CADENCE DESIGN SYSTEMS, INC.

                                    COMMON STOCK
                              (PAR VALUE $.01 PER SHARE)

                                    _______________

                           FORM OF UNDERWRITING AGREEMENT

                                                             November __, 1996


Goldman, Sachs & Co.,
Morgan Stanley & Co. Incorporated
  As representatives of the several Underwriters
    named in Schedule I hereto
c/o Goldman, Sachs & Co.
85 Broad Street,
New York, New York 10004.

Ladies and Gentlemen:

     Cadence Design Systems, Inc., a Delaware corporation (the "Company"), 
proposes, subject to the terms and conditions stated herein, to issue and 
sell to the Underwriters named in Schedule I hereto (the "Underwriters") an 
aggregate of 5,000,000 shares (the "Firm Shares") and, at the election of the 
Underwriters, up to 750,000 additional shares (the "Optional Shares") of 
Common Stock, $.01 par value per Share ("Stock"), of the Company (the Firm 
Shares and the Optional Shares that the Underwriters elect to purchase 
pursuant to Section 2 hereof being collectively called the "Shares").

     1. The Company represents and warrants to, and agrees with, each of the 
Underwriters that:



      (a) A registration statement on Form S-3 (File No. 333-_________) the 
   "Initial Registration Statement") in respect of the Shares has been filed 
   with the Securities and Exchange Commission (the "Commission"); and any 
   post-effective amendment thereto, each in the form heretofore delivered to 
   you, and, excluding exhibits thereto but including all documents incorporated
   by reference in the prospectus contained therein, to you for each of the 
   other Underwriters, have been declared effective by the Commission in such 
   form; other than a registration statement, if any, increasing the size of the
   offering (a "Rule 462(b) Registration Statement"), filed pursuant to Rule 
   462(b) under the Securities Act of 1933, as amended (the "Act"), which became
   effective upon filing, no other document with respect to the Initial 
   Registration Statement or document incorporated by reference therein has 
   heretofore been filed with the Commission; and no stop order suspending the 
   effectiveness of the Initial Registration Statement, any post-effective 
   amendment thereto or the Rule 462(b) Registration Statement, if any, has been
   issued and no proceeding for that purpose has been initiated or threatened by
   the Commission (any preliminary prospectus included in the Initial 
   Registration Statement or filed with the Commission pursuant to Rule 424(a) 
   of the rules and regulations of the Commission under the Act, is hereinafter
   called a "Preliminary Prospectus"); the various parts of the Initial 
   Registration Statement and the Rule 462(b) Registration Statement, if any, 
   including all exhibits thereto and including (i) the information contained in
   the form of final prospectus filed with the Commission pursuant to Rule 
   424(b) under the Act in accordance with Section 5(a) hereof and deemed by 
   virtue of Rule 430A under the Act to be part of the Initial Registration 
   Statement at the time it was declared effective and (ii) the documents 
   incorporated by reference in the prospectus contained in the registration 
   statement at the time such part of the registration statement became 
   effective, or such part of the Rule 462(b) Registration Statement, if any, 
   became or hereafter becomes effective, each as amended at the time such part 
   of the registration statement became effective, is hereinafter collectively 
   called the "Registration Statement"; such final prospectus, in the form first
   filed pursuant to Rule 424(b) under the Act, is hereinafter called the 
   "Prospectus"; any reference herein to any Preliminary Prospectus or the 
   Prospectus shall be deemed to refer to and include the documents incorporated
   by reference therein pursuant to Item 12 of Form S-3 under the Act, as of the
   date of such Preliminary Prospectus or Prospectus, as the case may be; and 
   any reference to any amendment or supplement to any Preliminary Prospectus or
   the Prospectus shall be deemed to refer to and include any documents filed 
   after the date of such Preliminary Prospectus or Prospectus, as the case may
   be, under the Securities Exchange Act of 1934, as amended (the "Exchange 
   Act"), and incorporated by reference in such Preliminary Prospectus or 
   Prospectus, as the case may be; and any reference to any amendment to the 
   Registration Statement shall be deemed to refer to and include any annual 
   report of the Company filed pursuant to Section 13(a) or 15(d) of the 
   Exchange Act after the effective date of the Initial Registration Statement
   that is incorporated by reference in the Registration Statement;

      (b) No order preventing or suspending the use of any Preliminary 
   Prospectus has been issued by the Commission, and each Preliminary 
   Prospectus, at the time of filing thereof, conformed in all material respects
   to the requirements of the Act and the rules and regulations of the 
   Commission thereunder, and did not contain an untrue statement of a material 
   fact or omit to state a material fact required to be stated therein or 
   necessary to



   make the statements therein, in the light of the circumstances 
   under which they were made, not misleading; PROVIDED, HOWEVER, that this 
   representation and warranty shall not apply to any statements or omissions 
   made in reliance upon and in conformity with information furnished in writing
   to the Company by an Underwriter through Goldman, Sachs & Co. expressly for 
   use therein;

      (c) The documents incorporated by reference in the Prospectus, when 
   they became effective or were filed with the Commission, as the case may be, 
   conformed in all material respects to the requirements of the Act or the 
   Exchange Act, as applicable, and the rules and regulations of the Commission 
   thereunder, and none of such documents contained an untrue statement of a 
   material fact or omitted to state a material fact required to be stated 
   therein or necessary to make the statements therein not misleading; and any 
   further documents so filed and incorporated by reference in the Prospectus or
   any further amendment or supplement thereto, when such documents become 
   effective or are filed with the Commission, as the case may be, will conform 
   in all material respects to the requirements of the Act or the Exchange Act, 
   as applicable, and the rules and regulations of the Commission thereunder and
   will not contain an untrue statement of a material fact or omit to state a 
   material fact required to be stated therein or necessary to make the 
   statements therein not misleading;

      (d) The Registration Statement conforms, and the Prospectus and any 
   further amendments or supplements to the Registration Statement or the 
   Prospectus will conform, in all material respects to the requirements of the 
   Act and the rules and regulations of the Commission thereunder and do not and
   will not, as of the applicable effective date as to the Registration 
   Statement and any amendment thereto, and as of the applicable filing date as 
   to the Prospectus and any amendment or supplement thereto, contain an untrue 
   statement of a material fact or omit to state a material fact required to be 
   stated therein or necessary to make the statements therein not misleading; 
   PROVIDED, HOWEVER, that this representation and warranty shall not apply to 
   any statements or omissions made in reliance upon and in conformity with 
   information furnished in writing to the Company by an Underwriter through 
   Goldman, Sachs & Co. expressly for use therein;

      (e) Neither the Company nor any of its subsidiaries has sustained since 
   the date of the latest audited financial statements included or incorporated 
   by reference in the Prospectus any material loss or interference with its 
   business from fire, explosion, flood or other calamity, whether or not 
   covered by insurance, or from any labor dispute or court or governmental 
   action, order or decree, otherwise than as set forth or contemplated in the 
   Prospectus; and, since the respective dates as of which information is given 
   in the Registration Statement and the Prospectus, there has not been any 
   change in the capital stock (other than as a result of the exercise of stock 
   options per issuance of Shares pursuant to the Company's stock option and 
   stock purchase plan described in the Prospectus) or long-term debt (other 
   than in an amount up to $ ______) of the Company or any of its subsidiaries 
   or any material adverse change, or any development involving a prospective 
   material adverse change, in or affecting the general affairs, management, 
   financial position, stockholders' equity or results



   of operations of the Company and its subsidiaries, otherwise than as set 
   forth or contemplated in the Prospectus;

      (f) The Company and its subsidiaries have good and marketable title in 
   fee simple to all real property and good and marketable title to all personal
   property owned by them, in each case free and clear of all liens, 
   encumbrances and defects except such as are described in the Prospectus or 
   such as do not materially affect the value of such property and do not 
   interfere with the use made and proposed to be made of such property by the 
   Company and its subsidiaries; and any real property and buildings held under 
   lease by the Company and its subsidiaries are held by them under valid, 
   subsisting and enforceable leases with such exceptions as are not material 
   and do not interfere with the use made and proposed to be made of such 
   property and buildings by the Company and its subsidiaries;
   
      (g) The Company has been duly incorporated and is validly existing as a 
   corporation in good standing under the laws of the State of Delaware, with 
   power and corporate authority to own its properties and conduct its business 
   as described in the Prospectus, and has been duly qualified as a foreign 
   corporation for the transaction of business and is in good standing under the
   laws of each other jurisdiction in which it owns or leases properties or 
   conducts any business so as to require such qualification, or is subject to 
   no material liability or disability by reason of the failure to be so 
   qualified in any such jurisdiction; and each subsidiary of the Company has 
   been duly incorporated and is validly existing as a corporation in good 
   standing under the laws of its jurisdiction of incorporation;

      (h) The Company has an authorized capitalization as set forth in the 
   Prospectus, and all of the issued shares of capital stock of the Company have
   been duly and validly authorized and issued, are fully paid and 
   non-assessable and conform to the description of the Company's capital stock 
   incorporated by reference into the Prospectus; and all of the issued shares 
   of capital stock of each subsidiary of the Company have been duly and validly
   authorized and issued, are fully paid and non-assessable and (except for 
   directors' qualifying shares and except as set forth in the Prospectus) are 
   owned directly or indirectly by the Company, free and clear of all liens, 
   encumbrances, equities or claims;
   
      (i) The Shares to be issued and sold by the Company to the Underwriters 
   hereunder have been duly and validly authorized and, when issued and 
   delivered against payment therefor as provided herein, will be duly and 
   validly issued and fully paid and non-assessable and will conform to the 
   description of the Stock incorporated by reference into the Prospectus;

      (j) The issue and sale of the Shares by the Company and the compliance 
   by the Company with all of the provisions of this Agreement and the 
   consummation of the transactions herein contemplated will not conflict with 
   or result in a breach or violation of any of the terms or provisions of, or 
   constitute a default under, any indenture, mortgage, deed of trust, loan 
   agreement or other agreement or instrument to which the Company or any of its
   subsidiaries is a party or by which the Company or any of its subsidiaries is
   bound or to



    which any of the property or assets of the Company or any of its 
   subsidiaries is subject except to the extent such conflict, breach or 
   violation would not, individually or in the aggregate, (i) have a material 
   adverse effect on the general affairs, financial position, stockholders' 
   equity, results of operation or prospects of the Company or (ii) affect the 
   validity, performance or consummation of the transactions contemplated by 
   this Agreement (either (i) or (ii) constituting a "Material Adverse Effect"),
   nor will such action result in any violation of the provisions of the 
   Certificate of Incorporation or By-laws of the Company or any statute or any 
   order, rule or regulation of any court or governmental agency or body having 
   jurisdiction over the Company or any of its subsidiaries or any of their 
   properties; and no consent, approval, authorization, order, registration or 
   qualification of or with any such court or governmental agency or body is 
   required for the issue and sale of the Shares or the consummation by the 
   Company of the transactions contemplated by this Agreement, except the 
   registration under the Act of the Shares and such consents, approvals, 
   authorizations, registrations or qualifications as may be required under 
   state securities or Blue Sky laws or by the National Association of 
   Securities Dealers, Inc. (the "NASD") in connection with the purchase and 
   distribution of the Shares by the Underwriters;

      (k) Neither the Company nor any of its subsidiaries is in violation of 
   its Certificate of Incorporation or By-laws or in default in the performance 
   or observance of any material obligation, agreement, covenant or condition 
   contained in any indenture, mortgage, deed of trust, loan agreement, lease or
   other agreement or instrument to which it is a party or by which it or any of
   its properties may be bound;

      (l) The statements incorporated by reference into the Prospectus with 
   respect to "Description of Capital Stock", insofar as they purport to 
   constitute a summary of the terms of the Stock, are accurate, complete and 
   fair;

      (m) Other than as set forth in the Prospectus, there are no legal or 
   governmental proceedings pending to which the Company or any of its 
   subsidiaries is a party or of which any property of the Company or any of its
   subsidiaries is the subject which, if determined adversely to the Company or 
   any of its subsidiaries, would individually or in the aggregate have a 
   material adverse effect on the current or future consolidated financial 
   position, stockholders' equity or results of operations of the Company and 
   its subsidiaries; and, to the best of the Company's knowledge, no such 
   proceedings are threatened or contemplated by governmental authorities or 
   threatened by others;

      (n) The Company is not and, after giving effect to the offering and sale 
   of the Shares, will not be an "investment company" or an entity "controlled"
   by an "investment company", as such terms are defined in the Investment 
   Company Act of 1940, as amended (the "Investment Company Act");
   
      (o) Neither the Company nor any of its affiliates does business with the 
   government of Cuba or with any person or affiliate located in Cuba within the
   meaning of Section 517.075, Florida Statutes; and


   
      (p) Arthur Andersen LLP, who have certified certain financial statements 
   of the Company and its subsidiaries, and Ernst & Young LLP and Arthur 
   Andersen LLP, who have certified certain financial statements of Cooper & 
   Chyan Technology, Inc. and High Level Design Systems, Inc., respectively, are
   each independent public accountants as required by the Act and the rules and 
   regulations of the Commission thereunder.

      (q) The Company owns, or possesses adequate rights to use, all material 
   trademarks, service marks, trade names, trademark registrations, service mark
   registrations, domain names and copyrights necessary for the conduct of its 
   business and has no reason to believe that the conduct of its business will 
   conflict with, and has not received any notice of any claim of conflict with 
   any such rights or others except as would not have a Material Adverse Effect;
   and neither the Company nor any of its subsidiaries have infringed or are   
   infringing any trademarks, services marks, trade names, trademark 
   registrations, service mark registrations, domain names or copyrights, which 
   infringement could reasonably be expected to have a Material Adverse Effect; 

      (r) The Company owns, or possesses adequate rights to use, all material 
   patents necessary for the conduct of its business; no valid Unites States 
   patent is, or to the knowledge of the Company would be, infringed by the 
   activities of the Company, except as would not have a Material Adverse 
   Effect; there are no actions, suits or judicial proceedings pending relating 
   to patents or proprietary information to which the Company is a party or of 
   which any property of the Company is subject, and, to the knowledge of the 
   Company, no actions, suits or judicial proceedings are threatened by 
   governmental authorities or, except as set forth or incorporated by reference
   in the Prospectus others, in each case except as would not have a Material 
   Adverse Effect; except as set forth or incorporated by reference in the 
   Prospectus or as would not have a Material Adverse Effect, the Company is not
   aware of any claim by others that the Company is infringing or otherwise 
   violating the patents or other intellectual property of others and is not 
   aware of any rights of third parties to any of the Company's patent 
   applications, licensed patents or licenses which could affect materially the 
   use thereof by the Company; 

      (s) The Company carries, or is covered by, insurance as is customary 
   for companies similarly situated and engaged in similar businesses in similar
   industries; 

      (t) There are no contracts or other documents which are required to be 
   described in the Prospectus or to be filed or incorporated by reference as 
   exhibits to the Initial Registration Statement by the Act or the Exchange Act
   which are not so filed or incorporated by reference;

      (u) No labor disturbance by the employees of the Company exists or, to 
   the knowledge of the Company, is imminent which might be expected to have a
   material adverse effect on the business, financial condition, results of 
   operations or prospects of the Company; 



      (v) Each of the Forms S-4 relating to the acquisition by the Company of 
   Cooper & Chyan Technology, Inc. and High Level Design Systems, Inc. and each
   of the documents incorporated by reference therein, when they were or are 
   filed with the Commission and when they became or become effective, as the 
   case may be, conformed in all material respects to the requirements of the 
   Act or the Exchange Act, as applicable, and the rules and regulations of the
   Commission thereunder and, none of such documents on the date they were or 
   are filed or were or are declared effective contained an untrue statement of
   a material fact or omitted to state a material fact required to be stated 
   therein or necessary to make the statements therein not misleading; and any 
   further documents so filed and incorporated by reference in such Forms S-4 or
   any further amendment or supplement thereto, when such further documents or 
   Forms S-4 became effective or were or are filed with the Commission, as the 
   case may be, conformed in all material respects to the requirements of the 
   Act or the Exchange Act, as applicable, and the rules and regulations of the
   Commission thereunder and did or will not contain an untrue statement of a 
   material fact or omit to state a material fact required to be stated therein
   or necessary to make the statements therein not misleading; and

      (w) The Company is qualified, or prior to consummation of its acquisition 
   of Cooper & Chyan Technology, Inc. will be, qualified to account for its 
   acquisition of Cooper & Chyan Technology, Inc. as a pooling of interests.

     2. Subject to the terms and conditions herein set forth, (a) the Company 
agrees to issue and sell to each of the Underwriters, and each of the 
Underwriters agrees, severally and not jointly, to purchase from the Company, 
at a purchase price per share of $___________, the number of Firm Shares set 
forth opposite the name of such Underwriter in Schedule I hereto and (b) in 
the event and to the extent that the Underwriters shall exercise the election 
to purchase Optional Shares as provided below, the Company agrees to issue 
and sell to each of the Underwriters, and each of the Underwriters agrees, 
severally and not jointly, to purchase from the Company, at the purchase 
price per share set forth in clause (a) of this Section 2, that portion of 
the number of Optional Shares as to which such election shall have been 
exercised (to be adjusted by you so as to eliminate fractional shares) 
determined by multiplying such number of Optional Shares by a fraction, the 
numerator of which is the maximum number of Optional Shares which such 
Underwriter is entitled to purchase as set forth opposite the name of such 
Underwriter in Schedule I hereto and the denominator of which is the maximum 
number of Optional Shares that all of the Underwriters are entitled to 
purchase hereunder.

     The Company hereby grants to the Underwriters the right to purchase at 
their election up to 750,000 Optional Shares, at the purchase price per share 
set forth in the paragraph above, for the sole purpose of covering 
overallotments in the sale of the Firm Shares.  Any such election to purchase 
Optional Shares may be exercised only by written notice from you to the 
Company, given within a period of 30 calendar days after the date of this 
Agreement,



setting forth the aggregate number of Optional Shares to be purchased and the 
date on which such Optional Shares are to be delivered, as determined by you 
but in no event earlier than the First Time of Delivery (as defined in 
Section 4 hereof) or, unless you and the Company otherwise agree in writing, 
earlier than two or later than ten business days after the date of such 
notice.

     3. Upon the authorization by you of the release of the Firm Shares, the 
several Underwriters propose to offer the Firm Shares for sale upon the terms 
and conditions set forth in the Prospectus.

          4.(a) The Shares to be purchased by each Underwriter hereunder, in 
     definitive form, and in such authorized denominations and registered in 
     such names as Goldman, Sachs & Co. may request upon at least forty-eight
     hours prior notice to the Company shall be delivered by or on behalf of
     the Company to Goldman, Sachs & Co., through the facilities of the 
     Depository Trust Company, for the account of such Underwriter, against 
     payment by or on behalf of such Underwriter of the purchase price 
     therefor by wire transfer, payable to the order of the Company by wire 
     transfer in same day funds.  The Company will cause the certificates 
     representing the Shares to be made available for checking and packaging 
     at least twenty-four hours prior to the Time of Delivery (as defined 
     below) at the office of DTC or its designated custodian (the 
     "Designated Office").  The time and date of such delivery and payment 
     shall be, with respect to the Firm Shares, 9:30 a.m., New York City time, 
     on ___________, 1996 or such other time and date as Goldman, Sachs & Co. 
     and the Company may agree upon in writing, and, with respect to the 
     Optional Shares, 9:30 a.m., New York time, on the date specified by 
     Goldman, Sachs & Co. in the written notice given by Goldman, Sachs & Co.
     of the Underwriters' election to purchase such Optional Shares, or such 
     other time and date as Goldman, Sachs & Co. and the Company may agree 
     upon in writing.  Such time and date for delivery of the Firm Shares is 
     herein called the "First Time of Delivery", such time and date for delivery
     of the Optional Shares, if not the First Time of Delivery, is herein called
     the "Second Time of Delivery", and each such time and date for delivery is 
     herein called a "Time of Delivery".

     (b) The documents to be delivered at each Time of Delivery by or on 
behalf of the parties hereto pursuant to Section 7 hereof, including the 
cross receipt for the Shares and any additional documents requested by the 
Underwriters pursuant to Section 7(j) hereof, will be delivered at the 
offices of Cooley Godward LLP, 3000 El Camino Real, Palo Alto, CA 94306 (the 
"Closing Location"), and the Shares will be delivered at the Designated 
Office, all at such Time of Delivery.  A meeting will be held at the Closing 
Location at 5:00 p.m., New York City time, on the New York 



Business Day next preceding such Time of Delivery, at which meeting the final 
drafts of the documents to be delivered pursuant to the preceding sentence 
will be available for review by the parties hereto.  For the purposes of this 
Section 4, a "New York Business Day" shall mean each Monday, Tuesday, 
Wednesday, Thursday and Friday which is not a day on which banking 
institutions in New York are generally authorized or obligated by law or 
executive order to close.

     5. The Company agrees with each of the Underwriters:

     (a) To prepare the Prospectus in a form approved by you and to file such 
Prospectus pursuant to Rule 424(b) under the Act not later than the 
Commission's close of business on the second business day following the 
execution and delivery of this Agreement, or, if applicable, such earlier 
time as may be required by Rule 430A(a)(3) under the Act; to make no further 
amendment or any supplement to the Registration Statement or Prospectus prior 
to the last Time of Delivery which shall be disapproved by you promptly after 
reasonable notice thereof; to advise you, promptly after it receives notice 
thereof, of the time when any amendment to the Registration Statement has 
been filed or becomes effective or any supplement to the Prospectus or any 
amended Prospectus has been filed and to furnish you with copies thereof; to 
file promptly all reports and any definitive proxy or information statements 
required to be filed by the Company with the Commission pursuant to Section 
13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date of the 
Prospectus and for so long as the delivery of a prospectus is required in 
connection with the offering or sale of the Shares; to advise you, promptly 
after it receives notice thereof, of the issuance by the Commission of any 
stop order or of any order preventing or suspending the use of any 
Preliminary Prospectus or prospectus, of the suspension of the qualification 
of the Shares for offering or sale in any jurisdiction, of the initiation or 
threatening of any proceeding for any such purpose, or of any request by the 
Commission for the amending or supplementing of the Registration Statement or 
Prospectus or for additional information; and, in the event of the issuance 
of any stop order or of any order preventing or suspending the use of any 
Preliminary Prospectus or prospectus or suspending any such qualification, 
promptly to use its best efforts to obtain the withdrawal of such order;

     (b) Promptly from time to time to take such action as you may reasonably 
request to qualify the Shares for offering and sale under the securities laws 
of such jurisdictions as you may request and to comply with such laws so as 
to permit the continuance of sales and dealings therein in such jurisdictions 
for as long as may be necessary to complete the distribution of the Shares, 
provided that in connection therewith the Company shall not be required to 
qualify as a foreign corporation or to file a general consent to service of 
process in any jurisdiction;

     (c) Prior to 12:00 p.m., New York City time, on the New York Business 
Day next succeeding the date of this Agreement and from time to time to 
furnish the Underwriters with copies of the Prospectus in New York City in 
such quantities as you may reasonably request, and, if the delivery of a 
prospectus is required at any time prior to the expiration of nine months 
after the time of issue of the Prospectus in connection with the offering or 
sale of the Shares and if at such time any event shall have occurred as a 
result of which the Prospectus



as then amended or supplemented would include an untrue statement of a 
material fact or omit to state any material fact necessary in order to make 
the statements therein, in the light of the circumstances under which they 
were made when such Prospectus is delivered, not misleading, or, if for any 
other reason it shall be necessary during such period to amend or supplement 
the Prospectus or to file under the Exchange Act any document incorporated by 
reference in the Prospectus in order to comply with the Act or the Exchange 
Act, to notify you and upon your request to file such document and to prepare 
and furnish without charge to each Underwriter and to any dealer in 
securities as many copies as you may from time to time reasonably request of 
an amended Prospectus or a supplement to the Prospectus which will correct 
such statement or omission or effect such compliance, and in case any 
Underwriter is required to deliver a prospectus in connection with sales of 
any of the Shares at any time nine months or more after the time of issue of 
the Prospectus, upon your request but at the expense of such Underwriter, to 
prepare and deliver to such Underwriter as many copies as you may request of 
an amended or supplemented Prospectus complying with Section 10(a)(3) of the 
Act;

     (d) To make generally available to its securityholders as soon as 
practicable, but in any event not later than eighteen months after the 
effective date of the Registration Statement (as defined in Rule 158(c) under 
the Act), an earnings statement of the Company and its subsidiaries (which 
need not be audited) complying with Section 11(a) of the Act and the rules 
and regulations thereunder (including, at the option of the Company, Rule 
158);

     (e) During the period beginning from the date hereof and continuing to 
and including the date 90 days after the date of the Prospectus, not to 
offer, sell, contract to sell or otherwise dispose of, except as provided 
hereunder, any securities of the Company that are substantially similar to 
the Shares, including but not limited to any securities that are convertible 
into or exchangeable for, or that represent the right to receive, Stock or 
any such substantially similar securities (other than in connection with the 
Company's acquisition of Cooper & Chyan Technology, Inc. and High Level 
Design Systems, Inc. as disclosed in the Prospectus, or, if the acquisition 
of High Level Design Systems, Inc. does not occur prior to the Company's 
acquisition of Cooper & Chyan Technology, the issuance and sale in a firm 
underwritten public offering (or in a private placement in which one of the 
Representatives acts as the placement agent, of the number of Shares of Stock 
contemplated to be issued in the acquisition of High Level Design Systems, 
Inc. if necessary to permit the acquisition of Cooper & Chyan Technology to 
qualify for pooling of interests accounting treatment or pursuant to employee 
stock option plans existing on, or upon the conversion or exchange of 
convertible or exchangeable securities outstanding as of, the date of this 
Agreement), without your prior written consent;

     (f) To furnish to its stockholders as soon as practicable after the end 
of each fiscal year an annual report (including a balance sheet and 
statements of income, stockholders' equity and cash flows of the Company and 
its consolidated subsidiaries certified by independent public accountants) 
and, as soon as practicable after the end of each of the first three quarters 
of each fiscal year (beginning with the fiscal quarter ending after the 
effective



date of the Registration Statement), consolidated summary financial 
information of the Company and its subsidiaries for such quarter in 
reasonable detail;

     (g) During a period of five years from the effective date of the 
Registration Statement, to furnish to you copies of all reports or other 
communications (financial or other) furnished to stockholders, and to deliver 
to you (i) as soon as they are available, copies of any reports and financial 
statements furnished to or filed with the Commission or any national 
securities exchange on which any class of securities of the Company is 
listed; and (ii) such additional information concerning the business and 
financial condition of the Company as you may from time to time reasonably 
request (such financial statements to be on a consolidated basis to the 
extent the accounts of the Company and its subsidiaries are consolidated in 
reports furnished to its stockholders generally or to the Commission);

     (h) To use the net proceeds received by it from the sale of the Shares 
pursuant to this Agreement in the manner specified in the Prospectus under 
the caption "Use of Proceeds";

     (i) To use its best efforts to list, subject to notice of issuance, the 
Shares on the New York Stock Exchange (the "Exchange"); and 

     (j) If the Company elects to rely upon Rule 462(b), the Company shall 
file a Rule 462(b) Registration Statement with the Commission in compliance 
with Rule 462(b) by 10:00 p.m., Washington, D.C. time, on the date of this 
Agreement, and the Company shall at the time of filing either pay to the 
Commission the filing fee for the Rule 462(b) Registration Statement or give 
irrevocable instructions for the payment of such fee pursuant to Rule 111(b) 
under the Act.

     6. The Company covenants and agrees with the several Underwriters that 
the Company will pay or cause to be paid the following:  (i) the fees, 
disbursements and expenses of the Company's counsel and accountants in 
connection with the registration of the Shares under the Act and all other 
expenses in connection with the preparation, printing and filing of the 
Registration Statement, any Preliminary Prospectus and the Prospectus and 
amendments and supplements thereto and the mailing and delivering of copies 
thereof to the Underwriters and dealers; (ii) the cost of printing or 
producing any Agreement among Underwriters, this Agreement, the Blue Sky 
Memorandum, closing documents (including any compilations thereof) and any 
other documents in connection with the offering, purchase, sale and delivery 
of the Shares; (iii) all expenses in connection with the qualification of the 
Shares for offering and sale under state securities laws as provided in 
Section 5(b) hereof, including the fees and disbursements of counsel for the 
Underwriters in connection with such qualification and in connection with the 
Blue Sky survey (iv) all fees and expenses in connection with listing the 
Shares on the Exchange; the filing fees incident to, and the fees and 
disbursements of counsel for the Underwriters in connection with, securing 
any required review by the National Association of Securities Dealers, Inc. 
of the terms of the sale of the 



Shares; the cost of preparing stock certificates; the cost and charges of any 
transfer agent or registrar; and all other costs and expenses incident to the 
performance of its obligations hereunder which are not otherwise specifically 
provided for in this Section.  It is understood, however, that, except as 
provided in this Section, and Sections 8 and 11 hereof, the Underwriters will 
pay all of their own costs and expenses, including the fees of their counsel, 
stock transfer taxes on resale of any of the Shares by them, and any 
advertising expenses connected with any offers they may make.

     7. The obligations of the Underwriters hereunder, as to the Shares to be 
delivered at each Time of Delivery, shall be subject, in their discretion, to 
the condition that all representations and warranties and other statements of 
the Company herein are, at and as of such Time of Delivery, true and correct, 
the condition that the Company shall have performed all of its obligations 
hereunder theretofore to be performed, and the following additional 
conditions:

          (a) The Prospectus shall have been filed with the Commission 
     pursuant to Rule 424(b) within the applicable time period prescribed for 
     such filing by the rules and regulations under the Act and in accordance 
     with Section 5(a) hereof; if the Company has elected to rely upon Rule 
     462(b), the Rule 462(b) Registration Statement shall have become effective
     by 10:00 P.M., Washington, D.C. time on the date of this Agreement; no stop
     order suspending the effectiveness of the Registration Statement or any 
     part thereof shall have been issued and no proceeding for that purpose 
     shall have been initiated or threatened by the Commission; and all requests
     for additional information on the part of the Commission shall have been 
     complied with to your reasonable satisfaction;

          (b) Venture Law Group, A Professional Corporation, counsel for the 
     Underwriters, shall have furnished to you such opinion or opinions (a draft
     of each such opinion is attached as Annex III(a) hereto), dated such Time 
     of Delivery, with respect to the matters covered in paragraphs (i) 
     (provided, such opinion may be limited to the Shares), (ii), (vii), (xi),
     (xiii) and (xiv) of subsection (c) below as well as such other related 
     matters as you may reasonably request, and such counsel shall have received
     such papers and information as they may reasonably request to enable them 
     to pass upon such matters;

          (c) Cooley Godward LLP, counsel for the Company, shall have 
     furnished to you their written opinion (a draft of each such opinion is 
     attached as Annex II(b) hereto), dated such Time of Delivery, in form and 
     substance satisfactory to you, to the effect that:

               (i) The Company has been duly incorporated and is validly 
          existing as a corporation in good standing under the laws of the State
          of Delaware, with corporate power and authority to own its properties 
          and conduct its business as described in the Prospects;



              (ii) The Company has the authorized capital stock as set forth in
          the Prospectus under the caption "Capitalization" as of the dates 
          stated therein, and all of the issued and outstanding shares of 
          capital stock of the Company have been duly and validly issued and
          are fully paid and non-assessable.  The Shares have been duly 
          authorized and, upon issuance and delivery against payment therefor
          in accordance with the terms of the Agreement, will be duly and 
          validly issued and fully paid and nonassessable and will conform 
          to the description of the Company's Common Stock incorporated by 
          reference into the Prospectus;

             (iii) The Company has been duly qualified as a foreign 
          corporation for the transaction of business and is in good standing 
          under the laws of each jurisdiction in which it owns or leases 
          properties or conducts any business so as to require such 
          qualification and where any statutory fines or penalties or any 
          corporate disability imposed for failure to qualify would 
          materially and adversely affect the Company, its assets, financial
          condition or operations;

              (iv) Each material subsidiary of the Company is listed on 
          Exhibit A hereto (the "Material Subsidiaries") and has been duly 
          incorporated and is validly existing as a corporation in good 
          standing under the laws of its jurisdiction of incorporation; all
          of the issued and outstanding shares of capital stock of each such 
          Material Subsidiary have been duly and validly authorized and issued,
          are fully paid and non-assessable, and are owned of record, directly
          or indirectly by the Company (except for director's qualifying 
          shares); to the best of such counsel's knowledge, the Company owns 
          such shares free and clear of all material liens, encumbrances, 
          equities or claims;

               (v) To the best of such counsel's knowledge and other than as 
          set forth in the Prospectus, there are no legal or governmental 
          proceedings pending to which the Company or any of its subsidiaries
          is a party or of which any property of the Company or any of its 
          subsidiaries, would individually or in the aggregate have a material
          adverse effect on the assets, financial condition or operations of 
          the Company and its subsidiaries taken as a whole; and, to the best 
          of such counsel's knowledge, no such proceedings have been overtly
          threatened against the Company or any of its subsidiaries by any 
          governmental authorities or others;

              (vi) This Agreement has been duly authorized, executed and 
          delivered by the Company;

             (vii) The issuance and sale of the Shares, the compliance by the 
          Company with all of the provisions of this Agreement and the 
          consummation of the transactions herein contemplated do not constitute
          and will not result in a breach or violation of any of the terms or 
          provisions of, or constitute a default under, any material agreement 
          or instrument listed as an exhibit to the Registration Statement, nor
          will such action result in any violation of the provisions of: (a) the
          Certificate of



          Incorporation or Bylaws of the Company; (b) any governmental statute,
          rule or regulation applicable to the Company or any of its 
          subsidiaries (except that counsel need not express any opinion with 
          respect to antifraud rules or regulations, state securities or "blue 
          sky" statutes, or the requirements of the National Association of 
          Securities Dealers, Inc. (the "NASD")); or (c) any order, writ, 
          judgment, decree, determination or award that has been entered against
          the Company or any of its subsidiaries and of which we are aware, 
          the violation or contravention of which would materially and adversely
          affect the Company and its subsidiaries, taken as a whole, and their 
          assets, financial condition or operations, taken as a whole.

            (viii) No consent, approval, authorization, order, registration 
          or qualification of or with any such court or governmental agency or
          body is required for the issue and sale of the Shares or the 
          consummation by the Company of the transactions contemplated by this
          Agreement, except the registration of the Shares under the Act, and 
          such consents, approvals, authorizations or orders of, and filings, 
          registrations or qualifications as may be required by the NASD or 
          under state securities or Blue Sky laws in connections with the 
          purchase and distribution of the Shares by the Underwriters;

              (ix) To the best of our knowledge, neither the Company nor any of 
          its subsidiaries is in violation of its Certificate of Incorporation 
          or By-laws;

               (x) The description of the Company's capital stock incorporated 
          by reference in the Prospectus insofar as it purports to constitute a
          summary of matters of laws or legal conclusions is, in all material 
          respects, accurate;

              (xi) The Company is not an "investment company" as such term is 
          defined in the Investment Company Act;

             (xii) The documents incorporated by reference in the Prospectus or
          any further amendment or supplement thereto made by the Company 
          prior to such Time of Delivery (other than the financial statements 
          and related schedules therein and financial and statistical data 
          derived therefrom as to which such counsel need express no opinion),
          when they became effective or were filed with the Commission, as the 
          case may be, complied as to form in all material respects with the 
          requirements of the Act or the Exchange Act, as applicable, and the
          rules and regulations of the Commission thereunder;

            (xiii) The Registration Statement and the Prospectus and any further
          amendments and supplements thereto made by the Company prior to 
          such Time of Delivery (other than the financial statements and related
          schedules therein and financial and statistical data derived therefrom
          as to which such counsel need express no opinion) comply as to form in
          all material respects with the requirements of the Act and the rules
          and regulations thereunder;


          Counsel rendering the foregoing opinion may rely on questions 
     of law not involving the laws of the United States of the States of 
     California and Delaware, upon opinions of local counsel, and in respect 
     of matters of fact upon certificates of officers of the Company.

          In addition to the matters set forth above, counsel rendering the 
     foregoing opinion shall also include a statement to the effect that while 
     they have not independently verified, and accordingly, are not 
     confirming and assume no responsibility for the accuracy or 
     completeness of the statements contained or incorporated by reference in 
     the Registration Statement or the Prospectus (except as set forth in 
     paragraph (x) above), nothing has come to the attention of such counsel 
     that has caused such counsel to believe that (a) as of the effective date 
     of the Registration Statement, the Registration Statement (other than the 
     financial statements and related schedules and other financial data 
     included therein, as to which such counsel need express no opinion) 
     contained an untrue statement of a material fact or omitted to state a 
     material fact required to be stated therein or necessary to make the 
     statements therein not misleading or (b) as of its date and the date 
     hereof, the Prospectus (other than the financial statements and related 
     schedules and other financial data included therein, as to which such 
     counsel need express no opinion) contained or contains an untrue 
     statement of a material fact or omitted or omits to state a material fact 
     required to be stated therein or necessary to make the statements therein, 
     in light of the circumstances under which they were made, not 
     misleading.  In addition, counsel shall state that they do not know of any 
     amendment to the Registration Statement required to be filed or of any 
     contract or documents of a character required to be filed as an exhibit to 
     the Registration Statement or required to be incorporated by reference 
     into the Prospectus or required to be described in the Registration 
     Statement or the Prospectus which are not filed or incorporated by 
     reference or described as required.

     (d) On the date of the Prospectus at a time prior to the execution of 
this Agreement, at 9:30 a.m., New York City time, on the effective date of 
any post-effective amendment to the Registration Statement filed subsequent 
to the date of this Agreement and also at each Time of Delivery, Arthur 
Andersen LLP shall have furnished to you a letter or letters, dated the 
respective dates of delivery thereof, in form and substance satisfactory to 
you, to the effect set forth in Annex I(a) hereto; with respect to the 
Company and Ernst & Young LLP and Arthur Andersen LLP each shall have 
furnished to you a letter or letters, dated the respective dates of delivery 
thereof



in form and substance satisfactory to you, to the effect set forth in Annex 
I(b) and Annex I(c) hereto, with respect to Cooper & Chyan Technology, Inc. 
and High Level Design Systems, Inc., respectively (the executed copies of 
each letter delivered prior to the execution of this Agreement are attached 
as Annexes I(a)(i), I(b)(i) and I(c)(i) hereto, and a draft of the form of 
each letter to be delivered on the effective date of any post-effective 
amendment to the Registration Statement and as of each Time of Delivery and 
attached as Annexes I(a)(ii), I(b)(ii) and I(c)(ii) hereto);

     (e)(i) Neither the Company nor any of its subsidiaries shall have 
sustained since the date of the latest audited financial statements included 
or incorporated by reference in the Prospectus any loss or interference with 
its business from fire, explosion, flood or other calamity, whether or not 
covered by insurance, or from any labor dispute or court or governmental 
action, order or decree, otherwise than as set forth or contemplated in the 
Prospectus, and (ii) since the respective dates as of which information is 
given in the Prospectus there shall not have been any change in the capital 
stock or long-term debt of the Company or any of its subsidiaries or any 
change, or any development involving a prospective change, in or affecting 
the general affairs, management, financial position, stockholders' equity or 
results of operations of the Company and its subsidiaries, otherwise than as 
set forth or contemplated in the Prospectus, the effect of which, in any such 
case described in Clause (i) or (ii), is in the judgment of the 
Representatives so material and adverse as to make it impracticable or 
inadvisable to proceed with the public offering or the delivery of the Shares 
being delivered at such Time of Delivery on the terms and in the manner 
contemplated in the Prospectus;

     (f) On or after the date hereof there shall not have occurred any of the 
following:  (i) a suspension or material limitation in trading in securities 
generally on the New York Stock Exchange; (ii) a suspension or material 
limitation in trading in the Company's securities on the New York Stock 
Exchange; (iii) a general moratorium on commercial banking activities 
declared by either Federal or New York or California State authorities; or 
(iv) the outbreak or escalation of hostilities involving the United States or 
the declaration by the United States of a national emergency or war, if the 
effect of any such event specified in this Clause (iv) in the judgment of the 
Representatives makes it impracticable or inadvisable to proceed with the 
public offering or the delivery of the Shares being delivered at such Time of 
Delivery on the terms and in the manner contemplated in the Prospectus;

     (g) The Shares to be sold at such Time of Delivery shall have been duly 
listed, subject to notice of issuance, on the Exchange

     (h) The Company has obtained and delivered to the Underwriters executed 
copies of an agreement from all executive officers and directors of the 
Company, substantially to the effect set forth in Subsection 5(e) hereof in 
form and substance satisfactory to you; and

     (i) The Company shall have furnished or caused to be furnished to you at 
such Time of Delivery certificates of officers of the Company satisfactory to 
you as to the accuracy of the representations and warranties of the Company 
herein at and as of such Time of



Delivery, as to the performance by the Company of all of its obligations 
hereunder to be performed at or prior to such Time of Delivery, as to the 
matters set forth in subsections (a) and (e) of this Section and as to such 
other matters as you may reasonably request.

     8.(a)  The Company will indemnify and hold harmless each Underwriter 
against any losses, claims, damages or liabilities, joint or several, to 
which such Underwriter may become subject, under the Act or otherwise, 
insofar as such losses, claims, damages or liabilities (or actions in respect 
thereof) arise out of or are based upon an untrue statement or alleged untrue 
statement of a material fact contained in any Preliminary Prospectus, the 
Registration Statement or the Prospectus, or any amendment or supplement 
thereto, or arise out of or are based upon the omission or alleged omission 
to state therein a material fact required to be stated therein or necessary 
to make the statements therein not misleading, and will reimburse each 
Underwriter for any legal or other expenses reasonably incurred by such 
Underwriter in connection with investigating or defending any such action or 
claim as such expenses are incurred; PROVIDED, HOWEVER, that the Company 
shall not be liable in any such case to the extent that any such loss, claim, 
damage or liability arises out of or is based upon an untrue statement or 
alleged untrue statement or omission or alleged omission made in any 
Preliminary Prospectus, the Registration Statement or the Prospectus or any 
such amendment or supplement in reliance upon and in conformity with written 
information furnished to the Company by any Underwriter through Goldman, 
Sachs & Co. expressly for use therein.

     (b) Each Underwriter will indemnify and hold harmless the Company 
against any losses, claims, damages or liabilities to which the Company may 
become subject, under the Act or otherwise, insofar as such losses, claims, 
damages or liabilities (or actions in respect thereof) arise out of or are 
based upon an untrue statement or alleged untrue statement of a material fact 
contained in any Preliminary Prospectus, the Registration Statement or the 
Prospectus, or any amendment or supplement thereto, or arise out of or are 
based upon the omission or alleged omission to state therein a material fact 
required to be stated therein or necessary to make the statements therein not 
misleading, in each case to the extent, but only to the extent, that such 
untrue statement or alleged untrue statement or omission or alleged omission 
was made in any Preliminary Prospectus, the Registration Statement or the 
Prospectus or any such amendment or supplement in reliance upon and in 
conformity with written information furnished to the Company by such 
Underwriter through Goldman, Sachs & Co. expressly for use therein; and will 
reimburse the Company for any legal or other expenses reasonably incurred by 
the Company in connection with investigating or defending any such action or 
claim as such expenses are incurred.

     (c) Promptly after receipt by an indemnified party under subsection (a) 
or (b) above of notice of the commencement of any action, such indemnified 
party shall, if a claim in respect thereof is to be made against the 
indemnifying party under such subsection, notify the indemnifying party in 
writing of the commencement thereof; but the omission so to notify the 
indemnifying party shall not relieve it from any liability which it may have 
to any indemnified party otherwise than under such subsection.  In case any 
such action shall be brought against any indemnified party and it shall 
notify the indemnifying party of the commencement



thereof, the indemnifying party shall be entitled to participate therein and, 
to the extent that it shall wish, jointly with any other indemnifying party 
similarly notified, to assume the defense thereof, with counsel satisfactory 
to such indemnified party (who shall not, except with the consent of the 
indemnified party, be counsel to the indemnifying party), and, after notice 
from the indemnifying party to such indemnified party of its election so to 
assume the defense thereof, the indemnifying party shall not be liable to 
such indemnified party under such subsection for any legal expenses of other 
counsel or any other expenses, in each case subsequently incurred by such 
indemnified party, in connection with the defense thereof other than 
reasonable costs of investigation.  No indemnifying party shall, without the 
written consent of the indemnified party, effect the settlement or compromise 
of, or consent to the entry of any judgment with respect to, any pending or 
threatened action or claim in respect of which indemnification or 
contribution may be sought hereunder (whether or not the indemnified party is 
an actual or potential party to such action or claim) unless such settlement, 
compromise or judgment (i) includes an unconditional release of the 
indemnified party from all liability arising out of such action or claim and 
(ii) does not include a statement as to or an admission of fault, culpability 
or a failure to act, by or on behalf of any indemnified party.

     (d) If the indemnification provided for in this Section 8 is unavailable 
to or insufficient to hold harmless an indemnified party under subsection (a) 
or (b) above in respect of any losses, claims, damages or liabilities (or 
actions in respect thereof) referred to therein, then each indemnifying party 
shall contribute to the amount paid or payable by such indemnified party as a 
result of such losses, claims, damages or liabilities (or actions in respect 
thereof) in such proportion as is appropriate to reflect the relative 
benefits received by the Company on the one hand and the Underwriters on the 
other from the offering of the Shares.  If, however, the allocation provided 
by the immediately preceding sentence is not permitted by applicable law or 
if the indemnified party failed to give the notice required under subsection 
(c) above, then each indemnifying party shall contribute to such amount paid 
or payable by such indemnified party in such proportion as is appropriate to 
reflect not only such relative benefits but also the relative fault of the 
Company on the one hand and the Underwriters on the other in connection with 
the statements or omissions which resulted in such losses, claims, damages or 
liabilities (or actions in respect thereof), as well as any other relevant 
equitable considerations.  The relative benefits received by the Company on 
the one hand and the Underwriters on the other shall be deemed to be in the 
same proportion as the total net proceeds from the offering (before deducting 
expenses) received by the Company bear to the total underwriting discounts 
and commissions received by the Underwriters, in each case as set forth in 
the table on the cover page of the Prospectus.  The relative fault shall be 
determined by reference to, among other things, whether the untrue or alleged 
untrue statement of a material fact or the omission or alleged omission to 
state a material fact relates to information supplied by the Company on the 
one hand or the Underwriters on the other and the parties' relative intent, 
knowledge, access to information and opportunity to correct or prevent such 
statement or omission.  The Company and the Underwriters agree that it would 
not be just and equitable if contributions pursuant to this subsection (d) 
were determined by PRO RATA allocation (even if the Underwriters were treated 
as one entity for such



purpose) or by any other method of allocation which does not take account of 
the equitable considerations referred to above in this subsection (d).  The 
amount paid or payable by an indemnified party as a result of the losses, 
claims, damages or liabilities (or actions in respect thereof) referred to 
above in this subsection (d) shall be deemed to include any legal or other 
expenses reasonably incurred by such indemnified party in connection with 
investigating or defending any such action or claim.  Notwithstanding the 
provisions of this subsection (d), no Underwriter shall be required to 
contribute any amount in excess of the amount by which the total price at 
which the Shares underwritten by it and distributed to the public were 
offered to the public exceeds the amount of any damages which such 
Underwriter has otherwise been required to pay by reason of such untrue or 
alleged untrue statement or omission or alleged omission.  No person guilty 
of fraudulent misrepresentation (within the meaning of Section 11(f) of the 
Act) shall be entitled to contribution from any person who was not guilty of 
such fraudulent misrepresentation.  The Underwriters' obligations in this 
subsection (d) to contribute are several in proportion to their respective 
underwriting obligations and not joint.

     (e) The obligations of the Company under this Section 8 shall be in 
addition to any liability which the Company may otherwise have and shall 
extend, upon the same terms and conditions, to each person, if any, who 
controls any Underwriter within the meaning of the Act; and the obligations 
of the Underwriters under this Section 8 shall be in addition to any 
liability which the respective Underwriters may otherwise have and shall 
extend, upon the same terms and conditions, to each officer and director of 
the Company and to each person, if any, who controls the Company within the 
meaning of the Act.

     9.(a) If any Underwriter shall default in its obligation to purchase the 
Shares which it has agreed to purchase hereunder at a Time of Delivery, you 
may in your discretion arrange for you or another party or other parties to 
purchase such Shares on the terms contained herein.  If within thirty-six 
hours after such default by any Underwriter you do not arrange for the 
purchase of such Shares, then the Company shall be entitled to a further 
period of thirty-six hours within which to procure another party or other 
parties satisfactory to you to purchase such Shares on such terms.  In the 
event that, within the respective prescribed periods, you notify the Company 
that you have so arranged for the purchase of such Shares, or the Company 
notifies you that it has so arranged for the purchase of such Shares, you or 
the Company shall have the right to postpone such Time of Delivery for a 
period of not more than seven days, in order to effect whatever changes may 
thereby be made necessary in the Registration Statement or the Prospectus, or 
in any other documents or arrangements, and the Company agrees to file 
promptly any amendments to the Registration Statement or the Prospectus which 
in your opinion may thereby be made necessary. The term "Underwriter" as used 
in this Agreement shall include any person substituted under this Section 
with like effect as if such person had originally been a party to this 
Agreement with respect to such Shares.

     (b) If, after giving effect to any arrangements for the purchase of the 
Shares of a defaulting Underwriter or Underwriters by you and the Company as 
provided in subsection (a) above, the aggregate number of such Shares which 
remains unpurchased does not



exceed one-eleventh of the aggregate number of all the Shares to be purchased 
at such Time of Delivery, then the Company shall have the right to require 
each non-defaulting Underwriter to purchase the number of shares which such 
Underwriter agreed to purchase hereunder at such Time of Delivery and, in 
addition, to require each non-defaulting Underwriter to purchase its pro rata 
share (based on the number of Shares which such Underwriter agreed to 
purchase hereunder) of the Shares of such defaulting Underwriter or 
Underwriters for which such arrangements have not been made; but nothing 
herein shall relieve a defaulting Underwriter from liability for its default.

     (c) If, after giving effect to any arrangements for the purchase of the 
Shares of a defaulting Underwriter or Underwriters by you and the Company as 
provided in subsection (a) above, the aggregate number of such Shares which 
remains unpurchased exceeds one-eleventh of the aggregate number of all the 
Shares to be purchased at such Time of Delivery, or if the Company shall not 
exercise the right described in subsection (b) above to require 
non-defaulting Underwriters to purchase Shares of a defaulting Underwriter or 
Underwriters, then this Agreement (or, with respect to the Second Time of 
Delivery, the obligations of the Underwriters to purchase and of the Company 
to sell the Optional Shares) shall thereupon terminate, without liability on 
the part of any non-defaulting Underwriter or the Company, except for the 
expenses to be borne by the Company and the Underwriters as provided in 
Section 6 hereof and the indemnity and contribution agreements in Section 8 
hereof; but nothing herein shall relieve a defaulting Underwriter from 
liability for its default.

     10. The respective indemnities, agreements, representations, warranties 
and other statements of the Company and the several Underwriters, as set 
forth in this Agreement or made by or on behalf of them, respectively, 
pursuant to this Agreement, shall remain in full force and effect, regardless 
of any investigation (or any statement as to the results thereof) made by or 
on behalf of any Underwriter or any controlling person of any Underwriter, or 
the Company, or any officer or director or controlling person of the Company, 
and shall survive delivery of and payment for the Shares.

     11. If this Agreement shall be terminated pursuant to Section 9 hereof, 
the Company shall not then be under any liability to any Underwriter except 
as provided in Sections 6 and 8 hereof; but, if for any other reason, any 
Shares are not delivered by or on behalf of the Company as provided herein, 
the Company will reimburse the Underwriters through you for all out-of-pocket 
expenses approved in writing by you, including fees and disbursements of 
counsel, reasonably incurred by the Underwriters in making preparations for 
the purchase, sale and delivery of the Shares not so delivered, but the 
Company shall then be under no further liability to any Underwriter except as 
provided in Sections 6 and 8 hereof.

     12. In all dealings hereunder, you shall act on behalf of each of the 
Underwriters, and the parties hereto shall be entitled to act and rely upon 
any statement, request, notice or



agreement on behalf of any Underwriter made or given by you jointly or by 
Goldman, Sachs & Co. on behalf of you as the Representatives.

     All statements, requests, notices and agreements hereunder shall be in 
writing, and if to the Underwriters shall be delivered or sent by mail, telex 
or facsimile transmission to you as the representatives in care of Goldman, 
Sachs & Co., 85 Broad Street, New York, New York  10004, Attention: 
Registration Department; and if to the Company shall be delivered or sent by 
mail to the address of the Company set forth in the Registration Statement, 
Attention: General Counsel; provided, however, that any notice to an 
Underwriter pursuant to Section 8(c) hereof shall be delivered or sent by 
mail, telex or facsimile transmission to such Underwriter at its address set 
forth in its Underwriters' Questionnaire, or telex constituting such 
Questionnaire, which address will be supplied to the Company by you upon 
request.  Any such statements, requests, notices or agreements shall take 
effect upon receipt thereof.

     13. This Agreement shall be binding upon, and inure solely to the 
benefit of, the Underwriters, the Company and, to the extent provided in 
Sections 8 and 10 hereof, the officers and directors of the Company and each 
person who controls the Company or any Underwriter, and their respective 
heirs, executors, administrators, successors and assigns, and no other person 
shall acquire or have any right under or by virtue of this Agreement. No 
purchaser of any of the Shares from any Underwriter shall be deemed a 
successor or assign by reason merely of such purchase.

     14. Time shall be of the essence of this Agreement.  As used herein, the 
term "business day" shall mean any day when the Commission's office in 
Washington, D.C.  is open for business.

     15. This Agreement shall be governed by and construed in accordance with 
the laws of the State of New York.

     16. This Agreement may be executed by any one or more of the parties 
hereto in any number of counterparts, each of which shall be deemed to be an 
original, but all such counterparts shall together constitute one and the 
same instrument.



If the foregoing is in accordance with your understanding, please sign and 
return to us one executed counterpart of this Agreement for the Company, each 
of the Representatives and each counsel, and upon the acceptance hereof by 
you, on behalf of each of the Underwriters, this letter and such acceptance 
hereof shall constitute a binding agreement between each of the Underwriters 
and the Company.  It is understood that your acceptance of this letter on 
behalf of each of the Underwriters is pursuant to the authority set forth in 
a form of Agreement among Underwriters, the form of which shall be submitted 
to the Company for examination upon request, but without warranty on your 
part as to the authority of the signers thereof.

                                   Very truly yours,

                                   CADENCE DESIGN SYSTEMS, INC.

                                   By:

                                   Name:
                                   Title:
Accepted as of the date hereof:

GOLDMAN, SACHS & CO.
MORGAN STANLEY & CO. INCORPORATED

BY:
        (Goldman, Sachs & Co.)
On behalf of each of the Underwriters



                                        SCHEDULE I

                                                         NUMBER OF OPTIONAL
                                                             SHARES TO BE
                                       TOTAL NUMBER          PURCHASED IF
                                            OF
                                       FIRM SHARES          MAXIMUM OPTION
         UNDERWRITER                  TO BE PURCHASED          EXERCISED
         -----------                  ---------------    ------------------
Goldman, Sachs & Co.
Morgan Stanley & Co. Incorporated
[NAMES OF OTHER UNDERWRITERS]
                                          ---------            -------
Total                                     5,000,000            750,000
                                          ---------            -------
                                          ---------            -------



                                     ANNEX I

     Pursuant to Section 7(d) of the Underwriting Agreement, the accountants 
shall furnish letters to the Underwriters to the effect that:

         (i) They are independent certified public accountants with respect to 
    the Company and its subsidiaries within the meaning of the Act and the 
    applicable published rules and regulations thereunder;

        (ii) In their opinion, the financial statements and any 
    supplementary financial information and schedules (and, if applicable, 
    financial forecasts and/or pro forma financial information) examined by 
    them and included or incorporated by reference in the Registration Statement
    or the Prospectus comply as to form in all material respects with the 
    applicable accounting requirements of the Act or the Exchange Act, as 
    applicable, and the related published rules and regulations thereunder; and,
    if applicable, they have made a review in accordance with standards 
    established by the American Institute of Certified Public Accountants of the
    consolidated interim financial statements, selected financial data, pro 
    forma financial information and/or condensed financial statements derived 
    from financial statements of the Company for the periods specified in such 
    letter, as indicated in their reports thereon, copies of which have been 
    furnished to the representatives of the Underwriters (the "Representatives")
    and are attached hereto;

       (iii) They have made a review in accordance with standards established 
    by the American Institute of Certified Public Accountants of the unaudited 
    condensed consolidated statements of income, consolidated balance sheets and
    consolidated statements of cash flows included in the Prospectus and/or 
    included in the Company's quarterly report on Form 10-Q incorporated by 
    reference into the Prospectus as indicated in their reports thereon copies 
    of which are attached hereto; and on the basis of specified procedures 
    including inquiries of officials of the Company who have responsibility for 
    financial and accounting matters regarding whether the unaudited condensed 
    consolidated financial statements referred to in paragraph (vi)(A)(i) below
    comply as to form in all material respects with the applicable accounting 
    requirements of the Act and the Exchange Act and the related published rules
    and regulations, nothing came to their attention that caused them to believe
    that the unaudited condensed consolidated financial statements do not comply
    as to form in all material respects with the applicable accounting 
    requirements of the Act and the Exchange Act and the related published rules
    and regulations;

        (iv) The unaudited selected financial information with respect to the 
    consolidated results of operations and financial position of the Company for
    the five most recent fiscal years included in the Prospectus and included or
    incorporated by reference in Item 6 of the Company's Annual Report on Form 
    10-K for the most recent fiscal year agrees with the corresponding amounts 
    (after restatement where applicable) in the audited consolidated 



    financial statements for such five fiscal years which were included or 
    incorporated by reference in the Company's Annual Reports on Form 10-K 
    for such fiscal years;

         (v) They have compared the information in the Prospectus under 
    selected captions with the disclosure requirements of Regulation S-K and on
    the basis of limited procedures specified in such letter nothing came to 
    their attention as a result of the foregoing procedures that caused them to 
    believe that this information does not conform in all material respects with
    the disclosure requirements of Items 301, 302, 402 and 503(d), respectively,
    of Regulation S-K;

        (vi) On the basis of limited procedures, not constituting an 
    examination in accordance with generally accepted auditing standards, 
    consisting of a reading of the unaudited financial statements and other 
    information referred to below, a reading of the latest available interim 
    financial statements of the Company and its subsidiaries, inspection of the
    minute books of the Company and its subsidiaries since the date of the 
    latest audited financial statements included or incorporated by reference 
    in the Prospectus, inquiries of officials of the Company and its 
    subsidiaries responsible for financial and accounting matters and such other
    inquiries and procedures as may be specified in such letter, nothing came 
    to their attention that caused them to believe that:

            (A)(i) the unaudited condensed consolidated statements of income, 
       consolidated balance sheets and consolidated statements of cash flows 
       included in the Prospectus and/or included or incorporated by reference
       in the Company's Quarterly Reports on Form 10-Q incorporated by 
       reference in the Prospectus do not comply as to form in all material 
       respects with the applicable accounting requirements of the Exchange 
       Act and the related published rules and regulations, or (ii) any material
       modifications should be made to the unaudited condensed consolidated 
       statements of income, consolidated balance sheets and consolidated 
       statements of cash flows included in the Prospectus or included in the 
       Company's Quarterly Reports on Form 10-Q incorporated by reference in 
       the Prospectus, for them to be in conformity with generally accepted 
       accounting principles;

            (B) any other unaudited income statement data and balance sheet 
        items included in the Prospectus do not agree with the corresponding 
        items in the unaudited consolidated financial statements from which such
        data and items were derived, and any such unaudited data and items 
        were not determined on a basis substantially consistent with the basis 
        for the corresponding amounts in the audited consolidated financial 
        statements included or incorporated by reference in the Company's 
        Annual Report on Form 10-K for the most recent fiscal year;
        
            (C) the unaudited financial statements which were not included in 
        the Prospectus but from which were derived the unaudited condensed 
        financial statements referred to in Clause (A) and any unaudited income
        statement data and balance sheet items included in the Prospectus and 
        referred to in Clause (B) were



        not determined on a basis substantially consistent with the basis 
        for the audited financial statements included or incorporated 
        by reference in the Company's Annual Report on Form 10-K
        for the most recent fiscal year;

            (D) any unaudited pro forma consolidated condensed financial 
        statements included or incorporated by reference in the Prospectus do 
        not comply as to form in all material respects with the applicable 
        accounting requirements of the Act and the published rules and 
        regulations thereunder or the pro forma adjustments have not been 
        properly applied to the historical amounts in the compilation of those 
        statements;

            (E) as of a specified date not more than five days prior to the date
        of such letter, there have been any changes in the consolidated capital
        stock (other than issuances of capital stock upon exercise of options 
        and stock appreciation rights, upon earn-outs of performance shares and
        upon conversions of convertible securities, in each case which were 
        outstanding on the date of the latest balance sheet included or 
        incorporated by reference in the Prospectus) or any increase in the 
        consolidated long-term debt of the Company and its subsidiaries, or any
        decreases in consolidated net current assets or stockholders' equity or
        other items specified by the Representatives, or any increases in any 
        items specified by the Representatives, in each case as compared with 
        amounts shown in the latest balance sheet included or incorporated by 
        reference in the Prospectus, except in each case for changes, increases
        or decreases which the Prospectus discloses have occurred or may 
        occur or which are described in such letter; and

            (F) for the period from the date of the latest financial statements
        included or incorporated by reference in the Prospectus to the specified
        date referred to in Clause (E) there were any decreases in consolidated
        net revenues or operating profit or the total or per share amounts of
        consolidated net income or other items specified by the Representatives,
        or any increases in any items specified by the Representatives, in each
        case as compared with the comparable period of the preceding year and
        with any other period of corresponding length specified by the
        Representatives, except in each case for increases or decreases which
        the Prospectus discloses have occurred or may occur or which are
        described in such letter; and

      (vii) In addition to the examination referred to in their report(s) 
    included or incorporated by reference in the Prospectus and the limited 
    procedures, inspection of minute books, inquiries and other procedures 
    referred to in paragraphs (iii) and (vi) above, they have carried out 
    certain specified procedures, not constituting an examination in 
    accordance with generally accepted auditing standards, with respect to 
    certain amounts, percentages and financial information specified by the 
    Representatives which are derived from the general accounting records of 
    the Company and its subsidiaries, which appear in the Prospectus 
    (excluding documents incorporated by reference) or in Part II of, or in
    exhibits and schedules to, the Registration



    Statement specified by the Representatives or in documents incorporated
    by reference in the Prospectus specified by the Representatives, and have 
    compared certain of such amounts, percentages and financial information 
    with the accounting records of the Company and its subsidiaries and have 
    found them to be in agreement.