WARBURG PINCUS ASSET MANAGEMENT INC
SC 13G/A, 1999-01-19
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<PAGE>







                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                           (Amendment No. _____2____)*

                                    Core Inc
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    21867P10
                                 (CUSIP Number)

                                December 31, 1998
             (Date of Event Which Requires Filing of this Statement)

             Check the  appropriate  box to designate the rule pursuant to which
this Schedule is filed:

                                [X] Rule 13d-1(b)
                                [ ] Rule 13d-1(c)
                                [ ] Rule 13d-1(d)

  *The remainder of this cover page shall be filled out for a reporting person's
  initial  filing on this form with respect to the subject class of  securities,
  and for any subsequent amendment containing  information which would alter the
  disclosures provided in a prior cover page.

  The  information  required  on the  remainder  of this cover page shall not be
  deemed to be "filed" for the purpose of Section 18 of the Securities  Exchange
  Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
  the Act but shall be subject to all other provisions of the Act (however,  see
  the Notes).






<PAGE>






- -------------------                                        ---------------------
CUSIP No.  21867P10                13G                     Page  2 of   4  Pages
           --------   
- -------------------                                        ---------------------

- ---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Warburg Pincus Asset Management, Inc.                    13-2673503
- ---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                     (a) [ ]
                                                                     (b) [ ]

           Not applicable
- ---------- ---------------------------------------------------------------------
        3  SEC USE ONLY

- ---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
- --------------------------------------------------------------------------------
                         5  SOLE VOTING POWER

                            1,037,700
                    ------------------------------------------------------------
     NUMBER OF           6  SHARED VOTING POWER
      SHARES
   BENEFICIALLY             575,200
     OWNED BY
                     -----------------------------------------------------------
       EACH              7  SOLE DISPOSITIVE POWER
     REPORTING
      PERSON                1,638,800
       WITH
                     -----------------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            0
- --------------------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,638,800
- --------------------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 
           (SEE INSTRUCTIONS)

          Not Applicable
- --------------------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           20.95%
- --------------------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
           IA

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







<PAGE>


Item 1(a):                         Name of Issuer:
- ----------                         ---------------

                                   Core Inc

Item 1(b):                         Address of Issuer's Principal Executive 
- ----------                         --------------------------------------- 
                                   Offices:
                                   --------

                                   18881 Von Karman Avenue
                                   Suite 1750
                                   Irvine, CA  92612

Item 2(a)                          Name of Person Filing
- ---------                          ---------------------

                                   Warburg Pincus Asset Management, Inc.

Item 2(b):                         Address of Principal Business Office:
- ----------                         -------------------------------------

                                   466 Lexington Avenue 
                                   New York, New York 10017

Item 2(c):                         Citizenship:
- ----------                         ------------

                                   Delaware

Item 2(d):                         Title of Class of Securities:
- ----------                         -----------------------------

                                   Common Stock

Item 2(e):                         CUSIP Number:
- ----------                         -------------

                                   21867P10

Item 3:                            If the reporting person is an investment 
- -------                            ---------------------------------------- 
                                   adviser in accordance with ss.
                                   ------------------------------
                                   240.13d-1(b)(1)(ii)(E), check this box. [X]
                                   -------------------------------------------

Item 4:                            Ownership:
- -------                            ----------

                                   (a) Amount beneficially owned:   1,638,800.

                                   (b) Percent of class:   20.95%.

                                   (c)  Number of shares as to which the  person
                                        has:

                                           (i)   Sole power to vote or to direct
                                                 the vote 1,037,700.

                                           (ii)  Shared  power  to  vote  or  to
                                                 direct the vote 575,200.

                                           (iii)  Sole  power to  dispose  or to
                                                  direct the dispostion of 
                                                  1,638,800.

                                           (iv)  Shared  power to  dispose or to
                                                 direct the dispostion of 0.


Item 5:                            Ownership of Five Percent or Less of a Class:
- -------                            ---------------------------------------------

                                   Not Applicable.


                                Page 3 of 4 Pages

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Item 6:                            Ownership of More than Five Percent on Behalf
- -------                            ---------------------------------------------
                                   of Another Person:
                                   ------------------

                                   Warburg   Pincus   Asset   Management,   Inc.
                                   ("WPAM") is an Investment  Adviser registered
                                   with  the  United   States   Securities   and
                                   Exchange    Commission.    WPAM   serves   as
                                   investment adviser to many accounts including
                                   various registered investment companies.  The
                                   securities  which  are  the  subject  of this
                                   report  are  owned by our  accounts.  In this
                                   report no account owned more than 5%.


Item 7:                            Identification and Classification of the
- -------                            ----------------------------------------
                                   Subsidiary Which Acquired the Security Being
                                   --------------------------------------------
                                   Reported on By the Parent Holding Company:
                                   ------------------------------------------

                                   Not Applicable.

Item 8:                            Identification and Classification of
- -------                            ------------------------------------
                                   Members of the Group:
                                   ---------------------

                                   Not Applicable.

Item 9:                            Notice of Dissolution of Group:
- -------                            -------------------------------

                                   Not Applicable.

Item 10:                           Certification:
- --------                           --------------

                                   By signing  below I certify that, to the best
                                   of my knowledge  and belief,  the  securities
                                   referred to above were  acquired and are held
                                   in the  ordinary  course of business and were
                                   not acquired and are not held for the purpose
                                   of  or  with  the  effect  of   changing   or
                                   influencing  the control of the issuer of the
                                   securities  and were not acquired and are not
                                   held in  connection  with or as a participant
                                   in any  transaction  having  that  purpose or
                                   effect.



                                    SIGNATURE

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

Dated: January 8, 1999



                                                By:/s/ Linda S. Iovan
                                                   ------------------
                                                   Name:  Linda S. Iovan
                                                   Title: Vice President







                                Page 4 of 4 Pages



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