EXHIBIT 4.3

                                 SUMMIT DESIGN, INC.

                          1996 EMPLOYEE STOCK PURCHASE PLAN


       The following constitute the provisions of the 1996 Employee Stock
Purchase Plan of Summit Design, Inc.

       1.      PURPOSE.  The purpose of the Plan is to provide employees of the
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company through accumulated payroll deductions.  It is the
intention of the Company to have the Plan qualify as an "Employee Stock Purchase
Plan" under Section 423 of the Internal Revenue Code of 1986, as amended.  The
provisions of the Plan, accordingly, shall be construed so as to extend and
limit participation in a manner consistent with the requirements of that section
of the Code.

       2.      DEFINITIONS.

               (a)    "BOARD" shall mean the Board of Directors of the Company.

               (b)    "CODE" shall mean the Internal Revenue Code of 1986, as
amended.

               (c)    "COMMON STOCK" shall mean the Common Stock of the
Company.

               (d)    "COMPANY" shall mean Summit Design, Inc. and any
Designated Subsidiary of the Company.

               (e)    "COMPENSATION" shall mean all base straight time gross
earnings and commissions, but exclusive of payments for overtime, shift premium,
incentive compensation, incentive payments, bonuses and other compensation.

               (f)    "DESIGNATED SUBSIDIARIES" shall mean the Subsidiaries
which have been designated by the Board from time to time in its sole discretion
as eligible to participate in the Plan.

               (g)    "EMPLOYEE" shall mean any individual who is an Employee
of the Company for tax purposes whose customary employment with the Company is
at least twenty (20) hours per week and more than five (5) months in any
calendar year.  For purposes of the Plan, the employment relationship shall be
treated as continuing intact while the individual is on sick leave or other
leave of absence approved by the Company.  Where the period of leave exceeds 90
days and the individual's right to reemployment is not guaranteed either by
statute or by contract, the employment relationship shall be deemed to have
terminated on the 91st day of such leave.

               (h)    "ENROLLMENT DATE" shall mean the first day of each
Offering Period.

               (i)    "EXERCISE DATE" shall mean the last day of each Purchase
Period.


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               (j)    "FAIR MARKET VALUE" shall mean, as of any date, the value
of Common Stock determined as follows:

                      (1)     If the Common Stock is listed on any established
stock exchange or a national market system, including without limitation the
Nasdaq National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market,
its Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
THE WALL STREET JOURNAL or such other source as the Administrator deems
reliable, or;

                      (2)     If the Common Stock is regularly quoted by a
recognized securities dealer but selling prices are not reported, its Fair
Market Value shall be the mean of the closing bid and asked prices for the
Common Stock on the date of such determination, as reported in THE WALL STREET
JOURNAL or such other source as the Board deems reliable, or;

                      (3)     For the purposes of the Enrollment Date under the
first Offering Period under the Plan, the Fair Market Value of the Common Stock
shall be the price to public as set forth in the final prospectus included
within the Registration Statement on Form S-1 filed with the Securities and
Exchange Commission for the initial public offering of the Common Stock.

                      (4)     In the absence of an established market for the
Common Stock, the Fair Market Value thereof shall be determined in good faith by
the Board.

               (k)    "OFFERING PERIODS" shall mean the periods of
approximately twenty-four (24) months during which an option granted pursuant to
the Plan may be exercised, commencing on the first Trading Day on or after May 1
and November 1 of each year and terminating on the last Trading Day in the
periods ending twenty-four months later.  The first Offering Period shall be the
period commencing with the first Trading Day on or after the date on which the
Company's registration statement on Form S-1 is declared effective by the
Securities and Exchange Commission and terminating on the last Trading Day on or
before October 31, 1998. The duration and timing of Offering Periods may be
changed pursuant to Section 4 of this Plan.

               (l)    "PLAN" shall mean this Employee Stock Purchase Plan.

               (m)    "PURCHASE PRICE" shall mean an amount equal to 85% of the
Fair Market Value of a share of Common Stock on the Enrollment Date or on the
Exercise Date, whichever is lower.

               (n)    "PURCHASE PERIOD" shall mean the approximately six month
period commencing after one Exercise Date and ending with the next Exercise
Date, except that the first Purchase Period of any Offering Period shall
commence on the Enrollment Date and end with the next Exercise Date.


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               (o)    "RESERVES" shall mean the number of shares of Common
Stock covered by each option under the Plan which have not yet been exercised
and the number of shares of Common Stock which have been authorized for issuance
under the Plan but not yet placed under option.

               (p)    "SUBSIDIARY" shall mean a corporation, domestic or
foreign, of which not less than 50% of the voting shares are held by the Company
or a Subsidiary, whether or not such corporation now exists or is hereafter
organized or acquired by the Company or a Subsidiary.

               (q)    "TRADING DAY" shall mean a day on which national stock
exchanges and the Nasdaq System are open for trading.

       3.      ELIGIBILITY.

               (a)    Any Employee (as defined in Section 2(g)), who shall be
employed by the Company on a given Enrollment Date shall be eligible to
participate in the Plan.

               (b)    Any provisions of the Plan to the contrary
notwithstanding, no Employee shall be granted an option under the Plan (i) to
the extent that, immediately after the grant, such Employee (or any other person
whose stock would be attributed to such Employee pursuant to Section 424(d) of
the Code) would own capital stock of the Company and/or hold outstanding options
to purchase such stock possessing five percent (5%) or more of the total
combined voting power or value of all classes of the capital stock of the
Company or of any Subsidiary, or (ii) to the extent that his or her rights to
purchase stock under all employee stock purchase plans of the Company and its
subsidiaries accrues at a rate which exceeds Twenty-Five Thousand Dollars
($25,000) worth of stock (determined at the fair market value of the shares at
the time such option is granted) for each calendar year in which such option is
outstanding at any time.

       4.      OFFERING PERIODS.  The Plan shall be implemented by consecutive,
overlapping Offering Periods with a new Offering Period commencing on the first
Trading Day on or after May 1 and November 1 each year, or on such other date as
the Board shall determine, and continuing thereafter until terminated in
accordance with Section 19 hereof.  The first Offering Period shall begin on the
effective date of the initial public offering of the Company's Common Stock that
is filed with the Securities and Exchange Commission and shall end on the last
Trading Day on or before October 31, 1998. The Board shall have the power to
change the duration of Offering Periods (including the commencement dates
thereof) with respect to future offerings without stockholder approval if such
change is announced at least five (5) days prior to the scheduled beginning of
the first Offering Period to be affected thereafter.

       5.      PARTICIPATION.


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               (a)    An eligible Employee may become a participant in the Plan
by completing a subscription agreement authorizing payroll deductions in the
form of Exhibit A to this Plan and filing it with the Company's payroll office
prior to the applicable Enrollment Date.

               (b)    Payroll deductions for a participant shall commence on
the first payroll following the Enrollment Date and shall end on the last
payroll in the Offering Period to which such authorization is applicable, unless
sooner terminated by the participant as provided in Section 10 hereof.

       6.      PAYROLL DEDUCTIONS.

               (a)    At the time a participant files his or her subscription
agreement, he or she shall elect to have payroll deductions made on each pay day
during the Offering Period in an amount not exceeding ten percent (10%) of the
Compensation which he or she receives on each pay day during the Offering
Period.

               (b)    All payroll deductions made for a participant shall be
credited to his or her account under the Plan and shall be withheld in whole
percentages only.  A participant may not make any additional payments into such
account.

               (c)    A participant may discontinue his or her participation in
the Plan as provided in Section 10 hereof, or may increase or decrease the rate
of his or her payroll deductions during the Offering Period by completing or
filing with the Company a new subscription agreement authorizing a change in
payroll deduction rate.  The Board may, in its discretion, limit the number of
participation rate changes during any Offering Period.  The change in rate shall
be effective with the first full payroll period following five (5) business days
after the Company's receipt of the new subscription agreement unless the Company
elects to process a given change in participation more quickly.  A participant's
subscription agreement shall remain in effect for successive Offering Periods
unless terminated as provided in Section 10 hereof.

               (d)    Notwithstanding the foregoing, to the extent necessary to
comply with Section 423(b)(8) of the Code and Section 3(b) hereof, a
participant's payroll deductions may be decreased to zero percent (0%) at such
time during any Purchase Period which is scheduled to end during the current
calendar year (the "Current Purchase Period") that the aggregate of all payroll
deductions which were previously used to purchase stock under the Plan in a
prior Purchase Period which ended during that calendar year plus all payroll
deductions accumulated with respect to the Current Purchase Period equal
$21,250.  Payroll deductions shall recommence at the rate provided in such
participant's subscription agreement at the beginning of the first Purchase
Period which is scheduled to end in the following calendar year, unless
terminated by the participant as provided in Section 10 hereof.


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               (e)    At the time the option is exercised, in whole or in part,
or at the time some or all of the Company's Common Stock issued under the Plan
is disposed of, the participant must make adequate provision for the Company's
federal, state, or other tax withholding obligations, if any, which arise upon
the exercise of the option or the disposition of the Common Stock.  At any time,
the Company may, but shall not be obligated to, withhold from the participant's
compensation the amount necessary for the Company to meet applicable withholding
obligations, including any withholding required to make available to the Company
any tax deductions or benefits attributable to sale or early disposition of
Common Stock by the Employee.

       7.      GRANT OF OPTION.  On the Enrollment Date of each Offering Period,
each eligible Employee participating in such Offering Period shall be granted an
option to purchase on each Exercise Date during such Offering Period (at the
applicable Purchase Price) up to a number of shares of the Company's Common
Stock determined by dividing such Employee's payroll deductions accumulated
prior to such Exercise Date and retained in the Participant's account as of the
Exercise Date by the applicable Purchase Price; provided that in no event shall
an Employee be permitted to purchase during each Purchase Period more than a
number of shares determined by dividing $12,500 by the Fair Market Value of a
share of the Company's Common Stock on the Enrollment Date, and provided further
that such purchase shall be subject to the limitations set forth in
Sections 3(b) and 12 hereof. Exercise of the option shall occur as provided in
Section 8 hereof, unless the participant has withdrawn pursuant to Section 10
hereof.  The option shall expire on the last day of the Offering Period.

       8.      EXERCISE OF OPTION.  Unless a participant withdraws from the Plan
as provided in Section 10 hereof, his or her option for the purchase of shares
shall be exercised automatically on the Exercise Date, and the maximum number of
full shares subject to option shall be purchased for such participant at the
applicable Purchase Price with the accumulated payroll deductions in his or her
account.  No fractional shares shall be purchased; any payroll deductions
accumulated in a participant's account which are not sufficient to purchase a
full share shall be retained in the participant's account for the subsequent
Purchase Period or Offering Period, subject to earlier withdrawal by the
participant as provided in Section 10 hereof.  Any other monies left over in a
participant's account after the Exercise Date shall be returned to the
participant.  During a participant's lifetime, a participant's option to
purchase shares hereunder is exercisable only by him or her.

       9.      DELIVERY.  As promptly as practicable after each Exercise Date on
which a purchase of shares occurs, the Company shall arrange the delivery to
each participant, as appropriate, of a certificate representing the shares
purchased upon exercise of his or her option.

       10.     WITHDRAWAL; TERMINATION OF EMPLOYMENT.

               (a)    A participant may withdraw all but not less than all the
payroll deductions credited to his or her account and not yet used to exercise
his or her option under the Plan at any


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time by giving written notice to the Company in the form of Exhibit B to this
Plan.  All of the participant's payroll deductions credited to his or her
account shall be paid to such participant promptly after receipt of notice of
withdrawal and such participant's option for the Offering Period shall be
automatically terminated, and no further payroll deductions for the purchase of
shares shall be made for such Offering Period.  If a participant withdraws from
an Offering Period, payroll deductions shall not resume at the beginning of the
succeeding Offering Period unless the participant delivers to the Company a new
subscription agreement.

               (b)    Upon a participant's ceasing to be an Employee (as
defined in Section 2(g) hereof), for any reason, he or she shall be deemed to
have elected to withdraw from the Plan and the payroll deductions credited to
such participant's account during the Offering Period but not yet used to
exercise the option shall be returned to such participant or, in the case of his
or her death, to the person or persons entitled thereto under Section 14 hereof,
and such participant's option shall be automatically terminated.  The preceding
sentence notwithstanding, a participant who receives payment in lieu of notice
of termination of employment shall be treated as continuing to be an Employee
for the participant's customary number of hours per week of employment during
the period in which the participant is subject to such payment in lieu of
notice.

               (c)    A participant's withdrawal from an Offering Period shall
not have any effect upon his or her eligibility to participate in any similar
plan which may hereafter be adopted by the Company or in succeeding Offering
Periods which commence after the termination of the Offering Period from which
the participant withdraws.

       11.     INTEREST.  No interest shall accrue on the payroll deductions of
a participant in the Plan.

       12.     STOCK.

               (a)    The maximum number of shares of the Company's Common
Stock which shall be made available for sale under the Plan shall be 535,000
shares, subject to adjustment upon changes in capitalization of the Company as
provided in Section 18 hereof.  If, on a given Exercise Date, the number of
shares with respect to which options are to be exercised exceeds the number of
shares then available under the Plan, the Company shall make a pro rata
allocation of the shares remaining available for purchase in as uniform a manner
as shall be practicable and as it shall determine to be equitable.

               (b)    The participant shall have no interest or voting right in
shares covered by his option until such option has been exercised.

               (c)    Shares to be delivered to a participant under the Plan
shall be registered in the name of the participant or in the name of the
participant and his or her spouse.


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       13.     ADMINISTRATION.

               (a)  ADMINISTRATIVE BODY.  The Plan shall be administered by the
Board or a committee of members of the Board appointed by the Board.  The Board
or its committee shall have full and exclusive discretionary authority to
construe, interpret and apply the terms of the Plan, to determine eligibility
and to adjudicate all disputed claims filed under the Plan.  Every finding,
decision and determination made by the Board or its committee shall, to the full
extent permitted by law, be final and binding upon all parties.

               (b)    RULE 16b-3 LIMITATIONS.  Notwithstanding the provisions
of Subsection (a) of this Section 13, in the event that Rule 16b-3 promulgated
under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or
any successor provision ("Rule 16b-3") provides specific requirements for the
administrators of plans of this type, the Plan shall be administered only by
such a body and in such a manner as shall comply with the applicable
requirements of Rule 16b-3.  Unless permitted by Rule 16b-3, no discretion
concerning decisions regarding the Plan shall be afforded to any committee or
person that is not "disinterested" as that term is used in Rule 16b-3.

       14.     DESIGNATION OF BENEFICIARY.

               (a)    A participant may file a written designation of a
beneficiary who is to receive any shares and cash, if any, from the
participant's account under the Plan in the event of such participant's death
subsequent to an Exercise Date on which the option is exercised but prior to
delivery to such participant of such shares and cash.  In addition, a
participant may file a written designation of a beneficiary who is to receive
any cash from the participant's account under the Plan in the event of such
participant's death prior to exercise of the option.  If a participant is
married and the designated beneficiary is not the spouse, spousal consent shall
be required for such designation to be effective.

               (b)    Such designation of beneficiary may be changed by the
participant at any time by written notice.  In the event of the death of a
participant and in the absence of a beneficiary validly designated under the
Plan who is living at the time of such participant's death, the Company shall
deliver such shares and/or cash to the executor or administrator of the estate
of the participant, or if no such executor or administrator has been appointed
(to the knowledge of the Company), the Company, in its discretion, may deliver
such shares and/or cash to the spouse or to any one or more dependents or
relatives of the participant, or if no spouse, dependent or relative is known to
the Company, then to such other person as the Company may designate.

       15.     TRANSFERABILITY.  Neither payroll deductions credited to a
participant's account nor any rights with regard to the exercise of an option or
to receive shares under the Plan may be assigned, transferred, pledged or
otherwise disposed of in any way (other than by will, the laws of descent and
distribution or as provided in Section 14 hereof) by the participant.  Any such
attempt


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at assignment, transfer, pledge or other disposition shall be without effect,
except that the Company may treat such act as an election to withdraw funds from
an Offering Period in accordance with Section 10 hereof.

       16.     USE OF FUNDS.  All payroll deductions received or held by the
Company under the Plan may be used by the Company for any corporate purpose, and
the Company shall not be obligated to segregate such payroll deductions.

       17.     REPORTS.  Individual accounts shall be maintained for each
participant in the Plan.  Statements of account shall be given to participating
Employees at least annually, which statements shall set forth the amounts of
payroll deductions, the Purchase Price, the number of shares purchased and the
remaining cash balance, if any.

       18.     ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, DISSOLUTION,
               LIQUIDATION, MERGER OR ASSET SALE.

               (a)    CHANGES IN CAPITALIZATION.  Subject to any required
action by the stockholders of the Company, the Reserves, as well as the price
per share and the number of shares of Common Stock covered by each option under
the Plan which has not yet been exercised, shall be proportionately adjusted for
any increase or decrease in the number of issued shares of Common Stock
resulting from a stock split, reverse stock split, stock dividend, combination
or reclassification of the Common Stock, or any other increase or decrease in
the number of shares of Common Stock effected without receipt of consideration
by the Company; provided, however, that conversion of any convertible securities
of the Company shall not be deemed to have been "effected without receipt of
consideration".  Such adjustment shall be made by the Board, whose determination
in that respect shall be final, binding and conclusive.  Except as expressly
provided herein, no issuance by the Company of shares of stock of any class, or
securities convertible into shares of stock of any class, shall affect, and no
adjustment by reason thereof shall be made with respect to, the number or price
of shares of Common Stock subject to an option.

               (b)    DISSOLUTION OR LIQUIDATION.  In the event of the proposed
dissolution or liquidation of the Company, the Offering Periods shall terminate
immediately prior to the consummation of such proposed action, unless otherwise
provided by the Board.

               (c)    MERGER OR ASSET SALE.  In the event of a proposed sale of
all or substantially all of the assets of the Company, or the merger of the
Company with or into another corporation, any Purchase Periods then in progress
shall be shortened by setting a new Exercise Date (the "New Exercise Date") and
any Offering Periods then in progress shall end on the New Exercise Date.  The
New Exercise Date shall be before the date of the Company's proposed sale or
merger.  The Board shall notify each participant in writing, at least ten (10)
business days prior to the New Exercise Date, that the Exercise Date for the
participant's option has been changed to the New Exercise Date and that the
participant's option shall be exercised automatically on the New


                                         8


Exercise Date, unless prior to such date the participant has withdrawn from the
Offering Period as provided in Section 10 hereof.

       19.     AMENDMENT OR TERMINATION.

               (a)    The Board of Directors of the Company may at any time and
for any reason terminate or amend the Plan.  Except as provided in Section 18
hereof, no such termination can affect options previously granted, provided that
an Offering Period may be terminated by the Board of Directors on any Exercise
Date if the Board determines that the termination of the Plan is in the best
interests of the Company and its stockholders.  Except as provided in Section 18
hereof, no amendment may make any change in any option theretofore granted which
adversely affects the rights of any participant.  To the extent necessary to
comply with Rule 16b-3 or under Section 423 of the Code (or any successor rule
or provision or any other applicable law or regulation), the Company shall
obtain stockholder approval in such a manner and to such a degree as required.

               (b)    Without stockholder consent and without regard to whether
any participant rights may be considered to have been "adversely affected," the
Board (or its committee) shall be entitled to change the Offering Periods, limit
the frequency and/or number of changes in the amount withheld during an Offering
Period, establish the exchange ratio applicable to amounts withheld in a
currency other than U.S. dollars, permit payroll withholding in excess of the
amount designated by a participant in order to adjust for delays or mistakes in
the Company's processing of properly completed withholding elections, establish
reasonable waiting and adjustment periods and/or accounting and crediting
procedures to ensure that amounts applied toward the purchase of Common Stock
for each participant properly correspond with amounts withheld from the
participant's Compensation, and establish such other limitations or procedures
as the Board (or its committee) determines in its sole discretion advisable
which are consistent with the Plan.

       20.     NOTICES.  All notices or other communications by a participant to
the Company under or in connection with the Plan shall be deemed to have been
duly given when received in the form specified by the Company at the location,
or by the person, designated by the Company for the receipt thereof.

       21.     CONDITIONS UPON ISSUANCE OF SHARES.  Shares shall not be issued
with respect to an option unless the exercise of such option and the issuance
and delivery of such shares pursuant thereto shall comply with all applicable
provisions of law, domestic or foreign, including, without limitation, the
Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange upon which the shares may then be listed, and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.


                                         9


               As a condition to the exercise of an option, the Company may
require the person exercising such option to represent and warrant at the time
of any such exercise that the shares are being purchased only for investment and
without any present intention to sell or distribute such shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned applicable provisions of law.

       22.     TERM OF PLAN.  The Plan shall become effective upon the earlier
to occur of its adoption by the Board of Directors or its approval by the
stockholders of the Company.  It shall continue in effect for a term of ten (10)
years unless sooner terminated under Section 19 hereof.

       23.     AUTOMATIC TRANSFER TO LOW PRICE OFFERING PERIOD.  To the extent
permitted by Rule 16b-3 of the Exchange Act, if the Fair Market Value of the
Common Stock on any Exercise Date in an Offering Period is lower than the Fair
Market Value of the Common Stock on the Enrollment Date of such Offering Period,
then all participants in such Offering Period shall be automatically withdrawn
from such Offering Period immediately after the exercise of their option on such
Exercise Date and automatically re-enrolled in the immediately following
Offering Period as of the first day thereof.


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                              EXHIBIT A


                         SUMMIT DESIGN, INC.

                  1996 EMPLOYEE STOCK PURCHASE PLAN

                       SUBSCRIPTION AGREEMENT



_______ Original Application                      Enrollment Date: _____________
_______ Change in Payroll Deduction Rate
_______ Change of Beneficiary(ies)


1.   ________________________________ hereby elects to participate in the
     Summit Design, Inc. 1996 Employee Stock Purchase Plan (the "Employee
     Stock Purchase Plan") and subscribes to purchase shares of the Company's
     Common Stock in accordance with this Subscription Agreement and the
     Employee Stock Purchase Plan.

2.   I hereby authorize payroll deductions from each paycheck in the amount
     of ____% of my Compensation on each payday (from 1 to 10%) during the
     Offering Period in accordance with the Employee Stock Purchase Plan.
     (Please note that no fractional percentages are permitted.)

3.   I understand that said payroll deductions shall be accumulated for the
     purchase of shares of Common Stock at the applicable Purchase Price
     determined in accordance with the Employee Stock Purchase Plan.  I
     understand that if I do not withdraw from an Offering Period, any
     accumulated payroll deductions will be used to automatically exercise my
     option.

4.   I have received a copy of the complete Employee Stock Purchase Plan.  I
     understand that my participation in the Employee Stock Purchase Plan is
     in all respects subject to the terms of the Plan.  I understand that my
     ability to exercise the option under this Subscription Agreement is
     subject to stockholder approval of the Employee Stock Purchase Plan.

5.   Shares purchased for me under the Employee Stock Purchase Plan should be
     issued in the name(s) of (Employee or Employee and Spouse only):  ______
     __________________________________________________.

6.   I understand that if I dispose of any shares received by me pursuant to
     the Plan within 2 years after the Enrollment Date (the first day of the
     Offering Period during which I purchased such shares) or one year after
     the Exercise Date, I will be treated for federal income tax purposes as
     having received ordinary income at the time of such disposition in


                                       11


     an amount equal to the excess of the fair market value of the shares at
     the time such shares were purchased by me over the price which I paid
     for the shares.  I HEREBY AGREE TO NOTIFY THE COMPANY IN WRITING WITHIN
     30 DAYS AFTER THE DATE OF ANY DISPOSITION OF MY SHARES AND I WILL MAKE
     ADEQUATE PROVISION FOR FEDERAL, STATE OR OTHER TAX WITHHOLDING
     OBLIGATIONS, IF ANY, WHICH ARISE UPON THE DISPOSITION OF THE COMMON
     STOCK.  The Company may, but will not be obligated to, withhold from my
     compensation the amount necessary to meet any applicable withholding
     obligation including any withholding necessary to make available to the
     Company any tax deductions or benefits attributable to sale or early
     disposition of Common Stock by me. If I dispose of such shares at any
     time after the expiration of the 2-year and 1-year holding periods, I
     understand that I will be treated for federal income tax purposes as
     having received income only at the time of such disposition, and that
     such income will be taxed as ordinary income only to the extent of an
     amount equal to the lesser of (1) the excess of the fair market value of
     the shares at the time of such disposition over the purchase price which
     I paid for the shares, or (2) 15% of the fair market value of the shares
     on the first day of the Offering Period.  The remainder of the gain, if
     any, recognized on such disposition will be taxed as capital gain.

7.   I hereby agree to be bound by the terms of the Employee Stock Purchase
     Plan.  The effectiveness of this Subscription Agreement is dependent
     upon my eligibility to participate in the Employee Stock Purchase Plan.

8.   In the event of my death, I hereby designate the following as my
     beneficiary(ies) to receive all payments and shares due me under the
     Employee Stock Purchase Plan:


NAME:  (Please print)
                     -----------------------------------------------------------
                    (First)         (Middle)               (Last)


- -------------------------------    ------------------------------------------
Relationship

                         ------------------------------------------
                         (Address)


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Employee's Social
Security Number:                        ----------------------------------------



Employee's Address:                     ----------------------------------------

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

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


I UNDERSTAND THAT THIS SUBSCRIPTION AGREEMENT SHALL REMAIN IN EFFECT THROUGHOUT
SUCCESSIVE OFFERING PERIODS UNLESS TERMINATED BY ME.



Dated:
      -------------------------         ----------------------------------------
                                        Signature of Employee


                                        ----------------------------------------
                                        Spouse's Signature (If beneficiary other
                                        than spouse)


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                              EXHIBIT B


                         SUMMIT DESIGN, INC.

                  1996 EMPLOYEE STOCK PURCHASE PLAN

                        NOTICE OF WITHDRAWAL



     The undersigned participant in the Offering Period of the Summit Design,
Inc. 1996 Employee Stock Purchase Plan which began on ____________, 19____ (the
"Enrollment Date") hereby notifies the Company that he or she hereby withdraws
from the Offering Period.  He or she hereby directs the Company to pay to the
undersigned as promptly as practicable all the payroll deductions credited to
his or her account with respect to such Offering Period. The undersigned
understands and agrees that his or her option for such Offering Period will be
automatically terminated.  The undersigned understands further that no further
payroll deductions will be made for the purchase of shares in the current
Offering Period and the undersigned shall be eligible to participate in
succeeding Offering Periods only by delivering to the Company a new Subscription
Agreement.

                                        Name and Address of Participant:

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

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

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


                                        Signature:


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


                                        Date:
                                             ------------------------------


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