content: <PAGE>
   
                         SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C.  20549
  
                                      FORM 8-K
  
                                   CURRENT REPORT
  
       Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
  
  
  Date of Report (Date of earliest event reported):     February 28, 1997
                                                        --------------------------
  
                                SUMMIT DESIGN, INC.
  --------------------------------------------------------------------------------
               (Exact name of registrant as specified in its charter)
   
   Delaware                          0-20923                   93-1137888
  --------------------------------------------------------------------------------
  (State or other                  (Commission                (IRS Employer
  jurisdiction of                  File Number)           Identification Number)
  incorporation)
   
                   9305 S.W. GEMINI DRIVE, BEAVERTON, OREGON          97008
  --------------------------------------------------------------------------------
                    (Address of principal executive offices)        (Zip Code)
   
  Registrant's telephone number, including area code:  (503) 643-9281
                                                       ---------------------------
                                        N/A
  --------------------------------------------------------------------------------
           (Former name or former address, if changed since last report)
  <PAGE>
   
  ITEM 2.   ACQUISITION OR DISPOSITION OF ASSETS.
            ------------------------------------ 
  
       On February 28, 1997 (the "Closing Date"), pursuant to an Agreement and
  Plan of Reorganization dated as of February 17, 1997 (the "Reorganization
  Agreement") among Summit Design, Inc., a Delaware corporation ("Summit"), NYE
  Acquisition, Inc., a California corporation and a wholly-owned subsidiary of
  Summit ("Merger Sub"), and TriQuest Design Automation, Inc., a California
  corporation ("TriQuest"), Summit acquired TriQuest by means of a merger (the
  "Merger") of Merger Sub into TriQuest, with TriQuest remaining as the surviving
  corporation in the Merger.  As a result of the Merger, TriQuest became a wholly-
  owned subsidiary of Summit. Merger Sub was formed solely for the purpose of
  effecting the Merger.  Summit is a leading provider of graphical design entry
  and verification software tools and design to test software tools. TriQuest
  develops hardware description language analysis and optimization tools for the
  design of high performance, deep submicron integrated circuits.
  
       Pursuant to the Reorganization Agreement, an aggregate of 775,000 shares of
  Summit Common Stock were issued or reserved for issuance in exchange for (i) all
  of the issued and outstanding capital stock of TriQuest and (ii) all unexpired
  and unexercised options to acquire capital stock of TriQuest.  Each outstanding
  share of TriQuest capital stock was converted into the right to receive a number
  of shares of Summit Common Stock equal to 775,000 divided by the sum of (i) the
  total number of shares of TriQuest capital stock outstanding on the Closing
  Date, and (ii) the total number of shares of TriQuest capital stock subject to
  unexpired and unexercised options to purchase TriQuest capital stock outstanding
  on the Closing Date (the "Exchange Ratio").  All options to purchase TriQuest
  capital stock outstanding immediately prior to the Merger were assumed by
  Summit.  Each such option became exercisable for that number of whole shares of
  Summit Common Stock equal to the product of the number of shares of TriQuest
  capital stock subject to such option multiplied by the Exchange Ratio, with
  cash, less the applicable exercise price, being payable for any fraction of a
  share of Summit Common Stock.  The per share exercise price of each assumed
  option is equal to the quotient determined by dividing the exercise price per
  share of TriQuest capital stock subject to such option immediately prior to the
  Merger by the Exchange Ratio, rounded up to the nearest whole cent.
  
       The consideration paid by Summit for the outstanding capital stock of
  TriQuest pursuant to the Reorganization Agreement was determined pursuant to
  arms' length negotiations and took into account various factors concerning the
  valuation of the business of TriQuest.
  
  ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS.
            --------------------------------- 
  
       (a)  Financial Statements of TriQuest
            --------------------------------
  
            The Financial Information required to be filed pursuant to Item 7(a)
  of Form 8-K was not available at the time of filing of this Current Report on
  Form 8-K and will be filed on a Form 8-K/A as soon as practicable, but in no
  event later than 60 days after the date this Form 8-K is required to be filed.
  
  
       (b)  Pro Forma Financial Information.
            ------------------------------- 
  
            The Pro Forma Financial Information required to be filed pursuant to
  Item 7(b) of Form 8-K was not available at the time of filing of this Current
  Report on Form 8-K and will be filed on a Form 8-K/A as soon as practicable, but
  in no event later than 60 days after the date this Form 8-K is required to be
  filed.
  
                                        -2-
  <PAGE>
   
       (c)  Exhibits
            --------
  
              2.1  Agreement and Plan of Reorganization dated as of February 17,
                   1997.
  
              2.2  Agreement and Plan of Merger dated February 28, 1997, filed
                   with the Secretary of State of the State of California on
                   February 28, 1997.
  
                                        -3-
  <PAGE>
   
                                     SIGNATURES
  
  
       Pursuant to the requirements of the Securities Exchange Act of 1934, the
  Registrant has duly caused this Report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
  
  Dated:    March 13, 1997           SUMMIT DESIGN, INC.
  
  
                                      /s/ C. Albert Koob
                                      ------------------
                                      C. Albert Koob
                                      Vice President of Finance
                                      and Chief Financial Officer
  
                                        -4-
  <PAGE>
   
                                 INDEX TO EXHIBITS
                                 -----------------
  
  
    Exhibit
    Number            Description of Document
    ------            -----------------------
  
  
         2.1  Agreement and Plan of Reorganization dated as of February 17, 1997.
  
         2.2  Agreement and Plan of Merger dated February 28, 1997, filed with the
              Secretary of State of the State of California on February 28, 1997.
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text: SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C.  20549
  
                                      FORM 8-K
  
                                   CURRENT REPORT
  
       Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
  
  Date of Report (Date of earliest event reported):     February 28, 1997
                                                        --------------------------
  
                                SUMMIT DESIGN, INC.
  --------------------------------------------------------------------------------
               (Exact name of registrant as specified in its charter)
   
   Delaware                          0-20923                   93-1137888
  --------------------------------------------------------------------------------
  (State or other                  (Commission                (IRS Employer
  jurisdiction of                  File Number)           Identification Number)
  incorporation)
   
                   9305 S.W. GEMINI DRIVE, BEAVERTON, OREGON          97008
  --------------------------------------------------------------------------------
                    (Address of principal executive offices)        (Zip Code)
   
  Registrant's telephone number, including area code:  (503) 643-9281
                                                       ---------------------------
                                        N/A
  --------------------------------------------------------------------------------
           (Former name or former address, if changed since last report)
  ITEM 2.   ACQUISITION OR DISPOSITION OF ASSETS.
            ------------------------------------ 
  
       On February 28, 1997 (the "Closing Date"), pursuant to an Agreement and
  Plan of Reorganization dated as of February 17, 1997 (the "Reorganization
  Agreement") among Summit Design, Inc., a Delaware corporation ("Summit"), NYE
  Acquisition, Inc., a California corporation and a wholly-owned subsidiary of
  Summit ("Merger Sub"), and TriQuest Design Automation, Inc., a California
  corporation ("TriQuest"), Summit acquired TriQuest by means of a merger (the
  "Merger") of Merger Sub into TriQuest, with TriQuest remaining as the surviving
  corporation in the Merger.  As a result of the Merger, TriQuest became a wholly-
  owned subsidiary of Summit. Merger Sub was formed solely for the purpose of
  effecting the Merger.  Summit is a leading provider of graphical design entry
  and verification software tools and design to test software tools. TriQuest
  develops hardware description language analysis and optimization tools for the
  design of high performance, deep submicron integrated circuits.
  
       Pursuant to the Reorganization Agreement, an aggregate of 775,000 shares of
  Summit Common Stock were issued or reserved for issuance in exchange for (i) all
  of the issued and outstanding capital stock of TriQuest and (ii) all unexpired
  and unexercised options to acquire capital stock of TriQuest.  Each outstanding
  share of TriQuest capital stock was converted into the right to receive a number
  of shares of Summit Common Stock equal to 775,000 divided by the sum of (i) the
  total number of shares of TriQuest capital stock outstanding on the Closing
  Date, and (ii) the total number of shares of TriQuest capital stock subject to
  unexpired and unexercised options to purchase TriQuest capital stock outstanding
  on the Closing Date (the "Exchange Ratio").  All options to purchase TriQuest
  capital stock outstanding immediately prior to the Merger were assumed by
  Summit.  Each such option became exercisable for that number of whole shares of
  Summit Common Stock equal to the product of the number of shares of TriQuest
  capital stock subject to such option multiplied by the Exchange Ratio, with
  cash, less the applicable exercise price, being payable for any fraction of a
  share of Summit Common Stock.  The per share exercise price of each assumed
  option is equal to the quotient determined by dividing the exercise price per
  share of TriQuest capital stock subject to such option immediately prior to the
  Merger by the Exchange Ratio, rounded up to the nearest whole cent.
  
       The consideration paid by Summit for the outstanding capital stock of
  TriQuest pursuant to the Reorganization Agreement was determined pursuant to
  arms' length negotiations and took into account various factors concerning the
  valuation of the business of TriQuest.
  
  ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS.
            --------------------------------- 
  
       (a)  Financial Statements of TriQuest
            --------------------------------
  
            The Financial Information required to be filed pursuant to Item 7(a)
  of Form 8-K was not available at the time of filing of this Current Report on
  Form 8-K and will be filed on a Form 8-K/A as soon as practicable, but in no
  event later than 60 days after the date this Form 8-K is required to be filed.
  
       (b)  Pro Forma Financial Information.
            ------------------------------- 
  
            The Pro Forma Financial Information required to be filed pursuant to
  Item 7(b) of Form 8-K was not available at the time of filing of this Current
  Report on Form 8-K and will be filed on a Form 8-K/A as soon as practicable, but
  in no event later than 60 days after the date this Form 8-K is required to be
  filed.
  
                                        -2-
  (c)  Exhibits
            --------
  
              2.1  Agreement and Plan of Reorganization dated as of February 17,
                   1997.
  
              2.2  Agreement and Plan of Merger dated February 28, 1997, filed
                   with the Secretary of State of the State of California on
                   February 28, 1997.
  
                                        -3-
  SIGNATURES
  
       Pursuant to the requirements of the Securities Exchange Act of 1934, the
  Registrant has duly caused this Report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
  Dated:    March 13, 1997           SUMMIT DESIGN, INC.
  
                                      /s/ C. Albert Koob
                                      ------------------
                                      C. Albert Koob
                                      Vice President of Finance
                                      and Chief Financial Officer
  
                                        -4-
  INDEX TO EXHIBITS
                                 -----------------
  
    Exhibit
    Number            Description of Document
    ------            -----------------------
  
         2.1  Agreement and Plan of Reorganization dated as of February 17, 1997.
  
         2.2  Agreement and Plan of Merger dated February 28, 1997, filed with the
              Secretary of State of the State of California on February 28, 1997.