Document:

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                                                                     EXHIBIT 4.3

                          MISSION SYSTEMS, INCORPORATED

                        1996 EQUITY INCENTIVE STOCK PLAN

1.   PURPOSE.

This 1996 Equity Incentive Stock Plan (the "Plan") is intended to provide
incentives: (a) to officers and other employees of Mission Systems, Inc. (the
"Company"), and any present or future parent or subsidiary of the Company
(collectively, "Related Corporations"), by providing them with opportunities to
purchase stock in the Company pursuant to options granted hereunder, which
qualify as "incentive stock options"("ISOs") under Section 422(b) of the
Internal Revenue Code of 1986, as amended (the "Code"); (b) to directors,
officers, employees and consultants of the Company and Related Corporations by
providing them with opportunities to purchase stock in the Company pursuant to
options granted hereunder, which do not qualify as ISOs but as "nonqualified
options" ("NQs") and (c) to directors, officers, employees and consultants of
the Company and Related Corporations by providing them with awards of stock of
the Company "Awards" ). Both ISOs and NQs are referred to hereafter individually
as an "Option" and collectively as "Options". Options and Awards are referred to
hereafter collectively as "Stock Rights". As used herein, the terms "parent" and
"subsidiary" mean "parent corporation" and "subsidiary corporation"
respectively, as those terms are defined in Section 424 of the Code.

2.   ADMINISTRATION OF THE PLAN.

     A.   BOARD OR COMMITTEE ADMINISTRATION.

     The Plan shall be administered by the Board of Directors of the Company the
     ("Board") or by a committee appointed by the Board (the "Committee")
     provided that, to the extent required by Rule 16b-3 promulgated under the
     Securities Exchange Act of 1934 or any successor provision ("Rule 16b-3"),
     with respect to specific grants of Stock Rights, the Plan shall be
     administered by a disinterested administrator or administrators within the
     meaning of Rule 16b-3. All references to this Plan to the Committee shall
     mean the Board if a Committee has not been appointed. Subject to
     ratification of the grant of each Stock Right by the Board (if so required
     by applicable state law), and subject to the terms of the Plan, the
     Committee shall have the authority to (i) determine the employees of the
     Company and Related Corporations (subject to paragraph 3) to whom ISOs
     shall be granted, and determine (subject to paragraph 3) to whom NQs and
     Awards may be granted, (ii) determine the time or times at which Options or
     Awards shall be granted (iii) determine the exercise price of shares
     subject to each Option, which price shall not be less than the minimum
     price specified in paragraph 6; (iv) determine whether each Option granted
     shall be an ISO or an NQ (v) determine (subject to paragraph 7) the time or
     times when each Option shall become exercisable and the duration of the
     exercise period; (vi) determine whether restrictions such as repurchase
     options are to be imposed in shares subject to Options and Awards and the
     nature of such restrictions, if any, (vii) interpret the

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     Plan and prescribe and rescind rules and regulations relating to it; and
     (viii) resolve any disputes relating to the Plan or any Stock Rights issued
     pursuant to the Plan. If the Committee determines to issue an NQ, it shall
     take whatever actions it deems necessary, under Section 422 of the Code and
     applicable regulations, to ensure that such Option is not treated as an
     ISO. The interpretation and construction by the Committee of any provision
     of the Plan or any Stock Grant granted under it shall be final unless
     otherwise determined by the Board. The Committee may from time to time
     adopt such rules and regulations for carrying out the Plan as it may deem
     best. No member of the Board or Committee shall be liable for any action or
     determination made in good faith with respect to the Plan, or any Stock
     Right granted under it.

     B.   COMMITTEE ACTIONS.

     The Committee may select one of its members as chairman and shall hold
     meetings at such times and places as it may determine. Acts by a majority
     of the members of the Committee, or acts reduced to, or approved in writing
     by a majority of the members of the Committee (if consistent with
     applicable state law), shall constitute the valid acts of the Committee.
     From time to time the Board may increase the size of the Committee and
     appoint additional members, remove members (with or without cause) and
     appoint members in substitution, fill vacancies however caused, or remove
     all members of the Committee and thereafter directly administer the Plan.

3.   ELIGIBLE EMPLOYEES AND OTHERS.

ISOs may be granted only to employees of the Company or any Related Corporation.
NQs and Awards may be granted to any employee, officer, director (whether or not
also an employee) or consultant of the Company, or any Related Corporation. The
Committee may take into consideration a recipient's individual circumstances in
determining whether to grant an ISO, an NQ, or an Award. Granting of any Stock
Right to any individual or entity shall neither entitle that individual or
entity to, or disqualify him, her, or it from, participation in any other grant
of Stock Rights.

4.   STOCK

The stock subject to Options and Awards shall be authorized but unissued shares
of Class B Common Non-Voting Stock of the Company, no par value per share (the
"Common Stock"), or shares of Common Stock reacquired by the Company in any
manner. The aggregate number of shares which may be issued pursuant to the Plan
is 200,000, subject to adjustments as provided in paragraph 13. If any Stock
Right granted under the Plan shall expire or terminate for any reason without
having been exercised in full, or shall cease for any reason to be exercisable
in whole or in part, the unpurchased shares subject to such Stock Right shall
again be available for grants of Stock Rights under the Plan.

5.   GRANTING OF STOCK RIGHTS.

Stock Rights may be granted under the Plan at any time after April 25, 1996 and
prior to December 31, 2005. The date of grant of a Stock Right under the plan
will be the date specified

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by the Committee at the time it grants the Stock Right, provided, however, that
such date shall not be prior to the date on which the Committee acts to approve
the grant.

6.   MINIMUM OPTION PRICE; ISO LIMITATIONS.

     A.   PRICE FOR NON-QUALIFIED OPTIONS.

     The exercise price per share specified in the agreement relating to each NQ
     granted under the Plan shall in no event be less than the minimum legal
     consideration required therefor under the laws of New Hampshire, or the
     laws of any jurisdiction in which the Company or its successors in interest
     may be organized.

     B.   PRICE FOR ISOs.

     The exercise price per share specified in the agreement relating to each
     ISO granted under the Plan shall not be less than fair market value per
     share of Common Stock on the date of such grant. In the case of an ISO
     granted to an employee owning stock possessing more than ten percent (10%)
     of the total combined voting power of all classes of stock of the Company,
     or any Related Corporation, the price per share specified in the agreement
     relating to such ISO shall not be less than one hundred ten percent (110%)
     of the fair market value per share of Common Stock on the date of grant.
     For purposes of determining stock ownership under this paragraph, the rules
     of Section 424(d) of the Code shall apply.

     C.   $100,000 ANNUAL LIMITATION ON ISO VESTING.

     Each eligible employee may be granted Options treated as ISOs only to the
     extent that, in the aggregate under this Plan and all incentive stock
     option plans of the Company and any Related Corporation, ISOs do not become
     exercisable for the first time by such employee during any calendar year
     with respect to stock having a fair market value (determined at the time
     ISOs were granted) in excess of $100,000. The Company intends to designate
     any Options granted in excess of such limitations as NQs.

     D.   DETERMINATION OF FAIR MARKET VALUE.

     If, at the time an Option is granted under the Plan, Company's stock is
     publicly traded, "fair market value" shall be determined as of the last
     business day for which the prices or discussed in this sentence are
     available prior to the date such Option is granted and shall mean (i) the
     average (on the date) of the high and low prices of the Common Stock on the
     principal national securities exchange on which the Common Stock is traded,
     if the Common Stock is then traded on a national securities exchange; or
     (ii) the last reported sale price (on that date) of the Common Stock on the
     NASDAQ National Market List, if the Common Sock is not then traded on a
     national securities exchange; or (iii) the closing bid price (or the
     average of bid prices ) last quoted (on that date) by an established
     quotation service for over-the-counter securities, if the Common Stock is
     not reported on the NASDAQ National Market List. However, if the Common
     Stock is not

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     publicly traded at the time an Option is granted under the Plan, "fair
     market value" shall be deemed to be the fair value of the Common Stock as
     determined by the Committee after taking into consideration all factors
     which it deems appropriate, including, without limitation, recent sale and
     offer prices of the Common Stock in private transactions negotiated at
     arm's length.

7.   OPTION DURATION.

Subject to earlier termination as provided in paragraphs 9 and 10, each Option
shall expire on the date specified by the Committee, but not more than (i) ten
(10) years from the date of grant in the case of Options generally, and (ii)
five (5) years from the date of grant in the case of ISOs granted to an employee
owning stock possessing more than then percent (10%) of the total combined
voting power of all classes of stock of the Company, or any Related Corporation,
as determined under paragraph 6(B). Subject to earlier termination as provided
in paragraphs 9 and 10, the term of each ISO shall be the term set forth in the
original instrument granting such ISO, except with respect to any part of such
ISO that is converted into an NQ pursuant to paragraph 16.

8.   EXERCISE OF OPTION.

Subject to the provisions of paragraphs 9 through 12, each Option granted under
the Plan shall be exercisable as follows:

     A.   VESTING.

     The Option shall either be fully exercisable on the date of the grant, or
     shall become exercisable thereafter in such installments as the Committee
     may specify.

     B.   FULL VESTING OF INSTALLMENTS.

     Once an installment becomes exercisable, it shall remain exercisable until
     expiration or termination of the Option, unless otherwise specified by the
     Committee.

     C.   PARTIAL EXERCISE.

     Each Option or installment may be exercised at any time, or from time to
     time, in whole or in part, for up to the total number of shares with
     respect to which it is then exercisable.

     D.   ACCELERATION OF VESTING.

     The Committee shall have the right to accelerate the date of exercise of
     any installment of any Option, provided that the Committee shall not,
     without the consent of the optionee, accelerate the exercise date of any
     installment of any Option granted to any employee as an ISO (and not
     previously converted into an NQ pursuant to paragraph 16) if such
     acceleration would violate the annual vesting limitation contained in
     Section 422(d) of the Code, as described in paragraph 6(C).

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9.       TERMINATION OF EMPLOYMENT.

                  A.       TERMINATION FOR CAUSE OR RESIGNATION.

                  If an ISO optionee resigns without the written permission of
                  the Company, or is terminated for cause during the vesting
                  period of any Option, any such Option shall terminate
                  immediately, to the extent not previously exercised. Further,
                  the Company shall have the fight, but not the obligation, to
                  purchase from the optionee all, or any portion of the shares
                  obtained pursuant to the Plan, at any reasonable price in
                  excess of the exercise price, as determined by the Board or
                  Committee.

                  B.       TERMINATION FOR OTHER THAN DEATH AND DISABILITY.

                  If an ISO optionee ceases to be employed by the Company and
                  all Related Corporations other than as defined in paragraph 9
                  (A) above, or by reason of death or disability as defined in
                  paragraph 10, no further installments of his ISOs shall become
                  exercisable, and his / her ISOs shall terminate after the
                  passage of five (5) business days from the date of termination
                  of his / her employment, but in no event later than on their
                  specified expiration dates, except to the extent that such ISO
                  (or unexercised installment thereof) have been converted into
                  NQs pursuant to paragraph 16. For the purposes of this
                  paragraph 9, employment shall be considered as continuing
                  uninterrupted during any bona fide leave of absence (such as
                  those attributable to illness, military obligations or
                  governmental service) provided that the period of such leave
                  does not exceed ninety (90) days, or, if longer, any period
                  during which such optionee's reemployment is guaranteed by
                  statute. A bona fide absence with the written approval of the
                  Committee shall not be considered an interruption of
                  employment under this paragraph 9, provided that such written
                  approval contractually obligates the Company, or any Related
                  Corporations to continue the employment of the optionee after
                  the expiration of the approved period of absence. ISOs granted
                  under the Plan shall not be affected by any change in
                  employment within, or among the Company and Related
                  Corporations, so long as the optionee continues to be an
                  employee of the Company or any Related Corporation. Nothing in
                  the Plan shall be deemed to give any guarantee of any Stock
                  Fight the fight to be retained in employment, or other service
                  by the Company or any Related Corporation for any period of
                  time.

10.      DEATH, DISABILITY.

                  A.       DEATH.

                  If an ISO optionee ceases to be employed by the Company and
                  all Related Corporations by reason of his / her death, any ISO
                  of his / hers may be exercised, to the extent of the number of
                  shares with respect to which he / she could have exercised it
                  on the date of his / her death, by his estate, personal
                  representative or beneficiary, who has acquired the ISO by
                  will, or by the laws of descent and distribution, at any time
                  prior to the earlier of the specified expiration date of the
                  ISO, or 180 days from the date of the optionee's death.

                  B.       DISABILITY.

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                  If an ISO optionee ceases to be employed by the Company and
                  all Related Corporations by reason of his / her disability
                  he/she shall have the right to exercise any ISO held by him
                  her on the date of termination of employment, to the extent
                  of the number of shares with respect to which he / she could
                  have exercised it on that date, at any time prior the earlier
                  of the specified expiration date of the ISO, or 180 days
                  from the date of the termination of the optionee's
                  employment. For the purposes of the Plan, the term
                  "disability" shall mean "permanent and total disability" as
                  defined in Section 22(e)(3) of the Code or any successor
                  statute.

11.      ASSIGNABILITY.

No Stock Right shall be assignable or transferable by the grantee except by
will, or by the laws of descent and distribution. During the lifetime of the
grantee each Stock Right shall be exercisable only by him / her.

12.      TERMS AND CONDITIONS OF OPTIONS.

Options shall be evidenced by instruments (which need not be identical) in such
form as the Committee may from time to time approve. Such instruments shall
conform to the terms and conditions set forth in paragraphs 6 through 11 hereof
and may contain such other provisions as the Committee deems advisable which are
not inconsistent with the Plan, including restrictions applicable to shares of
Common Stock issuable upon exercise of Options. The Committee may specify that
any NQ shall be subject to the restrictions set forth herein with respect to
ISOs, or to such other termination and cancellation provisions as the Committee
may determine. The Committee may from time to time confer authority and
responsibility on one or more of its own members and / or one or more officers
of the Company to execute and deliver such instruments. The proper officers of
the Company are authorized and directed to take any and all actions necessary or
advisable from time to time to carry out the terms of such instruments.

13.      ADJUSTMENTS.

Upon the occurrence of any of the following events, an optionee's rights with
respect to Options granted to him / her hereunder, shall be adjusted as
hereinafter provided, unless otherwise specifically provided in the written
agreement between the optionee and the Company relating to such Option:

                  A.       STOCK DIVIDENDS AND STOCK SPLITS.

                  If the shares of Common Stock shall be subdivided or combined
                  into a greater or lesser number of shares, or if the Company
                  shall issue any shares of Common Stock as a stock dividend on
                  its outstanding Common Stock, the number of shares of Common
                  Stock deliverable upon the exercise of Options shall be
                  appropriately increased or decreased proportionately, and
                  appropriate adjustments shall be made in the purchase price
                  per share to reflect such subdivision, combination or stock
                  dividend.

                  B.       CONSOLIDATIONS OR MERGERS.

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                  If the Company is to be consolidated with, or acquired by
                  another entity in a merger, sale of all, or substantially all
                  of the Company's assets, or otherwise (an "Acquisition"), the
                  Committee, or the board of directors of such entity assuming
                  the obligations of the Company hereunder (the "Successor
                  Board"), shall, as to outstanding Options, either (i) make
                  appropriate provisions for the continuation of such Options,
                  by substituting, on an equitable basis, for the shares then
                  subject to such Options the consideration payable with respect
                  to the outstanding shares of Common Stock in connection with
                  the Acquisition; or (ii) upon written notice to the optionees,
                  provide that all Options must be exercised, to the extent then
                  exercisable, within the specified number of days from the date
                  of such notice; at the end of which period the Options shall
                  terminate; or (iii) terminate all Options in exchange for a
                  cash payment equal to the excess of the fair market value of
                  the shares subject to such Options (to the extent then
                  exercisable) over the exercise price thereof.

                  C.       RECAPITALIZATION OR REORGANIZATION.

                  In the event of a recapitalization reorganization of the
                  Company (other than a transaction described in subparagraph B
                  above) pursuant to which securities of the Company, or of
                  another corporation, are issued with respect to the
                  outstanding shares of Common Stock, an optionee, upon
                  exercising an Option, shall be entitled to receive, for the
                  purchase price paid upon such exercise, the securities
                  he/she would have received, if he / she had exercised his/her
                  Option prior to such recapitalization, or reorganization.

                  D.       MODIFICATION OF ISOS.

                  Notwithstanding the foregoing, any adjustments made with
                  respect to ISOs, pursuant to subparagraph A, B or C above,
                  shall be made only after the Committee, after consulting with
                  counsel for the Company, determines whether such adjustments
                  would constitute a "modification" of such ISOs (as that term
                  is defined in Section 424 of the Code), or would cause any
                  adverse tax consequences for the holders of such ISOs. If the
                  Committee determines that such adjustments made with respect
                  to ISOs would constitute a modification of such ISOs, or would
                  cause adverse tax consequences to the holders, it may refrain
                  from making such adjustments.

                  E.       DISSOLUTION OR LIQUIDATION.

                  In the event of the proposed dissolution or liquidation of the
                  Company, each Option will terminate immediately prior to the
                  consummation of such proposed action, or at such other time
                  and subject to such other conditions as shall be determined by
                  the Committee.

                  F.       ISSUANCE OF SECURITIES.

                  Except as expressly provided herein, no issuance by the
                  Company of the shares of stock of any class, or securities
                  convertible into shares of stock of any class of stock, shall
                  effect, and no adjustments by reason thereof shall affect or
                  result in an adjustment to the number, or price of shares
                  subject to Options. No adjustments

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                  shall be made for dividends paid in cash, or in property other
                  than securities of the Company.

                  G.       FRACTIONAL SHARES.

                  No fractional shares shall be issued under the Plan and the
                  optionee shall receive from the Company cash in lieu of such
                  fractional shares.

                  H.       ADJUSTMENTS.

                  Upon the happening of any of the events described in
                  subparagraphs A, B or C above, the class and aggregate number
                  of shares set forth in subparagraph 4 hereof that are subject
                  to Stock Rights which previously have been, or subsequently
                  may be granted under the Plan, shall also be appropriately
                  adjusted to reflect the events described in such
                  subparagraphs. The Committee, or the Successor Board, shall
                  determine the specific adjustments to be made under this
                  paragraph 13 and, subject to paragraph 2, its determination
                  shall be conclusive.

14.      MEANS OF EXERCISING OPTIONS.

A Stock Right (or any part or installment thereof) shall be exercised by giving
written notice to the Company at its principal office address. Such notice shall
identify the Stock Right being exercised and specify the number of shares as to
which such Stock Right is being exercised, accompanied by full payment of the
purchase price therefor, either (a) in United States dollars, in cash or by
check, (b) at the discretion of the Committee, through delivery of shares of
Common Stock having a fair market value equal, as of the date of exercise, to
the cash exercise price of the Stock Rights, (c) at the discretion of the
Committee, by delivery of the grantee's personal recourse note, bearing interest
payable, not less than annually, at no less than one hundred percent (100%) of
the lowest applicable Federal rate, as defined in Section 1274(d) of the Code,
(d) at the discretion of the Committee and consistent with applicable law,
through the delivery of an assignment to the Company, of a sufficient amount of
the proceeds from the sale of the Common Stock acquired upon exercise of the
Stock Right, and an Authorization to the broker, or selling agent, to pay that
amount to the Company, which sale shall be at the participant's direction at,
the time of the exercise, or (e) at the discretion of the Committee, by any
combination of (a), (b), (c) or (d) above. If the Committee exercises its
discretion to permit payment of the exercise price of an ISO by means of the
methods set forth in clauses (a), (b), (c), (d) or (e) of the preceding
sentence, such discretion shall be exercised in writing at the time of the grant
of the ISO in question. The holder of a Stock Right shall not have the fights of
a shareholder with respect to the shares covered by this Stock Right, until the
date of issuance of a stock certificate to him/ her for such shares. Except as
expressly provided above in paragraph 13, with respect to changes in
capitalization and stock dividends, no adjustment shall be made for dividends,
or similar fights for which the record date is before the date such stock
certificate is issued.

15.      TERM AND AMENDMENT OF PLAN.

This Plan was adopted by the Board and shareholder on March 8, 1996 and shall
expire at the end of the day on December 31, 2005 (except as to Options
outstanding on that date). The Board may terminate or amend the Plan at any
time, except that, without the approval of the stockholders obtained within
twelve (12) months before or after the Board adopts the resolution

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authorizing any of the following actions, (a) the total number of shares that
may be issued under the Plan may not be increased (except by adjustment pursuant
to paragraph 13), (b) the benefits accruing to participants under the Plan may
not be materially increased, (c) the requirement as to eligibility for
participation in the Plan may not be materially modified; (d) the provisions of
paragraph 3 regarding eligibility for grants of ISOs may not be modified; (e)
the provision of paragraph 6(B) regarding the exercise price at which shares may
be offered pursuant to ISOs may not be modified (except by adjustment pursuant
to paragraph 13); (f) the expiration date of the Plan may not be extended; and
(g) the Board may not take any action which would cause the Plan to fail to
comply with Rule 16b-3. Except as otherwise provided in this paragraph 15, in no
event may action of the Board or the stockholders alter or impair the fights of
the grantee, without his consent, under any Stock Right previously granted to
him.

16. CONVERSION OF ISOS INTO NON-QUALIFIED OPTIONS.

The Committee, at the written request or with the written consent of any
optionee, may in its discretion take such actions as may be necessary to convert
such optionee's ISO's (or any installment or portions of installments thereof)
that have not been exercised on the date of conversion, into NQs, at any time
prior to the expiration of such ISOs, regardless of whether such optionee is an
employee of the Company or a Related Corporation at the time of such conversion.
Such actions may include, but not be limited to, extending the exercise period,
or reducing the exercise price of the appropriate installment of such ISOs. At
the time of such conversion, the Committee (with the consent of the optionee)
may impose such conditions on the exercise of the resulting NQs as the Committee
in its discretion may determine, provided that such conditions shall not be
inconsistent with this Plan. Nothing in the Plan shall be deemed to give the
optionee the right to have such optionee's ISO's converted into NQs and no such
conversion shall occur until and unless the Committee takes appropriate action.

17.      APPLICATION OF FUNDS.

The proceeds received by the Company from the sale of shares pursuant to Options
granted under the Plan, shall be used for general corporate purposes.

18.      NOTICE TO COMPANY OF DISQUALIFYING DISPOSITION.

By accepting an ISO granted under the Plan, each optionee agrees to notify the
Company in writing immediately after he makes a Disqualifying Disposition (as
described in Sections 421, 422 and 424 of the Code and the regulations
thereunder) of any stock acquired pursuant to the exercise of ISOs granted under
the Plan. A Disqualifying Disposition is generally any disposition occurring
within two years of the date the ISO was granted, or within one year of the date
the ISO was exercised, whichever period ends later.

19.      WITHHOLDING OF ADDITIONAL INCOME TAXES.

Upon the exercise of an NQ or the grant of an Award for less than its fair
market value, the making of a Disqualifying Disposition (as defined in paragraph
18), the vesting or transfer of restricted stock or securities acquired on the
exercise of a Stock Right hereunder, or the making of a distribution or other
payment with respect to such stock or securities, the Company may withhold taxes
for amounts that constitute compensation includable in gross income. The
Committee in its discretion may condition (i) the exercise of an Option, (ii)
the grant of an Award, or (iii) the vesting or transferability of restricted
stock or securities acquired by

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exercising a Stock Right, on the grantee's making satisfactory arrangement for
such withholding. Such arrangement may include payment by the grantee in cash or
by check of the amount of the withholding taxes or, at the discretion of the
Committee an agreement for the withholding or offset against any compensation
due to grantee by the Company, or, by the grantee's delivery of previously held
shares of Common Stock otherwise deliverable upon exercise of a Stock Right
shares, having an aggregate fair market value equal to the amount of such
withholding taxes.

20.      GOVERNMENTAL REGULATION.

The Company's obligation to sell and deliver shares of the Common Stock under
this Plan is subject to the approval of any governmental authority required in
connection with the authorization, issuance or sale of such shares. Government
regulations may impose reporting or other obligations on the Company with
respect to the Plan. For example, the Company may be required to send tax
information statements to employees and former employees that exercise ISOs
under the Plan, and the Company may be required to file tax information returns
reporting the income received by grantees of Stock Rights in connection with the
Plan.

21.      GOVERNING LAW: CONSTRUCTION.

The validity and construction of the Plan and the instrument evidencing Stock
Rights shall be governed by the laws of the State of New Hampshire, or the laws
of any jurisdiction in which the Company, or its successors in interest, may be
organized. In construing this Plan, the singular shall include the plural,
unless the context otherwise requires.<PAGE>   1

                                                                     EXHIBIT 4.4

                            FIRSTSENSE SOFTWARE, INC.
                            1997 STOCK INCENTIVE PLAN

1.       PURPOSE

                  The purpose of this 1997 Stock Incentive Plan (the "Plan") of
         FirstSense Software, Inc., a Delaware corporation (the "Company"), is
         to advance the interests of the Company's stockholders by enhancing the
         Company's ability to attract, retain and motivate persons who make (or
         are expected to make) important contributions to the Company by
         providing such persons with equity ownership opportunities and
         performance-based incentives and thereby better aligning the interests
         of such persons with those of the Company's stockholders. Except where
         the context otherwise requires, the term "Company" shall include any
         present or future subsidiary corporations of FirstSense Software, Inc.,
         as defined in Section 424(f) of the Internal Revenue Code of 1986, as
         amended, and any regulations promulgated thereunder (the "Code").

         2.       ELIGIBILITY

                  All of the Company's employees, officers, directors,
         consultants and advisors are eligible to be granted options, restricted
         stock, or other stock-based awards (each, an "Award") under the Plan.
         Any person who has been granted an Award under the Plan shall be deemed
         a "Participant."

         3.       ADMINISTRATION, DELEGATION

                  (a) ADMINISTRATION BY BOARD OF DIRECTORS. The Plan will be
         administered by the Board of Directors of the Company (the "Board").
         The Board shall have authority to grant Awards and to adopt, amend and
         repeal such administrative rules, guidelines and practices relating to
         the Plan as it shall deem advisable. The Board may correct any defect,
         supply any omission or reconcile any inconsistency in the Plan or any
         Award in the manner and to the extent it shall deem expedient to carry
         the Plan into effect and it shall be the sole and final judge of such
         expediency. All decisions by the Board shall be made in the Board's
         sole discretion and shall be final and binding on all persons having or
         claiming any interest in the Plan or in any Award. No director or
         person acting pursuant to the authority delegated by the Board shall be
         liable for any action or determination relating to or under the Plan
         made in good faith.

                  (b) DELEGATION TO EXECUTIVE OFFICERS. To the extent permitted
         by applicable law, the Board may delegate to one or more executive
         officers of the Company the power to make Awards and exercise such
         other powers under the Plan as the Board may determine, provided that
         the Board shall fix the maximum number of shares subject to Awards and
         the maximum number of shares for any one Participant to be made by such
         executive officers.

                  (c) APPOINTMENT OF COMMITTEES. To the extent permitted by
         applicable law, the Board may delegate any or all of its powers under
         the Plan to one or more committees

<PAGE>   2

         or subcommittees of the Board (a "Committee"). If and when the common
         stock, $0.01 par value per share, of the Company (the "Common Stock")
         is registered under the Securities Exchange Act of 1934 (the "Exchange
         Act"), the Board shall appoint one such Committee of not less than two
         members, each member of which shall be an "outside director" within the
         meaning of Section 162(m) of the Code and a "non-employee director" as
         defined in Rule 16b-3 promulgated under the Exchange Act." All
         references in the Plan to the "Board" shall mean the Board or a
         Committee of the Board or the executive officer referred to in Section
         3(b) to the extent that the Board's powers or authority under the Plan
         have been delegated to such Committee or executive officer.

         4.       STOCK AVAILABLE FOR AWARDS

                  (a)      NUMBER OF SHARES. Subject to adjustment under Section
         4(b), Awards may be made under the Plan for up to 1,000,000 shares of
         Common Stock. If any Award expires or is terminated, surrendered or
         canceled without having been fully exercised or is forfeited in whole
         or in part or results in any Common Stock not being issued, the unused
         Common Stock covered by such Award shall again be available for the
         grant of Awards under the Plan, subject, however, in the case of
         Incentive Stock Options (as hereinafter defined), to any limitation
         required under the Code. Shares issued under the Plan may consist in
         whole or in part of authorized but unissued shares or treasury shares.

                  (b) PER-PARTICIPANT LIMIT. Subject to adjustment under Section
         4(c), for Awards granted after the Common Stock is registered under the
         Exchange Act, the maximum number of shares with respect to which an
         Award may be granted to any Participant under the plan shall be 500,000
         per calendar year. The per-participant limit described in this Section
         4(b) shall be construed and applied consistently with Section 162(m) of
         the Code.

                  (c) ADJUSTMENT TO COMMON STOCK. In the event of any stock
         split, stock dividend, recapitalization, reorganization, merger,
         consolidation, combination, exchange of shares, liquidation, spin-off
         or other similar change in capitalization or event, or any distribution
         to holders of Common Stock other than a normal cash dividend, (i) the
         number and class of securities available under this Plan, (ii) the
         number and class of security and exercise price per share subject to
         each outstanding Option, (iii) the repurchase price per security
         subject to each outstanding Restricted Stock Award, and (iv) the terms
         of each other outstanding stock-based Award shall be appropriately
         adjusted by the Company (or substituted Awards may be made, if
         applicable) to the extent the Board shall determine, in good faith,
         that such an adjustment (or substitution) is necessary and appropriate.
         If this Section 4(c) applies and Section 8(e)(1) also applies to any
         event, Section 8(e)(1) shall be applicable to such event, and this
         Section 4(c) shall not be applicable.

         5.       STOCK OPTIONS

                 (a)      GENERAL. The Board may grant options to purchase
         Common Stock (each, an "Option") and determine the number of shares of
         Common Stock to be covered by each Option, the exercise price of each
         Option and the conditions and limitations applicable to the exercise of
         each Option, including conditions relating to applicable federal or
         state securities laws, as it considers necessary or advisable. An
         Option which

<PAGE>   3

         is not intended to be an Incentive Stock Option (as hereinafter
         defined) shall be designated a "Nonstatutory Stock Option."

                  (b) INCENTIVE STOCK OPTIONS. An Option that the Board intends
         to be an "incentive stock option" as defined in Section 422 of the Code
         (an "Incentive Stock Option") shall only be granted to employees of the
         Company and shall be subject to and shall be construed consistently
         with the requirements of Section 422 of the Code. The Company shall
         have no liability to a Participant, or any other party, if an Option
         (or any part thereof) which is intended to be an Incentive Stock Option
         is not an Incentive Stock Option.

                  (c) EXERCISE PRICE. The Board shall establish the exercise
         price at the time each Option is granted and specify it in the
         applicable option agreement.

                  (d) DURATION OF OPTIONS. Each Option shall be exercisable at
         such times and subject to such terms and conditions as the Board may
         specify in the applicable option agreement.

                  (e) EXERCISE OF OPTION. Options may be exercised only by
         delivery to the Company of a written notice of exercise signed by the
         proper person together with payment in full as specified in Section
         5(f) for the number of shares for which the Option is exercised.

                  (f) PAYMENT UPON EXERCISE.  Common Stock purchased upon the
         exercise of an Option granted under the Plan shall be paid for as
         follows:

                           (1) in cash or by check, payable to the order of the
         Company;

                           (2) except as the Board may otherwise provide in an
         Option Agreement, delivery of an irrevocable and unconditional
         undertaking by a creditworthy broker to deliver promptly to the Company
         sufficient funds to pay the exercise price, or delivery by the
         Participant to the Company of a copy of irrevocable and unconditional
         instructions to a creditworthy broker to deliver promptly to the
         Company cash or a check sufficient to pay the exercise price;

                           (3) to the extent permitted by the Board and
         explicitly provided in an Option Agreement (i) by delivery of shares of
         Common Stock owned by the Participant valued at their fair market value
         as determined by the Board in good faith ("Fair Market Value"), which
         Common Stock was owned by the Participant at least six months prior to
         such delivery, (ii) by delivery of a promissory note of the Participant
         to the Company on terms determined by the Board, or (iii) by payment of
         such other lawful consideration as the Board may determine; or

                           (4) any combination of the above permitted forms of
         payment.

         6.       RESTRICTED STOCK

                  (a) GRANTS. The Board may grant Awards entitling recipients to
         acquire shares of Common Stock, subject to the right of the Company to
         repurchase all or part of such

<PAGE>   4

         shares at their issue price or other stated or formula price (or to
         require forfeiture of such shares if issued at no cost) from the
         recipient in the event that conditions specified by the Board in the
         applicable Award are not satisfied prior to the end of the applicable
         restriction period or periods established by the Board for such Award
         (each, "Restricted Stock Award").

                  (b) TERMS AND CONDITIONS. The Board shall determine the terms
         and conditions of any such Restricted Stock Award, including the
         conditions for repurchase (or forfeiture) and the issue price, if any.
         Any stock certificates issued in respect of a Restricted Stock Award
         shall be registered in the name of the Participant and, unless
         otherwise determined by the Board, deposited by the Participant,
         together with a stock power endorsed in blank, with the Company (or its
         designee). At the expiration of the applicable restriction periods, the
         Company (or such designee) shall deliver the certificates no longer
         subject to such restrictions to the Participant or if the Participant
         has died, to the beneficiary designated, in a manner determined by the
         Board, by a Participant to receive amounts due or exercise rights of
         the Participant in the event of the Participant's death (the
         "Designated Beneficiary"). In the absence of an effective designation
         by a Participant, Designated Beneficiary shall mean the Participant's
         estate.

         7.       OTHER STOCK-BASED AWARDS

                  The Board shall have the right to grant other Awards based
         upon the Common Stock having such terms and conditions as the Board may
         determine, including the grant of shares based upon certain conditions,
         the grant of securities convertible into Common Stock and the grant of
         stock appreciation rights.

         8.       GENERAL PROVISIONS APPLICABLE TO AWARDS

                  (a) TRANSFERABILITY OF AWARDS. Except as the Board may
         otherwise determine or provide in an Award, Awards shall not be sold,
         assigned, transferred, pledged or otherwise encumbered by the person to
         whom they are granted, either voluntarily or by operation of law,
         except by will or the laws of descent and distribution, and, during the
         life of the Participant, shall be exercisable only by the Participant.
         References to a Participant, to the extent relevant in the context,
         shall include references to authorized transferees.

                  (b) DOCUMENTATION. Each Award under the Plan shall be
         evidenced by a written instrument in such form as the Board shall
         determine. Each Award may contain terms and conditions in addition to
         those set forth in the Plan.

                  (c) BOARD DISCRETION. Except as otherwise provided by the
         Plan, each type of Award may be made alone or in addition or in
         relation to any other type of Award. The terms of each type of Award
         need not be identical, and the Board need not treat Participants
         uniformly.

                  (d) TERMINATION OF STATUS. The Board shall determine the
         effect on an Award of the disability, death, retirement, authorized
         leave of absence or other change in the employment or other status of a
         Participant and the extent to which, and the period during

<PAGE>   5

         which, the Participant, the Participant's legal representative,
         conservator, guardian or Designated Beneficiary may exercise rights
         under the Award.

                  (e) ACQUISITION EVENTS

                           (1)      CONSEQUENCES OF ACQUISITION EVENTS. Upon the
         occurrence of an Acquisition Event (as defined below), or the execution
         by the Company of any agreement with respect to an Acquisition Event,
         the Board shall take any one or more of the following actions with
         respect to then outstanding Awards: (i) provide that outstanding
         Options shall be assumed, or equivalent Options shall be substituted,
         by the acquiring or succeeding corporation (or an affiliate thereof),
         provided that any such Options substituted for Incentive Stock Options
         shall satisfy, in the determination of the Board, the requirements of
         Section 424(a) of the Code; (ii) upon written notice to the
         Participants, provide that all then unexercised Options will become
         exercisable in full as of a specified time (the "Acceleration Time")
         prior to the Acquisition Event and will terminate immediately prior to
         the consummation of such Acquisition Event, except to the extent
         exercised by the Participants between the Acceleration Time and the
         consummation of such Acquisition Event; (iii) in the event of an
         Acquisition Event under the terms of which holders of Common Stock will
         receive upon consummation thereof a cash payment for each share of
         Common Stock surrendered pursuant to such Acquisition Event (the
         "Acquisition Price"), provide that all outstanding Options shall
         terminate upon consummation of such Acquisition Event and each
         Participant shall receive, in exchange therefor, a cash payment equal
         to the amount (if any) by which (A) the Acquisition Price multiplied by
         the number of shares of Common Stock subject to such outstanding
         Options (whether or not then exercisable), exceeds (B) the aggregate
         exercise price of such Options; (iv) provide that all Restricted Stock
         Awards then outstanding shall become free of all restrictions prior to
         the consummation of the Acquisition Event; and (v) provide that any
         other stock-based Awards outstanding (A) shall become exercisable,
         realizable or vested in full, or shall be free of all conditions or
         restrictions, as applicable to each such Award, prior to the
         consummation of the Acquisition Event, or (B), if applicable, shall be
         assumed, or equivalent Awards shall be substituted, by the acquiring or
         succeeding corporation (or an affiliate thereof).

                  An "Acquisition Event" shall mean: (a) any merger or
         consolidation which results in the voting securities of the Company
         outstanding immediately prior thereto representing immediately
         thereafter (either by remaining outstanding or by being converted into
         voting securities of the surviving or acquiring entity) less than 50%
         of the combined voting power of the voting securities of the Company or
         such surviving or acquiring entity outstanding immediately after such
         merger or consolidation; (b) any sale of all or substantially all of
         the assets of the Company; or (c) the complete liquidation of the
         Company.

                           (2) ASSUMPTION OF OPTIONS UPON CERTAIN EVENTS. The
         Board may grant Awards under the Plan in substitution for stock and
         stock-based awards held by employees of another corporation who become
         employees of the Company as a result of a merger or consolidation of
         the employing corporation with the Company or the acquisition by the
         Company of property or stock of the employing corporation. The
         substitute Awards shall be granted on such terms and conditions as the
         Board considers appropriate in the circumstances.

<PAGE>   6

                  (f) WITHHOLDING. Each Participant shall pay to the Company, or
         make provision satisfactory to the Board for payment of, any taxes
         required by law to be withheld in connection with Awards to such
         Participant no later than the date of the event creating the tax
         liability. The Board may allow Participants to satisfy such tax
         obligations in whole or in part in shares of Common Stock, including
         shares retained from the Award creating the tax obligation, valued at
         their Fair Market Value. The Company may, to the extent permitted by
         law, deduct any such tax obligations from any payment of any kind
         otherwise due to a Participant.

                  (g) AMENDMENT OF AWARD. The Board may amend, modify or
         terminate any outstanding Award, including but not limited to,
         substituting therefor another Award of the same or a different type,
         changing the date of exercise or realization, and converting an
         Incentive Stock Option to a Nonstatutory Stock Option, provided that
         the Participant's consent to such action shall be required unless the
         Board determines that the action, taking into account any related
         action, would not materially and adversely affect the Participant.

                  (h) CONDITIONS ON DELIVERY OF STOCK. The Company will not be
         obligated to deliver any shares of Common Stock pursuant to the Plan or
         to remove restrictions from shares previously delivered under the Plan
         until (i) all conditions of the Award have been met or removed to the
         satisfaction of the Company, (ii) in the opinion of the Company's
         counsel, all other legal matters in connection with the issuance and
         delivery of such shares have been satisfied, including any applicable
         securities laws and any applicable stock exchange or stock market rules
         and regulations, and (iii) the Participant has executed and delivered
         to the Company such representations or agreements as the Company may
         consider appropriate to satisfy the requirements of any applicable
         laws, rules or regulations.

                  (i) ACCELERATION. The Board may at any time provide that any
         Options shall become immediately exercisable in full or in part, that
         any Restricted Stock Awards shall be free of all restrictions or that
         any other stock-based Awards may become exercisable in full or in part
         or free of some or all restrictions or conditions, or otherwise
         realizable in full or in part, as the case may be.

         9.       MISCELLANEOUS

                  (a) NO RIGHT TO EMPLOYMENT OR OTHER STATUS. No person shall
         have any claim or right to be granted an Award, and the grant of an
         Award shall not be construed as giving a Participant the right to
         continued employment or any other relationship with the Company. The
         Company expressly reserves the right at any time to dismiss or
         otherwise terminate its relationship with a Participant free from any
         liability or claim under the Plan, except as expressly provided in the
         applicable Award.

                  (b) NO RIGHTS AS STOCKHOLDER. Subject to the provisions of the
         applicable Award, no Participant or Designated Beneficiary shall have
         any rights as a stockholder with respect to any shares of Common Stock
         to be distributed with respect to an Award until becoming the record
         holder of such shares.

<PAGE>   7

                  (c) EFFECTIVE DATE AND TERM OF PLAN. The Plan shall become
         effective on the date on which it is adopted by the Board, but no Award
         granted to a Participant designated as subject to Section 162(m) by the
         Board shall become exercisable, vested or realizable, as applicable to
         such Award, unless and until the Plan has been approved by the
         Company's stockholders. No Awards shall be granted under the Plan after
         the completion of ten years from the earlier of (i) the date on which
         the Plan was adopted by the Board or (ii) the date the Plan was
         approved by the Company's stockholders, but Awards previously granted
         may extend beyond that date.

                  (d) AMENDMENT OF PLAN. The Board may amend, suspend or
         terminate the Plan or any portion thereof at any time, provided that no
         Award granted to a Participant designated as subject to Section 162(m)
         by the Board after the date of such amendment shall become exercisable,
         realizable or vested, as applicable to such Award (to the extent that
         such amendment to the Plan was required to grant such Award to a
         particular Participant), unless and until such amendment shall have
         been approved by the Company's stockholders.

                  (e) STOCKHOLDER APPROVAL. For purposes of this Plan,
         stockholder approval shall mean approval by a vote of the stockholders
         in accordance with the requirements of Section 162(m) of the Code.

                  (f) GOVERNING LAW. The provisions of the Plan and all Awards
         made hereunder shall be governed by and interpreted in accordance with
         the laws of the State of Delaware, without regard to any applicable
         conflicts of law.

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