any commercial advantage to the Company. As part of its
confidentiality procedures, the Company generally enters into nondisclosure
agreements with its employees, consultants, distributors and corporate partners
and limits access to and distribution of its software, documentation and other
proprietary information. End user licenses of the Company's software are
frequently in the form of shrink wrap license agreements, which are not signed
by licensees, and therefore may be unenforceable under the laws of many
jurisdictions. The source code of the Company's products is also protected as a
trade secret and is generally not licensed to customers. Despite the Company's
efforts to protect its proprietary rights, it may be possible for unauthorized
third parties to copy the Company's products or to reverse engineer or obtain
and use information that the Company regards as proprietary. There can be no
assurance that the Company's competitors will not independently develop
technologies that are substantially equivalent or superior to the Company's
technologies. Policing unauthorized use of the Company's products is difficult,
and while the Company is unable to determine the extent to which software piracy
of its products exists, software piracy can be expected to be a persistent
problem. In addition, effective protection of intellectual property rights may
be unavailable or limited in certain countries. The status of United States
patent protection in the software industry is not well defined and will evolve
as the United States Patent and Trademark Office grants additional patents.
Patents have been granted on fundamental technologies in software, and patents
may issue that relate to fundamental technologies incorporated into the
Company's products.
 
     As the number of patents, copyrights, trademarks and other intellectual
property rights in the Company's industry increases, products based on its
technology may increasingly become the subject of infringement claims. There can
be no assurance that third parties will not assert infringement claims against
the Company in the future. Any such claims with or without merit could be time
consuming, result in costly litigation, cause product shipment delays or require
the Company to enter into royalty or licensing agreements. Such royalty or
licensing agreements, if required, may not be available on terms acceptable to
the Company, or at all, which could have a material adverse affect on the
Company's business, financial condition and results of operations. In addition,
the Company may initiate claims or litigation against third parties for
infringement of the Company's proprietary rights or to establish the validity of
the Company's proprietary rights. Litigation to determine the validity of any
claims, whether or not such litigation is determined in favor of the Company,
could result in significant expense to the Company and divert the efforts of the
Company's technical and management personnel from productive tasks. In the event
of an adverse ruling in any such litigation, the Company may be required to pay
substantial damages, discontinue the use and sale of infringing products, expend
significant resources to develop non-infringing technology or obtain licenses to
infringing technology. The failure of the Company to develop or license a
substitute technology could have a material adverse affect on the Company's
business, financial condition and results of operations. See
"Business--Proprietary Rights."
 
                                        8
<PAGE>   10
 
     Dependence on Licenses from Third Parties.  The Company licenses certain
software development tool products from other companies to distribute with its
own products. The inability of such third parties to provide competitive
products with adequate features and high quality on a timely basis or to
cooperate in sales and marketing activities could have a material adverse effect
on the Company's business, financial condition and results of operations. In
addition, the Company's products compete with products produced by certain of
the Company's licensors. There can be no assurance that, upon the termination or
expiration of these licenses, such licenses will be available on reasonable
terms or at all, or that similar products could be obtained to substitute into
the tool suites. The inability to license such products could have a material
adverse effect on the Company's business, financial condition and results of
operations.
 
     Volatility of Stock Price.  The prices for the Company's Common Stock have
fluctuated widely in the past. The management of the Company believes that such
fluctuations may have been caused by actual or anticipated variations in the
Company's operating results, announcements of technical innovations or new
products or services by the Company or its competitors, changes in earnings
estimates by securities analysts and other factors, including changes in
conditions of the software and other technology industries in general. Stock
markets have experienced extreme price volatility in recent years. This
volatility has had a substantial effect on the market prices of securities
issued by the Company and other high technology companies, often for reasons
unrelated to the operating performance of the specific companies. The trading
prices of many high technology companies' stocks, including the stock of the
Company, are at or near their historical highs and reflect price/earnings ratios
substantially above historical norms. There can be no assurance that the trading
price of the Company's stock will remain at or near its current level. In the
past, following periods of volatility in the market price of a company's
securities, securities class action litigation has often been instituted against
such a company. Such litigation, if instituted, could result in substantial
costs and a diversion of management attention and resources, which would have a
material adverse effect on the Company's business, financial condition and
results of operations even if the Company is successful in such suits. These
market fluctuations, as well as general economic, political and market
conditions such as recessions, may adversely affect the market price of the
Common Stock.
 
                                        9
<PAGE>   11
 
                                USE OF PROCEEDS
 
     The net proceeds to the Company from the sale of the 500,000 shares of
Common Stock offered by the Company hereby at an assumed public offering price
of $24.00 are estimated to be $11,020,000. The Company intends to use the net
proceeds from this offering for general corporate purposes, including working
capital and possible acquisitions. From time to time, in the ordinary course of
business, the Company evaluates potential acquisitions of complementary
businesses, products or technologies, for which a portion of the net proceeds
may be used. However, the Company currently has no understandings, commitments
or agreements with respect to any material acquisition of other businesses,
products or technologies. Pending use of the net proceeds for the above
purposes, the Company intends to invest such funds in interest-bearing,
investment grade obligations. The Company will not receive any proceeds from the
sale of Common Stock by the Selling Shareholders.
 
                          PRICE RANGE OF COMMON STOCK
 
     The Common Stock of the Company commenced trading publicly on the Nasdaq
National Market on March 7, 1990 and is traded under the symbol INTS. The
following table sets forth for the periods indicated the high and low sale
prices for the Common Stock.
 
<TABLE>
<CAPTION>
                                                                        HIGH         LOW
                                                                       -------     -------
    <S>                                                                <C>         <C>
    FISCAL YEAR ENDED FEBRUARY 28, 1995
         1st Quarter.................................................  $ 6.250     $ 4.500
         2nd Quarter.................................................    6.500       4.188
         3rd Quarter.................................................    8.625       6.125
         4th Quarter.................................................   11.750       7.125
    FISCAL YEAR ENDED FEBRUARY 28, 1996
         1st Quarter.................................................   12.000       9.875
         2nd Quarter.................................................   15.375      10.000
         3rd Quarter.................................................   21.000      14.625
         4th Quarter.................................................   23.875      16.000
    FISCAL YEAR ENDING FEBRUARY 28, 1997
         1st Quarter (through April 10, 1996)........................   26.000      22.875
</TABLE>
 
     On April 10, 1996, the reported last sale price for the Common Stock on the
Nasdaq National Market was $24.00 per share. As of February 28, 1996 there were
approximately 147 holders of record of the Common Stock.
 
                                DIVIDEND POLICY
 
     The Company has not declared or paid any cash dividends on its capital
stock. The Company currently anticipates that it will retain all future earnings
for use in its business and does not anticipate paying any cash dividends in the
foreseeable future.
 
                                       10
<PAGE>   12
 
                                 CAPITALIZATION
 
     The following table sets forth the consolidated capitalization of the
Company as of February 28, 1996 as adjusted to reflect the sale of the 500,000
shares of Common Stock offered by the Company at an assumed price of $24.00 per
share and after deducting the estimated underwriting discount and estimated
offering expenses payable by the Company.
 
<TABLE>
<CAPTION>
                                                                       FEBRUARY 28, 1996
                                                                   --------------------------
                                                                   ACTUAL      AS ADJUSTED(1)
                                                                   -------     --------------
                                                                         (IN THOUSANDS)
<S>                                                                <C>         <C>
Long-term debt...................................................  $    --        $     --
Shareholders' equity:
  Preferred Stock, no par value; 5,000,000 shares authorized;
     none outstanding............................................       --              --
  Common Stock, no par value; 50,000,000 shares authorized;
     21,206,000 shares outstanding; 21,706,000 shares
     outstanding, as adjusted(2).................................   40,283          51,303
  Unrealized holding gain on marketable securities, net..........      333             333
  Retained earnings..............................................   17,660          17,660
                                                                   -------         -------
          Total shareholders' equity.............................   58,276          69,296
                                                                   -------         -------
            Total capitalization.................................  $58,276        $ 69,296
                                                                   =======         =======
</TABLE>
 
- ---------------
 
(1) Does not include proceeds to the Company from option exercises by any
     Selling Shareholders in connection with shares sold in this offering.
 
(2) Does not include 2,525,920 authorized but unissued shares of Common Stock
     issuable upon exercise of stock options outstanding at February 28, 1996,
     with a weighted average exercise price of $7.40 and 2,647,210 shares of
     Common Stock available for future issuance under the Company's stock option
     plans and stock purchase plan.
 
                                       11
<PAGE>   13
 
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
     The following selected consolidated financial data is qualified by
reference to and should be read in conjunction with the consolidated financial
statements and the notes thereto included elsewhere herein. The consolidated
statement of operations data set forth below with respect to the years ended
February 28, 1994, 1995 and 1996 and the consolidated balance sheet data at
February 28, 1995 and 1996 are derived from, and are qualified by reference to,
the audited consolidated financial statements and notes thereto included in this
Prospectus. The consolidated statement of operations data set forth below with
respect to the years ended February 28, 1992 and 1993 and the consolidated
balance sheet data at February 28, 1992 and 1993 are derived from audited
consolidated financial statements not included in this Prospectus. During fiscal
1996, the Company acquired TakeFive Software GmbH and Doctor Design, Inc. in
transactions accounted for as poolings of interests. The annual financial
information has been restated to combine the results of the Company and Doctor
Design, Inc. in fiscal 1994 and fiscal 1995. Fiscal 1996 includes the results of
Doctor Design, Inc. and TakeFive Software GmbH. The annual financial information
has not been restated for earlier years because such financial information was
not material to the Company.
 
<TABLE>
<CAPTION>
                                                                     YEAR ENDED FEBRUARY 28,
                                                     -------------------------------------------------------
                                                     1992(1)     1993(1)      1994        1995        1996
                                                     -------     -------     -------     -------     -------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                  <C>         <C>         <C>         <C>         <C>
CONSOLIDATED STATEMENTS OF OPERATIONS DATA:
  Revenue:
     Product.......................................  $13,384     $19,690     $26,350     $34,952     $51,597
     Services......................................   11,228      12,698      19,433      23,102      32,845
                                                                             -------     -------     -------
          Total revenue............................   24,612      32,388      45,783      58,054      84,442
                                                                             -------     -------     -------
  Cost and expenses:
     Cost of product revenue.......................    1,843       3,221       4,986       5,980       9,046
     Cost of services revenue......................    3,947       4,170       8,262       9,547      15,824
     Marketing and sales...........................    7,349      11,564      16,515      20,565      27,209
     Research and development......................    4,537       6,133       5,926       8,341      11,379
     General and administrative....................    1,995       2,468       3,567       4,311       6,637
     Amortization of intangible assets.............      600       1,199       1,764       1,311         556
     Acquisition and other.........................   11,840          --          --          --       7,327
                                                     -------     -------     -------     -------     -------
          Total costs and expenses.................   32,111      28,755      41,020      50,055      77,978
                                                     -------     -------     -------     -------     -------
               Income (loss) from operations.......   (7,499)      3,633       4,763       7,999       6,464
  Interest and other income........................    1,735       1,575       1,258       1,601       2,331
                                                     -------     -------     -------     -------     -------
               Income (loss) before income taxes...   (5,764)      5,208       6,021       9,600       8,795
  Provision for income taxes.......................    2,126       1,771       1,935       3,110       3,512
                                                     -------     -------     -------     -------     -------
               Net income (loss)...................  $(7,890)    $ 3,437     $ 4,086     $ 6,490     $ 5,283
                                                     =======     =======     =======     =======     =======
  Earnings (loss) per share(2).....................  $ (0.45)    $  0.18     $  0.21     $  0.33     $  0.24
                                                     =======     =======     =======     =======     =======
  Earnings per share before acquisition and other
     costs(3)......................................  $  0.23     $  0.18     $  0.21     $  0.33     $  0.50
                                                     =======     =======     =======     =======     =======
  Shares used in per share calculations(2).........   17,478      18,636      19,122      19,964      22,088
                                                     =======     =======     =======     =======     =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                                          FEBRUARY 28,
                                                     -------------------------------------------------------
                                                      1992        1993        1994        1995        1996
                                                     -------     -------     -------     -------     -------
                                                                         (IN THOUSANDS)
<S>                                                  <C>         <C>         <C>         <C>         <C>
CONSOLIDATED BALANCE SHEET DATA:
  Cash, cash equivalents and marketable
     securities....................................  $23,985     $27,150     $33,156     $36,517     $49,476
  Working capital..................................    9,744      13,005      12,298      17,783      31,431
  Total assets.....................................   38,417      40,918      52,970      66,101      85,264
  Total shareholders' equity.......................   30,946      32,447      38,032      47,948      58,276
</TABLE>
 
- ------------------------------
(1) Fiscal 1992 and 1993 have not been restated to reflect the annual financial
    information for Doctor Design, Inc. as such financial information was not
    material to the Company.
(2) See Note 1 of Notes to Consolidated Financial Statements for an explanation
    of the determination of the number of shares used in per share calculations.
(3) Fiscal 1992 and 1996 earnings per share before acquisition and other costs
    reflect earnings per share as if the Company had not incurred such
    acquisition and other costs, net of any tax effects.
 
                                       12
<PAGE>   14
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     The following discussion provides an analysis of the Company's financial
condition and results of operations, and should be read in conjunction with the
"Selected Consolidated Financial Data" and the Note thereto and the Consolidated
Financial Statements and the Notes thereto of the Company.
 
OVERVIEW
 
     Integrated Systems designs, develops, markets and supports software
products for embedded microprocessor-based applications and provides related
engineering services. The Company currently derives substantially all of its
revenues from licensing of these products and providing related maintenance and
engineering and consulting services. The Company's revenue has grown steadily
through increased licensing of existing and new products and through
acquisitions, and its net income, excluding acquisition and other charges has
also grown steadily. In October 1995, the Company acquired TakeFive Software
GmbH ("TakeFive"), an Austrian corporation in the business of developing and
marketing software tools used in software development, including SNiFF+, an
advanced object-oriented integrated development environment. In January 1996,
the Company completed a merger with Doctor Design, Inc. ("Doctor Design"), a
California corporation that develops multimedia hardware, software and
application specific integrated circuit technology. Each of these business
combinations has been accounted for as a pooling of interests and the results of
operations for fiscal 1996 include the results of TakeFive and Doctor Design for
the whole of the year. The fiscal 1994 and 1995 results have been restated to
include only the results of Doctor Design, since those of TakeFive were not
significant in those years. See "Risk Factors--Acquisition-Related Risks."
 
FORWARD-LOOKING INFORMATION IS SUBJECT TO RISK AND UNCERTAINTY
 
     Certain statements in the financial discussion and analysis by management
contain "forward-looking" information (as defined in the Private Securities
Litigation Reform Act of 1995) that involve risk and uncertainty, including
projections for fiscal 1997 and various business environment and trends
projections. Actual future results and trends may differ materially depending on
a variety of factors, including the volume and timing of orders received during
the quarter, the mix of and changes in distribution channels through which the
Company's products are sold, the timing and acceptance of new products and
product enhancements by the Company or its competitors, changes in pricing,
buyouts of run-time licenses, product life cycles, the level of the Company's
sales of third party products, purchasing patterns of distributors and
customers, competitive conditions in the industry, business cycles affecting the
markets in which the Company's products are sold, extraordinary events, such as
acquisitions or litigation, and economic conditions generally or in various
geographic areas, which are difficult to forecast. The future operating results
of the Company may fluctuate as a result of these and the other risk factors
detailed from time-to-time in the Company's Securities and Exchange Commission
reports and in the section of this Prospectus entitled "Risk Factors."
 
     Due to all of the foregoing factors, the Company believes that
period-to-period comparisons of its results of operations are not necessarily
meaningful and should not be relied upon as an indication of future performance.
It is likely that, in some future quarters, the Company's operating results will
be below the expectations of stock market analysts and investors. In such event,
the price of the Company's Common Stock would likely be materially adversely
affected. Consequently, the purchase or holding of the Company's Common Stock
involves a high degree of risk.
 
                                       13
<PAGE>   15
 
RESULTS OF OPERATIONS
 
     The following table sets forth for the periods presented the percentage of
total revenue represented by each line item in the Company's consolidated
statements of income and the percentage change in each line item from the prior
period.
 
<TABLE>
<CAPTION>
                                                      PERCENTAGE OF
                                                      TOTAL REVENUE                PERIOD-TO-PERIOD
                                                -------------------------         PERCENTAGE CHANGES
                                                                              ---------------------------
                                                 YEAR ENDED FEBRUARY 28,      FISCAL 1994     FISCAL 1995
                                                -------------------------         TO              TO
                                                1994     1995     1996(1)     FISCAL 1995     FISCAL 1996
                                                ----     ----     -------     -----------     -----------
<S>                                             <C>      <C>      <C>         <C>             <C>
Revenue:
  Product.....................................   58 %     60 %       61%           33%             48%
  Services....................................   42       40         39            19              42
                                                ---      ---        ---
          Total revenue.......................  100      100        100            27              45
                                                ---      ---        ---
Costs and expenses:
  Cost of product revenue.....................   11       10         11            20              51
  Cost of services revenue....................   18       17         19            16              66
  Marketing and sales.........................   36       36         32            25              32
  Research and development....................   13       14         13            41              36
  General and administrative..................    8        7          8            21              54
  Amortization of intangible assets...........    4        2          1          (26)            (58)
                                                ---      ---        ---
          Total costs and expenses............   90       86         84            22              41
                                                ---      ---        ---
               Income from operations.........   10       14         16            68              72
Interest and other income.....................    3        3          3            27              46
                                                ---      ---        ---
               Income before income taxes.....   13       17         19            59              68
Provision for income taxes....................    4        6          6            61              66
                                                ---      ---        ---
               Net income.....................    9 %     11 %       13%           59              69
                                                ===      ===        ===
</TABLE>
 
- ------------------------------
(1) The table excludes acquisition and other costs of $7.3 million, including
    related tax effects, in 1996 since inclusion of such costs would render
    year-to-year comparisons less meaningful.
 
     Revenue.  The Company's total revenue increased 27% from $45.8 million in
fiscal 1994 to $58.1 million in fiscal 1995 and an additional 45% to $84.4
million in fiscal 1996. A majority of the Company's total revenue came from
product revenue, which increased 33% from $26.4 million in fiscal 1994 to $35.0
million in fiscal 1995 and an additional 48% to $51.6 million in fiscal 1996.
The increase in product revenue from fiscal 1994 to fiscal 1995 was primarily
due to increased unit shipments of pSOSystem and new products. The increase in
product revenue from fiscal 1995 to fiscal 1996 was due primarily to increased
unit shipments of pSOSystem and MATRIXx and the inclusion of SNiFF+ product
revenue in fiscal 1996. pSOSystem revenue increased between both comparison
periods as a result of increased unit volume in all geographic regions and the
introduction of new products. MATRIXx revenue was flat from fiscal 1994 to
fiscal 1995 as domestic growth was offset by a decline in international revenue
due, in part, to the transition from independent sales representatives to direct
sales and support organizations in Europe. MATRIXx revenue grew from fiscal 1995
to fiscal 1996 due to increased unit shipments and the introduction of new
products. Services revenue increased 19% from $19.4 million in fiscal 1994 to
$23.1 million in fiscal 1995 and an additional 42% to $32.8 million in fiscal
1996. These increases were the result of increases in the number and size of
consulting contracts and increases in maintenance revenue from the Company's
growing installed base of customers.
 
     The percentage of the Company's total revenue from customers located
internationally was 30%, 28% and 34% in fiscal 1994, 1995 and 1996,
respectively. The Company expects international revenue will continue to grow as
a percentage of total revenue.
 
                                       14
<PAGE>   16
 
     Costs and Expenses.  The Company's cost of product revenue as a percentage
of product revenue was 19%, 17% and 18% in fiscal 1994, 1995 and 1996,
respectively. These fluctuations are due primarily to changes in the mix of
product revenue derived from the sale of higher margin products. The Company's
cost of services revenue as a percentage of services revenue was 43%, 41% and
48% in fiscal 1994, 1995 and 1996, respectively. Fluctuations in these
percentages result from shifts in service revenue mix between higher margin
maintenance revenue and lower margin consulting contract revenue.
 
     Marketing and sales expenses were $16.5 million, $20.6 million and $27.2
million in fiscal 1994, 1995 and 1996, respectively, representing 36%, 36% and
32%, respectively of total revenue. The dollar increases were primarily due to
additional expenses associated with the Company's continued expansion of its
marketing and sales organization both domestically and overseas. The percentage
decrease from fiscal 1995 to fiscal 1996 was the result of pooling the operating
results of several acquired companies whose marketing and sales expenses had
represented a smaller percentage of their total revenue. The Company anticipates
that marketing and sales expenses will increase in fiscal 1997 as a percentage
of total revenue as the Company invests in infrastructure to support certain
acquired products and to continue its expansion into new geographical areas.
 
     Research and development expenses were $5.9 million, $8.3 million and $11.4
million in fiscal 1994, 1995 and 1996, respectively, representing 13%, 14% and
13%, respectively, of total revenue. These dollar increases were primarily the
result of increased activity associated with bringing several products to
market, including increased personnel and consulting expenses, and a decrease in
software cost capitalization. Costs that are required to be capitalized under
Statement of Financial Accounting Standards No. 86, "Accounting for the Costs of
Computer Software to be Sold, Leased or Otherwise Marketed" ("SFAS No. 86") were
$335,000 in fiscal 1996 compared to $492,000 in fiscal 1995 and $1.1 million in
fiscal 1994. The amount capitalized represents approximately 3% of total
research and development expenditures for fiscal 1996 compared to 6% for fiscal
1995 and 16% for fiscal 1994. The amount of research and development
expenditures capitalized in a given time period depends upon the nature of the
development performed and, accordingly, amounts capitalized may vary from period
to period. Capitalized costs are being amortized using the greater of the amount
computed using the ratio that current gross revenues for a product bear the
total of current and anticipated future gross revenues for that product, or on a
straight-line basis over three years. Amortization for fiscal 1996 was $921,000,
compared to $607,000 for fiscal 1995 and $160,000 for fiscal 1994.
 
     General and administrative expenses were $3.6 million, $4.3 million and
$6.6 million in fiscal 1994, 1995 and 1996, respectively, representing 8%, 7%
and 8%, respectively, of total revenue. These dollar increases were primarily
the result of increased headcount, related in part to the acquisitions of Doctor
Design and TakeFive.
 
     Amortization of intangible assets was $1.8 million, $1.3 million and
$556,000 in fiscal 1994, 1995 and 1996, respectively. These dollar amounts
declined as the Company reached the end of the amortization period for software
purchased in an earlier acquisition.
 
     Acquisition and other costs in fiscal 1996 totaled $7.3 million and
comprised direct costs related to the acquisitions of TakeFive and Doctor
Design, the write-off of intangible assets related to a prior acquisition whose
product offering will be replaced by the use of other products, costs associated
with the acquisition of certain technology and related assets to enhance
pSOSystem product offerings, and costs related to the termination of a
distributor relationship in Japan. See Note 2 to Notes to Consolidated Financial
Statements.
 
     Interest and other income was $1.3 million, $1.6 million and $2.3 million
in fiscal 1994, 1995 and 1996, respectively. Interest and other income increased
due to an increase in the amount of cash equivalents and marketable securities
and to higher interest rates.
 
                                       15
<PAGE>   17
 
     The effective tax rate was 40% in fiscal 1996 compared to 32% in both
fiscal 1995 and fiscal 1994. The increase in the effective rate is due to the
effect of non-deductible acquisition and other costs. After adjusting for such
items, the effective rate for fiscal 1996 is 32%.
 
QUARTERLY FINANCIAL DATA
 
     The following tables set forth selected unaudited quarterly financial data
for the Company's fiscal year ended February 28, 1996. The unaudited information
has been prepared on the same basis as the audited information and, in the
opinion of management, reflects all adjustments (which include only normal
recurring adjustments) necessary for the fair presentation of the information
for the periods presented. Based on the Company's operating history and factors
that may cause fluctuations in the quarterly results, quarter-to-quarter
comparisons should not be relied upon as indicators of future performance.
 
<TABLE>
<CAPTION>
                                                           FISCAL YEAR ENDED FEBRUARY 28, 1996
                                                    --------------------------------------------------
                                                                      QUARTER ENDED
                                                    --------------------------------------------------
                                                    MAY 31,   AUGUST 31,   NOVEMBER 30,   FEBRUARY 28,
                                                     1995        1995          1995           1996
                                                    -------   ----------   ------------   ------------
                                                          (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                 <C>       <C>          <C>            <C>
Revenue:
  Product.........................................  $11,622    $ 12,146      $ 12,665       $ 15,164
  Services........................................    6,836       7,705         8,845          9,459
                                                    -------     -------       -------        -------
          Total revenue...........................   18,458      19,851        21,510         24,623
Costs and expenses:
  Cost of product revenue.........................    2,466       2,073         2,128          2,379
  Cost of services revenue........................    3,423       3,971         4,147          4,283
  Marketing and sales.............................    6,379       6,246         6,761          7,823
  Research and development........................    2,585       2,843         2,827          3,124
  General and administrative......................    1,557       1,604         1,563          1,913
  Amortization of intangible assets...............      186         186            77            107
  Acquisition and other...........................       --          --         3,601          3,726
                                                    -------     -------       -------        -------
          Total costs and expenses................   16,596      16,923        21,104         23,355
                                                    -------     -------       -------        -------
               Income from operations.............    1,862       2,928           406          1,268
Interest and other income.........................      525         691           511            604
                                                    -------     -------       -------        -------
          Income before income taxes..............    2,387       3,619           917          1,872
Provision for income taxes........................      809       1,185           333          1,185
                                                    -------     -------       -------        -------
          Net income..............................  $ 1,578    $  2,434      $    584       $    687
                                                    =======     =======       =======        =======
Earnings per share................................  $  0.07    $   0.11      $   0.03       $   0.03
                                                    =======     =======       =======        =======
Earnings per share before acquisition and other
  costs...........................................  $  0.07    $   0.11      $   0.14       $   0.17
                                                    =======     =======       =======        =======
Shares used in per share calculations.............   21,714      21,994        22,284         22,362
                                                    =======     =======       =======        =======
</TABLE>
 
                                       16
<PAGE>   18
 
<TABLE>
<CAPTION>
                                                            AS A PERCENTAGE OF TOTAL REVENUE(1)
                                                     --------------------------------------------------
                                                                       QUARTER ENDED
                                                     --------------------------------------------------
                                                     MAY 31,   AUGUST 31,   NOVEMBER 30,   FEBRUARY 28,
                                                      1995        1995          1995           1996
                                                     -------   ----------   ------------   ------------
<S>                                                  <C>       <C>          <C>            <C>
Revenue:
  Product..........................................     63%         61%           59%            62%
  Services.........................................     37          39            41             38
                                                     -------   ---- ---     ---- ---       ---- ---
          Total revenue............................    100         100           100            100
                                                     -------   ---- ---     ---- ---       ---- ---
Costs and expenses:
  Cost of product revenue..........................     13          11            10             10
  Cost of services revenue.........................     19          20            19             17
  Marketing and sales..............................     35          31            31             32
  Research and development.........................     14          14            13             13
  General and administrative.......................      8           8             7              8
  Amortization of intangible assets................      1           1             1             --
                                                     -------   ---- ---     ---- ---       ---- ---
          Total costs and expenses.................     90          85            81             80
                                                     -------   ---- ---     ---- ---       ---- ---
               Income from operations..............     10          15            19             20
Interest and other income..........................      3           3             2              2
                                                     -------   ---- ---     ---- ---       ---- ---
          Income before income taxes...............     13          18            21             22
Provision for income taxes.........................      4           6             7              7
                                                     -------   ---- ---     ---- ---       ---- ---
          Net income...............................      9%         12%           14%            15%
                                                     =======   =======       =======        =======
</TABLE>
 
- ---------------
(1) The table excludes acquisition and other costs, including the related tax
    effects, since inclusion of such costs would render the comparison less
    meaningful.
 
     The Company's quarterly operating results vary significantly depending on a
number of factors, including the volume and timing of orders received during the
quarter, the mix of and changes in distribution channels through which the
Company's products are sold, the timing and acceptance of new products and
product enhancements by the Company or its competitors, changes in pricing,
buyouts of run-time licenses, product life cycles, the level of the Company's
sales of third party products, purchasing patterns of distributors and
customers, competitive conditions in the industry, business cycles effecting the
markets in which the Company's products are sold, extraordinary events, such as
litigation or acquisitions, including related charges, and economic conditions
generally or in various geographic areas. All of the foregoing factors are
difficult to forecast. The future operating results of the Company may fluctuate
as a result of these and other factors, including the Company's ability to
continue to develop innovative and competitive products.
 
     The Company historically has operated with insignificant product backlog
because its products are generally shipped as orders are received. As a result,
product revenue in any quarter depends on the volume and timing of orders
received in that quarter. In addition, the Company has at times recognized a
substantial portion of its total revenue from sales booked and shipped in the
last two weeks of the quarter such that the magnitude of quarterly fluctuations
may not become evident until very late in, or after the end of, a particular
quarter. Because the Company's staffing and operating expenses are based on
anticipated total revenue levels, and a high percentage of the Company's costs
are fixed in the short term, small variations between anticipated orders and
actual orders, as well as non-recurring or large orders, can cause
disproportionate variations in the Company's operating results from quarter to
quarter.
 
     The procurement process of the Company's customers typically ranges from a
few weeks to several months or longer from initial inquiry to order, making the
timing of sales and license fees difficult to predict. Moreover, as licensing of
the Company's products increasingly becomes a more
 
                                       17
<PAGE>   19
 
strategic decision made at higher management levels, there can be no assurance
that sales cycles for the Company's products will not lengthen. The Company's
results of operations may also be affected by seasonal trends. The Company's
total revenue and net income during the first fiscal quarter have been lower
than the previous fourth fiscal quarter for a variety of reasons, including
customer purchase cycles related to expiration of budgetary authorizations, and
the Company expects that total revenue and net income in the first quarter of
fiscal 1997 will be lower than the fourth quarter of fiscal 1996. In addition,
in the first quarter of fiscal 1997, the Company shifted from third party
distributors to direct sales and support in Japan and Italy. In the past, the
Company's sales declined in the short term during such transitions. There can be
no assurance that declines will not occur during the current transitions or
similar transitions in the future. Also, the Company's recent acquisitions in
fiscal 1996, as well as any future acquisitions, involve numerous risks and
could have a material adverse effect on the Company's business, financial
condition and results of operations. The Company expects to move its Santa
Clara, California operations to Sunnyvale, California by the end of the first
quarter of fiscal 1997. There can be no assurance that the move will not disrupt
the Company's operations or affect the Company's operating results. Due to all
of the foregoing factors, the Company believes that period-to-period comparisons
of its results of operations are not necessarily meaningful and should not be
relied upon as an indication of future performance. It is likely that, in some
future quarters, the Company's operating results will be below the expectations
of stock market analysts and investors. In such event, the price of the
Company's Common Stock would likely be materially adversely affected.
 
RECENT ACCOUNTING PRONOUNCEMENTS
 
     During March 1995, the Financial Accounting Standards Board issued
Statement No. 121, "Accounting for the Impairment of Long-Lived Assets and for
Long-Lived Assets to Be Disposed Of" (SFAS No. 121), which requires the Company
to review for impairment of long-lived assets, certain identifiable intangibles
and goodwill related to those assets whenever events or changes in circumstances
indicate that the carrying amount of an asset may not be recoverable. In certain
situations, an impairment loss would be recognized. SFAS No. 121 will be
effective for the Company's fiscal year 1997. The Company has studied the
implications of the statement, and, based on its initial evaluation, does not
expect it to have a material impact on the Company's financial condition or
results of operations.
 
     During October 1995, the Financial Accounting Standards Board issued
Statement of Financial Accounting Standard No. 123, "Accounting for Stock-Based
Compensation" (SFAS No. 123). This accounting standard permits the use of either
a fair value based method or the current Accounting Principals Board Opinion No.
25, "Accounting for Stock Issued to Employees" (APB No. 25) when accounting for
stock-based compensation arrangements. Companies that do not follow the new fair
value based method will be required to disclose pro forma net income and
earnings per share computed as if the fair value based method had been applied.
The disclosure provisions of SFAS No. 123 are effective for fiscal years
beginning after December 15, 1995. Management has not determined whether it will
adopt the fair value based method of accounting for stock-based compensation
arrangements nor the impact of SFAS No. 123 on the Company's consolidated
financial statements.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     The Company has funded its operations to date principally through cash
flows from operations. As of February 28, 1996, the Company had $49.5 million of
cash, cash equivalents and marketable securities. This represents an increase of
$13.0 million from February 28, 1995. During the first quarter of fiscal 1995,
the Company announced that the Board of Directors had authorized the Company to
repurchase up to an additional 1,000,000 shares of Common Stock for cash, from
time-to-time at market prices, pursuant to a repurchase program announced in
September 1992. In the second quarter of fiscal 1995, under this program, the
Company repurchased 250,000 shares of Common Stock for $1.1 million. The Company
believes that cash flows from operations, together with existing cash balances,
available
 
                                       18
<PAGE>   20
 
borrowings and the proceeds from this offering, will be adequate to meet the
Company's cash requirements for working capital, capital expenditures and stock
repurchases for the next 12 months and the foreseeable future.
 
     Net cash provided by operating activities during fiscal 1996 totaled $18.5
million, an increase of $10.7 million over the amount generated in fiscal 1995
which increased by $293,000 over fiscal 1994. The increase in net cash provided
by operating activities in fiscal 1996 was due to increases in depreciation and
amortization, current liabilities, income taxes payable and deferred revenue
were offset by increases in accounts receivable and other current assets.
 
     Net cash used in investing activities totaled $6.0 million in fiscal 1996
compared to $9.3 million in fiscal 1995 and $7.0 million in fiscal 1994. The
decrease in net cash used in investing activities in fiscal 1996 was due
primarily to the reduction in net purchases of marketable securities, offset by
increases in additions to property and equipment and net cash paid in
acquisitions. The increase in net cash used in investing activities in fiscal
1995 was due primarily to the acquisition of the FlexOS product line and an
increase in expenditures for property and equipment.
 
     Net cash provided by financing activities totaled $1.6 million in fiscal
1996 compared to $961,000 in fiscal 1995 and $674,000 in fiscal 1994. The
increase in net cash provided by financing activities in fiscal 1996 was due to
an increase in proceeds from the exercise of options to purchase Common Stock
and purchases under the Employee Stock Purchase Plan and the absence of Common
Stock repurchases. The increase in net cash provided by financing activities in
fiscal 1995 was due to an increase in proceeds from the exercise of options to
purchase Common Stock and purchases under the Employee Stock Purchase Plan,
offset by the repurchase of 250,000 shares of Common Stock.
 
     After the end of fiscal 1996, in March 1996, the Company purchased a
building, which will become its principal facility, for cash of approximately
$12.0 million. The Company expects the move to this new facility to be completed
by the end of the first quarter of fiscal 1997.
 
                                       19
<PAGE>   21
 
                                    BUSINESS
 
     Integrated Systems designs, develops, markets and supports software
products for embedded microprocessor-based applications and also provides
related engineering services. Embedded microprocessors are used to add
functionality and intelligence to a variety of products and to operate as an
integral part of these products, generally without any direct human
intervention. The Company offers software that consists of a real-time operating
system and a series of modules and design tools that aid the development of
embedded applications. The Company's products are designed to enable users to
accelerate the design, development, debugging, implementation and maintenance of
embedded software. The Company's products and services reduce the expense
associated with embedded software and system development and enable customers to
develop systems that have greater functionality, enhanced performance, improved
reliability and ease of use. Integrated Systems markets and supports its
products and provides services on a worldwide basis to a variety of users in a
broad range of industries, including telecommunications and data communications,
automotive, multimedia and consumer and office and industrial automation.
Recently, the Company has introduced embedded operating software and design
tools for Internet applications.
 
INDUSTRY BACKGROUND
 
     Embedded systems consist of a microprocessor and related software dedicated
to a specialized task or set of tasks and are found in many common products such
as telephones, automobiles, VCRs and facsimile machines. Many of these products
require real-time embedded systems that provide an immediate, predictable
response to unpredictable sequences of external events under severe deadlines.
For example, the embedded system that controls the engine in an automobile must
set airflow, fuel quantity, spark advance and other engine parameters for each
cycle within milliseconds based on engine speed, engine temperature, atmospheric
conditions and accelerator position in order to optimize fuel efficiency,
emissions control and responsiveness.
 
     As more powerful microprocessors have become available and decreased in
price, the use of embedded systems are being used in or with a wider range of
applications. Today, embedded systems are found in telecommunications and data
communications products such as routers, access devices and switches; automotive
products such as engine controllers and anti-lock braking systems; multimedia
and consumer products such as digital video broadcast and security systems; and
office and industrial automation products such as printers, copiers and
point-of-sale terminals. Emerging embedded Internet applications for interactive
entertainment, network computers, remote maintenance and other areas may offer
significant new opportunities for embedded systems.
 
     The development of applications software for embedded systems requires
software development tools and a real-time operating system. Real-time operating
systems and software development tools, including compilers, debuggers and
simulators, are used by developers to create applications software that enables
the embedded system to perform its required functions. Embedded systems are
increasingly based upon 32-bit microprocessors, which run significantly larger
and more sophisticated application software than embedded systems based upon
less powerful microprocessors. In addition, the cost of some 32-bit
microprocessors has decreased substantially to below $10, thereby opening new
markets for high-volume embedded applications that can now be cost justified. As
a result, 32-bit microprocessors represent the fastest growing segment of the
embedded microprocessor industry. The complexity and size of these new software
applications and the proliferation of multiple types of microprocessors require
a more substantial engineering effort, necessitating more sophisticated
development tools and real-time operating systems.
 
     Developers of embedded systems are increasingly replacing internally
developed real-time operating systems with commercially available products as
organizations find in-house development and maintenance costly and a diversion
of core engineering resources. Also, developers of embedded systems often find
that in-house real-time operating systems developed for a single project are not
easily ported to other microprocessors or scalable for different applications
within the organization,
 
                                       20
<PAGE>   22
 
which increases development time and cost. As a result, organizations are
seeking to improve engineering productivity by standardizing on third-party
software in order to eliminate software incompatibilities and reduce training
and support costs. With productivity becoming a more strategic issue, selection
of tools and real-time operating system technology is increasingly being
evaluated by senior managers for division or company-wide deployment. The
Company believes that more organizations will need to replace in-house tools
with commercial products and to standardize on integrated enterprise-wide
solutions that are highly reliable, easily customizable and scalable so that
they can be used for simple as well as complex applications.
 
INTEGRATED SYSTEMS' SOLUTION
 
     Integrated Systems provides comprehensive solutions for the development of
highly reliable and sophisticated embedded microprocessor-based applications.
The Company offers operating software that consists of a real-time system, the
pSOSystem, and a series of modules and design tools. The Company's products are
designed to enable users to accelerate the design, development, debugging,
implementation and maintenance of embedded software and to develop systems that
have greater functionality, enhanced performance, improved reliability and ease
of use. The Company also offers a range of consulting services, including
product and system design, training in the use of the Company's products and
development of specialized application code or drivers for incorporation into
customers' applications. These services have allowed the Company to offer
customers complete designs based on the Company's products and have allowed more
rapid use of the Company's technology in customers' product designs. The
Company's solution is used in embedded and real-time applications in a broad
range of industries, including telecommunications and data communications,
automotive, multimedia and consumer and office and industrial automation.
Recently, the Company has introduced embedded operating software and design
tools for Internet applications. The solution offered by Integrated Systems
provides the following features and benefits:
 
     High Reliability.  The Company's pSOS+ operating system is highly reliable,
making it suitable for deeply embedded applications where human intervention to
remedy software operating problems is not feasible. High reliability reduces
maintenance costs and allows the Company's customers to develop sophisticated
mass market products based on Integrated Systems' solution.
 
     Suitability For High Volume Applications.  The Company offers a
full-featured high performance operating system with memory requirements as low
as 16 Kbytes. In addition, the Company's operating system is very efficient,
enabling the Company's customers to minimize hardware costs while increasing the
functionality of their application designs. The Company's solutions are suitable
for low-cost, high-volume applications because of their low memory and other
hardware requirements and for hand-held applications in which less complex
hardware conserves battery power.
 
     Customability and Scalability.  The Company's product architecture is
modular, scalable and readily customizable. As a result, the Company's solution
is used in a broad range of industries for a wide array of applications. In
addition, these product features enable the Company to enter new and emerging
markets rapidly. The Company endeavors to be first to market with support for
new applications and microprocessors.
 
     Cross-Development Capabilities.  To accelerate the application development
process, Integrated Systems offers a set of tools specifically designed for
embedded software development that fully supports object-oriented methodologies.
The Company's solution provides an integrated development environment ("IDE") to
which individual development tools can be connected. The Company's IDE includes
SNiFF+, which is an advanced, object-oriented environment for the development of
sophisticated applications. The Company offers comprehensive cross-development
capabilities that allow its development tools to operate on a personal computer
or workstation, while the embedded software runs on an embedded processor. The
Company offers MATRIXx, a high-level set of tools for modeling, simulation and
code generation from a graphical description of real-time control software
functionality.
 
                                       21
<PAGE>   23
 
     Application-Specific Modules.  The Company offers various application
specific modules that run on top of the Company's operating system and that
allow the operating software to be more easily targeted to specific applications
without degrading performance of the operating system.
 
BUSINESS STRATEGY
 
     The Company's objective is to maintain its leadership position in the
telecommunications and data communications, automotive, multimedia and consumer
and office and industrial automation markets, and leverage its experience in
embedded applications to enter new markets, such as embedded Internet
applications, in which the Company believes it can establish a leadership
position. To achieve these objectives, the Company is pursuing the following
business strategy:
 
     Maintain Technology Leadership.  The Company's extensive expertise in
embedded software development tools and real-time operating systems has enabled
it to be a technology leader in the embedded software development market. The
Company seeks to capitalize on this existing technology base to accelerate the
development of new products that leverage the features of its existing product
line. The Company intends to maintain its technological leadership through rapid
response to emerging opportunities and customer requirements by continuing to
make significant investments in research and development and continuing to
enhance the architecture of its development tools and operating software.
 
     Offer Comprehensive Solutions.  The Company's products and services offer a
comprehensive solution to users of embedded microprocessors. This approach
simplifies customers' purchasing decisions, eliminates the need for customers to
integrate products from multiple sources, improves customer support, accelerates
the integration of the Company's technology into customers' products and allows
the Company's products to be used effectively by less experienced engineers. The
Company expects to continue to expand and refine its solution through internal
development activities and strategic acquisitions.
 
     Maintain Market Focus.  While the Company's products and services are
suitable for a wide variety of applications and are sold to a broad range of
customers, the Company has focused its development and marketing efforts on the
telecommunications and data communications, automotive, multimedia and consumer
and office and industrial automation markets. The Company has developed a
complete suite of products to address these markets in order to achieve deeper
penetration, as well as to provide products that reduce the time and expense
associated with system development. The Company seeks to participate in the
rapid growth of low-cost, high-volume applications for embedded systems through
run-time license arrangements with its customers based on the number of products
sold that incorporate the Company's products.
 
     Address Emerging Market Opportunities.  From time to time, the Company
evaluates strategic opportunities and applies its technology to develop products
for new markets more quickly. The Company recently introduced design tools and
operating software products for the embedded Internet market based in part on
technology obtained through recent acquisitions. The Company believes its
products and services are suitable for emerging markets because its products are
scalable, reliable and rapidly reconfigurable.
 
     Focus on Large Accounts.  Integrated Systems markets its software products
and engineering services to large customers to encourage them to use the
Company's products in multiple designs. This strategy has made it possible for
certain large customers to standardize on the Company's products. In addition,
it allows the Company to learn from large customers about future requirements
that the Company may incorporate into its products and services.
 
     Portability and Support for Widely-Used Embedded Microprocessors and Host
Platforms.  The Company has expended significant resources to make its products
available on a broad range of host platforms and 32-bit embedded
microprocessors. This has allowed the Company to sell into a broad
 
                                       22
<PAGE>   24
 
range of markets. Because large companies use a range of host platforms and
microprocessors, it also makes it possible for large customers to standardize on
Integrated Systems' solution.
 
PRODUCTS AND SERVICES
 
     The Company offers three major families of products to support the embedded
software development market: real-time or embedded operating software, software
development tools and graphical design products.
 
     Embedded Operating Software.  Integrated Systems' embedded operating
software consists of the pSOS+ operating system and special purpose modules that
run on the pSOS+ operating system. The combination of real-time operating
software and development tools is marketed and licensed as pSOSystem. pSOS+ is a
priority-based, interrupt-oriented, multitasking operating system that is small
in size (requiring as little as 16 Kbytes of storage) and highly reliable and
efficient. Based on a scalable software component architecture, pSOS+ represents
a complete solution for advanced 32-bit embedded applications development and
run-time. The Company also offers a multiprocessing version, called pSOS+m, that
operates on tightly coupled or loosely coupled microprocessors. pSOS+ operating
system is currently available for the Motorola 68xxx, Intel x86 and i960, Power
PC, MIPS and Hitachi SH product families.
 
     The special purpose modules that run on the pSOS+ operating system are used
to support development of pSOS+ application software, to debug embedded code and
to provide file support for embedded applications. The Company also offers X11
graphical user interface modules for embedded applications. In addition, the
Company offers a number of modules that address networking, telecommunications
and data communications, automotive, multimedia and consumer and embedded
Internet applications. These modules provide complete implementation of certain
aspects of the applications at which they are focused, which improves customers'
time to market and reliability. For example, the TCP/IP module offered by the
Company provides a complete implementation of the TCP/IP communication protocol.
 
     Software Development Tools.  The Company offers a broad line of tools to
support the development of embedded software applications. The Company's
development tools consist of an integrated development environment ("IDE"),
which provides sophisticated cross development frameworks, and individual tools
that are connected to these frameworks. The Company's IDE includes SNiFF+, which
is an advanced, object-oriented environment for the development of sophisticated
applications including the development of complex object-oriented desktop and
client-server applications. Individual tools offered by the Company include C
and C++ cross-compilers, source level debuggers, browsers, pSOS+ simulators and
profilers. The Company also offers a visual debugging and analysis tool called
ESp that graphically displays component configurations, memory stack usage and
errors, static and dynamic views of all kernel objects, user specified events
and CPU use graphs. The Company also offers IDE products and individual tools
that are licensed from third parties or that include technology licensed from
third parties. The Company's tools operate on Windows-based personal computers
and workstations manufactured by Sun Microsystems, Hewlett-Packard and IBM.
 
     Graphical Design Products.  The Company's graphical design product line,
called MATRIXx, includes control system engineering tools for analysis, design,
simulation and prototyping. Products and modules in the MATRIXx family include
the following:
 
          --Xmath is a mathematically-based engineering analysis tool that
     provides analysis capabilities, plot generation facilities and specialized
     function libraries for control design, robust control, optimization,
     digital signal processing, system identification and model reduction
     applications.
 
          --SystemBuild is a system modeling and simulation tool used to create
     interactive, dynamic system models that include plant dynamics and
     real-time software logic. SystemBuild includes a block diagram editor,
     tools to create animated system simulations and state transition diagrams.
     In
 
                                       23
<PAGE>   25
 
     addition, customers can order special purpose libraries for a variety of
     needs, including fuzzy logic systems. The architecture of SystemBuild
     allows the creation of application-specific libraries.
 
          --AutoCode automatically generates programming code from SystemBuild
     diagrams in the C or Ada languages. This accelerates application
     development by relieving engineers of line-by-line programming and sharply
     reducing programming errors committed as projects move from design analysis
     to programming phrases.
 
          --DocumentIt software further accelerates the design process by
     automatically incorporating information about a design into a documentation
     format.
 
          --RealSim Series prototyping tools complete the family by providing
     the software and real-time computing hardware to verify an application in
     its intended environment. C or Ada code generated in the AutoCode
     environment automatically loads and runs on RealSim Series hardware.
 
     Embedded Internet Products. In January 1996, the Company announced the
availability of pSOSystem modules directed at embedded Internet applications.
The first two modules offered by the Company in its Embedded Internet family are
Java support for pSOSystem, which allows developers to build Internet
applications on pSOSystem, and an HTTP server based on pSOS+, which allows the
Company's operating software to be used for embedded Internet servers. For
example, one of the Company's customers has recently demonstrated a network
management capability for global networks based on the Company's product
providing Java support for pSOSystem. The Company has also recently introduced a
SNiFF+ design environment for Java that enables the development of both embedded
and desktop Java-based Internet applications. The Company expects to announce
additional Embedded Internet products during 1996.
 
     Engineering Services.  In addition to the products described above, the
Company offers engineering services to its customers. The Company's engineering
services group helps customers design and implement specific solutions typically
using tools provided by the Company. The Company provides engineering services
to develop close relationships with key customers, to accelerate acceptance of
advanced tools in the industry, to demonstrate the effectiveness of the
products, to learn more about specific systems and customer's development needs
and to work with the Company's product development group to incorporate
appropriate features into new versions of products or into new modules or
libraries. Engineering services projects can last from a few weeks to several
years and are generally performed on a time and materials basis.
 
SALES AND SUPPORT
 
     The Company markets its products primarily through a direct sales force
augmented by a focused telemarketing organization, distributors and sales
representatives. The Company believes that use of a direct sales force allows
the Company to influence customer purchasing decisions, to provide superior
support to its customers and to understand better evolving customer needs. The
Company has significantly expanded the number of markets where it uses a direct
sales force and expects to continue to do so in the future.
 
     The Company's direct sales organization in North America operates through
14 United States sales offices and a recently-opened subsidiary in Canada.
Direct sales managers are typically supported by field application engineers
that are experts in the Company's technology and products. In addition, a small
telemarketing organization focuses on selling maintenance and renewal contracts,
licensing lower-priced products and licensing to universities.
 
     Sales internationally are supported by a direct sales force that operates
from subsidiaries based in France, Germany, Italy, Sweden, the United Kingdom,
Israel and Japan. In addition, the Company has sales and support offices in
Korea and India. The sales and support personnel in these subsidiaries and
offices are complemented by distributors and sales representatives that address
certain geographical areas, market segments or product families. Sales
representatives market and support the Company's
 
                                       24
<PAGE>   26
 
products in Australia, China, India, Korea, Taiwan and several other countries
in Asia, while distributors cover the rest of the world. The Company initiated
direct selling operations in Japan and Italy, replacing its existing third party
distributor arrangements, and implemented certain substantial changes to its
direct sales operations in Germany and France in the first quarter of fiscal
1997. These transitions may result in a decline in the Company's sales in those
countries during such transition.
 
     The Company's software development products are typically licensed on a
per-user basis. The Company's real-time operating systems and run-time packages
are also generally licensed for development on a per-user basis. Run-time
license fees are typically charged on a per-unit basis when the customer's
application is deployed. List prices for the Company's software development
tools and real-time operating systems development licenses generally range from
less than $4,000 to over $100,000, with a typical development license averaging
between $25,000 and $50,000.
 
     Approximately 30%, 28% and 34% of the Company's total revenue was derived
from sales outside of North America in fiscal 1994, 1995 and 1996, respectively.
See Note 10 of Notes to Consolidated Financial Statements. The Company has made
significant investments in developing its distribution and support channels
outside North America to increase the percentage of revenue derived from
international sales. There can be no assurance that changes from distribution
sales to direct sales or these additional investments will lead to increased
revenue. See "Risk Factors--Risks Associated with International Operations."
 
                                       25
<PAGE>   27
 
CUSTOMERS AND APPLICATIONS
 
     The Company markets its products to customers in a variety of industries,
with principal focus on telecommunications and data communications, automotive,
multimedia and consumer office and industrial automation, as well as in the
embedded Internet market. No single customer accounted for more than 10% of the
Company's total revenue in fiscal 1995 or fiscal 1996.
 
     The Company's customers include the following:
 
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------
<S>                                             <C>
 CUSTOMERS                                      SELECTED APPLICATIONS
- ------------------------------------------------------------------------------------
 TELECOMMUNICATIONS AND DATA COMMUNICATIONS:
  Alcatel                                       Telephone switching equipment
  AT&T                                          Central office switching equipment
  Cascade Communications                        Frame relay switch
  DSC Communications                            Interoffice switching equipment
  Fujitsu                                       SONET switch
  Motorola Corporation                          Satellite communications system
  Northern Telecom                              PBXs
  Samsung                                       Transmission equipment
- ------------------------------------------------------------------------------------
 AUTOMOTIVE:
  Bosch                                         Automotive components
  Daimler-Benz                                  Automotive electronics
  Ford Motor Corporation                        Chassis control
  General Motors                                Powertrain controllers
  Honda                                         Engine controllers
  Nissan                                        Automotive electronics
  Toyota                                        Traction control
- ------------------------------------------------------------------------------------
 MULTIMEDIA AND CONSUMER:
  Hewlett-Packard                               Set-top box development
  Philips N.V.                                  HDTV and consumer appliances
  Sega Corporation                              Karaoke system
  Sony Corporation                              Digital broadcast satellite system
- ------------------------------------------------------------------------------------
 OFFICE AND INDUSTRIAL AUTOMATION:
  Eastman Kodak Company                         Copiers
  Sharp Corporation                             Multifunction devices
  Xerox Corporation                             Copiers and printers
- ------------------------------------------------------------------------------------
 EMBEDDED INTERNET:
  UB Networks                                   Network management
  Xionics                                       Printer maintenance and
                                                management
- ------------------------------------------------------------------------------------
 MISCELLANEOUS:
  Gilbarco                                      Automated gas pumps
  G-TECH                                        Electronic lottery machines
- ------------------------------------------------------------------------------------
</TABLE>
 
                                       26
<PAGE>   28
 
PRODUCT DEVELOPMENT
 
     The Company's product development activities specifically address the needs
of the market segments upon which the Company focuses, offer customers open
cross-development capability and enhance the capabilities of current products
and modules to address user requirements. In addition, the Company seeks to port
the pSOSystem to additional microprocessors, make the pSOSystem suitable for
additional high-volume applications, add new products and modules to the
Company's product lines, create interfaces between the Company's products and
other key computer-aided design and software development tools and provide the
end user greater flexibility to integrate automatically-generated code with
manually-written code, thereby allowing the end user to accelerate application
development.
 
     The Company attempts to release upgrades and to introduce new products or
modules on a regular basis. In connection with each release, the Company works
closely with its customers to define improvements and enhancements that are
incorporated into the next release of the product. This approach includes
customer feedback in the Company's product design process, as well as in the
evaluation stage, thereby permitting customers to influence functionality early
in the product's life-cycle. The Company believes that its engineering services
group provides the Company with a competitive advantage for product development
by defining needs for new products, guiding future enhancements and testing new
implementations. In addition, this group contracts with customers to research
new methodologies that can serve as prototypes for new features, products or
modules. As of February 28, 1996, the Company employed 127 engineers in the
product development group and 62 in the engineering services group. The
Company's engineers include experts in software engineering, software
development tools, multimedia, telecommunications, real-time controls and
operating systems technology.
 
     For fiscal 1994, 1995 and 1996, the Company's research and development
expenses were approximately $5.9 million, $8.3 million and $11.4 million or 13%,
14% and 13% of its total revenue, respectively. The Company capitalizes certain
costs of developing computer software to be licensed or otherwise marketed to
customers in accordance with Statement of Financial Accounting Standards No. 86,
"Accounting for the Costs of Computer Software to be Sold, Leased or Otherwise
Marketed" ("SFAS No. 86"). The Company capitalized approximately $1.1 million,
$492,000 and $335,000 of research and development expenses related to the
development of software products in fiscal 1994, 1995 and 1996, respectively.
The amounts capitalized represented approximately 16%, 6% and 3%, respectively,
of total research and development expenses for fiscal 1994, 1995 and 1996. Such
capitalized costs are being amortized using the greater of the amount computed
using the ratio that current gross revenues for a product bear to the total of
current and anticipated future gross revenues for that product, or on a
straight-line basis over three years. Amortization of capitalized cost for
fiscal 1994, 1995 and 1996 was $160,000, $607,000 and $921,000, respectively.
The amount of research and development expenses capitalized in a given time
period depends upon the nature of the development performed and, accordingly,
amounts capitalized may vary from period to period.
 
     The market for embedded applications is fragmented and is characterized by
ongoing technological developments, evolving industry standards and rapid
changes in customer requirements. The Company's success depends upon its ability
to continue to develop and introduce in a timely manner new products that take
advantage of technological advances, to continue to enhance its existing product
lines, to offer its products across a spectrum of microprocessor families used
in the embedded systems market and to respond promptly to customers'
requirements. The Company must continuously update its existing products to keep
them current with changing technology and must develop new products to take
advantage of new technologies that could render the Company's existing products
obsolete. The Company has in the past experienced delays in the development of
new products and the enhancement of existing products. Such delays are
commonplace in the software industry and are likely to be experienced by the
Company in the future. The Company's future prospects depend upon the Company's
ability to increase the functionality of existing products in a timely manner
and to develop new products that address new technologies and achieve market
acceptance. New products
 
                                       27
<PAGE>   29
 
and enhancements must keep pace with competitive offerings, adapt to evolving
industry standards and provide additional functionality. There can be no
assurance that the Company will be successful in developing and marketing, on a
timely basis or at all, competitive products, product enhancements and new
products that respond to technological change, changes in customer requirements
and emerging industry standards, or that the Company's enhanced or new products
will adequately address the changing needs of the marketplace. The inability of
the Company, due to resource constraints or technological or other reasons, to
develop and introduce new products or product enhancements in a timely manner
could have a material adverse effect on the Company's business, financial
condition or results of operations. From time to time, the Company or its
competitors may announce new products, capabilities or technologies that have
the potential to replace or shorten the life cycles of the Company's existing
products. There can be no assurance that announcements of currently planned or
other new products will not cause customers to defer purchasing existing Company
products. Any failure by the Company to anticipate or respond adequately to
changing market conditions, or any significant delays in product development or
introduction, would have a material adverse effect on the Company's business,
financial condition and results of operations. Currently, the Company is
expending substantial time and financial resources to develop a product line for
applications that use Internet technology with embedded microprocessors. If the
Internet market, or any other new market targeted by the Company in the future,
fails to develop, develops more slowly than anticipated or becomes saturated
with competitors, or if the Company's products and services do not achieve or
sustain market acceptance, the Company's business, financial condition and
results of operations would be materially adversely affected. See "Risk
Factors -- Risks Associated with New or Emerging Markets."
 
COMPETITION
 
     The market for commercially available software tools and embedded operating
systems is fragmented and highly competitive and is characterized by pressures
to incorporate new features and accelerate the release of new product versions.
The Company's products compete with software developed internally by embedded
systems manufacturers and software offered by other third parties. Many
organizations that internally develop and maintain real-time operating systems
have substantial programming resources and can develop specific products for
their needs. Many of these companies have significant investments in their
existing software and there can be no assurance that the Company will be able to
persuade existing and potential customers to replace or augment their internally
developed real-time operating systems with the Company's products.
 
     The Company's principal competitors for third-party embedded software
development and related tools (pSOSystem) are Mentor Graphics (through its
acquisition of Microtec Research Inc.), Microware Systems Corporation and Wind
River Systems, Inc. The MATRIXx product family competes with products offered by
Mathworks Incorporated and a number of other companies that provide design and
analysis, modeling and simulation, and code generation products. The Company
also competes with a number of other vendors that address one or more segments
of the system design process, including vendors that have modified general
purpose software engineering products for real-time and control design
applications.
 
     As the industry continues to develop, the Company expects competition to
increase in the future from existing competitors and from other companies that
may enter the Company's existing or future markets with similar or substitute
solutions that may be less costly or provide better performance or functionality
than the Company's products. Some of the Company's existing and many of its
potential competitors have substantially greater financial, technical, marketing
and sales resources than the Company and there can be no assurance that the
Company will be able to compete successfully against these companies. In the
event that price competition increases significantly, competitive pressures
could cause the Company to reduce the prices of its products, which would result
in reduced profit margins. Prolonged price competition would have a material
adverse effect on the Company's business, financial condition and results of
operations. Also, run-time licenses, which provide for per-unit royalty payments
for each embedded system that incorporates the Company's real-time operating
 
                                       28
<PAGE>   30
 
systems, may be subject to significant pricing pressures. A variety of other
potential actions by the Company's competitors, including increased promotion
and accelerated introduction of new or enhanced products, could have a material
adverse effect on the Company's business, financial condition and results of
operations.
 
     The Company believes that the principal bases for a customer's decision to
license the Company's products are product functionality and performance, degree
of integration, ease of product use, quality of support services and corporate
reputation. The Company believes that it competes favorably in these areas.
 
PROPRIETARY RIGHTS
 
     The Company's success is heavily dependent upon its proprietary technology.
To protect its proprietary rights, the Company relies on a combination of
copyright, trade secret, patent and trademark laws, nondisclosure and other
contractual restrictions on copying and distribution and technical measures. The
Company seeks to protect its software, documentation and other written materials
through trade secret and copyright laws, which provide only limited protection.
In addition, the Company holds two United States patents and has additional
United States patent applications pending. There can be no assurance that
patents held by the Company will not be challenged and invalidated, that patents
will issue from any of the Company's pending applications or that any claims
allowed from existing or pending patents will be of sufficient scope or strength
(or be issued in all countries where the Company's products can be sold) to
provide meaningful protection or any commercial advantage to the Company. As
part of its confidentiality procedures, the Company generally enters into
nondisclosure agreements with its employees, consultants, distributors and
corporate partners and limits access to and distribution of its software,
documentation and other proprietary information. End user licenses of the
Company's software are frequently in the form of shrink wrap license agreements
which are not signed by licensees, and therefore may be unenforceable under the
laws of many jurisdictions. The source code of the Company's products is also
protected as a trade secret and is generally not licensed to customers. Despite
the Company's efforts to protect its proprietary rights, it may be possible for
unauthorized third parties to copy the Company's products or to reverse engineer
or obtain and use information that the Company regards as proprietary. There can
be no assurance that the Company's competitors will not independently develop
technologies that are substantially equivalent or superior to the Company's
technologies. Policing unauthorized use of the Company's products is difficult,
and while the Company is unable to determine the extent to which software piracy
of its products exists, software piracy can be expected to be a persistent
problem. In addition, effective protection of intellectual property rights may
be unavailable or limited in certain countries. The status of United States
patent protection in the software industry is not well defined and will evolve
as the United States Patent and Trademark Office grants additional patents.
Patents have been granted on fundamental technologies in software, and patents
may issue that relate to fundamental technologies incorporated into the
Company's products.
 
     As the number of patents, copyrights, trademarks and other intellectual
property rights in the Company's industry increases, products based on its
technology may increasingly become the subject of infringement claims. There can
be no assurance that third parties will not assert infringement claims against
the Company in the future. Any such claims with or without merit could be time
consuming, result in costly litigation, cause product shipment delays or require
the Company to enter into royalty or licensing agreements. Such royalty or
licensing agreements, if required, might not be available on terms acceptable to
the Company, or at all, which could have a material adverse effect on the
Company's business, financial condition and results of operations. In addition,
the Company may initiate claims or litigation against third parties for
infringement of the Company's proprietary rights or to establish the validity of
the Company's proprietary rights. Litigation to determine the validity of any
claims, whether or not such litigation is determined in favor of the Company,
could result in significant expense to the Company and divert the efforts of the
Company's technical and management personnel from productive tasks. In the event
of an adverse ruling in any such litigation, the Company might be required to
pay substantial damages, discontinue the use and sale of infringing products,
expend
 
                                       29
<PAGE>   31
 
significant resources to develop non-infringing technology or obtain licenses to
infringing technology. The failure of the Company to develop or license a
substitute technology could have a material adverse affect on the Company's
business, financial condition and results of operations.
 
     The Company licenses certain software development tool products from other
companies to distribute with its own products. The inability of such third
parties to provide competitive products with adequate features and high quality
on a timely basis or to provide sales and marketing cooperation could have a
material adverse effect on the Company's business, financial condition and
results of operations. In addition, the Company's products compete with products
produced by certain of the Company's licensors. There can be no assurance that,
upon the termination or expiration of these licenses, such licenses will be
available on reasonable terms or at all, or that similar products could be
obtained to substitute into the tool suites. The inability to license such
products could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
BACKLOG
 
     The Company generally ships its products within 30 days after acceptance of
a customer purchase order and, therefore, has insignificant product backlog. The
insignificant product backlog makes it difficult to predict with accuracy
quarterly revenue and quarterly earnings prior to the end of a quarterly
reporting period. Engineering services backlog, consisting of orders for
engineering services scheduled to be performed within the following twelve
months, was approximately $2.1 million, $4.1 million and $7.2 million at
February 28, 1994, 1995 and 1996, respectively. Most of the contracts with the
Company's engineering services customers are terminable at the convenience of
the customer. Although the Company has not experienced any material
cancellations in the past, there can be no assurance that such cancellations
will not occur in the future.
 
EMPLOYEES
 
     As of February 28, 1996, the Company employed 416 persons, including 155 in
marketing, sales and support services, 189 in engineering (62 in engineering
services and 127 in product development) and 72 in management, administration
and finance. Of these employees, 345 are located in the United States and 71 are
located at the Company's subsidiaries and sales offices outside of the United
States. In addition, from time to time the Company employs temporary employees
and consultants. None of the Company's employees is represented by a labor union
or is the subject of a collective bargaining agreement. The Company has never
experienced a work stoppage and believes that its employee relations are good.
The Company believes its future success will depend in large part upon its
ability to attract and retain highly skilled managerial, engineering, sales,
marketing and operations personnel, many of whom are in great demand.
Competition for such personnel has intensified dramatically over the last twelve
months in Santa Clara County, California, where the Company is headquartered,
and there can be no assurance that the Company will be successful in attracting
and retaining such personnel. See "Risk Factors--Dependence on Key Personnel;
Need for Additional Personnel."
 
FACILITIES
 
     The Company's principal offices are located in two buildings in Santa
Clara, California covering approximately 60,000 square feet. The Company
occupies this space under lease agreements that expire in September 1996. The
annual base rental payment for this space (not including operating expenses,
insurance, property taxes and assessment) is approximately $700,000. The Company
also leases a number of additional offices in North America, Europe, Asia and
Israel.
 
     In March 1996, the Company purchased for approximately $12.0 million in
cash a building in Sunnyvale, California covering approximately 150,000 square
feet. By the end of the first quarter of fiscal 1997, the Company expects to
move its operations to this space from the two buildings in Santa Clara and
terminate its obligations under the lease agreements. The Company will occupy
approximately 100,000 square feet of this facility and lease the remaining space
for approximately two years. There can be no assurance that the move will not
disrupt the Company's operations or affect the Company's operating results over
the near term.
 
                                       30
<PAGE>   32
 
                                   MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
     The executive officers and directors of the Company and their respective
ages and positions are as follows:
 
<TABLE>
<CAPTION>
                  NAME                    AGE                      POSITION
- ----------------------------------------  ---   -----------------------------------------------
<S>                                       <C>   <C>
Narendra K. Gupta.......................  47    Chairman of the Board of Directors and
                                                Secretary
David P. St. Charles....................  47    President, Chief Executive Officer and Director
Joseph Addiego..........................  40    Vice President, North American Sales
Robert M. Dressler......................  56    Vice President, Advanced Systems Group
Hamid Mirab.............................  34    Vice President, European Operations
Steven Sipowicz.........................  43    Vice President, Finance and Chief Financial
                                                Officer
David E. Stepner........................  51    Vice President, Research and Development
Tony Tolani.............................  50    Vice President, Far East Operations
Janice Waterman.........................  36    Vice President, Human Resources and Operations
John C. Bolger(1)(2)....................  49    Director
Vinita Gupta(1).........................  45    Director
Thomas Kailath(1).......................  60    Director
Richard C. Murphy(2)....................  51    Director
</TABLE>
 
- ------------------------------
(1) Member of the Compensation Committee.
 
(2) Member of the Audit Committee.
 
     Each director will hold office until the next Annual Meeting of
Shareholders and until his successor is elected and qualified or until his
earlier resignation or removal. Each officer serves at the discretion of the
Board of Directors.
 
     Dr. Gupta is a founder of the Company and has been a director of the
Company since its formation in 1980. He has been the Chairman of the Board of
the Company since March 1993 and Secretary since September 1989. Dr. Gupta was
Chief Executive Officer from 1988 to May 1994 and President from the Company's
formation in 1980 to May 1994. He was elected a Fellow of the Institute of
Electrical and Electronic Engineers (the "IEEE") in November 1991. Dr. Gupta is
currently also a director of Digital Link Corporation, a data communications and
wide-area networking equipment manufacturer, and Simulation Sciences, Inc., a
developer of chemical simulation software. Dr. Gupta holds an M.S. in
Engineering from the California Institute of Technology and a Ph.D. in
Engineering from Stanford University. He is Vinita Gupta's husband.
 
     Mr. St. Charles joined the Company in August 1993 and was appointed
President and Chief Executive Officer of the Company in May 1994. He has been a
director since he joined the Company in August 1993. From April 1990 until
August 1993, Mr. St. Charles served as President and a director of Wind River
Systems, Inc., a real-time software company. He holds a B.A. in Liberal Arts and
an M.A. in International Economics from Carleton University and an M.S. from the
Sloan School of Management at the Massachusetts Institute of Technology.
 
     Mr. Addiego has been Vice President, North American Sales of the Company
since March 1994. Since joining the Company in April 1986, he has held a variety
of positions in marketing and sales, including Vice President, Sales, Design
Automation Group from January 1992 until March 1994. Prior to joining the
Company, he was employed by the Hewlett-Packard Company and American Tele-
 
                                       31
<PAGE>   33
 
phone & Telegraph Company in technical support and sales positions. Mr. Addiego
holds a B.S. in Computer Engineering from San Francisco State University.
 
     Dr. Dressler has been Vice President, Advanced Systems Group since he
joined the Company in February 1991. Prior to joining the Company, Dr. Dressler
was employed for approximately 16 years by ESL Inc., a defense, aerospace and
electrical systems company, most recently as Manager, Aerospace Systems
Laboratory. He has also been employed by Systems Control Inc., a computer
services company, and Stanford Research Institute in a variety of technical
management and engineering research positions. Dr. Dressler holds a B.S. in
Electrical Engineering from Rensselaer Polytechnic Institute and an M.S. and a
Ph.D., both in Electrical Engineering, from Stanford University.
 
     Dr. Mirab joined the Company in November 1989 and has been Vice President,
European Operations since October 1995. From November 1989 to September 1992,
Dr. Mirab served as Manager, Technical Support in the United Kingdom, and from
September 1992 to February 1995 as Managing Director of the Company's United
Kingdom subsidiary. From February 1995 to October 1995, he served as General
Manager, European Operations. Dr. Mirab holds a B.S. in General Engineering and
a Ph.D. in Control Systems from the University of Glasgow.
 
     Mr. Sipowicz joined the Company in January 1992 and has been Vice
President, Finance of the Company since April 1993 and Chief Financial Officer
of the Company since September 1994. From January 1992 to April 1993, he served
as the Company's Corporate Controller. Prior to joining the Company, Mr.
Sipowicz spent 17 years in various management positions with Coopers & Lybrand,
an accounting firm, in the United Kingdom and United States. He holds a B.S. in
Chemistry from the University of Bristol in the United Kingdom. Mr. Sipowicz is
a certified public accountant.
 
     Dr. Stepner has been Vice President, Research and Development since he
joined the Company in December 1993. From April 1984 until March 1993, he served
as Founder, President and Chief Executive Officer of Greyhawk Systems, Inc., a
manufacturer of high resolution liquid crystal displays. In March 1993, Greyhawk
Systems, Inc. was sold to AmPro Corporation and Dr. Stepner served as Executive
Vice President of AmPro Corporation and General Manager of the AmPro/Greyhawk
Division from March 1993 until December 1993. Dr. Stepner holds a B.S. in
General Engineering from Brown University and an M.S. and a Ph.D., both in
Electrical Engineering, from Stanford University.
 
     Dr. Tolani has been Vice President, Far East Operations since he joined the
Company in December 1994. From 1973 to September 1994, he was employed by
Structural Dynamics Research Corporation, a mechanical design software company,
most recently as Vice President and General Manager, Far East Operations. Dr.
Tolani holds a B.S. in Mechanical Engineering from Birla College of Engineering
in India and an M.S. and a Ph.D., both in Mechanical Engineering, from the
University of Missouri.
 
     Ms. Waterman joined the Company in July 1995 as Vice President, Human
Resources and has served as Vice President, Human Resources and Operations of
the Company since March 1996. From September 1994 to July 1995, she served as
Vice President, Human Resources and Administration for Salick Health Care Inc.,
a health care provider. From May 1991 until September 1994, Ms. Waterman was
Vice President of Human Resources and Administration of Tekelec, Inc., a
telecommunications company. Ms. Waterman holds a B.A. in Sociology and Economics
from the University of California at Davis and an M.S. in Industrial Psychology
from California State University, Hayward.
 
     Mr. Bolger has been a director of the Company since July 1993. He served as
Vice President, Finance and Administration, and Secretary of Cisco Systems,
Inc., a networking software company, from 1989 until his retirement in 1992. Mr.
Bolger is currently also a director of Integrated Device Technology, Inc., a
semiconductor manufacturer, TCSI, a communication software company, and Sanmina
Corporation, a backplane and contract assembly manufacturer. He holds a B.A. in
English Literature from the University of Massachusetts and an M.B.A. from
Harvard University.
 
                                       32
<PAGE>   34
 
     Mrs. Gupta has been a director of the Company since its formation in 1980.
Since May 1985, she has served as Chairperson of the Board and Chief Executive
Officer of Digital Link Corporation, a data-communications and wide-area
networking equipment manufacturer. Mrs. Gupta holds an M.S. in Electrical
Engineering from the University of California, Los Angeles. She is Narendra K.
Gupta's spouse.
 
     Dr. Kailath is a founder of the Company and has been a director of the
Company since its formation in 1980. He served as Vice Chairman of the Board of
Directors from January 1990 to March 1993 and Chairman of the Board of Directors
from April 1980 to January 1990. He is currently the Hitachi America Professor
of Engineering at Stanford University, where he has been on the faculty since
January 1963. Dr. Kailath is a member of the National Academy of Engineering,
the American Academy of Arts and Sciences and a Fellow of the IEEE. He holds an
M.S. and a Sc.D., both in Electrical Engineering, from the Massachusetts
Institute of Technology.
 
     Mr. Murphy has been a director of the Company since December 1994. He is a
self-employed business consultant. Mr. Murphy is currently also a director of
Objectivity, Inc., an object database software company, and iXOS Software, Inc.,
a distributor of image management software. He holds a B.S. in Mechanical
Engineering from the University of Illinois and an M.B.A. from Northwestern
University.
 
                                       33
<PAGE>   35
 
                              SELLING SHAREHOLDERS
 
     The following table sets forth certain information with respect to
beneficial ownership of the Company's Common Stock as of April 10, 1996, and as
adjusted to reflect the sale of the shares offered by this Prospectus, by each
Selling Shareholder. Except as indicated in the footnotes to this table, the
persons and entities named in the table have sole voting and sole investment
power with respect to all shares beneficially owned by them, subject to
community property laws.
 
<TABLE>
<CAPTION>
                                                 SHARES BENEFICIALLY               SHARES BENEFICIALLY
                                                   OWNED PRIOR TO                      OWNED AFTER
                                                     OFFERING(1)       NUMBER OF       OFFERING(1)
                                                 -------------------    SHARES     -------------------
                     NAME                         NUMBER     PERCENT    OFFERED     NUMBER     PERCENT
- -----------------------------------------------  ---------   -------   ---------   ---------   -------
<S>                                              <C>         <C>       <C>         <C>         <C>
Narendra K. and Vinita Gupta(2)................  6,116,958     28.6%   1,020,000   5,096,958     23.3%
Marco Thompson(3)..............................    377,432      1.8      120,000     257,432      1.2
David P. St. Charles(4)........................    183,314        *      160,000      23,314        *
</TABLE>
 
- ------------------------------
  * Less than 1%
 
(1) Percent ownership is based on 21,352,502 shares of Common Stock outstanding
    as of April 10, 1996 prior to the offering and 21,865,650 shares outstanding
    after the offering. Options to purchase shares of Common Stock that are
    exercisable within 60 days of April 10, 1996 are deemed to be outstanding
    and to be beneficially owned by the persons holding such options for the
    purpose of computing the percentage ownership of such person but are not
    deemed to be outstanding for the purpose of the computing the percentage of
    ownership of any other person.
 
(2) Represents (i) 5,090,200 shares of Common Stock held of record by Dr. and
    Mrs. Gupta, (ii) 1,000,000 shares held of record by them, together with a
    third party, as trustees for their children, as to which they disclaim
    beneficial ownership, (iii) 7,800 shares held by Dr. Gupta as custodian for
    his daughter under the Uniform Gifts to Minors Act, as to which he disclaims
    beneficial ownership and (iv) 18,958 shares subject to options held by Mrs.
    Gupta that are exercisable within 60 days of April 10, 1996. Dr. Gupta is
    Chairman of the Board and Secretary of the Company and Mrs. Gupta is a
    director of the Company. If the Underwriters' over-allotment option to
    purchase up to 270,000 shares from Dr. and Mrs. Gupta is exercised, the
    total number of shares offered by them will be 1,290,000 and the shares
    beneficially owned after the offering will be 4,826,958, or 22.1% of the
    shares outstanding after the offering.
 
(3) Includes 3,922 shares subject to options held by Mr. Thompson that are
    exercisable within 60 days of April 10, 1996. Mr. Thompson is President of
    Doctor Design.
 
(4) Includes 179,416 shares subject to options held by Mr. St. Charles that are
    exercisable within 60 days of April 10, 1996. In addition, Mr. St. Charles
    holds options to purchase 168,084 shares that will vest in the future. Mr.
    St. Charles is the President, Chief Executive Officer and a director of the
    Company.
 
                                       34
<PAGE>   36
 
                                  UNDERWRITING
 
     Subject to the terms and conditions of the Underwriting Agreement,
Hambrecht & Quist LLC and Wessels, Arnold & Henderson, L.L.C. (the
"Underwriters") have severally agreed to purchase from the Company and the
Selling Shareholders the following respective number of shares of Common Stock.
 
<TABLE>
<CAPTION>
                                                                                NUMBER OF
                                   UNDERWRITER                                    SHARES
    --------------------------------------------------------------------------  ----------
    <S>                                                                         <C>
    Hambrecht & Quist LLC.....................................................
    Wessels, Arnold & Henderson, L.L.C. ......................................
                                                                                 ---------
              Total...........................................................   1,800,000
                                                                                 =========
</TABLE>
 
     The Underwriting Agreement provides that the obligations of the
Underwriters are subject to certain conditions precedent, including the absence
of any material adverse change in the Company's business and the receipt of
certain certificates, opinions and letters from the Company and its counsel and
independent auditors. The nature of the Underwriters' obligation is such that
they are committed to purchase all shares of Common Stock offered hereby if any
of such shares are purchased.
 
     The Underwriters propose to offer the shares of Common Stock directly to
the public at the offering price set forth on the cover page of this Prospectus
and to certain dealers at such price less a concession not in excess of $
per share. The Underwriters may allow and such dealers may reallow a concession
not in excess of $     per share to certain other dealers. After the public
offering of the shares, the offering price and other selling terms may be
changed by the Underwriters.
 
     One Selling Shareholder has granted to the Underwriters an option,
exercisable no later than 30 days after the date of this Prospectus, to purchase
up to 270,000 additional shares of Common Stock at the public offering price,
less the underwriting discount, set forth on the cover page of this Prospectus.
To the extent that the Underwriters exercise this option, each of the
Underwriters will have a firm commitment to purchase approximately the same
percentage thereof which the number of shares of Common Stock to be purchased by
it shown in the above table bears to the total number of shares of Common Stock
offered hereby. The Selling Shareholder will be obligated, pursuant to the
option, to sell such shares to the Underwriters to the extent the option is
exercised. The Underwriters may exercise such option only to cover
over-allotments made in connection with the sale of the shares of Common Stock
offered hereby.
 
     The offering of the shares is made for delivery when, as and if accepted by
the Underwriters and subject to prior sale and to withdrawal, cancellation or
modification of the offering without notice. The Underwriters reserve the right
to reject an order for the purchase of shares in whole or in part.
 
     The Company and the Selling Shareholders have agreed to indemnify the
Underwriters against certain liabilities, including liabilities under the
Securities Act, and to contribute to payments the Underwriters may be required
to make in respect thereof.
 
     The Selling Shareholders and a director have agreed that they will not,
without the prior written consent of Hambrecht & Quist LLC, sell, offer,
contract to sell, make any short sale, pledge, sell any option or contract to
purchase, purchase any option or contract to sell, grant any option, right or
warrant to purchase or otherwise transfer or dispose of any shares of Common
Stock or any securities convertible into or exchangeable or exercisable for or
any rights to purchase or acquire Common Stock or enter into any swap or other
agreement that transfers, in whole or in part, any of the economic consequences
or ownership of Common Stock owned by them during the 90-day period following
the date of this Prospectus.
 
                                       35
<PAGE>   37
 
     In general, the rules of the Commission will prohibit the Underwriters from
making a market in the Company's Common Stock during the "cooling off" period
immediately preceding the commencement of sales in the offering. The Commission
has, however, adopted exemptions from these rules that permit passive market
making under certain conditions. These rules permit an underwriter to continue
to make a market subject to the conditions, among others, that its bid not
exceed the highest bid by a market maker not connected with the offering and
that its net purchases on any one trading day not exceed prescribed limits.
Pursuant to these exemptions, the Underwriters, selling group members (if any)
or their respective affiliates intend to engage in passive market making in the
Company's Common Stock during the cooling off period.
 
                                 LEGAL MATTERS
 
     The validity of the issuance of the shares of Common Stock offered hereby
will be passed upon for the Company and the Selling Shareholders by Fenwick &
West LLP, Palo Alto, California. Certain legal matters in connection with this
offering will be passed upon for the Underwriters by Morrison & Foerster LLP,
Palo Alto, California.
 
                                    EXPERTS
 
     The consolidated balance sheets of the Company as of February 28, 1995 and
1996, and the consolidated statements of income, shareholders' equity and cash
flows for each of the three years in the period ended February 28, 1996,
included in this Prospectus and Registration Statement, have been included
herein in reliance on the report of Coopers & Lybrand L.L.P., independent
accountants, given upon the authority of that firm as experts in accounting and
auditing.
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Exchange
Act and in accordance therewith files reports, proxy statements and other
information with the Commission. Such reports, proxy statements and other
information can be inspected and copied at the public reference facilities
maintained by the Commission at Room 1024, 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C. 20549, and at the Commission's following Regional
Offices: Suite 1400, Northwest Atrium Center, 500 West Madison Street, Chicago,
Illinois 60661; and 13th Floor, Seven World Trade Center, New York, New York
10048. Copies of such material can be obtained at prescribed rates from the
Public Reference Section of the Commission at 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C. 20549. The Company's Common Stock is quoted for trading
on the Nasdaq National Market and reports, proxy statements and other
information concerning the Company may also be inspected at the offices of the
National Association of Securities Dealers, 1735 K Street, N.W., Washington,
D.C. 20006.
 
     The Company has filed with the Commission a Registration Statement on Form
S-3 (referred to herein, together with all amendments and exhibits, as the
"Registration Statement") under the Securities Act of 1933, as amended, with
respect to the securities offered by this Prospectus. This Prospectus does not
contain all of the information set forth in the Registration Statement, certain
parts of which have been omitted in accordance with the rules and regulations of
the Commission. For further information with respect to the Company and the
securities offered hereby, reference is made to the Registration Statement.
Statements made in this Prospectus as to the contents of any contract or other
document referred to herein are not necessarily complete and in each instance in
which a copy of such contract is filed as an exhibit to the Registration
Statement, reference is made to such copy, and each such statement shall be
deemed qualified in all respects by such reference. Copies of the Registration
Statement may be inspected, without charge, at the offices of the Commission, or
obtained at prescribed rates from the Public Reference Section of the Commission
at the address set forth above.
 
                                       36
<PAGE>   38
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
The Board of Directors and Shareholders
Integrated Systems, Inc.:
 
     We have audited the accompanying consolidated balance sheets of Integrated
Systems, Inc. as of February 28, 1995 and 1996 and the related consolidated
statements of income, shareholders' equity and cash flows for each of the three
years in the period ended February 28, 1996. 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 consolidated financial statements referred to above
present fairly, in all material respects, the consolidated financial position of
Integrated Systems, Inc. as of February 28, 1995 and 1996, and the consolidated
results of its operations and its cash flows for each of the three years in the
period ended February 28, 1996 in conformity with generally accepted accounting
principles.
 
                                          COOOPERS & LYBRAND L.L.P.
 
San Jose, California
March 27, 1996
 
                                       F-1
<PAGE>   39
 
                            INTEGRATED SYSTEMS, INC.
 
                          CONSOLIDATED BALANCE SHEETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                      FEBRUARY 28,
                                                                                  ---------------------
                                                                                   1995          1996
                                                                                  -------       -------
<S>                                                                               <C>           <C>
ASSETS
Current assets:
  Cash and cash equivalents.....................................................  $ 7,746       $21,822
  Marketable securities.........................................................    6,472        12,231
  Accounts receivable, net of allowance for doubtful accounts of $629 and
     $852 in 1995 and 1996, respectively........................................   15,475        19,822
  Deferred income taxes.........................................................    1,595           373
  Prepaid expenses and other....................................................    2,793         3,587
                                                                                  -------       -------
          Total current assets..................................................   34,081        57,835
Marketable securities...........................................................   22,299        15,423
Property and equipment, net.....................................................    3,613         5,593
Intangible assets, net..........................................................    5,466         2,106
Deferred income taxes...........................................................                  1,906
Other assets....................................................................      642         2,401
                                                                                  -------       -------
          Total assets..........................................................  $66,101       $85,264
                                                                                  =======       =======
                                  LIABILITIES
Current liabilities:
  Accounts payable..............................................................  $ 2,092       $ 4,309
  Accrued payroll and related expenses..........................................    2,331         3,673
  Other accrued liabilities.....................................................    3,257         4,842
  Income taxes payable..........................................................    2,354         4,191
  Deferred revenue..............................................................    6,264         9,389
                                                                                  -------       -------
          Total current liabilities.............................................   16,298        26,404
Deferred income taxes...........................................................      790
Other liabilities...............................................................    1,065           584
                                                                                  -------       -------
          Total liabilities.....................................................   18,153        26,988
                                                                                  -------       -------
Commitments (Note 6).
                              SHAREHOLDERS' EQUITY
Preferred stock, no par value, 5,000 shares authorized:
  Issued and outstanding: none in 1995 and 1996
Common stock, no par value, 50,000 shares authorized:
  Issued and outstanding: 19,722 and 21,206 shares in 1995 and 1996,
     respectively...............................................................   35,688        40,283
Unrealized holding gain (loss) on marketable securities, net....................     (109)          333
Retained earnings...............................................................   12,369        17,660
                                                                                  -------       -------
          Total shareholders' equity............................................   47,948        58,276
                                                                                  -------       -------
          Total liabilities and shareholders' equity............................  $66,101       $85,264
                                                                                  =======       =======
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-2
<PAGE>   40
 
                            INTEGRATED SYSTEMS, INC.
 
                       CONSOLIDATED STATEMENTS OF INCOME
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                    YEAR ENDED FEBRUARY 28,
                                                                -------------------------------
                                                                 1994        1995        1996
                                                                -------     -------     -------
<S>                                                             <C>         <C>         <C>
Revenue:
  Product.....................................................  $26,350     $34,952     $51,597
  Services....................................................   19,433      23,102      32,845
                                                                -------     -------     -------
          Total revenue.......................................   45,783      58,054      84,442
                                                                -------     -------     -------
Costs and expenses:
  Cost of product revenue.....................................    4,986       5,980       9,046
  Cost of services revenue....................................    8,262       9,547      15,824
  Marketing and sales.........................................   16,515      20,565      27,209
  Research and development....................................    5,926       8,341      11,379
  General and administrative..................................    3,567       4,311       6,637
  Amortization of intangible assets...........................    1,764       1,311         556
  Acquisition and other.......................................                            7,327
                                                                -------     -------     -------
          Total costs and expenses............................   41,020      50,055      77,978
                                                                -------     -------     -------
               Income from operations.........................    4,763       7,999       6,464
Interest and other income.....................................    1,258       1,601       2,331
                                                                -------     -------     -------
               Income before income taxes.....................    6,021       9,600       8,795
Provision for income taxes....................................    1,935       3,110       3,512
                                                                -------     -------     -------
               Net income.....................................  $ 4,086     $ 6,490     $ 5,283
                                                                =======     =======     =======
Earnings per share............................................  $  0.21     $  0.33     $  0.24
                                                                =======     =======     =======
Shares used in per share calculations.........................   19,122      19,964      22,088
                                                                =======     =======     =======
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-3
<PAGE>   41
 
                            INTEGRATED SYSTEMS, INC.
 
                CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                      UNREALIZED
                                                 COMMON STOCK          HOLDING
                                              ------------------     GAIN (LOSS),   RETAINED
                                              SHARES     AMOUNT          NET        EARNINGS    TOTAL
                                              ------     -------     ------------   --------   -------
<S>                                           <C>        <C>         <C>            <C>        <C>
Balances, February 28, 1993.................  17,774     $29,699                    $  2,748   $32,447
  Exercise of common stock options..........     469         572                                   572
  Common stock purchased under Employee
     Stock Purchase Plan....................     120         312                                   312
  Amortization of deferred compensation.....                 242                                   242
  Tax benefit from disqualifying
     dispositions of common stock...........                 372                                   372
  Pooling of interests with Doctor Design...     614          79                        (291)     (212)
  Note receivable from shareholder..........                 (14)                                  (14)
  Unrealized holding gain on marketable
     securities, net........................                            $  227                     227
  Net income................................                                           4,086     4,086
                                              ------     -------         -----       -------   -------
Balances, February 28, 1994.................  18,977      31,262           227         6,543    38,032
  Exercise of common stock options..........     585       1,858                                 1,858
  Common stock purchased under Employee
     Stock Purchase Plan....................      94         420                                   420
  Amortization of deferred compensation.....                 183                                   183
  Tax benefit from disqualifying
     dispositions of common stock...........               1,009                                 1,009
  Repurchase of common stock................    (250)       (430)                       (664)   (1,094)
  Issuance of common stock in connection
     with acquisition.......................     316       1,386                                 1,386
  Unrealized holding loss on marketable
     securities, net........................                              (336)                   (336)
  Net income................................                                           6,490     6,490
                                              ------     -------         -----       -------   -------
Balances, February 28, 1995.................  19,722      35,688          (109)       12,369    47,948
  Exercise of common stock options..........     540       2,050                                 2,050
  Common stock purchased under Employee
     Stock Purchase Plan....................      72         557                                   557
  Tax benefit from disqualifying
     dispositions of common stock...........               2,323                                 2,323
  Pooling of interests with TakeFive
     Software...............................     872          50                           8        58
  Purchase of TakeFive Software common stock
     for cash...............................                (400)                                 (400)
  Payment of note receivable from
     shareholder............................                  15                                    15
  Unrealized holding gain on marketable
     securities, net........................                               442                     442
  Net income................................                                           5,283     5,283
                                              ------     -------         -----       -------   -------
Balances, February 28, 1996.................  21,206     $40,283        $  333      $ 17,660   $58,276
                                              ======     =======         =====       =======   =======
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-4
<PAGE>   42
 
                            INTEGRATED SYSTEMS, INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                             YEAR ENDED FEBRUARY 28,
                                                                        ---------------------------------
                                                                          1994        1995         1996
                                                                        --------     -------     --------
<S>                                                                     <C>          <C>         <C>
Cash flows from operating activities:
  Net income..........................................................  $  4,086     $ 6,490     $  5,283
  Adjustments to reconcile net income to net cash provided by
     operating activities:
     Depreciation and amortization....................................     3,868       3,584        4,103
     Write-down of intangible assets..................................                              3,083
     Deferred income taxes............................................        (2)       (558)      (1,768)
     Changes in assets and liabilities:
       Accounts receivable............................................    (1,661)     (5,321)      (4,347)
       Prepaid expenses and other.....................................      (658)     (1,171)        (794)
       Accounts payable, accrued payroll and other accrued
        liabilities...................................................       844       2,201        5,255
       Income taxes payable...........................................       635       1,979        4,160
       Deferred revenue...............................................     1,058         640        3,125
       Other assets and liabilities...................................      (687)        (68)         375
                                                                        --------     -------     --------
          Net cash provided by operating activities...................     7,483       7,776       18,475
                                                                        --------     -------     --------
Cash flows from investing activities:
  Purchases of marketable securities..................................   (11,633)     (8,041)     (16,878)
  Maturities of marketable securities.................................     7,234       3,593       18,731
  Additions to property and equipment.................................    (1,448)     (2,089)      (4,332)
  Disposals of property and equipment.................................       128          46          149
  Capitalized software development costs..............................    (1,132)       (492)        (335)
  Net cash paid in acquisitions.......................................      (117)     (2,081)      (2,885)
  Other...............................................................                  (200)        (480)
                                                                        --------     -------     --------
          Net cash used in investing activities.......................    (6,968)     (9,264)      (6,030)
                                                                        --------     -------     --------
Cash flows from financing activities:
  Repurchase of common stock..........................................                (1,094)
  Proceeds from exercise of common stock options and purchases under
     Employee Stock Purchase Plan.....................................       884       2,278        2,607
  Other...............................................................      (210)       (223)        (976)
                                                                        --------     -------     --------
          Net cash provided by financing activities...................       674         961        1,631
                                                                        --------     -------     --------
Net increase (decrease) in cash and cash equivalents..................     1,189        (527)      14,076
Cash and cash equivalents at beginning of year........................     7,084       8,273        7,746
                                                                        --------     -------     --------
Cash and cash equivalents at end of year..............................  $  8,273     $ 7,746     $ 21,822
                                                                        ========     =======     ========
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
  Cash paid during the year for income taxes, net.....................  $  2,056     $ 1,741     $    700
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING ACTIVITIES:
  Increase in carrying amount of purchased intangible assets upon
     adoption of Financial Accounting Standards No. 109, "Accounting
     for Income Taxes"................................................  $    767
  Unrealized holding gain (loss) on marketable securities.............  $    379     $  (560)    $    736
SUPPLEMENTAL SCHEDULE OF NONCASH FINANCING ACTIVITIES:
  Tax benefit from disqualifying dispositions of common stock.........  $    372     $ 1,009     $  2,323
  Issuance of common stock in connection with acquisition (Note 2)....               $ 1,386
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                       F-5
<PAGE>   43
 
                            INTEGRATED SYSTEMS, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
NATURE OF OPERATIONS
 
     Integrated Systems, Inc. (the Company) designs, develops, markets and
supports software products for embedded microprocessor-based applications and
also provides related engineering services. Embedded microprocessors are used to
add functionality and intelligence to a variety of products and to operate as an
integral part of these products, generally without any direct human
intervention. The Company offers software that consists of a real-time operating
system and a series of modules and design tools that aid the development of
embedded applications. The Company markets and supports its products and
provides services on a worldwide basis to a variety of users in a broad range of
industries, including telecommunications and data communications, automotive,
multimedia and consumer, and office and industrial automation, as well as in the
embedded Internet market, through a direct sales force augmented by a
telemarketing organization, distributors and sales representatives.
 
PRINCIPLES OF CONSOLIDATION
 
     The consolidated financial statements include the accounts of Integrated
Systems, Inc. and its wholly owned subsidiaries. All significant intercompany
accounts and transactions have been eliminated. Investments in affiliated
companies that are not controlled are carried at cost plus the Company's equity
in undistributed earnings since acquisition (see Note 2).
 
USE OF ESTIMATES
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the dates of the financial
statements and the reported amounts of revenues and expenses during a reporting
period. Actual results could differ from those estimates.
 
CASH AND CASH EQUIVALENTS
 
     Cash and cash equivalents, which are held at a variety of financial
institutions, include demand deposits, money market accounts and all highly
liquid debt instruments with an original or remaining maturity at the date of
purchase of three months or less. The Company has not experienced any material
losses relating to any investment instruments.
 
FAIR VALUE OF FINANCIAL INSTRUMENTS
 
     The amounts reported for cash equivalents, accounts receivable, accounts
payable and accrued liabilities are considered to approximate fair values based
upon comparable market information available at February 28, 1996. Based upon
interest rates available to the Company for debt with comparable maturities, the
carrying values of the Company's notes payable approximate fair values. The fair
values of the Company's marketable securities are set forth in Note 3.
 
     Financial instruments that potentially subject the Company to
concentrations of credit risks comprise, principally, cash, cash equivalents,
investments and trade accounts receivable. The Company invests its excess cash
in government securities, tax exempt municipal securities, preferred stock,
Eurodollar notes and bonds, time deposits, certificates of deposit, commercial
paper rated Aa or better and other specific money market and corporate
instruments of similar liquidity and credit quality. The Company performs
ongoing evaluations of its customers' financial condition and does not require
 
                                       F-6
<PAGE>   44
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
collateral. The Company maintains allowances for potential credit losses and
such losses have been within management's expectations.
 
MARKETABLE SECURITIES
 
     All marketable securities are classified as available-for-sale and
therefore are carried at fair value. Marketable securities classified as current
assets have scheduled maturities of less than one year, while marketable
securities classified as noncurrent assets have scheduled maturities of more
than one year. Unrealized holding gains and losses on such securities are
reported net of related taxes as a separate component of shareholders' equity.
Realized gains and losses on sales of all such securities are reported in
interest and other income and computed using the specific identification cost
method.
 
REVENUE RECOGNITION
 
  Product Revenue
 
     Product revenue consists principally of revenue from product licensing
fees. Product licensing fees, including advanced production royalty payments,
are generally recognized when a customer purchase order has been received, a
license agreement has been executed, the software has been shipped, remaining
obligations are insignificant and collection of the resulting account receivable
is probable. Generally, the Company's distributors do not have the right of
return. Provisions for estimated product returns, warranty costs and
insignificant vendor obligations are recorded at the time products are shipped.
 
  Services Revenue
 
     Services revenue consists principally of maintenance and renewal fees for
providing product updates, technical support and related services for software
products, and engineering and consulting services fees. Software maintenance
revenue bundled with the initial product license revenue is deferred and
recognized ratably over the related service period. The Company unbundles a
portion of its initial product license revenue related to software maintenance
revenue based upon product license renewal amounts, which are substantially less
than the initial product license fee, or based upon the amount charged for such
services when they are sold separately. License renewal fees, which are
substantially less than the initial license, are deferred and recognized ratably
over the license term. Revenue from separately sold maintenance contracts is
recognized ratably over the related service period. Engineering and consulting
services revenue from short-term and long-term contracts is generally recognized
on the percentage-of-completion method. For cost reimbursement and firm fixed
price contracts, revenues are recognized as the work is performed, based on the
ratio of incurred costs to estimated total completion costs. For
time-and-material contracts, revenues are recognized on the basis of direct
labor hours and other direct costs incurred. Provisions for anticipated losses
are made in the period in which they first become determinable.
 
PROPERTY AND EQUIPMENT
 
     Property and equipment are recorded at cost. Depreciation is computed using
the straight-line method over the estimated useful lives of the respective
assets (three to twenty years). Leasehold improvements are amortized over the
lease term or the estimated useful life of the asset, whichever is shorter.
 
                                       F-7
<PAGE>   45
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
SOFTWARE DEVELOPMENT COSTS
 
     The Company capitalizes certain costs to develop computer software to be
licensed or otherwise marketed to customers. Such costs are amortized using the
greater of the amount computed using the ratio that current gross revenues for a
product bear to the total of current and anticipated future gross revenues for
that product, or on a straight-line basis over three years. Software development
costs included in intangible assets at February 28, 1995 and 1996, were
$1,763,000 and $1,177,000, respectively, net of accumulated amortization of
$822,000 and $1,743,000, respectively. Capitalized software development costs
were $1,132,000, $492,000 and $335,000 in fiscal 1994, 1995 and 1996,
respectively. Amortization, which is included in cost of product revenue, was
$160,000, $607,000 and $921,000 in fiscal 1994, 1995 and 1996, respectively.
 
INTANGIBLE ASSETS
 
     Intangible assets consist primarily of goodwill, purchased software and
capitalized software development costs. Goodwill and purchased software are
amortized on a straight-line basis over their estimated useful lives. The
Company periodically evaluates the recoverability of these costs based upon
estimated undiscounted future cash flows from the related products and
businesses acquired.
 
INCOME TAXES
 
     The Company's provision for income taxes is comprised of its current tax
liability and the change in its deferred tax assets and liabilities. Deferred
tax assets and liabilities are determined based on differences between financial
reporting and tax bases of assets and liabilities and are measured using the
enacted tax rates and laws that will be in effect when the differences are
expected to reverse.
 
ADVERTISING
 
     The Company expenses advertising costs as they are incurred. Advertising
expense for fiscal 1994, 1995 and 1996 was $409,000, $800,000 and $927,000,
respectively.
 
COMPUTATION OF EARNINGS PER SHARE
 
     Earnings per share is computed using the weighted average number of common
and common equivalent shares outstanding during the period. Common equivalent
shares result from the assumed exercise of outstanding stock options that have a
dilutive effect when applying the treasury stock method.
 
FOREIGN CURRENCY TRANSLATION
 
     The Company's foreign subsidiaries that operate as sales and marketing
offices for the Company's products, translate their financial statements using
the U.S. dollar as the functional currency. Accordingly, foreign exchange gains
and losses, which have been insignificant, are included in the consolidated
statements of income. The Company's remaining foreign subsidiaries use the local
currency as the functional currency. Accordingly, all assets and liabilities are
recorded at year-end exchange rates and income and expenses are recorded at
average rates. Adjustments resulting from the translation have been
insignificant.
 
                                       F-8
<PAGE>   46
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
FISCAL YEAR
 
     Prior to fiscal 1996, the Company's fiscal year was reported on a 52/53
week period ending on the last Saturday in February of each year. Beginning in
fiscal 1996, the Company's fiscal year end is the last day in February.
Accordingly, the fiscal year end for fiscal 1994, 1995 and 1996 was February 26,
25 and 29, respectively. The effect of this change was not material to the
Company's financial statements for the year ended February 29, 1996. For clarity
of presentation herein, all fiscal years are referred to as ending on February
28.
 
RECLASSIFICATIONS
 
     Certain prior year amounts have been reclassified to conform to the current
year presentation.
 
RECENT ACCOUNTING PRONOUNCEMENTS
 
     During March 1995, the Financial Accounting Standards Board issued
Statement No. 121, "Accounting for the Impairment of Long-Lived Assets and for
Long-Lived Assets to Be Disposed Of" (SFAS No. 121), which requires the Company
to review for impairment of long-lived assets, certain identifiable intangibles
and goodwill related to those assets whenever events or changes in circumstances
indicate that the carrying amount of an asset may not be recoverable. In certain
situations, an impairment loss would be recognized. SFAS No. 121 will be
effective for the Company's fiscal year 1997. The Company has studied the
implications of the statement and, based on its initial evaluation, does not
expect it to have a material impact on the Company's financial condition or
results of operations.
 
     During October 1995, the Financial Accounting Standards Board issued
Statement of Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation" (SFAS No. 123). This accounting standard permits the use of either
a fair value based method or the current Accounting Principals Board Opinion No.
25, "Accounting for Stock Issued to Employees" (APB No. 25) when accounting for
stock-based compensation arrangements. Companies that do not follow the new fair
value based method will be required to disclose pro forma net income and
earnings per share computed as if the fair value based method had been applied.
The disclosure provisions of SFAS No. 123 are effective for fiscal years
beginning after December 15, 1995. Management has not determined if it will
adopt the fair value based method of accounting for stock-based compensation
arrangements nor the impact of SFAS No. 123 on the Company's consolidated
financial statements.
 
2. ACQUISITIONS
 
MERGER WITH TAKEFIVE
 
     In October 1995, the Company acquired TakeFive Software GmbH (TakeFive), an
Austrian corporation by issuing 871,980 shares of its common stock in exchange
for 97% of the shares of TakeFive. The remaining 3% of the shares of TakeFive
were purchased for cash. The business combination was accounted for as a pooling
of interests and the Company's results of operations for fiscal 1996 include
those of TakeFive. The prior years' results have not been restated to include
TakeFive operations as such operations were insignificant. Prior to the business
combination, TakeFive was in the business of developing, marketing and
supporting software tools used in software development. The Company intends to
continue the business of TakeFive and operate TakeFive as an independent
subsidiary.
 
                                       F-9
<PAGE>   47
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
2. ACQUISITIONS (CONTINUED)
MERGER WITH DOCTOR DESIGN
 
     In January 1996, the Company acquired Doctor Design, Inc. (Doctor Design),
an engineering services company specializing in multimedia hardware, software
and application specific integrated circuit technology. The Company issued
743,214 shares of its common stock for substantially all the outstanding stock
of Doctor Design. The Company also assumed stock options that converted into
options to purchase 263,724 shares of the Company's common stock. The business
combination was accounted for as a pooling of interests and the consolidated
financial statements have been restated as if Doctor Design had been combined
for all periods presented. The Company intends to continue the business of
Doctor Design and operate Doctor Design as an independent subsidiary.
 
COMBINED AND SEPARATE RESULTS OF MERGERS
 
     Combined and separate results of the Company, Doctor Design and TakeFive
during the periods preceding the mergers were as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                 INTEGRATED     DOCTOR
                                                  SYSTEMS       DESIGN     TAKEFIVE     COMBINED
                                                 ----------     ------     --------     --------
    <S>                                          <C>            <C>        <C>          <C>
    Nine months ended November 30, 1995
      (unaudited):
      Net revenue..............................   $ 47,455      $9,171      $3,193      $59,819
      Net income...............................      3,134         882         580        4,596
    Year ended February 28, 1995:
      Net revenue..............................     51,979       6,075                   58,054
      Net income...............................      5,754         736                    6,490
    Year ended February 28, 1994:
      Net revenue..............................     41,701       4,082                   45,783
      Net income...............................      4,033          53                    4,086
</TABLE>
 
OTHER ACQUISITIONS
 
     In September 1994, the Company acquired certain software products and other
assets for a total purchase price of approximately $3,467,000, consisting of
$2,081,000 in cash and non-cash consideration of approximately 316,000 shares of
restricted common stock with a value of approximately $1,386,000. The
acquisition was accounted for using the purchase method of accounting and
accordingly, its operations have been included with those of the Company since
the date of acquisition. Substantially all of the purchase price was allocated
to purchased software, which prior to the third quarter of fiscal 1996, was
being amortized on a straight-line basis over a seven-year period. During the
third quarter of fiscal 1996, the Company determined that the recoverability of
the purchased software was not probable as the products purchased would be
replaced by the products acquired in the merger with TakeFive. Accordingly,
capitalized purchased software totaling $3,083,000 was charged to acquisition
and other expenses in the consolidated statement of income.
 
     In December 1995, the Company acquired certain technology, related assets
and all of the outstanding common stock of a company for $1,735,000. The
acquisition has been accounted for under the equity method of accounting and is
included in other assets in the accompanying balance sheet. The acquisition cost
exceeded the underlying equity in net assets by $1,395,000, of which $756,000,
$425,000 and $214,000 was allocated to existing software products, which had
reached technological
 
                                      F-10
<PAGE>   48
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
2. ACQUISITIONS (CONTINUED)
feasibility, goodwill and in-process software development, which had not reached
technological feasibility, respectively, based on their respective fair values.
The costs allocated to goodwill and existing products are being amortized over
periods of five and two years, respectively, and the costs allocated to
in-process software development were charged to acquisition and other expenses.
In addition to the purchase price, the Company paid bonuses to non-shareholder
management and employees totaling $1,645,000, which were expensed and are
included as part of acquisition and other expenses in the consolidated statement
of income for fiscal 1996. The operations of the acquired company are not
material to the consolidated financial statements of the Company, and
accordingly, separate financial information for this company has not been
presented.
 
ACQUISITION AND OTHER EXPENSES
 
     Acquisition and other expenses for fiscal 1996 consist of (in thousands):
 
<TABLE>
    <S>                                                                           <C>
    In-process software development costs written-off.........................    $  214
    Bonuses paid to management and employees of acquired company..............     1,645
    Purchased software written-off............................................     3,083
    Professional fees and other acquisition costs.............................     1,585
    Termination fees payable to a distributor.................................       800
                                                                                  ------
                                                                                  $7,327
                                                                                  ======
</TABLE>
 
     The termination fees payable to a distributor relate to amounts payable
resulting from the termination of the Company's reseller arrangement with a
Japanese distributor in February 1996.
 
3. MARKETABLE SECURITIES
 
     At February 28, 1995 and 1996, marketable securities consisted of
fixed-income U.S. Government securities, primarily treasury notes, municipal
securities and preferred stock, held by two investment banks.
 
     Marketable securities at February 28, 1995 are summarized below (in
thousands):
 
<TABLE>
<CAPTION>
                                                                                         UNREALIZED
                                            FAIR      COST     UNREALIZED   UNREALIZED   NET GAINS
                                            VALUE     BASIS      GAINS        LOSSES      (LOSSES)
                                           -------   -------   ----------   ----------   ----------
    <S>                                    <C>       <C>       <C>          <C>          <C>
    U.S. Government securities...........  $12,911   $13,076      $ 65        $ (230)      $ (165)
    Municipal securities.................   13,790    13,837        40           (87)         (47)
    Preferred stock......................    2,070     2,039        31                         31
                                           -------   -------      ----         -----        -----
                                           $28,771   $28,952      $136        $ (317)        (181)
                                           =======   =======      ====         =====
    Related deferred taxes...............                                                      72
                                                                                            -----
    Unrealized holding loss, net.........                                                  $ (109)
                                                                                            =====
</TABLE>
 
                                      F-11
<PAGE>   49
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
3. MARKETABLE SECURITIES (CONTINUED)
     Marketable securities at February 28, 1996 are summarized below (in
thousands):
 
<TABLE>
<CAPTION>
                                            FAIR      COST     UNREALIZED   UNREALIZED   UNREALIZED
                                            VALUE     BASIS      GAINS        LOSSES     NET GAINS
                                           -------   -------   ----------   ----------   ----------
    <S>                                    <C>       <C>       <C>          <C>          <C>
    U.S. Government securities...........  $12,678   $12,471      $221         $(14)       $  207
    Municipal securities.................   11,550    11,456        94                         94
    Preferred stock......................    3,426     3,172       254                        254
                                           -------   -------      ----         ----         -----
                                           $27,654   $27,099      $569         $(14)          555
                                           =======   =======      ====         ====
    Related deferred taxes...............                                                    (222)
                                                                                            -----
    Unrealized holding gain, net.........                                                  $  333
                                                                                            =====
</TABLE>
 
     At February 28, 1996, all marketable debt securities classified as current
assets have scheduled maturities of less than one year. Marketable debt
securities classified as noncurrent assets have scheduled maturities of one to
five years.
 
4. PROPERTY AND EQUIPMENT, NET (IN THOUSANDS):
 
<TABLE>
<CAPTION>
                                                                         FEBRUARY 28,
                                                                     ---------------------
                                                                      1995          1996
                                                                     -------       -------
    <S>                                                              <C>           <C>
    Buildings......................................................  $   908       $   908
    Furniture and fixtures.........................................    1,150         1,373
    Computer equipment.............................................    7,786        11,642
    Leasehold improvements.........................................      246           258
                                                                     -------       -------
                                                                      10,090        14,181
    Less accumulated depreciation and amortization.................   (6,477)       (8,588)
                                                                     -------       -------
                                                                     $ 3,613       $ 5,593
                                                                     =======       =======
</TABLE>
 
     Depreciation expense amounted to $1,367,000, $1,531,000 and $2,203,000 in
fiscal 1994, 1995 and 1996, respectively.
 
5. LINE OF CREDIT
 
     At February 28, 1996, the Company had available a $1,000,000 unsecured bank
line of credit and a $5,000,000 foreign exchange contract facility under an
agreement that expires on July 15, 1996. Borrowings under the line of credit
bear interest at the bank's prime rate. The agreement contains certain
restrictive covenants regarding the Company's financial position. The Company
has had no borrowings under this agreement.
 
6. LEASEHOLD COMMITMENTS
 
OPERATING LEASES
 
     The Company occupies its principal facilities under an operating lease
agreement that expires in September 1996. Under the agreement, the Company is
responsible for taxes, utilities and insurance expenses. Future minimum lease
payments under all noncancelable operating leases amount to approximately
$973,000, $361,000, $137,000, $102,000, $47,000 and $230,000 for fiscal 1997,
1998, 1999, 2000, 2001 and thereafter, respectively. Rent expense for fiscal
1994, 1995 and 1996 was $875,000, $1,148,000 and $1,455,000, respectively.
 
                                      F-12
<PAGE>   50
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
6. LEASEHOLD COMMITMENTS (CONTINUED)
BUILDING PURCHASE
 
     In March 1996, the Company purchased a building, which will become its
principal facility, for cash of approximately $12,000,000. The Company expects
the move to this new facility to be completed by the end of the first quarter of
fiscal 1997.
 
7. SHAREHOLDERS' EQUITY
 
COMMON STOCK SPLIT
 
     On March 4, 1996, the Company's Board of Directors authorized a two-for-one
stock split to be effective on April 5, 1996 for the shareholders of record on
March 18, 1996. All share and per share information in the accompanying
financial statements has been restated to give retroactive recognition to the
stock split for all periods presented.
 
COMMON STOCK OPTION PLANS
 
     At February 28, 1996, the Company had reserved 6,663,724 shares of common
stock for issuance under various stock option plans, including a plan resulting
from the business combination with Doctor Design (see Note 2). The plans provide
for the granting of incentive stock options to officers and employees of the
Company and nonqualified stock options to officers, employees, directors and
consultants of the Company at prices not less than fair market value (as
determined by the Compensation Committee of the Board of Directors) on the date
of grant. Options are exercisable at times and in increments as specified by the
Compensation Committee. Options generally vest over five years and expire in six
to ten years.
 
                                      F-13
<PAGE>   51
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
7. SHAREHOLDERS' EQUITY (CONTINUED)
     Activity under these plans is as follows (in thousands, except share and
per share amounts):
 
<TABLE>
<CAPTION>
                                                  SHARES       NUMBER
                                                AVAILABLE        OF         PRICE PER
                                                FOR GRANT      OPTIONS        SHARE         TOTAL
                                                ----------    ---------    ------------    -------
<S>                                             <C>           <C>          <C>             <C>
Balances, February 28, 1993...................   2,122,866    1,643,080    $0.32-$ 6.63    $ 4,192
  Options granted.............................  (1,561,812)   1,561,812    $0.68-$ 5.88      5,577
  Options exercised...........................                 (468,884)   $0.32-$ 4.44       (572)
  Options canceled............................     212,912     (216,112)   $0.38-$ 6.63       (748)
                                                ----------    ---------                    -------
Balances, February 28, 1994...................     773,966    2,519,896    $0.32-$ 5.88      8,449
  Adoption of 1994 Directors Stock Option
     Plan.....................................     400,000
  Shares added to 1988 Plan...................   2,000,000
  Options granted.............................    (826,164)     826,164    $0.68-$ 9.38      4,894
  Options exercised...........................                 (584,848)   $0.32-$ 5.25     (1,858)
  Options canceled............................     337,344     (337,344)   $2.63-$ 5.32     (1,227)
                                                ----------    ---------                    -------
Balances, February 28, 1995...................   2,685,146    2,423,868    $0.32-$ 9.38     10,258
  Options granted.............................    (882,272)     882,272    $1.35-$19.50     11,915
  Options exercised...........................                 (540,254)   $0.39-$ 9.38     (2,050)
  Options canceled............................     239,966     (239,966)   $2.88-$14.63     (1,419)
                                                ----------    ---------                    -------
Balances, February 28, 1996...................   2,042,840    2,525,920    $0.32-$19.50    $18,704
                                                ==========    =========                    =======
</TABLE>
 
     At February 28, 1996, options to purchase 799,630 shares of common stock
were exercisable.
 
EMPLOYEE STOCK PURCHASE PLAN
 
     At February 28, 1996, the Company had reserved a total of 1,000,000 shares
of common stock for issuance under its 1990 Employee Stock Purchase Plan (the
ESPP). The purpose of the ESPP is to provide eligible employees of the Company
with a means of acquiring common stock of the Company through payroll
deductions. The purchase price of such stock under the ESPP cannot be less than
85% of the lower of the fair market value on the specified purchase date or the
beginning of the offering period. During fiscal 1994, 1995 and 1996,
approximately 120,000 shares, 94,000 shares and 72,000 shares, respectively,
were sold through the ESPP.
 
8. 401(K) PLANS
 
     The Company has two 401(k) Plans (the Plans), including a plan resulting
from the business combination with Doctor Design (see Note 2), that cover
essentially all employees. Each eligible employee may elect to contribute to the
Plans, through payroll deductions, up to 15% of their compensation, subject to
certain limitations. The Company is obligated to make matching contributions on
behalf of each participating employee in an amount equal to 25% of an employee's
contribution, up to 2% of the employee's compensation. For individuals who were
employed by the Company prior to December 1, 1994, Company contributions are
fully vested on the date of contribution. For individuals who became employed
subsequent to November 30, 1994, Company contributions vest ratably over a
six-year period. The Company's contributions charged against income totaled
approximately $170,000, $228,000 and $390,000 in fiscal 1994, 1995 and 1996,
respectively.
 
                                      F-14
<PAGE>   52
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
9. INCOME TAXES
 
     The provision for income taxes included the following (in thousands):
 
<TABLE>
<CAPTION>
                                                                YEAR ENDED FEBRUARY 28,
                                                             ------------------------------
                                                              1994        1995       1996
                                                             -------     ------     -------
    <S>                                                      <C>         <C>        <C>
    Federal:
      Current..............................................  $ 1,851     $1,838     $ 3,211
      Deferred.............................................   (1,021)      (429)     (1,584)
                                                             -------     ------     -------
                                                                 830      1,409       1,627
                                                             -------     ------     -------
    State:
      Current..............................................      730        647       1,208
      Deferred.............................................     (252)       (58)       (593)
                                                             -------     ------     -------
                                                                 478        589         615
                                                             -------     ------     -------
    Foreign................................................      627      1,112       1,270
                                                             -------     ------     -------
                                                             $ 1,935     $3,110     $ 3,512
                                                             =======     ======     =======
</TABLE>
 
     The reconciliation between the effective tax rates and statutory federal
income tax rate is shown in the following table:
 
<TABLE>
<CAPTION>
                                                                      YEAR ENDED FEBRUARY
                                                                              28,
                                                                     ----------------------
                                                                     1994     1995     1996
                                                                     ----     ----     ----
    <S>                                                              <C>      <C>      <C>
    Statutory federal income tax rate..............................  34.0%    34.0%    34.0%
    State taxes, net of federal income tax benefit.................   5.3      4.6      5.4
    Acquisition costs..............................................                     8.0
    Research and development tax credit and credit carryforwards...  (2.9)    (1.2)    (2.0)
    Foreign sales corporation tax benefit..........................  (3.8)    (3.7)    (3.5)
    Other..........................................................  (0.5)    (1.3)    (1.9)
                                                                     ----     ----     ----
    Effective tax rate.............................................  32.1%    32.4%    40.0%
                                                                     ====     ====     ====
</TABLE>
 
     Domestic and foreign components of income before income taxes were (in
thousands):
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED FEBRUARY 28,
                                                               ----------------------------
                                                                1994       1995       1996
                                                               ------     ------     ------
    <S>                                                        <C>        <C>        <C>
    Domestic.................................................  $5,410     $8,558     $7,430
    Foreign..................................................     611      1,042      1,365
                                                               ------     ------     ------
                                                               $6,021     $9,600     $8,795
                                                               ======     ======     ======
</TABLE>
 
                                      F-15
<PAGE>   53
 
                            INTEGRATED SYSTEMS, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
9. INCOME TAXES (CONTINUED)
     The significant components of deferred tax assets and liabilities consist
of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                                          FEBRUARY 28,
                                                                       -------------------
                                                                        1995         1996
                                                                       ------       ------
    <S>                                                                <C>          <C>
    Deferred tax assets:
      Purchased intangibles..........................................               $2,572
      Tax credit carryforwards.......................................  $  778
      Accelerated depreciation.......................................     207          296
      Accrued vacation and holiday...................................     266          262
      Allowance for doubtful accounts................................     243          387
      Other..........................................................     366           58
                                                                       ------       ------
                                                                       $1,860       $3,575
                                                                       ======       ======
    Deferred tax liabilities:
      Software development costs.....................................  $  766       $  510
      Marketable securities..........................................                  222
      Cash to accrual adjustment.....................................     289          564
                                                                       ------       ------
                                                                       $1,055       $1,296
                                                                       ======       ======
</TABLE>
 
     The Company has not provided a valuation allowance for its net deferred tax
assets as it expects such amounts to be realized through taxable income from
future operations, or by carryback to prior years' taxable income.
 
10. BUSINESS SEGMENT INFORMATION
 
     The Company operates in one business segment: the design, marketing and
support of products for automating the process of real-time software development
and system design, including engineering services to assist customers in
implementing specific solutions.
 
     The Company's foreign operations primarily consist of sales and customer
service organizations. Revenue, income and assets of the Company's foreign
subsidiaries were not material to the consolidated financial statements in
fiscal 1994, 1995 and 1996.
 
     Revenue by geographical location of customer is as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                YEAR ENDED FEBRUARY 28,
                                                            --------------------------------
                                                              1994        1995        1996
                                                            --------    --------    --------
    <S>                                                     <C>         <C>         <C>
    North America.........................................  $ 32,277    $ 41,723    $ 56,109
    Europe................................................     8,734       9,541      17,028
    Asia/Pacific..........................................     4,772       6,790      11,305
                                                             -------     -------     -------
                                                            $ 45,783    $ 58,054    $ 84,442
                                                             =======     =======     =======
</TABLE>
 
     Export revenue to Europe was $5,213,000, $6,472,000 and $9,458,000 for
fiscal 1994, 1995 and 1996, respectively. Export revenue to Asia/Pacific was
$4,772,000, $6,790,000 and $11,305,000, in fiscal 1994, 1995 and 1996,
respectively.
 
     Revenue from the United States Government, which are primarily engineering
services, was approximately 11% of total revenue for fiscal 1994. No other
customer accounted for 10% or more of total revenue in the reported periods.
 
                                      F-16
<PAGE>   54
 
- ------------------------------------------------------------
- ------------------------------------------------------------
 
     NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY, ANY SELLING SHAREHOLDER
OR THE UNDERWRITERS. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A
SOLICITATION OF AN OFFER TO BUY TO ANY PERSON IN ANY JURISDICTION IN WHICH SUCH
AN OFFER OR SOLICITATION WOULD BE UNLAWFUL OR TO ANY PERSON TO WHOM IT IS
UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY OFFER OR SALE MADE
HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS
BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY OR THAT THE INFORMATION CONTAINED
HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF.
 
                               ------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                             PAGE
                                             -----
<S>                                          <C>
Incorporation of Certain Documents by
  Reference................................      2
Prospectus Summary.........................      3
Risk Factors...............................      4
Use of Proceeds............................     10
Price Range of Common Stock................     10
Dividend Policy............................     10
Capitalization.............................     11
Selected Consolidated Financial Data.......     12
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations...............................     13
Business...................................     20
Management.................................     31
Selling Shareholders.......................     34
Underwriting...............................     35
Legal Matters..............................     36
Experts....................................     36
Available Information......................     36
Report of Independent Accountants..........    F-1
Consolidated Financial Statements..........    F-2
</TABLE>
 
- ------------------------------------------------------------
- ------------------------------------------------------------
- ------------------------------------------------------------
- ------------------------------------------------------------
                                1,800,000 SHARES
                                      LOGO
 
                                  COMMON STOCK
                             ----------------------
                                   PROSPECTUS
                             ----------------------
                               HAMBRECHT & QUIST
 
                          WESSELS, ARNOLD & HENDERSON
                                  May   , 1996
 
- ------------------------------------------------------------
- ------------------------------------------------------------
<PAGE>   55
 
                                    PART II
 
                   INFORMATION NOT REQUIRED IN THE PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The following table sets forth the costs and expenses to be paid by the
Registrant in connection with the sale of the Common Stock being registered. All
amounts are estimates except for the Securities and Exchange Commission
registration fee, the NASD filing fee and the Nasdaq National Market filing fee.
 
<TABLE>
    <S>                                                                         <C>
    Securities and Exchange Commission registration fee.......................  $ 17,399
    NASD filing fee...........................................................     5,546
    Nasdaq National Market listing fee........................................    10,000
    Accounting fees and expenses..............................................   100,000
    Legal fees and expenses...................................................   115,000
    Printing..................................................................    60,000
    Blue sky fees and expenses................................................    12,000
    Transfer agent and registrar fees and expenses............................     5,000
    Custodian fees and expenses...............................................     5,000
    Miscellaneous.............................................................    20,055
                                                                                ----------
              Total...........................................................  $350,000
                                                                                ==========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     The Registrant's Articles of Incorporation include a provision that
eliminates the personal liability of its directors to the Registrant and its
shareholders for monetary damages for breach of the directors' fiduciary duties
to the fullest extent permitted by law. This limitation has no effect on a
director's liability (i) for acts or omissions that involve intentional
misconduct or a knowing and culpable violation of law, (ii) for acts or
omissions that a director believes to be contrary to the best interests of the
Registrant or its shareholders or that involve the absence of good faith on the
part of the director, (iii) for any transaction from which a director derived an
improper personal benefit, (iv) for acts or omissions that show a reckless
disregard for the director's duty to the Registrant or its shareholders in
circumstances in which the director was aware, or should have been aware, in the
ordinary course of performing a director's duties, of a risk of a serious injury
to the Registrant or its shareholders, (v) for acts or omissions that constitute
an unexcused pattern of inattention that amounts to an abdication of the
director's duty to Registrant or its shareholders, (vi) under Section 310 of the
California Corporations Code (the "California Code") (concerning contracts or
transactions between the Registrant and a director) or (vii) under Section 316
of the California Code (concerning directors' liability for improper dividends,
loans and guarantees). The provision does not extend to acts or omissions of a
director in his capacity as an officer. Further, the provisions will not affect
the availability of injunctions and other equitable remedies available to the
Registrant's shareholders for any violation of a director's fiduciary duty to
the Registrant or its shareholders.
 
     The Registrant's Articles of Incorporation also include an authorization
for the Registrant to indemnify its agents (as defined in Section 317 of the
California Code), through bylaw provisions, by agreement or otherwise, to the
fullest extent permitted by law. Pursuant to this latter provision, the
Registrant's Bylaws provide for indemnification of the Registrant's directors
and officers. In addition, the Registrant, at its discretion, may provide
indemnification to persons whom the Registrant is not obligated to indemnify.
The Bylaws also allow the Registrant to enter into indemnity agreements with
individual directors, officers, employees and other agents. These indemnity
agreements have been entered into with all directors and executive officers and
provide the maximum indemnification permitted by law. These agreements, together
with the Registrant's Bylaws and Articles of Incorporation, may require the
Registrant, among other things, to indemnify such directors and executive
 
                                      II-1
<PAGE>   56
 
officers against certain liabilities that may arise by reason of their status or
service as directors (other than liabilities resulting from willful misconduct
of a culpable nature), to advance expenses to them as they are incurred,
provided that they undertake to repay the amount advanced if it is ultimately
determined by a court that they are not entitled to indemnification, and to
obtain directors' and officers' insurance if available on reasonable terms.
 
     Section 317 of the California Code and the Registrant's Bylaws make
provision for the indemnification of officers, directors and other corporate
agents in terms sufficiently broad to indemnify such persons, under certain
circumstances for liabilities (including reimbursement of expenses incurred)
arising under the Securities Act.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions or otherwise, the Registrant has
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable.
 
     Reference is made to the following documents filed herewith or incorporated
by reference herein from the exhibits with the same respective numbers in either
the Registrant's Registration Statement on Form S-1 originally filed on January
26, 1990 (No. 33-33219) (the "Form S-1"), the Registrant's Form 10-Q for the
quarter ended August 31, 1993 (the "Form 10-Q") or the Registrant's Form 10-K
for the fiscal year ended February 28, 1996 (the "Form 10-K") regarding relevant
indemnification provisions described above:
 
<TABLE>
<CAPTION>
                                                                                  EXHIBIT
                                      DOCUMENT                                    NUMBER
    ----------------------------------------------------------------------------  -------
    <S>                                                                           <C>
    Form of Underwriting Agreement..............................................    1.01
    Registrant's Articles of Incorporation (incorporated by reference from
      the Form 10-K)............................................................    3.01(i)
    Registrant's Bylaws (incorporated by reference from
      the Form 10-Q)............................................................    3.03
    Form of Indemnity Agreement (incorporated by reference from
      the Form S-1).............................................................   10.06
</TABLE>
 
ITEM 16. EXHIBITS.
 
     The following exhibits are filed herewith or incorporated by reference
herein:
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                                          EXHIBIT TITLE
- -------      -----------------------------------------------------------------------------------
<C>     <C>  <S>
  1.01   --  Form of Underwriting Agreement.
  2.01   --  Agreement and Plan of Reorganization by and among Registrant, Software Components
             Group, Inc. a California corporation ("SCG"), and Alfred Chao dated as of August 9,
             1991 (incorporated by reference to Exhibit Number 2.01 to Registrant's Form 8-K
             filed on September 3, 1991 (the "September 3, 1991 Form 8-K")).
  2.02   --  Agreement of Merger by and between Registrant and SCG dated as of August 20, 1991
             (incorporated by reference to Exhibit Number 2.02 to the September 3, 1991 Form
             8-K).
  2.03   --  Stock Exchange Agreement dated as of October 31, 1995 by and between the Registrant
             and TakeFive Software GmbH and the holders of share interests in TakeFive Software
             GmbH (incorporated herein by reference to Exhibit 2.01 to the Registrant's Current
             Report on Form 8-K, dated October 31, 1995).
  2.04   --  Agreement and Plan of Reorganization dated as of December 14, 1995, as amended
             January 26, 1996, by and among Registrant, ISI Purchasing Corporation and Doctor
             Design, Inc. and related documents (incorporated herein by reference to Exhibit
             2.01 to the Registrant's Current Report on Form 8-K, dated January 26, 1996 (the
             "January 26, 1996 Form 8-K")).
</TABLE>
 
                                      II-2
<PAGE>   57
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                                          EXHIBIT TITLE
- -------      -----------------------------------------------------------------------------------
<C>     <C>  <S>
  2.05   --  Agreement of Merger dated as of January 26, 1996 by and between ISI Purchasing
             Corporation and Doctor Design, Inc. (incorporated herein by reference to Exhibit
             2.02 to the January 26, 1996 Form 8-K).
  4.01   --  Registration Rights Agreement, dated as of April 3, 1987 (incorporated herein by
             reference to Exhibit 4.02 to the Form S-1).
  5.01   --  Opinion of Fenwick & West LLP regarding legality of the securities being issued.
 23.01   --  Consent of Fenwick & West LLP (included in Exhibit 5.01).
 23.02   --  Consent of Coopers & Lybrand L.L.P., Independent Accountants.
 24.01   --  Power of Attorney (see Page II-4 of this Registration Statement).
 27.01   --  Financial Data Schedule (incorporated herein by reference to Exhibit 27.01 to the
             Form 10-K).
</TABLE>
 
ITEM 17. UNDERTAKINGS.
 
     The Registrant hereby undertakes the following:
 
          (1) For purposes of determining any liability under the Securities Act
     of 1933, the information omitted from the form of prospectus filed as part
     of this registration statement in reliance upon Rule 430A and contained in
     a form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act of 1933, each post-effective amendment that contains a form of
     prospectus shall be deemed to be a new registration statement relating to
     the securities offered therein, and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
Registration pursuant to the provisions described under Item 14 above, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling person in the successful defense of any action, suit or proceeding)
is asserted by such director, officer or controlling person in connection with
the securities being registered, the Registrant will, unless in the opinion of
counsel the matter has been settled by controlling precedent, submit to a court
of appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Act and will be governed by the final
adjudication of such issue.
 
                                      II-3
<PAGE>   58
 
                                   SIGNATURES
 
     In accordance with the requirements of the Securities Act, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and authorized this Registration Statement
to be signed on its behalf by the undersigned, thereunto duly authorized, in the
City of Santa Clara, State of California, on April 11, 1996.
 
                                          INTEGRATED SYSTEMS, INC.
 
                                          By: /s/       STEVEN SIPOWICZ
 
                                            ------------------------------------
                                                      Steven Sipowicz
                                                Vice President, Finance and
                                                  Chief Financial Officer
 
                               POWER OF ATTORNEY
 
     KNOW ALL PERSONS BY THESE PRESENTS that each person whose signature appears
below constitutes and appoints David P. St. Charles and Steven Sipowicz, and
each of them, his or her true and lawful attorneys-in-fact, with full power of
substitution, for him or her and in his or her name, place and stead in any and
all capacities, to sign any and all amendments (including post-effective
amendments) to this Registration Statement, and sign any registration statement
for the same offering covered by the Registration Statement that is to be
effective upon filing pursuant to Rule 462(b) promulgated under the Securities
Act, and all post-effective amendments thereto, and to file the same, with all
exhibits thereto and all documents in connection therewith, with the Securities
and Exchange Commission, granting unto said attorneys-in-fact and agents, and
each of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully to
all intents and purposes as he or she might or could do in person, hereby
ratifying and confirming all that said attorneys-in-fact and agents or any of
them, or his or her substitute or substitutes, may lawfully do or cause to be
done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed below by the following persons in the capacities and
on the dates indicated.
 
<TABLE>
<CAPTION>
                    NAME                                     TITLE                    DATE
- ---------------------------------------------    ------------------------------  ---------------
<C>                                              <S>                             <C>
        PRINCIPAL EXECUTIVE OFFICER:
      /s/         DAVID P. ST. CHARLES           President, Chief Executive      April 11, 1996
- ---------------------------------------------    Officer and Director
            David P. St. Charles
 PRINCIPAL FINANCIAL AND ACCOUNTING OFFICER:
        /s/           STEVEN SIPOWICZ            Vice President, Finance and     April 11, 1996
- ---------------------------------------------    Chief Financial Officer
               Steven Sipowicz
            ADDITIONAL DIRECTORS:
        /s/         NARENDRA K. GUPTA            Chairman of the Board and       April 11, 1996
- ---------------------------------------------    Secretary
              Narendra K. Gupta
        /s/            JOHN C. BOLGER            Director                        April 11, 1996
- ---------------------------------------------
               John C. Bolger
           /s/              VINITA               Director                        April 11, 1996
                     GUPTA
- ---------------------------------------------
                Vinita Gupta
        /s/           THOMAS KAILATH             Director                        April 11, 1996
- ---------------------------------------------
               Thomas Kailath
        /s/         RICHARD C. MURPHY            Director                        April 11, 1996
- ---------------------------------------------
              Richard C. Murphy
</TABLE>
 
                                      II-4
<PAGE>   59
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
                                                                                         SEQUENTIALLY
EXHIBIT                                                                                    NUMBERED
NUMBER                                          EXHIBITS                                     PAGE
- -------         -------------------------------------------------------------------------
<C>     <C>     <S>                                                                      <C>
  1.01   --     Form of Underwriting Agreement...........................................
  2.01   --     Agreement and Plan of Reorganization by and among Registrant, Software
                Components Group, Inc. a California corporation ("SCG"), and Alfred Chao
                dated as of August 9, 1991 (incorporated by reference to Exhibit Number
                2.01 to Registrant's Form 8-K filed on September 3, 1991 (the "September
                3, 1991 Form 8-K"))......................................................
  2.02   --     Agreement of Merger by and between Registrant and SCG dated as of August
                20, 1991 (incorporated by reference to Exhibit Number 2.02 to the
                September 3, 1991 Form 8-K)..............................................
  2.03   --     Stock Exchange Agreement dated as of October 31, 1995 by and between the
                Registrant and TakeFive Software GmbH and the holders of share interests
                in TakeFive Software GmbH (incorporated herein by reference to Exhibit
                2.01 to the Registrant's Current Report on Form 8-K, dated October 31,
                1995)....................................................................
  2.04   --     Agreement and Plan of Reorganization dated as of December 14, 1995, as
                amended January 26, 1996, by and among Registrant, ISI Purchasing
                Corporation and Doctor Design, Inc. and related documents (incorporated
                herein by reference to Exhibit 2.01 to the Registrant's Current Report on
                Form 8-K, dated January 26, 1996 (the "January 26, 1996 Form 8-K"))......
  2.05   --     Agreement of Merger dated as of January 26, 1996 by and between ISI
                Purchasing Corporation and Doctor Design, Inc. (incorporated herein by
                reference to Exhibit 2.02 to the January 26, 1996 Form 8-K)..............
  4.01   --     Registration Rights Agreement, dated as of April 3, 1987 (incorporated
                herein by reference to Exhibit 4.02 to the Form S-1).....................
  5.01   --     Opinion of Fenwick & West LLP regarding legality of the securities being
                issued...................................................................
 23.01   --     Consent of Fenwick & West LLP (included in Exhibit 5.01).................
 23.02   --     Consent of Coopers & Lybrand L.L.P., Independent Accountants.............
 24.01   --     Power of Attorney (see Page II-4 of this Registration Statement).........
 27.01   --     Financial Data Schedule (incorporated herein by reference to Exhibit
                27.01 to the Form 10-K)..................................................
</TABLE>

<PAGE>   1
                                                                    EXHIBIT 1.01

                               1,800,000 SHARES(1)

                                  COMMON STOCK


                             UNDERWRITING AGREEMENT

                                                                 May _____, 1996

HAMBRECHT & QUIST LLC
WESSELS, ARNOLD & HENDERSON, L.L.C.
  c/o Hambrecht & Quist LLC
  One Bush Street
  San Francisco, California 94104

Ladies and Gentlemen:

         Integrated Systems, Inc., a California corporation (herein called the
Company), proposes to issue and sell 500,000 shares of its authorized but
unissued Common Stock, no par value (herein called the Common Stock), and the
shareholders of the Company named in Schedule II hereto (herein collectively
called the Selling Securityholders) propose to sell an aggregate of 1,300,000
shares of Common Stock of the Company (said 1,800,000 shares of Common Stock
being herein called the Underwritten Stock). In addition to the Underwritten
Stock, Narendra K. Gupta proposes to grant to the Underwriters (as hereinafter
defined) an option to purchase up to 270,000 additional shares of Common Stock
(herein called the Option Stock and with the Underwritten Stock herein
collectively called the Stock). The Common Stock is more fully described in the
Registration Statement and the Prospectus hereinafter mentioned.

         The Company and the Selling Securityholders severally hereby confirm
the agreements made with respect to the purchase of the Stock by the several
underwriters, for whom you are acting, named in Schedule I hereto (herein
collectively called the Underwriters, which term shall also include any
underwriter purchasing Stock pursuant to Section 3(b) hereof). You represent and
warrant that you have been authorized by each of the other Underwriters to enter
into this Agreement on its behalf and to act for it in the manner herein
provided.

         1. REGISTRATION STATEMENT. The Company has filed with the Securities
and Exchange Commission (herein called the Commission) a registration statement
on Form S-3 (No. 333-_____), including the related preliminary prospectus, for
the registration under the Securities Act of 1933, as amended (herein called the
Securities Act) of the Stock. Copies of such registration statement and of each
amendment thereto, if any, including the related preliminary prospectus (meeting
the requirements of Rule 430A of the rules and regulations of the Commission)
heretofore filed by the Company with the Commission have been delivered to you.

         The term Registration Statement as used in this agreement shall mean
such registration statement, including all documents incorporated by reference
therein, all exhibits and financial statements, all information omitted
therefrom in reliance upon Rule 430A and contained in the Prospectus referred to
below, in the form in which it became effective, and any registration statement
filed pursuant to Rule 462(b) of the rules and regulations of the Commission
with respect to the Stock (herein called a Rule 462(b) registration statement),
and, in the event of any amendment thereto after the effective date of such
registration statement (herein called the Effective Date), shall also mean (from
and after the effectiveness of such amendment) such registration statement as so
amended (including any Rule 462(b) registration statement). The term Prospectus
as used in this Agreement shall mean the

- --------
(1) Plus an option to purchase from Narendra K. Gupta up to 270,000 additional
    shares to cover over-allotments.

                                       1
<PAGE>   2
prospectus, including all documents incorporated by reference therein, relating
to the Stock first filed with the Commission pursuant to Rule 424(b) and Rule
430A (or if no such filing is required, as included in the Registration
Statement) and, in the event of any supplement or amendment to such prospectus
after the Effective Date, shall also mean (from and after the filing with the
Commission of such supplement or the effectiveness of such amendment) such
prospectus as so supplemented or amended. The term Preliminary Prospectus as
used in this Agreement shall mean each preliminary prospectus, including all
documents incorporated by reference therein, included in such registration
statement prior to the time it becomes effective.

         The Registration Statement has been declared effective under the
Securities Act, and no post-effective amendment to the Registration Statement
has been filed as of the date of this Agreement. The Company has caused to be
delivered to you copies of each Preliminary Prospectus and has consented to the
use of such copies for the purposes permitted by the Securities Act.

         2. REPRESENTATIONS AND WARRANTIES OF THE COMPANY AND THE SELLING
SECURITYHOLDERS.

         (a) Each of the Company and Narendra K. Gupta (to the best of his
knowledge after reasonable inquiry as to the representations and warranties set
forth in Section 2(a)(vii) below) hereby represents and warrants as follows:

                  (i) Each of the Company and its subsidiaries has been duly
         incorporated and is validly existing as a corporation in good standing
         under the laws of the jurisdiction of its incorporation, has full
         corporate power and authority to own or lease its properties and
         conduct its business as described in the Registration Statement and the
         Prospectus and as being conducted, and is duly qualified as a foreign
         corporation and in good standing in all jurisdictions in which the
         character of the property owned or leased or the nature of the business
         transacted by it makes qualification necessary (except where the
         failure to be so qualified would not have a material adverse effect on
         the business, properties, financial condition or results of operations
         of the Company and its subsidiaries, taken as a whole).

                  (ii) Since the respective dates as of which information is
         given in the Registration Statement and the Prospectus, there has not
         been any materially adverse change in the business, properties,
         financial condition or results of operations of the Company and its
         subsidiaries, taken as a whole, whether or not arising from
         transactions in the ordinary course of business, other than as set
         forth in the Registration Statement and the Prospectus, and since such
         dates, except in the ordinary course of business, neither the Company
         nor any of its subsidiaries has entered into any material transaction
         not referred to in the Registration Statement and the Prospectus.

                  (iii) The Registration Statement and the Prospectus comply,
         and on the Closing Date (as hereinafter defined) and any later date on
         which Option Stock is to be purchased, the Prospectus will comply, in
         all material respects, with the provisions of the Securities Act and
         the Securities Exchange Act of 1934, as amended (herein called the
         Exchange Act) and the rules and regulations of the Commission
         thereunder; on the Effective Date, the Registration Statement did not
         contain any untrue statement of a material fact and did not omit to
         state any material fact required to be stated therein or necessary in
         order to make the statements therein not misleading; and, on the
         Effective Date the Prospectus did not and, on the Closing Date and any
         later date on which Option Stock is to be purchased, will not contain
         any untrue statement of a material fact or omit to state any material
         fact necessary in order to make the statements therein, in the light of
         the circumstances under which they were made, not misleading; provided,
         however, that none of the representations and warranties in this
         subparagraph (iii) shall apply to statements in, or omissions from, the
         Registration Statement or the Prospectus made in reliance upon and in
         conformity with information herein or otherwise furnished in writing to
         the Company by or on behalf of the Underwriters for use in the
         Registration Statement or the Prospectus.

                  (iv) The Stock is duly and validly authorized, is (or, in the
         case of shares of the Stock to be sold by the Company, will be, when
         issued and sold to the Underwriters as provided herein) duly and
         validly

                                       2
<PAGE>   3
         issued, fully paid and nonassessable and conforms in all material
         respects to the description thereof in the Prospectus. No further
         approval or authority of the shareholders or the Board of Directors of
         the Company will be required for the transfer and sale of the Stock to
         be sold by the Selling Securityholders or the issuance and sale of the
         Stock as contemplated herein.

                  (v) The Stock to be sold by the Selling Securityholders is
         listed and duly admitted to trading on the Nasdaq National Market, and
         prior to the Closing Date the Stock to be issued and sold by the
         Company will be authorized for listing by the Nasdaq National Market
         upon official notice of issuance.

                  (vi) The conditions for use of Form S-3, as set forth in the
         General Instructions thereto, have been satisfied.

                  (vii) The Company owns or possess adequate licenses or other
         rights to use all patents, copyrights, trademarks, service marks, trade
         names, technology and know-how necessary to conduct its business in the
         manner described in the Prospectus and, except as disclosed in the
         Prospectus, the Company has not received any notice of infringement or
         conflict with (and knows of no infringement or conflict with) asserted
         rights of others with respect to any patents, copyrights, trademarks,
         service marks, trade names, technology and know-how which could result
         in any material adverse effect upon the Company and its subsidiaries,
         taken as a whole; and, to the Company's and Mr. Gupta's knowledge,
         except as disclosed in the Prospectus, the discoveries, inventions,
         products or processes of the Company referred to in the Prospectus do
         not infringe or conflict with any right or patent of any third party,
         or any discovery, invention, product or process which is the subject of
         a patent application filed by any third party, known to the Company
         which could have a material adverse effect on the Company and its
         subsidiaries, taken as a whole.

                  (viii) The Company is not an "investment company" or a company
         "controlled" by an "investment company" within the meaning of the
         Investment Company Act of 1940, as amended.

                  (ix) Other than as set forth in the Registration Statement, no
         holder of any security of the Company has any right to require
         registration of shares of Common Stock or any other security of the
         Company.

         (b) Each of the Selling Securityholders hereby represents and warrants
as follows, except Narendra K. Gupta represents and warrants only as set forth
in subsections (i) and (ii) hereof:

                  (i) Such Selling Securityholder has good and marketable title
         to all the shares of Stock to be sold by such Selling Securityholder
         hereunder, free and clear of all liens, encumbrances, equities,
         security interests and claims whatsoever, with full right and authority
         to deliver the same hereunder, subject, in the case of each Selling
         Securityholder, to the rights of Chemical Mellon Shareholder Services,
         as Custodian (herein called the Custodian), and that upon the delivery
         of and payment for such shares of the Stock hereunder, the several
         Underwriters will receive good and marketable title thereto, free and
         clear of all liens, encumbrances, equities, security interests and
         claims whatsoever.

                  (ii) Certificates in negotiable form for the shares of the
         Stock to be sold by such Selling Securityholder have been placed in
         custody under a Custody Agreement for delivery under this Agreement
         with the Custodian; such Selling Securityholder specifically agrees
         that the shares of the Stock represented by the certificates so held in
         custody for such Selling Securityholder are subject to the interests of
         the several Underwriters and the Company, that the arrangements made by
         such Selling Securityholder for such custody, including the Power of
         Attorney provided for in such Custody Agreement, are to that extent
         irrevocable, and that the obligations of such Selling Securityholder
         shall not be terminated by any act of such Selling Securityholder or by
         operation of law, whether by the death or incapacity of such Selling
         Securityholder or the occurrence of any other event; if any such death,
         incapacity, or other such event should occur before the delivery of
         such shares of the Stock hereunder, certificates for such shares of the
         Stock shall be delivered by the Custodian in accordance with the terms
         and conditions of this Agreement

                                       3
<PAGE>   4
         as if such death, incapacity, or other event had not occurred,
         regardless of whether the Custodian shall have received notice of such
         death, incapacity, or other event.

                  (iii) Such Selling Securityholder has reviewed the
         Registration Statement and Prospectus and, although such Selling
         Securityholder has not independently verified the accuracy or
         completeness of all the information contained therein, nothing has come
         to the attention of such Selling Securityholder that would lead such
         Selling Securityholder to believe that on the Effective Date, the
         Registration Statement contained any untrue statement of a material
         fact or omitted to state any material fact required to be stated
         therein or necessary in order to make the statements therein not
         misleading; and, on the Effective Date the Prospectus contained and, on
         the Closing Date and any later date on which Option Stock is to be
         purchased, contains any untrue statement of a material fact or omitted
         or omits to state any material fact necessary in order to make the
         statements therein, in the light of the circumstances under which they
         were made, not misleading.

         3. PURCHASE OF THE STOCK BY THE UNDERWRITERS.

         (a) On the basis of the representations and warranties and subject to
the terms and conditions herein set forth, the Company agrees to issue and sell
500,000 shares of the Underwritten Stock to the several Underwriters, each
Selling Securityholder agrees to sell to the several Underwriters the number of
shares of the Underwritten Stock set forth in Schedule II opposite the name of
such Selling Securityholder, and each of the Underwriters agrees to purchase
from the Company and the Selling Securityholders the respective aggregate number
of shares of Underwritten Stock set forth opposite its name in Schedule I. The
price at which such shares of Underwritten Stock shall be sold by the Company
and the Selling Securityholders and purchased by the several Underwriters shall
be $___ per share. The obligation of each Underwriter to the Company and each of
the Selling Securityholders shall be to purchase from the Company and the
Selling Securityholders that number of shares of the Underwritten Stock which
represents the same proportion of the total number of shares of the Underwritten
Stock to be sold by each of the Company and the Selling Securityholders pursuant
to this Agreement as the number of shares of the Underwritten Stock set forth
opposite the name of such Underwriter in Schedule I hereto represents of the
total number of shares of the Underwritten Stock to be purchased by all
Underwriters pursuant to this Agreement, as adjusted by you in such manner as
you deem advisable to avoid fractional shares. In making this Agreement, each
Underwriter is contracting severally and not jointly; except as provided in
paragraphs (b) and (c) of this Section 3, the agreement of each Underwriter is
to purchase only the respective number of shares of the Underwritten Stock
specified in Schedule I.

         (b) If for any reason one or more of the Underwriters shall fail or
refuse (otherwise than for a reason sufficient to justify the termination of
this Agreement under the provisions of Section 8 or 9 hereof) to purchase and
pay for the number of shares of the Stock agreed to be purchased by such
Underwriter or Underwriters, the Company or the Selling Securityholders shall
immediately give notice thereof to you, and the non-defaulting Underwriters
shall have the right within 24 hours after the receipt by you of such notice to
purchase, or procure one or more other Underwriters to purchase, in such
proportions as may be agreed upon between you and such purchasing Underwriter or
Underwriters and upon the terms herein set forth, all or any part of the shares
of the Stock which such defaulting Underwriter or Underwriters agreed to
purchase. If the non-defaulting Underwriters fail so to make such arrangements
with respect to all such shares, the number of shares of the Stock which each
non-defaulting Underwriter is otherwise obligated to purchase under this
Agreement shall be automatically increased on a pro rata basis to absorb the
remaining shares which the defaulting Underwriter or Underwriters agreed to
purchase; provided, however, that the non-defaulting Underwriters shall not be
obligated to purchase the shares which the defaulting Underwriter or
Underwriters agreed to purchase if the aggregate number of such shares of the
Stock exceeds 10% of the total number of shares of the Stock which all
Underwriters agreed to purchase hereunder. If the total number of shares of the
Stock which the defaulting Underwriter or Underwriters agreed to purchase shall
not be purchased or absorbed in accordance with the two preceding sentences, the
Company and the Selling Securityholders shall have the right, within 24 hours
next succeeding the 24-hour period above referred to, to make arrangements with
other underwriters or purchasers satisfactory to you for purchase of such shares
on the terms herein set forth. In any such case, either you or the Company and
the Selling

                                       4
<PAGE>   5
Securityholders shall have the right to postpone the Closing Date determined as
provided in Section 5 hereof for not more than seven business days after the
date originally fixed as the Closing Date pursuant to said Section 5 in order
that any necessary changes in the Registration Statement, the Prospectus or any
other documents or arrangements may be made. If neither the non-defaulting
Underwriters nor the Company and the Selling Securityholders shall make
arrangements within the 24-hour periods stated above for the purchase of all the
shares of the Stock which the defaulting Underwriter or Underwriters agreed to
purchase hereunder, this Agreement shall be terminated without further act or
deed and without any liability on the part of the Company or the Selling
Securityholders to any non-defaulting Underwriter and without any liability on
the part of any non-defaulting Underwriter to the Company or the Selling
Securityholders. Nothing in this paragraph (b), and no action taken hereunder,
shall relieve any defaulting Underwriter from liability in respect of any
default of such Underwriter under this Agreement.

         (c) On the basis of the representations, warranties and covenants
herein contained, and subject to the terms and conditions herein set forth,
Narendra K. Gupta grants an option to the several Underwriters to purchase,
severally and not jointly, up to 270,000 shares in the aggregate of the Option
Stock from Narendra K. Gupta at the same price per share as the Underwriters
shall pay for the Underwritten Stock. Said option may be exercised only to cover
over-allotments in the sale of the Underwritten Stock by the Underwriters and
may be exercised in whole or in part at any time (but not more than once) on or
before the thirtieth day after the date of this Agreement upon written or
telegraphic notice by you to the Company setting forth the aggregate number of
shares of the Option Stock as to which the several Underwriters are exercising
the option. Delivery of certificates for the shares of Option Stock, and payment
therefor, shall be made as provided in Section 5 hereof. The number of shares of
the Option Stock to be purchased by each Underwriter shall be the same
percentage of the total number of shares of the Option Stock to be purchased by
the several Underwriters as such Underwriter is purchasing of the Underwritten
Stock, as adjusted by you in such manner as you deem advisable to avoid
fractional shares.

         4. OFFERING BY UNDERWRITERS.

         (a) The terms of the public offering by the Underwriters of the Stock
to be purchased by them shall be as set forth in the Prospectus. The
Underwriters may from time to time change the public offering price after the
closing of the public offering and increase or decrease the concessions and
discounts to dealers as they may determine.

         (b) The information set forth in the last paragraph on the front cover
page and under "Underwriting" in the Registration Statement, any Preliminary
Prospectus and the Prospectus relating to the Stock filed by the Company
(insofar as such information relates to the Underwriters) constitutes the only
information furnished by the Underwriters to the Company for inclusion in the
Registration Statement, any Preliminary Prospectus, and the Prospectus, and you
on behalf of the respective Underwriters represent and warrant to the Company
that the statements made therein are correct.

         5. DELIVERY OF AND PAYMENT FOR THE STOCK.

         (a) Delivery of certificates for the shares of the Underwritten Stock
and the Option Stock (if the option granted by Section 3(c) hereof shall have
been exercised not later than 7:00 A.M., San Francisco time, on the date two
business days preceding the Closing Date), and payment therefor, shall be made
at the office of Fenwick & West LLP, Two Palo Alto Square, Palo Alto,
California, at 7:00 a.m., San Francisco time, on the [fourth] business day after
the date of this Agreement, or at such time on such other day, not later than
seven full business days after such [fourth] business day, as shall be agreed
upon in writing by the Company, the Selling Securityholders and you. The date
and hour of such delivery and payment (which may be postponed as provided in
Section 3(b) hereof) are herein called the Closing Date.

         (b) If the option granted by Section 3(c) hereof shall be exercised
after 7:00 a.m., San Francisco time, on the date two business days preceding the
Closing Date, delivery of certificates for the shares of Option

                                       5
<PAGE>   6
Stock, and payment therefor, shall be made at the office of Fenwick & West LLP,
Two Palo Alto Square, Palo Alto, California, at 7:00 a.m., San Francisco time,
on the third business day after the exercise of such option.

         (c) Payment for the Stock purchased from the Company shall be made to
the Company or its order, and payment for the Stock purchased from the Selling
Securityholders shall be made to the Custodian, for the account of the Selling
Securityholders, in each case by wire transfer in federal Funds. Such payment
shall be made upon delivery of certificates for the Stock to you for the
respective accounts of the several Underwriters against receipt therefor signed
by you. Certificates for the Stock to be delivered to you shall be registered
in such name or names and shall be in such denominations as you may request at
least one business day before the Closing Date, in the case of Underwritten
Stock, and at least one business day prior to the purchase thereof, in the case
of the Option Stock. Such certificates will be made available to the
Underwriters for inspection, checking and packaging at the offices of Lewco
Securities Corporation, 2 Broadway, New York, New York 10004 on the business
day prior to the Closing Date or, in the case of the Option Stock, by 3:00
p.m., New York time, on the business day preceding the date of purchase.

         It is understood that you, individually and not on behalf of the
Underwriters, may (but shall not be obligated to) make payment to the Company
and the Selling Securityholders for shares to be purchased by any Underwriter
whose check shall not have been received by you on the Closing Date or any later
date on which Option Stock is purchased for the account of such Underwriter. Any
such payment by you shall not relieve such Underwriter from any of its
obligations hereunder.

         6. FURTHER AGREEMENTS OF THE COMPANY AND THE SELLING SECURITYHOLDERS.
Each of the Company and the Selling Securityholders respectively covenants and
agrees as follows:

                  (a) The Company will (i) prepare and timely file with the
         Commission under Rule 424(b) a Prospectus containing information
         previously omitted at the time of effectiveness of the Registration
         Statement in reliance on Rule 430A and (ii) not file any amendment to
         the Registration Statement or supplement to the Prospectus of which you
         shall not previously have been advised and furnished with a copy or to
         which you shall have reasonably objected in writing or which is not in
         compliance with the Securities Act or the rules and regulations of the
         Commission.

                  (b) The Company will promptly notify each Underwriter in the
         event of (i) the request by the Commission for amendment of the
         Registration Statement or for supplement to the Prospectus or for any
         additional information, (ii) the issuance by the Commission of any stop
         order suspending the effectiveness of the Registration Statement, (iii)
         the institution or notice of intended institution of any action or
         proceeding for that purpose, (iv) the receipt by the Company of any
         notification with respect to the suspension of the qualification of the
         Stock for sale in any jurisdiction, or (v) the receipt by it of notice
         of the initiation or threatening of any proceeding for such purpose.
         The Company and the Selling Securityholders will make every reasonable
         effort to prevent the issuance of such a stop order and, if such an
         order shall at any time be issued, to obtain the withdrawal thereof at
         the earliest possible moment.

                  (c) The Company will (i) on or before the Closing Date,
         deliver to you a signed copy of the Registration Statement as
         originally filed and of each amendment thereto filed prior to the time
         the Registration Statement becomes effective and, promptly upon the
         filing thereof, a signed copy of each post-effective amendment, if any,
         to the Registration Statement (together with, in each case, all
         exhibits thereto unless previously furnished to you) and will also
         deliver to you, for distribution to the Underwriters, a sufficient
         number of additional conformed copies of each of the foregoing (but
         without exhibits) so that one copy of each may be distributed to each
         Underwriter, (ii) as promptly as possible deliver to you and send to
         the several Underwriters, at such office or offices as you may
         designate, as many copies of the Prospectus as you may reasonably
         request, and (iii) thereafter from time to time during the period in
         which a prospectus is required by law to be delivered by an Underwriter
         or dealer, likewise send to the Underwriters as many additional copies
         of the Prospectus and as many copies of any

                                       6
<PAGE>   7
         supplement to the Prospectus and of any amended prospectus, filed by
         the Company with the Commission, as you may reasonably request for the
         purposes contemplated by the Securities Act.

                  (d) If at any time during the period in which a prospectus is
         required by law to be delivered by an Underwriter or dealer any event
         relating to or affecting the Company, or of which the Company shall be
         advised in writing by you, shall occur as a result of which it is
         necessary, in the opinion of counsel for the Company or of counsel for
         the Underwriters, to supplement or amend the Prospectus in order to
         make the Prospectus not misleading in the light of the circumstances
         existing at the time it is delivered to a purchaser of the Stock, the
         Company will forthwith prepare and file with the Commission a
         supplement to the Prospectus or an amended prospectus so that the
         Prospectus as so supplemented or amended will not contain any untrue
         statement of a material fact or omit to state any material fact
         necessary in order to make the statements therein, in the light of the
         circumstances existing at the time such Prospectus is delivered to such
         purchaser, not misleading. If, after the public offering of the Stock
         by the Underwriters and during such period, the Underwriters shall
         propose to vary the terms of offering thereof by reason of changes in
         general market conditions or otherwise, you will advise the Company in
         writing of the proposed variation, and, if in the opinion either of
         counsel for the Company or of counsel for the Underwriters such
         proposed variation requires that the Prospectus be supplemented or
         amended, the Company will forthwith prepare and file with the
         Commission a supplement to the Prospectus or an amended prospectus
         setting forth such variation. The Company authorizes the Underwriters
         and all dealers to whom any of the Stock may be sold by the several
         Underwriters to use the Prospectus, as from time to time amended or
         supplemented, in connection with the sale of the Stock in accordance
         with the applicable provisions of the Securities Act and the applicable
         rules and regulations thereunder for such period.

                  (e) Prior to the filing thereof with the Commission, the
         Company will submit to you, for your information, a copy of any
         post-effective amendment to the Registration Statement and any
         supplement to the Prospectus or any amended prospectus proposed to be
         filed.

                  (f) The Company will cooperate, when and as requested by you,
         in the qualification of the Stock for offer and sale under the
         securities or blue sky laws of such jurisdictions as you may designate
         and, during the period in which a prospectus is required by law to be
         delivered by an Underwriter or dealer, in keeping such qualifications
         in good standing under said securities or blue sky laws; provided,
         however, that the Company shall not be obligated to file any general
         consent to service of process or to qualify as a foreign corporation in
         any jurisdiction in which it is not so qualified. The Company will,
         from time to time, prepare and file such statements, reports, and other
         documents as are or may be required to continue such qualifications in
         effect for so long a period as you may reasonably request for
         distribution of the Stock.

                  (g) During a period of five years commencing with the date
         hereof, the Company will furnish to you, and to each Underwriter who
         may so request in writing, copies of all periodic and special reports
         furnished to shareholders of the Company and of all information,
         documents and reports filed with the Commission.

                  (h) Not later than the 45th day following the end of the
         fiscal quarter first occurring after the first anniversary of the
         Effective Date, the Company will make generally available to its
         security holders an earnings statement in accordance with Section 11(a)
         of the Securities Act and Rule 158 thereunder.

                  (i) The Company agrees to pay all costs and expenses incident
         to the performance of its and the Selling Securityholders' obligations
         under this Agreement, including all costs and expenses incident to (i)
         the preparation, printing and filing with the Commission and the
         National Association of Securities Dealers, Inc. ("NASD") of the
         Registration Statement, any Preliminary Prospectus and the Prospectus,
         (ii) the furnishing to the Underwriters of copies of any Preliminary
         Prospectus and of the several documents required by paragraph (c) of
         this Section 6 to be so furnished, (iii) the printing of this

                                       7
<PAGE>   8
         Agreement and related documents delivered to the Underwriters, (iv) the
         preparation, printing and filing of all supplements and amendments to
         the Prospectus referred to in paragraph (d) of this Section 6, (v) the
         furnishing to you and the Underwriters of the reports and information
         referred to in paragraph (g) of this Section 6 and (vi) the printing
         and issuance of stock certificates, including the transfer agent's
         fees. The Selling Securityholders will pay any transfer taxes incident
         to the transfer to the Underwriters of the shares the Stock being sold
         by the Selling Securityholders. The Company will pay any fees for
         listing any Stock on the Nasdaq National Market not already listed
         thereon.

                  (j) The Company agrees to reimburse you, for the account of
         the several Underwriters, for blue sky fees and related disbursements
         (including counsel fees and disbursements and cost of printing
         memoranda for the Underwriters) paid by or for the account of the
         Underwriters or their counsel in qualifying the Stock under state
         securities or blue sky laws and in the review of the offering by the
         NASD.

                  (k) The provisions of paragraphs (i) and (j) of this Section
         are intended to relieve the Underwriters from the payment of the
         expenses and costs which the Company and the Selling Securityholders
         hereby agree to pay and shall not affect any agreement which the
         Company and the Selling Securityholders may make, or may have made, for
         the sharing of any such expenses and costs.

                  (l) The Company and each of the Selling Securityholders hereby
         agrees that, without the prior written consent of Hambrecht & Quist LLC
         acting alone or each of Hambrecht & Quist LLC and Wessels, Arnold &
         Henderson, L.L.C. acting jointly, the Company or such Selling
         Securityholder, as the case may be, will not, for a period of 90 days
         following the Effective Date, directly or indirectly, (i) sell, offer,
         contract to sell, make any short sale, pledge, sell any option or
         contract to purchase, purchase any option or contract to sell, grant
         any option, right or warrant to purchase or otherwise transfer or
         dispose of any shares of Common Stock or any securities convertible
         into or exchangeable or exercisable for or any rights to purchase or
         acquire Common Stock or (ii) enter into any swap or other agreement
         that transfers, in whole or in part, any of the economic consequences
         or ownership of Common Stock, whether any such transaction described in
         clause (i) or (ii) above is to be settled by delivery of Common Stock
         or such other securities, in cash or otherwise. The foregoing sentence
         shall not apply to the Stock to be sold to the Underwriters pursuant to
         this Agreement or to any stock issued and sold pursuant to any employee
         benefit plan of the Company described in the Prospectus or in any
         merger or acquisition; provided, however, that the total number of
         shares of Common Stock or securities convertible, exchangeable or
         exercisable for Common Stock issued in such merger or acquisition shall
         not exceed 5% of the total number of shares of Common Stock then
         outstanding unless the persons to whom such shares or securities are
         issued agree to restrictions on the disposition of such shares or
         securities substantially similar in form and duration to those set
         forth in this paragraph.

                  (o) The Company is familiar with the Investment Company Act of
         1940, as amended, and has in the past conducted its affairs, and will
         in the future conduct its affairs, in such a manner to ensure that the
         Company was not and will not be an "investment company" or a company
         "controlled" by an "investment company" within the meaning of the
         Investment Company Act of 1940, as amended, and the rules and
         regulations thereunder.

         7. INDEMNIFICATION AND CONTRIBUTION.

         (a) Subject to the provisions of paragraph (f) of this Section 7, the
Company and the Selling Securityholders jointly and severally agree to indemnify
and hold harmless each Underwriter and each person (including each partner or
officer thereof) who controls any Underwriter within the meaning of Section 15
of the Securities Act from and against any and all losses, claims, damages or
liabilities, joint or several, to which such indemnified parties or any of them
may become subject under the Securities Act, the Securities Exchange Act of
1934, as amended (herein called the Exchange Act), or the common law or
otherwise, and the Company and the Selling Securityholders jointly and severally
agree to reimburse each such Underwriter and controlling person for any legal or
other expenses (including, except as otherwise hereinafter provided, reasonable
fees and disbursements

                                       8
<PAGE>   9
of counsel) incurred by the respective indemnified parties in connection with
defending against any such losses, claims, damages or liabilities or in
connection with any investigation or inquiry of, or other proceeding which may
be brought against, the respective indemnified parties, in each case arising out
of or based upon (i) any untrue statement or alleged untrue statement of a
material fact contained in the Registration Statement (including the Prospectus
as part thereof and any Rule 462(b) registration statement) or any
post-effective amendment thereto (including any Rule 462(b) registration
statement), or the omission or alleged omission to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, or (ii) any untrue statement or alleged untrue statement of a
material fact contained in any Preliminary Prospectus or the Prospectus (as
amended or as supplemented if the Company shall have filed with the Commission
any amendment thereof or supplement thereto) or the omission or alleged omission
to state therein a material fact necessary in order to make the statements
therein, in the light of the circumstances under which they were made, not
misleading; provided, however, that (1) the indemnity agreements of the Company
and the Selling Securityholders contained in this paragraph (a) shall not apply
to any such losses, claims, damages, liabilities or expenses if such statement
or omission was made in reliance upon and in conformity with information
furnished as herein stated or otherwise furnished in writing to the Company by
or on behalf of any Underwriter for use in any Preliminary Prospectus or the
Registration Statement or the Prospectus or any such amendment thereof or
supplement thereto, (2) the indemnity agreement contained in this paragraph (a)
with respect to any Preliminary Prospectus shall not inure to the benefit of any
Underwriter from whom the person asserting any such losses, claims, damages,
liabilities or expenses purchased the Stock which is the subject thereof (or to
the benefit of any person controlling such Underwriter) if at or prior to the
written confirmation of the sale of such Stock a copy of the Prospectus (or the
Prospectus as amended or supplemented) was not sent or delivered to such person
(excluding the documents incorporated therein by reference) and the untrue
statement or omission of a material fact contained in such Preliminary
Prospectus was corrected in the Prospectus (or the Prospectus as amended or
supplemented) unless the failure is the result of noncompliance by the Company
with paragraph (c) of Section 6 hereof. The indemnity agreements of the Company
and the Selling Securityholders contained in this paragraph (a) and the
representations and warranties of the Company and the Selling Securityholders
contained in Section 2 hereof shall remain operative and in full force and
effect regardless of any investigation made by or on behalf of any indemnified
party and shall survive the delivery of and payment for the Stock.

         (b) Each Underwriter severally agrees to indemnify and hold harmless
the Company, each of its officers who signs the Registration Statement on his
own behalf or pursuant to a power of attorney, each of its directors, each other
Underwriter and each person (including each partner or officer thereof) who
controls the Company or any such other Underwriter within the meaning of Section
15 of the Securities Act, and the Selling Securityholders from and against any
and all losses, claims, damages or liabilities, joint or several, to which such
indemnified parties or any of them may become subject under the Securities Act,
the Exchange Act, or the common law or otherwise and to reimburse each of them
for any legal or other expenses (including, except as otherwise hereinafter
provided, reasonable fees and disbursements of counsel) incurred by the
respective indemnified parties in connection with defending against any such
losses, claims, damages or liabilities or in connection with any investigation
or inquiry of, or other proceeding which may be brought against, the respective
indemnified parties, in each case arising out of or based upon (i) any untrue
statement or alleged untrue statement of a material fact contained in the
Registration Statement (including the Prospectus as part thereof and any Rule
462(b) registration statement) or any post-effective amendment thereto
(including any Rule 462(b) registration statement) or the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading or (ii) any untrue
statement or alleged untrue statement of a material fact contained in the
Prospectus (as amended or as supplemented if the Company shall have filed with
the Commission any amendment thereof or supplement thereto) or the omission or
alleged omission to state therein a material fact necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading, if such statement or omission was made in reliance upon
and in conformity with information furnished as herein stated or otherwise
furnished in writing to the Company by or on behalf of such indemnifying
Underwriter for use in any Preliminary Prospectus or the Registration Statement
or the Prospectus or any such amendment thereof or supplement thereto. The
indemnity agreement of each Underwriter contained in this paragraph (b) shall
remain operative and in full force and effect regardless of any investigation
made by or on behalf of any indemnified party and shall survive the delivery of
and payment for the Stock.

                                       9
<PAGE>   10
         (c) Each party indemnified under the provision of paragraphs (a) and
(b) of this Section 7 agrees that, upon the service of a summons or other
initial legal process upon it in any action or suit instituted against it or
upon its receipt of written notification of the commencement of any
investigation or inquiry of, or proceeding against, it in respect of which
indemnity may be sought on account of any indemnity agreement contained in such
paragraphs, it will promptly give written notice (herein called the Notice) of
such service or notification to the party or parties from whom indemnification
may be sought hereunder. No indemnification provided for in such paragraphs
shall be available to any party who shall fail so to give the Notice if the
party to whom such Notice was not given was unaware of the action, suit,
investigation, inquiry or proceeding to which the Notice would have related and
was prejudiced by the failure to give the Notice, but the omission so to notify
such indemnifying party or parties of any such service or notification shall not
relieve such indemnifying party or parties from any liability which it or they
may have to the indemnified party for contribution or otherwise than on account
of such indemnity agreement. Any indemnifying party shall be entitled at its own
expense to participate in the defense of any action, suit or proceeding against,
or investigation or inquiry of, an indemnified party. Any indemnifying party
shall be entitled, if it so elects within a reasonable time after receipt of the
Notice by giving written notice (herein called the Notice of Defense) to the
indemnified party, to assume (alone or in conjunction with any other
indemnifying party or parties) the entire defense of such action, suit,
investigation, inquiry or proceeding, in which event such defense shall be
conducted, at the expense of the indemnifying party or parties, by counsel
chosen by such indemnifying party or parties and reasonably satisfactory to the
indemnified party or parties; provided, however, that (i) if the indemnified
party or parties reasonably determine that there may be a conflict between the
positions of the indemnifying party or parties and of the indemnified party or
parties in conducting the defense of such action, suit, investigation, inquiry
or proceeding or that there may be legal defenses available to such indemnified
party or parties different from or in addition to those available to the
indemnifying party or parties, then counsel for the indemnified party or parties
shall be entitled to conduct the defense to the extent reasonably determined by
such counsel to be necessary to protect the interests of the indemnified party
or parties and (ii) in any event, the indemnified party or parties shall be
entitled to have counsel chosen by such indemnified party or parties participate
in, but not conduct, the defense. If, within a reasonable time after receipt of
the Notice, an indemnifying party gives a Notice of Defense and the counsel
chosen by the indemnifying party or parties is reasonably satisfactory to the
indemnified party or parties, the indemnifying party or parties will not be
liable under paragraphs (a) through (c) of this Section 7 for any legal or other
expenses subsequently incurred by the indemnified party or parties in connection
with the defense of the action, suit, investigation, inquiry or proceeding,
except that (A) the indemnifying party or parties shall bear the legal and other
expenses incurred in connection with the conduct of the defense as referred to
in clause (i) of the proviso to the preceding sentence and (B) the indemnifying
party or parties shall bear such other expenses as it or they have authorized to
be incurred by the indemnified party or parties. If, within a reasonable time
after receipt of the Notice, no Notice of Defense has been given, the
indemnifying party or parties shall be responsible for any legal or other
expenses incurred by the indemnified party or parties in connection with the
defense of the action, suit, investigation, inquiry or proceeding.

         (d) If the indemnification provided for in this Section 7 is
unavailable or insufficient to hold harmless an indemnified party under
paragraph (a) or (b) of this Section 7, then each indemnifying party, in lieu of
indemnifying such indemnified party, shall contribute to the amount paid or
payable by such indemnified party as a result of the losses, claims, damages or
liabilities referred to in paragraph (a) or (b) of this Section 7 (i) in such
proportion as is appropriate to reflect the relative benefits received by each
indemnifying party from the offering of the Stock or (ii) if the allocation
provided by clause (i) above is not permitted by applicable law, in such
proportion as is appropriate to reflect not only the relative benefits referred
to in clause (i) above but also the relative fault of each indemnifying party in
connection with the statements or omissions that resulted in such losses,
claims, damages or liabilities, or actions in respect thereof, as well as any
other relevant equitable considerations. The relative benefits received by the
Company and the Selling Securityholders on the one hand and the Underwriters on
the other shall be deemed to be in the same respective proportions as the total
net proceeds from the offering of the Stock received by the Company and the
Selling Securityholders and the total underwriting discount received by the
Underwriters, as set forth in the table on the cover page of the Prospectus,
bear to the aggregate public offering price of the Stock. Relative fault shall
be determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by each indemnifying party and
the parties' relative intent, knowledge, access to information and opportunity
to correct or prevent such untrue statement or omission.

                                       10
<PAGE>   11
         The parties agree that it would not be just and equitable if
contributions pursuant to this paragraph (d) were to be determined by pro rata
allocation (even if the Underwriters were treated as one entity for such
purpose) or by any other method of allocation which does not take into account
the equitable considerations referred to in the first sentence of this paragraph
(d). The amount paid by an indemnified party as a result of the losses, claims,
damages or liabilities, or actions in respect thereof, referred to in the first
sentence of this paragraph (d) shall be deemed to include any legal or other
expenses reasonably incurred by such indemnified party in connection with
investigation or preparing to defend or defending against any action or claim
which is the subject of this paragraph (d). Notwithstanding the provisions of
this paragraph (d), no Underwriter shall be required to contribute any amount in
excess of the underwriting discount applicable to the Stock purchased by such
Underwriter. No person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation. The Underwriters' obligations in this paragraph (d) to
contribute are several in proportion to their respective underwriting
obligations and not joint.

         Each party entitled to contribution agrees that upon the service of a
summons or other initial legal process upon it in any action instituted against
it in respect of which contribution may be sought, it will promptly give written
notice of such service to the party or parties from whom contribution may be
sought, but the omission so to notify such party or parties of any such service
shall not relieve the party from whom contribution may be sought from any
obligation it may have hereunder or otherwise (except as specifically provided
in paragraph (c) of this Section 7).

         (e) No indemnifying party will, without the prior written consent of
the indemnified party, settle or compromise or consent to the entry of any
judgment in any pending or threatened claim, action, suit or proceeding in
respect of which indemnification may be sought hereunder (whether or not such
indemnified party or any person who controls such indemnified party within the
meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act is
a party to such claim, action, suit or proceeding) unless such settlement,
compromise or consent includes an unconditional release of such indemnified
party and each such controlling person from all liability arising out of such
claim, action, suit or proceeding.

         (f) The liability of each Selling Securityholder, under such Selling
Securityholder's representations and warranties contained in Section 2 hereof
and under the indemnity, contribution and reimbursement agreements contained in
the provisions of this Section 7 and Section 11 hereof shall be limited to the
lesser of (i) an amount equal to the price of the Stock sold by such Selling
Securityholder to the Underwriters as set forth in paragraph (a) of Section 3
hereof or (ii) his pro rata portion of the liability hereunder calculated by
multiplying the total liability by a fraction, the numerator of which is the
number of shares of Stock sold by such Selling Securityholder and the
denominator of which is the total number of shares of Stock sold hereunder. The
Company and the Selling Securityholders may agree, as among themselves and
without limiting the rights of the Underwriters under this Agreement, as to the
respective amounts of such liability for which they each shall be responsible.

         8. TERMINATION. This Agreement may be terminated by you at any time
prior to the Closing Date by giving written notice to the Company and the
Selling Securityholders if after the date of this Agreement trading in the
Common Stock shall have been suspended, or if there shall have occurred (i) the
engagement in hostilities or an escalation of major hostilities by the United
States or the declaration of war or a national emergency by the United States on
or after the date hereof, (ii) any outbreak of hostilities or other national or
international calamity or crisis or change in economic or political conditions
if the effect of such outbreak, calamity, crisis or change in economic or
political conditions in the financial markets of the United States would, in the
Underwriters' reasonable judgment, make the offering or delivery of the Stock
impracticable, (iii) a suspension of trading in securities generally or a
material adverse decline in the value of securities generally on the New York
Stock Exchange, the American Stock Exchange, or The Nasdaq Stock Market, or
limitations on prices (other than limitations on hours or numbers of days of
trading) for securities on either such exchange or system, (iv) the enactment,
publication, decree or other promulgation of any federal or state statute,
regulation, rule or order of, or commencement of any proceeding or investigation
by, any court, legislative body, agency or other governmental

                                       11
<PAGE>   12
authority which in the Underwriters' reasonable opinion materially and adversely
affects or will materially or adversely affect the business or operations of the
Company, (v) declaration of a banking moratorium by either federal or New York
State authorities or (vi) the taking of any action by any federal, state or
local government or agency in respect of its monetary or fiscal affairs which
causes a material adverse decline in the value of securities on the New York
Stock Exchange, the American Stock Exchange, or The Nasdaq Stock Market. If this
Agreement shall be terminated pursuant to this Section 8, there shall be no
liability of the Company or the Selling Securityholders to the Underwriters and
no liability of the Underwriters to the Company or the Selling Securityholders;
provided, however, that in the event of any such termination the Company and the
Selling Securityholders agree to indemnify and hold harmless the Underwriters
from all costs or expenses incident to the performance of the obligations of the
Company and the Selling Securityholders under this Agreement, including all
costs and expenses referred to in paragraphs (i) and (j) of Section 6 hereof.

         9. CONDITIONS OF UNDERWRITERS' OBLIGATIONS. The obligations of the
several Underwriters to purchase and pay for the Stock shall be subject to the
performance by the Company and by the Selling Securityholders of all their
respective obligations to be performed hereunder at or prior to the Closing Date
or any later date on which Option Stock is to be purchased, as the case may be,
and to the following further conditions:

                  (a) The Registration Statement shall have become effective;
         and no stop order suspending the effectiveness thereof shall have been
         issued and no proceedings therefor shall be pending or threatened by
         the Commission.

                  (b) The legality and sufficiency of the sale of the Stock
         hereunder and the validity and form of the certificates representing
         the Stock, all corporate proceedings and other legal matters incident
         to the foregoing, and the form of the Registration Statement and of the
         Prospectus (except as to the financial statements, supporting schedules
         footnotes and other financial and statistical information contained
         therein), shall have been approved at or prior to the Closing Date by
         Morrison & Foerster LLP, counsel for the Underwriters.

                  (c) You shall have received from Fenwick & West LLP, counsel
         for the Company and the Selling Securityholders, an opinion, addressed
         to the Underwriters and dated the Closing Date, covering the matters
         set forth in Annex A hereto, respectively, and if Option Stock is
         purchased at any date after the Closing Date, additional opinions from
         each such counsel, addressed to the Underwriters and dated such later
         date, confirming that the statements expressed as of the Closing Date
         in such opinions remain valid as of such later date.

                  (d) You shall be satisfied that (i) as of the Effective Date,
         the statements made in the Registration Statement and the Prospectus
         were true and correct and neither the Registration Statement nor the
         Prospectus omitted to state any material fact required to be stated
         therein or necessary in order to make the statements therein,
         respectively, not misleading, (ii) since the Effective Date, no event
         has occurred which should have been set forth in a supplement or
         amendment to the Prospectus which has not been set forth in such a
         supplement or amendment, (iii) since the respective dates as of which
         information is given in the Registration Statement in the form in which
         it originally became effective and the Prospectus contained therein,
         there has not been any material adverse change or any development
         involving a prospective material adverse change in or affecting the
         business, properties, financial condition or results of operations of
         the Company and its subsidiaries, taken as a whole, whether or not
         arising from transactions in the ordinary course of business, and,
         since such dates, except in the ordinary course of business, neither
         the Company nor any of its subsidiaries has entered into any material
         transaction not referred to in the Registration Statement in the form
         in which it originally became effective and the Prospectus contained
         therein, (iv) neither the Company nor any of its subsidiaries has any
         material contingent obligations which are not disclosed in the
         Registration Statement and the Prospectus, (v) there are not any
         pending or known threatened legal proceedings to which the Company or
         any of its subsidiaries is a party or of which property of the Company
         or any of its subsidiaries is the subject which are material and which
         are not disclosed in the Registration Statement and the Prospectus,

                                       12
<PAGE>   13
         (vi) there are not any franchises, contracts, leases or other documents
         which are required to be filed as exhibits to the Registration
         Statement which have not been filed as required, (vii) the
         representations and warranties of the Company herein are true and
         correct in all material respects as of the Closing Date or any later
         date on which Option Stock is to be purchased, as the case may be, and
         (viii) there has not been any material change in the market for
         securities in general or in political, financial or economic conditions
         from those reasonably foreseeable as to render it impracticable in your
         reasonable judgment to make a public offering of the Stock, or a
         material adverse decline in the value of securities generally which
         render it inadvisable to proceed.

                  (e) You shall have received on the Closing Date and on any
         later date on which Option Stock is purchased a certificate, dated the
         Closing Date or such later date, as the case may be, and signed by the
         President and the Chief Financial Officer of the Company, stating that
         the respective signers of said certificate have carefully examined the
         Registration Statement in the form in which it originally became
         effective and the Prospectus contained therein and any supplements or
         amendments thereto, and that the statements included in clauses (i)
         through (vii) of paragraph (d) of this Section 9 are true and correct.

                  (f) You shall have received from Coopers & Lybrand L.L.P., a
         letter or letters, addressed to the Underwriters and dated the Closing
         Date and any later date on which Option Stock is purchased, confirming
         that they are independent public accountants with respect to the
         Company within the meaning of the Securities Act and the applicable
         published rules and regulations thereunder and based upon the
         procedures described in their letter delivered to you concurrently with
         the execution of this Agreement (herein called the Original Letter),
         but carried out to a date not more than three business days prior to
         the Closing Date or such later date on which Option Stock is purchased
         (i) confirming, to the extent true, that the statements and conclusions
         set forth in the Original Letter are accurate as of the Closing Date or
         such later date, as the case may be, and (ii) setting forth any
         revisions and additions to the statements and conclusions set forth in
         the Original Letter which are necessary to reflect any changes in the
         facts described in the Original Letter since the date of the Original
         Letter or to reflect the availability of more recent financial
         statements, data or information. The letters shall not disclose any
         change, or any development involving a prospective change, in or
         affecting the business or properties of the Company or any of its
         subsidiaries which, in your reasonable judgment, makes it impractical
         or inadvisable to proceed with the public offering of the Stock or the
         purchase of the Option Stock as contemplated by the Prospectus.

                  (g) You shall have been furnished evidence in usual written or
         telegraphic form from the appropriate authorities of the several
         jurisdictions, or other evidence satisfactory to you, of the
         qualification referred to in paragraph (f) of Section 6 hereof.

                  (h) Prior to the Closing Date, the Stock to be issued and sold
         by the Company shall have been duly authorized for listing by the
         Nasdaq National Market upon official notice of issuance.

                  (i) On or prior to the Closing Date, you shall have received
         from each of Thomas Kailath and the Selling Securityholders agreements,
         in form reasonably satisfactory to Hambrecht & Quist LLC, stating that
         without the prior written consent of Hambrecht & Quist LLC acting alone
         or each of Hambrecht & Quist LLC and Wessels, Arnold & Henderson L.L.C.
         acting jointly, such person or entity will not, for a period of 90 days
         following the Effective Date, directly or indirectly, (i) sell, offer,
         contract to sell, make any short sale, pledge, sell any option or
         contract to purchase, purchase any option or contract to sell, grant
         any option, right or warrant to purchase or otherwise transfer or
         dispose of any shares of Common Stock or any securities convertible
         into or exchangeable or exercisable for or any rights to purchase or
         acquire Common Stock or (ii) enter into any swap or other agreement
         that transfers, in whole or in part, any of the economic consequences
         or ownership of Common Stock, whether any such transaction described in
         clause (i) or (ii) above is to be settled by delivery of Common Stock
         or such other securities, in cash or otherwise.

                                       13
<PAGE>   14
         All the agreements, opinions, certificates and letters mentioned above
or elsewhere in this Agreement shall be deemed to be in compliance with the
provisions hereof only if Morrison & Foerster LLP, counsel for the Underwriters,
shall be reasonably satisfied that they comply in form and scope.

         In case any of the conditions specified in this Section 9 shall not be
fulfilled, this Agreement may be terminated by you by giving notice to the
Company and to the Selling Securityholders. Any such termination shall be
without liability of the Company or the Selling Securityholders to the
Underwriters and without liability of the Underwriters to the Company or the
Selling Securityholders; provided, however, that (i) in the event of such
termination, the Company and the Selling Securityholders agree to indemnify and
hold harmless the Underwriters from all costs or expenses incident to the
performance of the obligations of the Company and the Selling Securityholders
under this Agreement, including all costs and expenses referred to in paragraphs
(i) and (j) of Section 6 hereof, and (ii) if this Agreement is terminated by you
because of any refusal, inability or failure on the part of the Company or the
Selling Securityholders to perform any agreement herein, to fulfill any of the
conditions herein, or to comply with any provision hereof other than by reason
of a default by any of the Underwriters, the Company will reimburse the
Underwriters severally upon demand for all out-of-pocket expenses (including
reasonable fees and disbursements of counsel) that shall have been incurred by
them in connection with the transactions contemplated hereby.

         10. CONDITIONS OF THE OBLIGATION OF THE COMPANY AND THE SELLING
SECURITYHOLDERS. The obligation of the Company and the Selling Securityholders
to deliver the Stock shall be subject to the conditions that (a) the
Registration Statement shall have become effective and (b) no stop order
suspending the effectiveness thereof shall be in effect and no proceedings
therefor shall be pending or threatened by the Commission.

         In case either of the conditions specified in this Section 10 shall not
be fulfilled, this Agreement may be terminated by the Company and the Selling
Securityholders by giving notice to you. Any such termination shall be without
liability of the Company and the Selling Securityholders to the Underwriters and
without liability of the Underwriters to the Company or the Selling
Securityholders; provided, however, that in the event of any such termination
the Company and the Selling Securityholders jointly and severally agree to
indemnify and hold harmless the Underwriters from all costs or expenses incident
to the performance of the obligations of the Company and the Selling
Securityholders under this Agreement, including all costs and expenses referred
to in paragraphs (i) and (j) of Section 6 hereof.

         11. REIMBURSEMENT OF CERTAIN EXPENSES. In addition to their other
obligations under Section 7 of this Agreement (and subject, in the case of a
Selling Securityholder, to the provisions of paragraph (f) of Section 7), the
Company and the Selling Securityholders hereby jointly and severally agree to
reimburse on a quarterly basis the Underwriters for all reasonable legal and
other expenses incurred in connection with investigating or defending any claim,
action, investigation, inquiry or other proceeding arising out of or based upon
any statement or omission, or any alleged statement or omission, described in
paragraph (a) of Section 7 of this Agreement, notwithstanding the absence of a
judicial determination as to the propriety and enforceability of the obligations
under this Section 11 and the possibility that such payments might later be held
to be improper; provided, however, that (i) to the extent any such payment is
ultimately held to be improper, the persons receiving such payments shall
promptly refund them and (ii) such persons shall provide to the Company, upon
request, reasonable assurances of their ability to effect any refund, when and
if due.

         12. PERSONS ENTITLED TO BENEFIT OF AGREEMENT. This Agreement shall
inure to the benefit of the Company, the Selling Securityholders and the several
Underwriters and, with respect to the provisions of Section 7 hereof, the
several parties (in addition to the Company, the Selling Securityholders and the
several Underwriters) indemnified under the provisions of said Section 7, and
their respective personal representatives, successors and assigns. Nothing in
this Agreement is intended or shall be construed to give to any other person,
firm or corporation any legal or equitable remedy or claim under or in respect
of this Agreement or any provision herein contained. The term "successors and
assigns" as herein used shall not include any purchaser, as such purchaser, of
any of the Stock from any of the several Underwriters.

                                       14
<PAGE>   15
         13. NOTICES. Except as otherwise provided herein, all communications
hereunder shall be in writing or by telegraph and, if to the Underwriters, shall
be mailed, telegraphed or delivered to Hambrecht & Quist LLC, One Bush Street,
San Francisco, California 94104; and if to the Company, shall be mailed,
telegraphed or delivered to it at its office, 3260 Jay Street, Santa Clara,
California 95054-3309, Attention: Chief Financial Officer; and if to the Selling
Securityholders, shall be mailed, telegraphed or delivered to the Selling
Securityholders in care of Narenda Gupta at 3260 Jay Street, Santa Clara,
California 95054-3309. All notices given by telegraph shall be promptly
confirmed by letter.

         14. MISCELLANEOUS. The reimbursement, indemnification and contribution
agreements contained in this Agreement and the representations, warranties and
covenants in this Agreement shall remain in full force and effect regardless of
(a) any termination of this Agreement, (b) any investigation made by or on
behalf of any Underwriter or controlling person thereof, or by or on behalf of
the Company or the Selling Securityholders or their respective directors or
officers, and (c) delivery and payment for the Stock under this Agreement;
provided, however, that if this Agreement is terminated prior to the Closing
Date, the provisions of paragraph (l) of Section 6 hereof shall be of no further
force or effect.

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

         This Agreement shall be governed by, and construed in accordance with,
the laws of the State of California.

         Please sign and return to the Company and to the Selling
Securityholders in care of the Company the enclosed duplicates of this letter,
whereupon this letter will become a binding agreement among the Company, the
Selling Securityholders and the several Underwriters in accordance with its
terms.

                                          Very truly yours,

                                          INTEGRATED SYSTEMS, INC.


                                          By ___________________________________
                                              David P. St. Charles
                                              President, Chief Executive Officer


                                          SELLING SECURITYHOLDERS:
                                          Narendra K. Gupta
                                          David P. St. Charles
                                          Marco Thompson


                                          By ___________________________________
                                                      [Attorney-in-Fact]


The foregoing Agreement is hereby confirmed
and accepted as of the date first above written.

HAMBRECHT & QUIST LLC

                                       15
<PAGE>   16
WESSELS, ARNOLD & HENDERSON, L.L.C.
  By Hambrecht & Quist LLC


By ___________________________
         Managing Director

Acting on behalf of the several Underwriters,
including themselves, named in Schedule I hereto.


                                       16
<PAGE>   17
                                   SCHEDULE I

                                  UNDERWRITERS

<TABLE>
<CAPTION>
                                                                  NUMBER OF SHARES
UNDERWRITERS                                                      TO BE PURCHASED
<S>                                                               <C>
Hambrecht & Quist LLC.........................................         900,000

Wessels, Arnold & Henderson, L.L.C............................         900,000
                                                                     ---------


Total.........................................................       1,800,000
                                                                     ---------
</TABLE>

                                       17
<PAGE>   18
                                   SCHEDULE II

                             SELLING SECURITYHOLDERS

<TABLE>
<CAPTION>
NAME OF SELLING SECURITYHOLDERS                         NUMBER OF SHARES
                                                           TO BE SOLD
<S>                                                     <C>
Narendra and Vinita Gupta.............................     1,020,000

David P. St. Charles..................................       160,000

Marco Thompson........................................       120,000
                                                           ---------

Total.................................................     1,300,000
                                                           ---------
</TABLE>

                                       18
<PAGE>   19
                                     ANNEX A

           MATTERS TO BE COVERED IN THE OPINION OF FENWICK & WEST LLP
                            COUNSEL FOR THE COMPANY
                        AND THE SELLING SECURITYHOLDERS

                  (i) Each of the Company and its subsidiaries has been duly
         incorporated and is validly existing as a corporation in good standing
         under the laws of the jurisdiction of its incorporation, is duly
         qualified as a foreign corporation and in good standing in each state
         of the United States of America in which its ownership or leasing of
         property requires such qualification (except where the failure to be so
         qualified would not have a material adverse effect on the business,
         properties, financial condition or results of operations of the Company
         and its subsidiaries, taken as a whole), and has full corporate power
         and authority to own or lease its properties and conduct its business
         as described in the Registration Statement; all the issued and
         outstanding capital stock of each of the subsidiaries of the Company
         has been duly authorized and validly issued and is fully paid and
         nonassessable, and is owned by the Company free and clear of all liens,
         encumbrances and security interests, and to the best of such counsel's
         knowledge, no options, warrants or other rights to purchase, agreements
         or other obligations to issue or other rights to convert any
         obligations into shares of capital stock or ownership interests in such
         subsidiaries are outstanding;

                  (ii) the authorized capital stock of the Company consists of
                   shares of Common Stock, $  -   par value, of which there are
         outstanding          shares (including the Underwritten Stock plus the
         number of any shares of Option Stock issued on the date hereof); 
         proper corporate proceedings have been taken validly to authorize such
         authorized capital stock; all of the outstanding shares of such 
         capital stock (including the Underwritten Stock and the shares of 
         Option Stock issued, if any) have been duly and validly issued and 
         are fully paid and nonassessable; any Option Stock purchased after 
         the Closing Date, when issued and delivered to and paid for by the 
         Underwriters as provided in the Underwriting Agreement, will have been
         duly and validly issued and be fully paid and nonassessable; and no 
         preemptive rights of, or rights of refusal in favor of, 
         securityholders exist with respect to the Stock, or the issue and 
         sale thereof, pursuant to the Articles of Incorporation or Bylaws of 
         the Company and, to the knowledge of such counsel, there are no 
         contractual preemptive rights that have not been waived, rights of 
         first refusal or rights of co-sale which exist with respect to the 
         Stock being sold by the Selling Securityholders or the issue and sale 
         of the Stock;

                  (iii) the Registration Statement has become effective under
         the Securities Act and, to the best of such counsel's knowledge, no
         stop order suspending the effectiveness of the Registration Statement
         or suspending or preventing the use of the Prospectus is in effect and
         no proceedings for that purpose have been instituted or are pending or
         contemplated by the Commission;

                  (iv) the Registration Statement and the Prospectus (except as
         to the financial statements and schedules and other financial data
         contained therein, as to which such counsel need express no opinion)
         comply as to form in all material respects with the requirements of the
         Securities Act, the Exchange Act and with the rules and regulations of
         the Commission thereunder;

                  (v) such counsel have no reason to believe that the
         Registration Statement (except as to the financial statements and
         schedules and other financial data contained or incorporated by
         reference therein, as to which such counsel need not express any
         opinion or belief) at the Effective Date contained any untrue statement
         of a material fact or omitted to state a material fact required to be
         stated therein or necessary to make the statements therein not
         misleading, or that the Prospectus (except as to the financial
         statements and schedules and other financial data contained or
         incorporated by reference therein, as to which such counsel need not
         express any opinion or belief) as of its date or at the Closing Date
         (or any later date on which Option Stock is purchased), contained or
         contains any untrue statement of a material

                                       19
<PAGE>   20
         fact or omitted or omits to state a material fact necessary in order to
         make the statements therein, in light of the circumstances under which
         they were made, not misleading;

                  (vi) the information required to be set forth in the
         Registration Statement in answer to Items 9 and 10 (insofar as it
         relates to such counsel) of Form S-3 is to the best of such counsel's
         knowledge accurately and adequately set forth therein in all material
         respects or no response is required with respect to such Items, and, to
         the best of such counsel's knowledge, the description of the Company's
         stock option plans and the options granted and which may be granted
         thereunder set forth or incorporated by reference in the Prospectus
         accurately and fairly presents the information required to be shown
         with respect to said plans and options to the extent required by the
         Securities Act and the rules and regulations of the Commission
         thereunder;

                  (vii) The statements under the captions "Risk Factors --
         Acquisition-Related Risks," "Risk Factors -- Risk of Product Defect;
         Product and Other Liability," "Risk Factors -- Limited Protection of
         Proprietary Technology" "Risk Factors --Dependence on Licenses from
         Third Parties," "Risk Factors --Concentration of Stock Ownership,"
         "Business-Proprietary Rights," and "Selling Shareholders" in the
         Prospectus and the Registration Statement insofar as such statements
         constitute a summary of legal matters, documents or proceedings
         referred to therein, fairly present the information called for with
         respect to such legal matters, documents and proceedings;

                  (viii) such counsel do not know of any franchises, contracts,
         leases, documents or legal proceedings, pending or threatened, which in
         the opinion of such counsel are of a character required to be described
         in the Registration Statement or the Prospectus or to be filed as
         exhibits to the Registration Statement, which are not described and
         filed as required;

                  (ix) the Underwriting Agreement has been duly authorized,
         executed and delivered by the Company;

                  (x) based insofar as factual matters are concerned solely upon
         certificates of the Selling Securityholders, the accuracy of which we
         have no reason to question, (A) the Underwriting Agreement has been
         duly executed and delivered by or on behalf of each of the Selling
         Securityholders; (B) the Custody Agreement between the Selling
         Securityholders and    -   , as Custodian, and the Power of Attorney
         referred to in such Custody Agreement have been duly executed and
         delivered by such Selling Securityholder; (C) the Custody Agreement
         entered into by, and the Power of Attorney given by, such Selling
         Securityholder is valid and binding on such Selling Securityholder; and
         (D) each Selling Securityholder has full legal right and authority to
         enter into the Underwriting Agreement and to sell, transfer and deliver
         in the manner provided in the Underwriting Agreement the shares of
         Stock sold by such Selling Securityholder hereunder;

                  (xi) the issue and sale by the Company of the shares of Stock
         sold by the Company as contemplated by the Underwriting Agreement will
         not conflict with, or result in a breach of, the Articles of
         Incorporation or Bylaws of the Company or any of its subsidiaries or
         any agreement or instrument known to such counsel to which the Company
         or any of its subsidiaries is a party or any applicable law or
         regulation, or so far as is known to such counsel, any order, writ,
         injunction or decree, of any jurisdiction, court or governmental
         instrumentality;

                  (xii) all holders of securities of the Company having rights
         to the registration of shares of Common Stock, or other securities,
         because of the filing of the Registration Statement by the Company have
         waived such rights or such rights have expired by reason of lapse of
         time following notification of the Company's intent to file the
         Registration Statement;

                  (xiii) good and marketable title to the shares of Stock sold
         by the Selling Securityholders under the Underwriting Agreement, free
         and clear of all liens, encumbrances, equities, security interests and
         claims, has been transferred to the Underwriters who have severally
         purchased such shares of Stock under

                                       20
<PAGE>   21
         the Underwriting Agreement, assuming for the purpose of this opinion
         that the Underwriters purchased the same in good faith without notice
         of any adverse claims;

                  (xiv) based insofar as factual matters with respect to the
         stock to be sold by the Selling Securityholders are concerned solely
         upon certificates of the Selling Securityholders, the accuracy of which
         such counsel have no reason to question,] no consent, approval,
         authorization or order of any court or governmental agency or body is
         required for the consummation of the transactions contemplated in the
         Underwriting Agreement, except such as have been obtained under the
         Securities Act and such as may be required under state securities or
         blue sky laws in connection with the purchase and distribution of the
         Stock by the Underwriters; and

                  (xv) the Stock sold by the Selling Securityholders is listed
         and duly admitted to trading on the Nasdaq National Market, and the
         Stock issued and sold by the Company will been duly authorized for
         listing by the Nasdaq National Market upon official notice of issuance.

                                       21

<PAGE>   1
                                                                Exhibit 5.01


                                        April 11, 1996


Integrated Systems, Inc.
3260 Jay Street
Santa Clara, California 94103-4945

                RE: REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

        At your request, we have examined the Registration Statement on Form
S-3 submitted by you for filing with the Securities and Exchange Commission 
on April 11, 1996 (the "Registration Statement") in connection with the
registration under the Securities Act of 1933, as amended, of up to 2,070,000
shares of your Common Stock (each a "Share"), up to 1,570,000 of which are
presently issued and outstanding or will be issued pursuant to the exercise of
options and outstanding prior to the date of the closing of the offering, and 
will be sold by certain Selling Stockholders (the "Selling Stockholders").

        As your securities counsel, we have examined the proceedings taken or to
be taken by you in connection with the issuance by you of the up to 1,570,000
Shares that may be sold by the Selling Stockholders. We have also examined the
proceedings taken by you in connection with the proposed issuance of the up to
500,000 Shares that may be sold by you.

        It is our opinion that the up to 1,570,000 Shares that may be sold by
the Selling Stockholders are, or upon the exercise of options, when issued and
sold in the manner providedin such option documents will be, legally issued,
fully paid and nonassessable, and the up to 500,000 Shares that may be issued 
and sold by you, when issued and sold in the manner referred to in the 
Registration Statement, will be legally issued, fully paid and nonassessable.

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


                                        Very truly yours,



                                        FENWICK & WEST


<PAGE>   1
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
     We consent to the inclusion in this registration statement on Form S-3
(File No. 333-     ) of our report dated March 27, 1996, on our audit of the
consolidated financial statements of Integrated Systems, Inc. and the
incorporation by reference in this registration statement of our report dated
March 27, 1996 on the financial statement schedule of Integrated Systems, Inc.
appearing in the Company's 1996 Annual Report on Form 10-K. We also consent to
the reference to our firm under the caption "Experts."
 
                                          COOPERS & LYBRAND L.L.P.
 
San Jose, California
April 11, 1996


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