Document:

WELBORN II
                             FAMILY TRUST AGREEMENT

         This TRUST AGREEMENT,  made and executed at Fort Worth, Tarrant County,
State of  Texas,  this 5th day of  February,  1993,  by and  between  RONALD  W.
WELBORN,  hereinafter  referred to as  "Settlor",  and REGINALD L. DAVIS,  ESQ.,
hereinafter  referred to as  "Trustee",  of this Trust known as tile "WELBORN II
FAMILY TRUST":

                                   WITNESSETH

         Settlor  has  conveyed,  transferred,  and  assigned  and does by these
presents  convey,  transfer,  and  assign  unto  the  Trustee  the  assets,  and
properties  described  in  Schedule  A attached  hereto and made a part  hereof.
Settlor or a.ny other person or persons may by instrument  in writing,  by will,
or by training the Trustee as beneficiary of life insurance or employee  benefit
plan  proceeds,  deliver  to the  Trustee  at any  time,  and from time to time,
additional  assets and properties  acceptable to the Trustee,  which  additional
assets and properties shall be held,  administered,  and distributed pursuant to
this Agreement.

                                   ARTICLE ONE

         This  Trust  shall  be  irrevocable  and may not be  altered,  amended,
revoked, terminated by the Settlor at any time.

                                   ARTICLE TWO

                            Distributions to Settlor

         So long as Settlor shall live there shall be  distributed to or for the
benefit of Settlor,  SUSAN R. WELBORN,  CAMILLE  WELBORN,  NINA WELBORN,  RONALD
REEVES WELBORN,  and VICTORIA CHANNING  WELBORN,  all of the Trust income and so
much of the principal as is needed for the health, maintenance,  anid support of
the  beneficiaries.  The  Trustee  shall have sole and  absolute  discretion  to
determine amounts, beneficiaries,  and timing as to distributions, and may favor
one or more  beneficiaries  over the others  without  equalization  or proration
among beneficiaries.

                                       12

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         The Trustee may suspend or withhold payments to any beneficiary for any
reason, without accountability to any person or entity, and no beneficiary shall
have any  vested  right  through  this  Trust to any of the Trust  assets or the
income therefrom.

                                  ARTICLE THREE

                              Termination of Trust

         This Trust  shall  terminate  upon the death of  Settlor  and the Trust
property shall pass outright to SUSAN R. WELBORN, CAMILLE WELBORN, NINA WELBORN,
RONALD REEVES  WELBORN,  and VICTORIA  CHANNING  WELBORN,  in equal shares,  per
stirpes.  If any beneficiary is under the age of twenty-five  (25) years,  their
share of the Trust  proceeds shall be held in trust for their benefit until such
beneficiary  shall attain the age of twenty-five  (25) years.  Such trust may be
combined with any other trust or trusts in existence and for their benefit as of
the date of Settlor's death..

                                  ARTICLE FOUR

                                   Spendthrift

         The   beneficiaries,   shall   not   have   the   right   or  power  to
anticiptate[ate,  encumber,  or transfer his or her  interest in any manner.  No
part of the  Trust  Estate  shall be  liable  for or  charged  with  any  debts,
contracts,  liabilities,  or torts of the beneficiaries or subject to seizure or
other process by any creditor of the beneficiaries.

         The interest of  beneficiaries  in the  principal  and/or income of any
trust created hereunder shall not be subject to the claims of their creditors or
creditors  of  others,  including  the  creditors  of the  spouse  of a  married
beneficiary,   nor  to  any  legal  process,  and  may  not  be  voluntarily  or
involuntarily alienated or encumbered,

                                        13

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                                  ARTICLE FIVE

                                POWERS OF TRUSTEE

                              Description of Powers

         In  order  to carry  out the  purposes  of this  Trust  Agreement,  the
Trustee,  in  addition  to all  other  powers  granted  by Law,  shall  have the
following powers and discretion:

                               Retention of Assets

         (a) To retain :any property received by the Trust Estate for as long as
the Trustee considers it advisable.

                                   Investments

         (b) To invest and  reinvest  in every kind of property  and  investment
wliich men of  pnideiice,  discretion,  and  intelligence  acquire for their own
accounts.

                                   Management

         (c)      To manage, control, repair, and improve all Trust property.

                                      Sales

         (d) To  sell,  for  cash or on such  terms  and  conditions  as  deemed
advisable or desirable by the Trustee, and to exchange any Trust property.

                              Adjustment of Claims

         (e) To adjust or Compromise any claims for or against the Trust, and to
agree to any rescission or modification of any contract or agreement.

                                       14

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                               Leases of Property

         (f) To lease any property  for terms within or beyond tile  duration of
the  Trust  for any  purpose  which  the  Trustee  in his  discretion  may  deem
advisable,  with or without an option to purchase, and to make such improvements
or effect such repairs or  replacements to any real estate subject to this Trust
Agreement,  find to insure such real estate against fire or any other risks, and
to charge the expense  therefor to the  principal  or income or part  thereof to
each as the Trustee may deem proper, and to develop such property,  to subdivide
it,  dedicate it to public use,  or grant  easements  therein as the Trustee may
consider  advisable and to execute leases or other  instruments  relating to the
exploration  and removal of oil, gas,  liquid or gaseous  hydrocarbons,  Sulfur,
metals, and any and all other metals,  minerals,  or natural resources,  with or
without unitization clauses or pooling provisions, in such a manner and for such
terms as the Trustee may deem  advisable,  and any lease or agreement  made with
respect  thereto  shall be binding for the full term  thereof even though it may
extend beyond the duration of the Trust.

                                    Borrowing

         (g) To borrow money and to mortgage or pledge or otherwise  encumber or
hypothecate  Trust assets as the Trustee may in his discretion  deem  advisable,
either from himself individually, or from third parties.

                            Division and Distribution

         (h)  On  any  division  or  distribution  of the  Trust  Estate  in the
discretion of the Trustee, to divide and distribute property of the trust Estate
in money or in kind, including undivided interests, or partly in money or partly
in kind, including undivided interests, to exercise such powers herein conferred
after the termination of the Trust Estate until final  distribution of the Trust
assets; and to evaluate trust property for purposes of determining the amount of
the Trust principal to be distributed to the beneficiaries  named herein,  which
evaluation,  in the absence of a showing of bad faith,  shall be conclusive  and
binding.

                                       15

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                             Professional Assistance

         To  retain  and  compensate  such  professional  personnel,  attorneys,
accountants,  physicians,  geologists,  and the like as necessary to provide for
the beneficiaries and to protect and manage the Trust Estate.

                              Limitation on Powers

         All  powers  granted  to  the  Trustee  by  this  Trust  Agreement  are
exercisable by the Trustee only in a fiduciary  capacity.  No power given to the
Trustee  hereunder  shall be construed  to enable the Settlor,  or any person to
purchase, exchange, or otherwise deal with or dispose of the principal or income
therefrom for less than an adequate  consideration in money or money's worth; to
permit the  Settlor or any other  contributor  to the Trust to borrow  income or
principal; or to authorize loans to a person other than the Settlor or any other
contributor to the Trust, except on the basis of an adequate interest charge and
with  adequate  security.  No  person,  other  than the  Trustee,  shall have or
exercise the power to vote or direct the voting of any corporate shares or other
securities  of this Trust,  to control the  investment  of this Trust  either by
directing  investments or reinvestments  or by vetoing  proposed  investments or
reinvestments,  or to  reacquire  or  exchange  any  property  of this  trust by
substituting other prperty of equivivalent value.

                                   ARTICLE SIX

                       DUTIES AND COMPENSATION OF TRUSTEE

                       Allocation of Income and Principal

         The Trustee shall determine what is income and what is principal of the
Trust created under this Trust Agreement,  and what expenses,  costs, taxes, and
charges of any kind whatsoever shall be charged against income and what shall be
charged against  principal,  in accordance with the applicable  statutes as they
now exist and may from time to time be enacted, amended, or repealed.

                                       16

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                                        6

                             Relations with Trustee

         No one dealing with the Trustee  concerning the validity of anything he
purports  to do, or need see to the  application  of money paid or any  property
transferred to or upon the order of the Trustee.

                        Limitation of Trustee's Liability

         No Trustee  appointed  under this Trust  Agreement shall at any time be
held  liable  for any action or default of himself or his agent or of any person
in connection with the administration of the Trust Estate,  unless caused by his
own gross  negligence  or by a willful  commission by him of an act in breach of
trust.

                                  Compensation

         The original  trustee  hereunder  and all Successor  Trustees  shall be
entitled to reasonable compensation for their services as Trustee.

                                      Bond

         No bond shall be required of the original  Trustee  hereunder or of any
Successor Trustees; or if a bond is required by Law, no surety shall be required
on such bond.

                               Successor Trustees

          If  REGINALD  L.  DAVIS  resigns  or is unable to  continue  to act as
Trustee,  then  Settlor  names  and  appoints  HENRY W.  SIMON,  JR. to serve as
Successor  Trustee.  If HENRY W. SIMON,  JR. is unable or unwilling to serve for
any reason,  then Settlor names and appoints ROBERT SIMON as Successor  Trustee.
If ROBERT  SIMON is unable or  unwilling  to serve for any reason,  then Settlor
names and appoints  JEFFREY SIMON as Successor  Trustee.  Any Successor  Trustee
shall  succeed as Trustee  with like effect as though  originally  named as such
herein;  and all  authority  and  powers  conferred  upon the  original  Trustee
hereunder shall pass to any Successor Trustee.

                                       17

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                                        7

                                  ARTICLE SEVEN

                                Agreement Binding

         The Trustee by executing this  Agreement  accepts this Trust and agrees
to hold any property  acceptable to the Trustee added hereto in accordance  with
the terms and conditions  hereof.  This Agreement shall extend to and be binding
upon the heirs, executors, administrators, legal representative, and successors,
respectively, of the parties hereto.

         EXECUTED the day and year first above written.

                                                   /S/ Ronald W. Wellborn
                                           ------------------------------
                                           RONALD W. WELBORN, SETTLOR

                                                    /S/ Reginald Davis
                                           ---------------------------
                                           REGINALD L. DAVIS, TRUSTEE

                                       18

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                                        8

                                   WELBORN II

                             FAMILY TRUST AGREEMENT

                                  SCHEDULE "A"
                           TRUST ASSETS AND PROPERTIES

          1. Stock Certificate No. 1 of Global Universal,  Inc. of Delaware, for
775 (seven hundred seventy-five) shares of Common Stock.

                                                          /S/ Ronald W. Wellborn
                                                     ---------------------------
                                                     RONALD W. WELBORN, SETTLOR

                                                          /S/ Reginald Davis
                                                     ---------------------------
                                                     REGINALD L. DAVIS, TRUSTEE

                                       19

<PAGE>

                                        9

         THE STATE OF TEXAS

         COUNTY OF TARRANT

         BEFORE ME, the undersigned  authority,  on this day personally appeared
RONALD W. WELBORN,  known to me to be the person whose name is subscribed to the
forgoing  instrument,  and  acknowledged to me that he executed the same for the
purposes and consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 5th day of February, 1993

              /S/

         NOTARY PUBLIC, THE STATE OF TEXAS

         My Commission Expires:   7-16-93
         Notary's Printed Name:      Jerry Conditt

         THE STATE OF TEXAS

         COUNTY OF TARRANT

         BEFORE ME, the undersigned  authority,  on this day personally appeared
REGINALD L. DAVIS,  known to me to be the person whose name is subscribed to the
foregoing instrument,  and acknowledged to me that she executed the same for the
purposes and consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 5th day of February, 1993

              /S/

         NOTARY PUBLIC, THE STATE OF TEXAS

         My Commission Expires:   7-16-93
         Notary's Printed Name:      Jerry Conditt

                                       20<PAGE>

                                                                   EXHIBIT 10.22

                         SOFTWARE OEM LICENSE AGREEMENT

          This Software License and OEM Agreement ("Agreement") is entered into
this 19th day of May, 1997 (the "Effective Date") by and between Summit Design,
Inc., a Delaware corporation with principal offices at 9305 SW Gemini Drive,
Beaverton, Oregon 97008 and Test Systems Strategies, Inc., an Oregon corporation
(collectively, "SDI"), and Credence Systems Corporation, a Delaware corporation
with principal offices at 215 Fourier Avenue, Fremont, California 94539 ("CSC").

                                    RECITALS

          WHEREAS, CSC desires to purchase licenses to certain SDI software
products, and SDI desires to sell such licenses to CSC in accordance with the
terms of this Agreement; and

          WHEREAS, SDI desires to grant to CSC, and CSC desires to receive from
SDI, a non-exclusive license to bundle certain of SDI's products with certain
CSC products and to distribute such SDI products, in object code format only,
with CSC's products in accordance with the terms of this Agreement;

          NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants contained herein, the parties agree as follows:

                                    Section 1
                                   DEFINITIONS

          For purposes of this Agreement the following terms shall have the
meanings set forth below:

          1.1 CSC PRODUCTS. "CSC Products" means those CSC automatic test
equipment products which are described on SCHEDULE A attached to this Agreement,
as it may be amended from time to time by mutual agreement of the parties.

          1.2 SDI DOCUMENTATION. "SDI Documentation" means all written or
electronic technical documentation furnished by SDI during the term of this
Agreement that relates to the VTB Software.

          1.3 VTB. "VTB Software" means SDI's proprietary software, in
machine-readable, compiled object code format only, as more fully described on
SCHEDULE B, including any bug fixes, corrections, or other modifications
hereinafter furnished to CSC by SDI in connection with the VTB Software, whether
requested by CSC pursuant to a Maintenance Agreement between CSC and SDI or
initiated by SDI.

          1.4 MAINTENANCE AGREEMENT. "Maintenance Agreement" shall mean the
maintenance agreement for maintenance of the VTB Software in the form set forth
in SCHEDULE C.

          1.5 END USER LICENSE AGREEMENT. "End User License Agreement" shall
mean the end user license agreement for the VTB Software in the form set forth
in SCHEDULE E.

<PAGE>

                                    Section 2
                         PURCHASE GRANT AND DELIVERABLES

          2.1 VTB SOFTWARE LICENSE PURCHASE. CSC shall purchase licenses to the
VTB Software for the prices and in the quantity set forth in SCHEDULE D, in
accordance with the terms set forth in SCHEDULE D. Each of such licenses shall
be subject to the terms of the End User License Agreement.

          2.2 MAINTENANCE PURCHASE. CSC and SDI shall execute the Maintenance
Agreement set forth in SCHEDULE C, as of the date hereof. CSC shall sign an
irrevocable purchase order for such Maintenance Agreement for eighteen (18)
months of maintenance for an aggregate purchase price of $2,000,000. Payment
shall be made upon Closing (as defined in the Asset Purchase Agreement among
CSC, SDI and Test Systems, Inc.) ("Closing") by wire transfer to a bank account
designated by SDI.

          2.3 DISTRIBUTION LICENSE. Subject to the terms and conditions of this
Agreement, SDI hereby grants to CSC and its affiliates, under all of SDI's
intellectual property rights in and to the VTB Software, a worldwide,
non-exclusive, non-transferable (except as provided in Section 10.2 below)
license to use the VTB Software for internal purposes (provided a license for
such use has been purchased from SDI) and distribute units of VTB Software
purchased hereunder through its normal distribution channels, in
machine-readable, compiled object code format only, and only when bundled with
CSC Products or sold to customers of CSC who have purchased CSC Products. For
each CSC Product sold to a customer, CSC shall only issue one (1) VTB Software
license and the VTB Software shall only be distributed to end users who agree to
be bound by the terms of the End User License Agreement. Except as expressly
provided in Section 2.4 below, CSC shall have no right to sublicense the rights
granted hereunder by SDI, provided that CSC and its affiliates may use
subdistributors in their distribution efforts ' CSC agrees that it shall be
responsible for the compliance of its affiliates and subdistributors of the
relevant terms of this Agreement. CSC shall not distribute or market the VTB
Software in any manner except as expressly provided in this Section 2.3.
Notwithstanding the foregoing, SDI agrees that it shall not distribute the VTB
Software through OEM's which are automatic test equipment vendors to the
semiconductor industry prior to January 1, 2000.

         2.4      SUBLICENSING OF VTB SOFTWARE BY CSC.

                  2.4.1    RESTRICTIONS. Each unit of VTB Software shall be
distributed by CSC with a license in the form set forth on SCHEDULE E.

                  2.4.2    INDEMNITY.  CSC shall be solely responsible for, and
SDI shall have no obligation to honor, any warranties that CSC provides to its
customers with respect to the VTB Software that are in addition to, or
inconsistent with, the warranties provided by SDI in this Agreement or the End
User License Agreement. CSC shall defend any claim against SDI arising in
connection with any such warranties to CSC's customers, express, implied,
statutory, or otherwise, and shall pay any settlements or damages awarded to SDI
that are based on any such warranty.

                  2.4.3    INFRINGEMENTS.  CSC agrees to use reasonable
commercial efforts to enforce violations or infringements under any agreements
for the VTB Software with its customers and to inform SDI promptly of any known
violation, infringement or breach.

         2.5  DOCUMENTATION. SDI shall provide the SDI Documentation include
with each unit of the VTB Software.

<PAGE>

          2.6 PROPRIETARY NOTICES. CSC shall not remove, efface or obscure any
copyright notices or other proprietary notices or legends from any SDI materials
provided hereunder.

          2.7 OWNERSHIP. SDI shall retain all right, title and interest,
including all intellectual property rights, in and to the VTB Software and SDI
Documentation, except as otherwise provided in the Software Development
Agreement of even date herewith.

          2.8 REPORTING. CSC shall, within thirty (30) days of the end of each
calendar quarter during the term of this Agreement, prepare a report summarizing
the number and type of copies of VTB Software distributed during such quarter.

          2.9 AUDIT. CSC shall maintain complete and accurate accounting
records, in accordance with sound accounting practices, to support and document
VTB Software licenses distributed in connection with this Agreement. Such
records shall be retained for a period of at least two (2) years after the year
to which they pertain.

          2.10 VTB SOFTWARE STEERING COMMITTEE. SDI and CSC will each appoint
two (2) representatives to a steering committee to coordinate information on the
development of the VTB Product in accordance with Section 2.1 of the Software
Development Agreement of even date herewith.

                                    Section 3
                                 SDI TRADEMARKS

          CSC acknowledges that the symbols, trademarks and service marks
adopted by SDI or its suppliers to identify the VTB Software, as set forth in
SCHEDULE F attached to this Agreement (the "Trademarks"), belong to SDI and its
suppliers and that CSC shall have no rights in such Trademarks except as
expressly set forth herein. All VTB Software distributed by CSC hereunder and
all documentation, associated brochures, packaging and advertising shall display
the Trademarks in accordance with SDI's reasonable instruction, samples of all
materials that may be distributed by CSC displaying the Trademarks shall be
submitted to SDI upon SDI's reasonable request, and the Trademarks shall be used
only in a form so approved by SDI.

                                    Section 4
                                      TERM

          4.1 INITIAL TERM. This Agreement shall become effective on the
Effective Date and shall remain in effect until January 1, 2000. This Agreement
may be renewed upon the mutual written agreement of the parties. Each party's
remedy for breach of this Agreement shall be an action for damages or injunctive
relief; neither party shall be entitled to terminate this Agreement for any
reason.

          4.2 SURVIVAL. The sublicenses granted to end users pursuant to Section
2.4.1 shall survive the expiration of this Agreement pursuant to their terms.
Also, provisions of Sections 2.7 (Ownership), 2.10 (Audit), 4 (Term), 5
(Confidentiality), 9 (Limitation of Liability) and 10 (Miscellaneous) shall
survive the expiration of this Agreement.

<PAGE>

                                    Section 5
                                 CONFIDENTIALITY

          5.1 OBLIGATIONS. Each party (the "receiving party") acknowledges and
agrees that any business and technical information PROVIDED TO THE RECEIVING
PARTY BY the other party (the "disclosing party") hereunder constitutes the
confidential and proprietary information of the disclosing party, and that the
receiving party's protection thereof is essential to this Agreement and a
condition to the receiving party's use and possession thereof. The receiving
party shall retain in strict confidence and not disclose to any third party
(except as authorized by this Agreement) without the disclosing party's express
written consent, any and all such information. CSC acknowledges and agrees that
the VTB Software is confidential and proprietary information of SDI.

          5.2 EXCEPTIONS. The receiving party shall be relieved of this
obligation of confidentiality to the extent any such information:

              (i)  was in the public domain at the time it was disclosed or has
         become in the public domain through no fault of the receiving party;

              (ii)  the receiving  party can prove was known to the receiving
         party, without  restriction,  at the time of disclosure as shown by the
         files of the receiving party in existence at the time of disclosure;

              (iii) is  disclosed  by the  receiving  party  with the  prior
         written approval of the disclosing  party;

              (iv)  the receiving party can prove was independently developed by
         the receiving party without any use of the disclosing party's
         confidential  information and by employees or other agents of the
         receiving  party  who have not had  access to any of the disclosing
         party's confidential information; or

              (v)  becomes known to the receiving party, without restriction,
         from a source other than the disclosing party without breach of this
         Agreement by the receiving party and otherwise not in violation of the
         disclosing party's rights.

          5.3 SOURCE CODE PROTECTIONS. Unless as otherwise permitted under this
Agreement or another written agreement between CSC and SDI, CSC shall not under
any circumstances attempt, or knowingly permit others to attempt, to decompile,
decipher, disassemble, reverse engineer or otherwise determine the source code
for the VTB Software.

          5.4 CONFIDENTIALITY AGREEMENTS. The receiving party, prior to
permitting access by any individual to any of the disclosing party's
confidential information, shall enter into a confidentiality agreement with each
such individual which (i) incorporates the protections and restrictions set
forth herein for the disclosing party's confidential information; (ii) provides
that the individual's obligations with respect to the disclosing party's
confidential information shall continue after termination of the individual's
employment, consulting relationship or other relationship with the receiving
party; and (iii) provides that the disclosing party is a direct and intended
beneficiary of the agreement and entitled to enforce it directly against the
individual.

          5.5 NOTIFICATION OF SECURITY BREACH. The receiving party agrees to
notify the disclosing party promptly in the event of any breach of its security
under conditions in which it would appear that the trade secrets contained in
the VTB Software were prejudiced or exposed to loss. The receiving party shall,
upon request of the disclosing party, take all other reasonable steps necessary
to

<PAGE>

          recover any compromised trade secrets disclosed to or placed in the
possession of the receiving party by virtue of this Agreement. The cost of
taking such steps shall be borne solely by the receiving party.

          5.6 INJUNCTIVE RELIEF. Each receiving party acknowledges that any
breach of any of its obligations with respect to confidentiality or use of the
disclosing party's confidential information hereunder is likely to cause or
threaten irreparable harm to the disclosing party, and, accordingly, the
receiving party agrees that in the event of such breach the disclosing party
shall be entitled to seek equitable relief to protect its interest therein,
including but not limited to preliminary and permanent injunctive relief, as
well as money damages.

                                    Section 6
                         REPRESENTATIONS AND WARRANTIES

          6.1 WARRANTY OF TITLE. SDI warrants and represents to CSC that (i) CSC
shall acquire good and clear title to the VTB Software, free and clear of all
liens and encumbrances, (ii) all materials and services provided hereunder
including, without limitation, the VTB Software, are either owned or properly
licensed by SDI or are in the public domain and the use thereof by CSC, its
representatives, distributors or dealers will not infringe any proprietary
rights of any third party; provided, however, that SDI's obligations under
Section 7 shall be CSC's sole remedy for any breach of this warranty; and (iii)
SDI has the full power to enter into this Agreement, to carry out its
obligations under this Agreement and to grant the rights and licenses granted to
CSC in this Agreement.

          6.2 PRODUCT WARRANTY. SDI warrants the VTB Software under the warranty
set forth in the End User License Agreement.

                                    Section 7
                                 INDEMNIFICATION

          7.1 INDEMNIFICATION BY SDI. SDI agrees to indemnify, defend and hold
harmless CSC, its affiliates, and their respective officers, directors,
employees, distributors, agents, successors and assigns from and against any and
all loss, damage, settlement or expense (including reasonable legal expenses),
as incurred, resulting from or arising out of any claims which allege that the
VTB Software or the use or sale thereof infringe upon, misappropriate or violate
any patents, copyrights, or trade secret rights or other proprietary rights of
persons, firms or entities who are not parties to this Agreement; provided that
CSC (i) promptly notifies SDI, in writing, of any notice or claim of such
alleged infringement or misappropriation involving the VTB Software of which it
becomes aware; (ii) permits SDI to control, the defense, settlement, adjustment
or compromise of any such claim; (iii) the claim does not result from
modification of the VTB Software which modification is not authorized by SDI;
and (iv) the claim does not result from the COMBINATION OF THE VTB SOFTWARE WITH
SOFTWARE OR EQUIPMENT NOT PROVIDED BY SDI if the VTB Software alone would not be
the subject of the claim. CSC may employ counsel, at its own expense (provided
that if such counsel is necessary because SDI does not assume control, SDI will
bear such expense), to assist it with respect to any such claim. CSC shall have
no authority to settle any claim on behalf of SDI.

          7.2 INJUNCTION. If by reason of such infringement claim, CSC or its
customers shall be prevented or are likely to be prevented by legal means from
selling or using any VTB Software, or if, in SDI's opinion, such claim is likely
to occur, SDI will use its commercially reasonable efforts, at its

<PAGE>

expense, to: (i) obtain all rights required to permit the sale or use of the VTB
Software BY CSC; or (ii) modify or replace such VTB Software to make then
non-infringing (and extend this indemnity thereof), provided that any such
replacement or modified VTB is functionally equivalent to the VTB Software. If
SDI is unable to achieve either of the options set forth above within a
reasonable period of time after the issuance of the injunction, or reasonably
believes that an injunction will issue and that such options cannot be achieved
within a reasonable period of time, then neither party will sell or distribute
the VTB Software in accordance with the terms of such injunction-or SDI's
reasonable instructions. Notwithstanding the foregoing, all payments due from
CSC hereunder shall be paid whether or not the VTB Software may be used, sold or
distributed by any of the parties under such injunction or instructions of SDI.
This Section 7 states SDI's entire obligation with respect to claims that the
VTB Software or any rights therein infringe or misappropriate the rights of any
third party.

                                    Section 8
                             CSC WAVEBRIDGE PRODUCTS

          CSC agrees to sell CSC Wavebridge products to SDT's customers who have
purchased VTB Software from SDI. Upon CSC's approval, subject to SDI executing
CSC's standard Sales Representative Agreement, SDI may solicit orders from its
VTB Software customers for CSC Wavebridge products, in which case CSC shall pay
to SDI a commission of forty percent (40%) of the amount received from CSC under
such sale.

                                    Section 9
                             LIMITATION OF LIABILITY

          EXCEPT FOR THE INDEMNIFICATION OBLIGATIONS IN SECTIONS 2.4.2 AND 7,
AND THE CONFIDENTIALITY OBLIGATIONS IN SECTION 5, IN NO EVENT SHALL EITHER
PARTY'S LIABILITY ARISING OUT OF THIS AGREEMENT OR THE TERMINATION OF THIS
AGREEMENT EXCEED THE AMOUNTS PAID BY CSC TO SDI PURSUANT TO THIS AGREEMENT. IN
NO EVENT SHALL EITHER PARTY HAVE ANY LIABILITY FOR ANY INDIRECT, INCIDENTAL,
SPECIAL OR CONSEQUENTIAL DAMAGES, HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
ARISING OUT OF THIS AGREEMENT, INCLUDING BUT NOT LIMITED TO LOSS OF ANTICIPATED
PROFITS, EVEN IF SUCH PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
THESE LIMITATIONS SHALL APPLY NOTWITHSTANDING ANY FAILURE OF ESSENTIAL PURPOSE
OF ANY LIMITED REMEDY.

                                   Section 10
                                  MISCELLANEOUS

          10.1 CONFIDENTIALITY OF AGREEMENT. Both SDI and CSC agree that the
terms and conditions of this Agreement shall be treated as confidential
information and that no reference to the terms and conditions of this Agreement
or to activities pertaining thereto can be made in any form without the prior
written consent of the other party; provided, however, that the general
existence of this Agreement shall not be treated as confidential information and
that either party may disclose the terms and conditions of this Agreement:

<PAGE>

              (i)  as required by any court or other governmental body;

              (ii) as otherwise  required by law including SDI's obligations
              under  applicable  securities  laws;

              (iii) to legal counsel of the  parties;

              (iv)  in  confidence,  to accountants,  banks, proposed investors,
               and financing sources and their advisors;

              (v) in confidence,  in connection with the enforcement of this
              Agreement  or  rights  under  this   Agreement;   or

              (vi)  in confidence,  in  connection  with a merger or acquisition
              or proposed merger or acquisition, or the like.

          10.2 ASSIGNMENT. Neither this Agreement nor any rights, licenses or
obligations hereunder, may be assigned by either party without the prior written
approval of the non-assigning party. Notwithstanding the foregoing, either party
may assign this Agreement to a subsidiary or any acquiror of all or of
substantially all of such party's may assign this Agreement to any acquiror of
all or of substantially all of such party's equity securities, assets or
business relating to the subject matter of this Agreement, except to a direct
competitor of the other party. As a condition to such purported assignment, the
purported assignor shall provide to the other party written confirmation prior
to such assignment of such successor's assumption of this Agreement. Any
attempted assignment in violation of this Section shall be void and without
effect. Subject to the foregoing, this Agreement will benefit and bind the
parties' successors and assigns.

          10.3 NOTICES. All notices between the parties shall be in writing and
shall be deemed to have been given if personally delivered or sent by certified
or registered mail (return receipt) or telecopy to the addresses set forth as
follows, or such other address as is provided by notice as set forth herein:

         If to SDI to:              Summit Design, Inc.
                                    9305 SW Gemini Drive
                                    Beaverton, Oregon 97008
                                    Attn.:  Larry J. Gerhard

         with a copy to:            Wilson Sonsini Goodrich & Rosati
                                    650 Page Mill Road
                                    Palo Alto, California 94304-1050
                                    Attn.:  Steven Bernard

         If to CSC to:              Credence Systems Corporation
                                    215 Fourier Avenue
                                    Fremont, California 94539
                                    Attn.:  Wilmer R. Bottoms

         with a copy to:            Brobeck, Phleger & Harrison LLP
                                    2200 Geng Road
                                    Palo Alto, California 94303
                                    Attn.:  Warren Lazarow

<PAGE>

Notices shall be deemed  effective  upon receipt or, if delivery is not effected
by reason of some fault of the addressee, when tendered.

          10.4 RELATIONSHIP OF THE PARTIES. The parties hereto expressly
understand and agree that each party is an independent contractor in the
performance of each and every part of this Agreement, is solely responsible for
all of its employees and agents and its labor costs and expenses arising in
connection therewith. Neither party nor its agents or employees are the
representatives of the other party for any purpose and neither party has the
power or authority as agent, employee or any other capacity to represent, act
for, bind or otherwise create or assume any obligation on behalf of the other
party for any purpose whatsoever.

          10.5 IMPORT AND EXPORT. Upon CSC's request, SDI shall provide all
information under its control which is necessary or useful for CSC to obtain any
export or import licenses required for CSC to ship or receive VTB Software,
including, but not limited to, certificates of origin, (NAFTA, etc.),
manufacturer's affidavits, and Buy America qualification, if applicable. This
information is to be provided within ten (10) business days of CSC's request.

          10.6 GOVERNING LAW; FORUM SELECTION. This Agreement shall be governed
by the laws of the State of California, without reference to its conflict of
laws principles. All disputes arising out of this Agreement shall be subject to
the exclusive jurisdiction and venue of the California state courts of Santa
Clara County, California (or, if there is exclusive federal jurisdiction, the
United Stated District Court for the Northern District of California), and the
parties consent to the personal and exclusive jurisdiction of these courts.

          10.7 SEVERABILITY. Any term or provision of this Agreement held to be
illegal or unenforceable shall, if possible, be interpreted so as to be
construed as valid, but in any event the validity or enforceability of the
remainder hereof shall not be affected.

          10.8 EXPORT REGULATIONS. CSC understands that SDI is subject to
regulation by agencies of the U.S. government, including the U.S. Department of
Commerce, which prohibit export or diversion of certain technical products to
certain countries. CSC warrants that it will comply in all respects with the
export and re-export restrictions applicable to the technology and documentation
licensed hereunder.

         10.9 WAIVER.  The waiver of, or failure to enforce, any breach or
default hereunder shall not constitute the waiver of any other or subsequent
breach or default.

          10.10 ENTIRE AGREEMENT. This Agreement, along with the Schedules
attached hereto which are incorporated herein by reference, sets forth the
entire Agreement between the parties and supersedes any and all prior proposals,
agreements, and representations between them, whether written or oral. This
Agreement may be changed only by mutual agreement of the parties in writing.

                  [Remainder of page intentionally left blank.]
                                        -

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be signed by duly authorized officers or representatives as of the Effective
Date.

         SUMMIT DESIGN, INC.             CREDENCE SYSTEMS CORPORATION

BY:       /s/ Larry J. Gerhard           BY:     /s/ Richard Y. Okumoto

Name:       Larry J. Gerhard             Name:    Richard Y. Okumoto

Title:     President, CEO                Title:   Executive Vice President & CFO

Date:      5/19/97                       Date:    Date: 5/19/97

                                      -10-

<PAGE>

                                   SCHEDULE A

                                  CSC PRODUCTS

VISTA/DUO SERIES TESTERS
SC SERIES TESTERS

<PAGE>

                                   SCHEDULE B

                                  VTB SOFTWARE

VISUAL TESTBENCH COMPONENTS

Visual Testbench consists of modified Visual HDL for Verilog and VHDL, Visual IF
Testbench harness code, Visual HDL simulation interface, various internal TDS
routines, WDB input/output routines and Visual Testbench on-line documentation.
For customer delivery these source code modules are compiled to a single Visual
Testbench binary executable module.

A Testbench is created using the Visual HDL Flow chart editor, Block diagram
editor and Waveform/Timing diagram editor. The Testbench is connected to the
simulated circuit using the Visual HDL Block Diagram editor and the Visual
Testbench Launch editor.

The Testbench harness is compiled with the customer's simulator and design as to
stimulate and examine the circuit under investigation. The Testbench harness
reads and writes TSSI WDB databases through binary linkable library functions.

The examples include Visual HDL databases and Verilog or VHDL codes sufficient
to demonstrate basic and advanced product operation. The examples are
operational and will produce legitimate WDB output.

DOCUMENTATION

Visual Testbench documentation consists of a binary file in Framemaker mif
format describing theory of operation, external controls, and function call
interface of the product. The mif file is interpreted by a view for run time
viewing of the test.

<PAGE>

                                   SCHEDULE C

                              MAINTENANCE AGREEMENT

This Maintenance Agreement ("Agreement") is entered into between Summit Design,
Inc., a Delaware Corporation ("Summit") and Credence Systems Corp. ("CSC") for
the products described in the Software OEM License Agreement between Summit and
CSC ("the Software"), which is incorporated herein by this reference.

IN CONSIDERATION OF THE MUTUAL COVENANTS SET FORTH HEREIN,  THE PARTIES AGREE AS
FOLLOWS:

1.   FEES

During the term of this Agreement and any renewal term thereof, Customer shall
pay a maintenance fee for each term ("the Maintenance Feel') as determined by
the parties. The Maintenance Fee is due upon the execution of this Agreement, or
the expiration of any applicable warranty period for the above-described
Software ("Software"), whichever last occurs.

2. TERM

The term of this Agreement shall be eighteen (18) months. Thereafter, this
Agreement can be renewed for successive annual day period immediately prior to
the expiration renewal term. After the eighteen months, this by either party
upon thirty (30) days' written event of termination by Customer, Summit shall
any advance maintenance fees, and any fees due terms within the ninety (90) of
the current term or any Agreement may be terminated notice: however, in the not
be obligated to refund and payable shall remain due and payable without
adjustment for early termination.

3.   CUSTOMER OBLIGATIONS

     To facilitate Summit's performance under this Agreement, Customer shall:

     3.1  Promptly notify Summit in writing or by telephone of the need for
          maintenance services, the Software License Agreement Number, the
          Serial Numbers and Release Numbers of the Software, the location of
          the Software site number, a description of the CPU on which the
          Software is being used, and the nature of the problem.

     3.2  Cooperate with Summit as reasonably necessary to identify the nature
          and cause of the problem.

     3.3  Allow Summit access to Customers' hardware, products, systems and
          information (including confidential information), as may be reasonably
          necessary to facilitate Summit's identification of the nature, cause
          and potential remedy of the problem, all subject to Customers'
          security and safety rules.

4.   SUMMIT'S OBLIGATIONS

     4.1  During the term of the Agreement and any renewal term thereof, Summit
          shall respond to CSC requirements for telephone technical support and
          bug fix requests.

<PAGE>

5.   SPECIAL TERMS AND CONDITIONS

     5.1. This maintenance agreement does not provide for upgrade releases.

     5.2  This Agreement shall apply to the Software in its standard form, and
          shall not apply to custom enhancements and modifications. Any
          requested service on custom enhancements and modifications shall be
          charged to Customer at Summit Design's standard service rates then in
          effect.

     5.3  This Agreement shall apply only to the original release of the
          Software.

     5.4  Although Summit will exert reasonable efforts to provide prompt
          service, Summit is not liable for damages resulting from delay in the
          provision of service caused by circumstances beyond reasonable
          control.

     5.5  Summit's maintenance obligations under this Agreement do not include;
          (a) services connected with system reconfiguration or relocation, (b)
          service resulting from neglect, misuse or accidental damages to the
          Software, (c) service resulting from modifications or repairs of the
          Software without Summit's authority, (d) service resulting from the
          failure of Customer to provide and maintain a suitable installation
          environment, (e) service resulting from the use of the Software for
          other than the purposes for which it was designed, (f) the provision
          of supplies, accessories, or media.

<PAGE>

                                   SCHEDULE D

                             LICENSE FEE AND PAYMENT

Per Copy License Fee:
US $40,000.00

Payment and Delivery Schedule:

          CSC shall issue to SDI an irrevocable purchase order for four hundred
(400) VTB Software licenses for the amount of $16,000,000 on the Closing. Also
on the Closing, CSC shall establish an irrevocable letter of credit with a
nationally recognized financial institution reasonably acceptable to SDI, in the
amount of $16,000,000 for payment of such four hundred (400) VTB Software
licenses. SDI shall have the right to ship up to the number of licenses
corresponding to the maximum payments set forth below and SDI shall receive the
payment calculated at $40,000 per license, drawn from the letter of credit upon
each such shipment. If SDI does not ship the permitted maximum during a quarter,
the shortfall will be carried forward to the next quarter's maximum amount.

<TABLE>
<CAPTION>

                  Year and
                   Calendar         Quarterly                        Annual
                    Quarter         Maximum                          Maximum
                  ------------     ------------                    ------------
<S>               <C>   <C>        <C>                             <C>
                  1997  Ql
                  1997  Q2
                  1997  Q3         $   3,900,000
                  1997  Q4         $   3,300,000
                  1997  Total                                      $   6,200,000
                  1998  Ql         $   2,900,000
                  1998  Q2         $   2,300,000
                  1998  Q3         $   2,200,000
                  1998  Q4         $   1,400,000
                  1998  Total                                      $   8,800,000
                  1999  Ql           $   400,000
                  1999  Q2           $   300,000
                  1999  Q3           $   250,000
                  1999  Q4            $   50,000
                  1999  Total                                      $   1,000,000
</TABLE>

Shipment of VTB Software  shall be made by the  fifteenth day of the first month
for each  quarter  and  payment  shall be drawn from the letter of credit on the
same day. VTB Software will be shipped to CSC via overnight courier.

<PAGE>

                                   SCHEDULE E

                           END USER LICENSE AGREEMENT

This is a legal Agreement between you, the end user, and Summit Design, Inc. By
opening this sealed media package and/or by using the Software, you are agreeing
to be bound by the terms of this Agreement.

GRANT OF LICENSE. Summit Design, Inc. ("Summit") grants you the right to use one
(1) copy of the enclosed Summit software program and accompanying documentation
(together with any upgrades supplied by Summit, the "Software") according to the
conditions specified below. Usage area to be less than one kilometer in radius
and subject to the terms and conditions of this Agreement. All rights not
expressly granted herein are reserved by Summit, its suppliers, licensors, or
successors.

YOU MAY:
a.   Install the Software and its License Manager (FlexLM) on only one computer
     or workstation;
b.   make no more than one (1) copy of the  Software in machine  readable  form,
     solely for back-up purposes, provided that you reproduce all
     proprietary notices on the copy; and
c.   physically transfer the Software from one computer to another, provided
     that the Software is used on only one computer at a time, and within a
     usage area to be less than one kilometer in radius.

YOU MAY NOT:
a.   Use the Software on more than one computer or workstation at a time;
b.   modify, translate, reverse engineer, decompile, disassemble, create
     derivative works based on, or copy (except to create the back-up copy) the
     Software;
c.   rent, lend,  transfer,  distribute,  or grant any rights in the Software in
     any form to any person without the written consent of Summit;
d.   remove any proprietary notices, labels, or marks from the Software; or
e.   operate the Software on networks where two client nodes using Summit
     products of this type are greater than two (2) kilometers from each other
     (WAN).

UPGRADE PRODUCTS. Any upgrades to the Software may only be used in conjunction
with the prior version of the Software.

LIMITED WARRANTY AND DISCLAIMER. Summit warrants that for a period of ninety
(90) days from the date of sale of the Software to you, the media on which the
Software is furnished will, under normal use, be free from defects in materials
and workmanship. Summit's entire liability and your exclusive remedy under this
warranty (which is subject to you returning the Software to Summit) will be, at
Summit's option, to replace the media or to refund the purchase price and
terminate this Agreement. Except for these express limited warranties, Summit
makes, and you receive, no warranties or conditions, express, implied,
statutory, or otherwise, and Summit specifically disclaims any implied
warranties of merchantability, noninfringement and fitness for a particular
purpose. Summit does not warrant that the Software will meet your requirements
or that the operation of the Software will be uninterrupted or error free. You
assume the responsibility for the selection of your requirements, software, and
hardware to achieve your intended results; for installation; for use; and that
the operations of the Software will be uninterrupted or error free. Some States
do not allow the exclusion of implied warranties so that the above exclusions
may not apply to you. This warranty gives you specific legal rights. You may
also have other rights which vary from State to State.

<PAGE>

PROPRIETARY RIGHTS. This license is not a sale. Title and copyrights to the
Software and accompanying documentation, including the enclosed copies and any
copy made by you, remain with Summit or its suppliers, licensors, or successors.

LIMITATION OF LIABILITY. Summit's liability arising out of this Agreement shall
not exceed the amounts paid by you to obtain the Software. In no event will
Summit be liable for any loss of data, lost opportunity of profits, cost of
cover, or special, incidental, consequential, or indirect damages arising from
the use of the Software in this Agreement, however caused and on any theory of
liability. These limitations will apply even if Summit or an authorized dealer
has been advised of the possibility of such damage, and notwithstanding any
failure of essential purpose of any limited remedy. You acknowledge that the
amount paid for the Software reflects this allocation of risk. Some States do
not allow the limitation or exclusion of liability for incidental or
consequential damages, so the above limitation or exclusion may not apply to
you.

EXPORT RESTRICTIONS. You agree that you will not export or re-export the
Software in any form without the appropriate United States and foreign
government licenses, and Summit written approval. Your failure to comply with
this provision is a material breach of this contract. If you need advice on such
export laws and regulations, you should contact the U.S. Department of Commerce,
Export Division, Washington, DC 20230, USA , for clarification.

TERMINATION. This Agreement is effective until terminated. You may terminate
this Agreement at any time by removing from your system and destroying all
copies of the Software and the accompanying documentation. Unauthorized copying
of the software or the accompanying documentation or otherwise failing to comply
with the terms and conditions of this Agreement will result in automatic
termination of this Agreement and will make available to Summit other legal
remedies. Upon termination of this Agreement, the license granted herein will
terminate and you must immediately destroy the Software and accompanying
documentation, and all back-up copies thereof.

U.S. GOVERNMENT USE. The Software and accompanying documentation are deemed to
be "commercial computer software" and "commercial computer software
documentation," respectively, pursuant to DFAR Section 227.7202 and FAR Section
12.212, as applicable. Any use, modification, reproduction, release, performing,
displaying or disclosing of the Software and accompanying documentation by the
U. S. Government shall be governed solely by the terms of this Agreement and
shall be prohibited except to the extent expressly permitted by the terms of
this Agreement.

MISCELLANEOUS. This is the entire Agreement between the parties relating to the
subject matter hereof and no waiver or modification of the Agreement shall be
valid unless signed by each party. The waiver of a breach of any term hereof
shall in no way be construed as a waiver of any other term or breach hereof. If
any provision of this Agreement shall be held by a court of competent
jurisdiction to be contrary to law, the remaining provisions of this Agreement
shall remain in full force and effect. This Agreement is governed by the laws of
the State of Oregon without reference to conflict of laws principles. All
disputes arising out of this Agreement shall be subject to the exclusive
jurisdiction of the state and federal courts located in Multnomah County,
Oregon, and the parties agree and submit to the personal and exclusive
jurisdiction and venue of these courts. Should you have any question about this
Agreement, or if you desire to contract Summit Design, Inc., please write:
Summit Design, Inc., 9305 S.W. Gemini Drive, Beaverton, Oregon 97008 USA
(503-643-9281).

BEFORE OPENING THIS ENVELOPE, carefully read the License Agreement on the
reverse side of this envelope. By opening this envelope and/or by using the
software contained herein, you are agreeing to be bound by the terms of the
License Agreement.

<PAGE>

                                   SCHEDULE F

                                   TRADEMARKS

     Visual Test           Serial No. 75/002, 501          US
     Visual Test           11216-TM1003                    US
     Visual Testbench      11216-TM1034                    International Class 9

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