Exhibit 4.2

                                   AMENDMENT
                           TO STOCKHOLDERS AGREEMENT
                          Dated as of October 2, 2000


     DDi Corp., a Delaware corporation (the "Company"), Bain Capital Fund V,
L.P., Bain Capital Fund V-B, L.P., BCIP Associates, L.P., and BCIP Trust
Associates, L.P., and the Other Investors and Managers signatories hereto:

     1.   Reference to the Stockholders Agreement; Definitions.  Reference is
          made to the Stockholders Agreement dated as of April 14, 2000 (as
          amended, the "Stockholders Agreement"), among the Company and the
          holders of its equity interests (including without limitation the
          other parties hereto).  Terms defined in the Stockholders Agreement
          and not otherwise defined herein are used herein with the meanings so
          defined.

     2.   Amendment. Pursuant to Section 12.2 of the Stockholders Agreement,
          each Investor and each other signatory hereto hereby agrees to amend
          Section 8.4.4 of the Stockholders Agreement by deleting the second
          sentence thereof and replacing it with the following sentence:

          "In the case of any Public Offering that is not the IPO or effected
          pursuant to Section 8.2A, each holder of Shares agrees to enter into a
          reasonable form of agreement, approved by the Company, restricting the
          Transfer of any Common Stock during the period beginning seven days
          immediately preceding and ending on the 90th day following the
          effective date of the registration statement used in connection with
          such offering if the underwriters managing such Public Offering demand
          such an agreement."

     2.   Miscellaneous.  Except to the extent specifically amended hereby, the
          provisions of the Stockholders Agreement shall remain unmodified, and,
          subject to the conditions contained in this Amendment, the
          Stockholders Agreement is hereby confirmed as being in full force and
          effect.  This Amendment may be executed in any number of counterparts
          which together shall constitute one instrument, shall be governed by
          and construed in accordance with the laws of the State of Delaware,
          without regard to the conflict of laws rules of any jurisdictions.


                                                                    Amendment to
                                                          Stockholders Agreement
                                                                 October 2, 2000

     In WITNESS WHEREOF, the parties have caused this Amendment to the
Stockholders Agreement to be executed and delivered as of the date first above
written.


                                         DDI CORP.



                                         By  /s/ JOSEPH P. GISCH
                                           --------------------------------
                                           Name:
                                           Title:

INVESTORS:
                                         BAIN CAPITAL FUND V, L.P.
                                         BAIN CAPITAL FUND V-B, L.P.

                                         By Bain Capital Partners V, L.P.,
                                                their general partner

                                         By Bain Capital Investors V, Inc.,
                                           its general partner


                                         By  /s/ EDWARD CONARD
                                           --------------------------------
                                           Name:
                                           Title:  Managing Director


                                         BCIP ASSOCIATES
                                         BCIP TRUST ASSOCIATES, L.P.


                                         By  /s/ EDWARD CONARD
                                           --------------------------------
                                           Name:
                                           Title: a general partner


                                                                    Amendment to
                                                          Stockholders Agreement
                                                                 October 2, 2000

OTHER INVESTORS:
                                         CELERITY DYNAMO, L.L.C.


                                         By  /s/ [ILLEGIBLE]
                                           --------------------------------
                                            its Manager

                                         CELERITY LIQUIDS, L.L.C.


                                         By  /s/ [ILLEGIBLE]
                                           --------------------------------
                                            its Manager

                                         CELERITY DETAILS, L.L.C.


                                         By  /s/ [ILLEGIBLE]
                                           --------------------------------
                                            its Manager


                                                                    Amendment to
                                                          Stockholders Agreement
                                                                 October 2, 2000

OTHER INVESTORS:
                                         CHASE MANHATTAN CAPITAL, L.P.


                                         By  /s/ [ILLEGIBLE]
                                           --------------------------------
                                            its


                                         CHASE SECURITIES INC.


                                         By  /s/ [ILLEGIBLE]
                                           --------------------------------
                                            its


                                         DI INVESTORS, L.L.C.


                                         By  /s/ [ILLEGIBLE]
                                           --------------------------------
                                            its


                                                                    Amendment to
                                                          Stockholders Agreement
                                                                 October 2, 2000

MANAGERS:

                                         /s/ CHARLES D. DIMICK
                                         --------------------------------
                                         Charles D. Dimick

                                         /s/ BRUCE D. MCMASTER
                                         --------------------------------
                                         Bruce D. McMaster

                                         /s/ JOSEPH P. GISCH
                                         --------------------------------
                                         Joseph P. Gisch