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):  DECEMBER 1, 1997

                        
                        PERITUS SOFTWARE SERVICES, INC.
                        -------------------------------
              (Exact Name of Registrant as Specified in Charter)


                        COMMISSION FILE NUMBER 0-22647
                        ------------------------------


                   Massachusetts                       04-3126919 
          -------------------------------           ----------------
          (State or Other Jurisdiction of           (I.R.S. Employer
           Incorporation)                           Identification No.)

         304 Concord Road, Billerica, Massachusetts       01821 
- --------------------------------------------------------------------------------
(Address of Principal Executive Offices)                (Zip Code)


                                (978) 670-0800
                                 -------------
             (Registrant's Telephone Number, Including Area Code)

                                Not Applicable
                                --------------
         (Former Name or Former Address, If Changed Since Last Report)


 
Item 2.  Acquisition or Disposition of Assets.
         ------------------------------------

         (a) On December 1, 1997, Twoquay, Inc. ("Twoquay"), a wholly-owned
             subsidiary of the Registrant, acquired substantially all of the
             assets and assumed certain liabilities of the business of
             Millennium Dynamics, Inc. ("MDI") from American Premier
             Underwriters, Inc. ("APU") in exchange for 2,175,000 shares of
             Registrant's Common Stock, $.01 par value per share, and $30
             million in cash. The number of shares issued to APU was determined
             in accordance with the terms of the Asset Purchase Agreement by and
             among the Registrant and Twoquay and APU and MDI dated as of
             October 22, 1997 (the "Purchase Agreement") based on the Average
             Share Price (as defined therein) for the five trading days
             beginning on the second day immediately preceding the date thereof
             and ending on the second trading day immediately following the date
             thereof. The terms of the Asset Purchase Agreement were determined
             on the basis of arm's length negotiations. Prior to the execution
             of the Asset Purchase Agreement, neither the Registrant nor any of
             its affiliates, nor any director or officer of the Registrant or
             any associate of any such director or officer, had any relationship
             with either APU or MDI. The cash portion of the purchase price was
             paid for from the proceeds of the Registrant's initial public
             offering which closed on July 8,1997. The shares of Common Stock
             issued to APU at the closing are entitled to certain registration
             rights as set forth in a Registration Rights Agreement dated as of
             December 1, 1997 by and among the Registrant and APU.

         (b) Certain of the assets acquired by the Registrant included equipment
             or physical property used in MDI's business of providing software
             and consulting services that enable organizations to address their
             year 2000 problem. The Registrant presently intends to continue
             such use of such assets.

Item 7.      Financial Statements, Pro Forma Financial Information and Exhibits.
             ------------------------------------------------------------------
 
(a) and (b)  Financial Statements of Business Acquired and Pro Forma Financial
             Information.
 
             The Registrant has not included the financial statements of the
             business acquired or the pro forma financial information for the
             transaction described in Item 2 above and will file such financial
             information not later than 60 days after this report on Form 8-K is
             due by an amendment to this report.

         (c) Exhibits.

             Documents listed below, except for documents identified by
             footnotes, are being filed as exhibits herewith. Documents
             identified by footnotes, if any, are not being filed herewith and,
             pursuant to Rule 12b-32 of the General Rules and Regulations
             promulgated by the Securities and Exchange Commission (the
             "Commission") under the


 
             Securities Exchange Act of 1934 (the "Exchange Act") reference is
             made to such documents as previously filed as exhibits with the
             Commission. The Registrant's file number under the Exchange Act is
             0-22647.

      2      Asset Purchase Agreement dated as of October 22,1997 by and among
             the Registrant and Twoquay, Inc. and American Premier Underwriters,
             Inc. ("APU") and Millennium Dynamics, Inc.

      4/1/   Specimen certificate for shares of Common Stock.


     99      Registration Rights Agreement dated as of December 1, 1997 by and
             among the Registrant and APU.

(1)  Incorporated by reference to the Registrant's Registration Statement on 
     Form S-1, Commission file number 333-27087.


 
                                  SIGNATURE


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 thereunto duly authorized.



Date:  December 16, 1997

                                          Peritus Software Services, Inc.

                                          By: /s/ Allen K. Deary
                                              ----------------------------------
                                          Allen K. Deary
                                          Vice President, Finance and
                                          Chief Financial Officer (Principal 
                                          Financial Officer)


 
 
                                 EXHIBIT INDEX


Exhibit No.                         Description

    2                    Asset Purchase Agreement dated as of October 22, 1997
                         by and among the Registrant and Twoquay, Inc. and
                         American Premier Underwriters Inc. ("APU") and
                         Millennium Dynamics, Inc.
      
    4/1/                 Specimen certificate for shares of Common Stock.

    99                   Registration Rights Agreement dated as of December 1, 
                         1997 by and among the Registrant in APU.

/1/ Incorporated by reference to the Registrant's Registration Statement on 
    Form S-1, Commission file number 333-27087.