Document:

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                                                                   EXHIBIT 10.52

            FORM OF AGREEMENT TO BE BOUND BY REGISTRATION AGREEMENT
            -------------------------------------------------------

     The undersigned, [insert the name of each entity and individual who is
become a party to the Registration Agreement], hereby certify to, and agree with
ZC Acquisition Corp, a Delaware corporation ("ZC Corp"), as follows:

     1.  The undersigned have each read a copy of that certain Registration
Agreement, dated March 23, 1999 (the "Registration Agreement"), by and among ZC
Corp, CTCR Fund VI, L.P., a Delaware limited partnership, CTCR VI Executive
Fund, L.P., a Delaware limited partnership, GTCR Associates VI, a Delaware
general partnership, William Seibel and any other executive employees of ZC Corp
or other entities and individuals who, at any time, acquire securities of ZC
Corp in accordance with Section 8 of the Registration Agreement

     2.  The undersigned agree that their signatures below shall constitute an
executed counterpart signature page to the Registration Agreement and that they
shall succeed to all of the rights and obligations of an "Other Stockholder"
under the Registration Agreement as contemplated by Section 8 of the
Registration agreement.

     Executed this ____ day of _______________, _____.

[Insert a signature line for each entity and individual who is becoming a party
to the Registration Agreement]

     As required by Section 8 of the Registration Agreement referred to above,
the undersigned hereby consents to [insert the name of each entity and
individual who is becoming a party to the Registration Agreement] succeeding to
all of the rights and obligations of an "Other Stockholder" under such
Registration Agreement.

                                                GTCR FUND VI, L.P.
                                                By:   GTCR Partners VI, L.P.
                                                Its:  General Partner

                                                By:   GTCR Golder Rauner, LLC
                                                Its:  General Partner

                                                By:   _________________________
                                                Its:  Principal
<PAGE>

     The foregoing agreement was entered into between ZEFER Corp. and the
following stockholders as of the date set forth opposite each stockholders'
name:

     1261417 Ontario Limited, April 30, 1999
     Matthew P. Burkley, April 30, 1999
     Ian R. Colliety, April 30, 1999
     Stephen R. DiMarco, April 30, 1999
     Deborah E. Frieze, April 30, 1999
     Edmond C. Jay, April 30, 1999
     Alexandre Scherer, April 30, 1999
     Kaming Ng, April 30, 1999
     Anthony K. Tjan, April 30, 1999
     Gregory S. Hipwell, May 14, 1999
     Jason J. Zada, May 14, 1999
     Renaissance Worldwide, Inc., May 28, 1999
     Allan L. Cohen, September 13, 1999
     Fred Luconi, September 13, 1999
     Thomas J. Waite, September 13, 1999
     David A. Lubin, April 11, 2000<PAGE>

                                                                   EXHIBIT 10.57
                         FORM OF TERMINATION AGREEMENT
                         -----------------------------

          This TERMINATION AGREEMENT (this "Amendment") is made this ___ day of
                                            ---------
April, 2000, by and among ZEFER Corp., a Delaware corporation (the "Company"),
                                                                    -------
GTCR Fund VI, L.P., a Delaware limited partnership ("GTCR Fund VI"), GTCR VI
                                                     ------------
Executive Fund, L.P., a Delaware limited partnership ("Executive Fund"), GTCR
                                                       --------------
Associates VI, a Delaware general partnership ("Associates Fund"), GTCR Capital
                                                ---------------
Partners, L.P., a Delaware limited partnership ("GTCR Capital") and GTCR Golder
                                                 ------------
Rauner, L.L.C. ("Golder Rauner").  GTCR Fund VI, Executive Fund and Associates
                 -------------
Fund are collectively referred to herein as the "Purchasers" and individually as
                                                 ----------
a "Purchaser."
   ---------

          WHEREAS, the Company and the Purchasers are parties to that certain
Purchase Agreement, dated as of March 23, 1999 (as amended and modified from
time to time) (the "Purchase Agreement"); and
                    ------------------

          WHEREAS, the Company, the Purchasers and certain stockholders of the
Company are parties to that certain Stockholders Agreement, dated as of March
23, 1999 (as amended and modified from time to time) (the "Stockholders
                                                           ------------
Agreement"); and
---------

          WHEREAS, the Company and Golder Rauner are parties to that certain
Professional Services Agreement, dated as of March 23, 1999 (as amended and
modified from time to time) (the "Services Agreement"); and
                                  ------------------

          WHEREAS, the parties hereto wish to clarify that the Purchase
Agreement, the Stockholders Agreement and the Services Agreement shall terminate
upon the closing (the "Closing") of the Company's initial public offering of its
                       -------
common stock pursuant to an effective registration statement under the
Securities Act of 1933 (the "IPO");
                             ---

          NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

     1.   The Purchase Agreement, and the rights and obligations of each party
thereto, shall  terminate effective upon the Closing.

     2.   The Stockholders Agreement, and the rights and obligations of each
party thereto, shall  terminate effective upon the Closing.  Subject to the
Closing, the Purchasers and GTCR Capital waive the requirement that the persons
(the "Transferees") to whom certain stockholders of the Company (the
      -----------
"Transferors") have transferred Stockholder Shares (as defined in the
 -----------
Stockholders Agreement) execute and deliver to the Company and the other
Stockholders (as defined in the Stockholders Agreement) a Joinder to
Stockholders Agreement or an instrument agreeing to be bound by the restrictions
on transfer embodied in employment agreements entered into between the Company
and each of the Transferors.  The parties hereto acknowledge that, under
separate cover of even date herewith, the Company has provided the Purchasers
and GTCR Capital with a list of the Transferors, Transferees and Stockholder
Shares transferred from the Transferors to the Transferees. Subject to the
Closing, the Company, the Purchasers and GTCR Capital also waive
<PAGE>

any first refusal rights set forth in Section 4 of the Stockholders Agreement
with respect to the Stockholder Shares transferred by the Transferors to the
Transferees.

     3.   The Services Agreement, and the rights and obligations of each party
thereto, shall terminate effective upon the Closing.  The parties hereto confirm
that no placement fees will be payable by the Company to GTCR in connection with
the IPO.

     4.   Subject to the Closing, the parties hereto hereby mutually release and
forever discharge each other, and their respective employees, officers,
directors, agents, attorneys, successors, subsidiaries, and affiliates from any
and all liabilities, obligations, disputes, suits, causes of action and all
other claims of every kind and nature which they now have or ever had which
arise out of or in connection with the Purchase Agreement, the Stockholders
Agreement and the Services Agreement.  The parties hereto further agree and
acknowledge that there are no amounts due or payable pursuant to any other party
pursuant to the terms of the Purchase Agreement, the Stockholders Agreement or
the Services Agreement.

     5.   This Agreement may be executed in two or more counterparts, each of
which shall for all purposes be deemed to be an original and all of which shall
constitute the same instrument.

                             *      *      *      *

                                       2
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed on the day and year first above written.

                                    ZEFER CORP.

                                    By:
                                         ---------------------------------
                                    Its: President
                                         ---------------------------------

                                    GTCR GOLDER RAUNER, L.L.C.

                                    By:
                                         ---------------------------------
                                    Its: Principal

                                    GTCR FUND VI, L.P.

                                    By:  GTCR Partners VI, L.P.
                                    Its: General Partner

                                    By:  GTCR Golder Rauner, LLC
                                    Its: General Partner

                                    By:
                                         ---------------------------------
                                    Its: Principal

                                    GTCR VI EXECUTIVE FUND, L.P.

                                    By:  GTCR Partners VI, L.P.
                                    Its: General Partner

                                    By:  GTCR Golder Rauner, L.L.C.
                                    Its: General Partner

                                    By:
                                         ---------------------------------
                                    Its: Principal

                               SIGNATURE PAGE TO
                             TERMINATION AGREEMENT
<PAGE>

                                    GTCR ASSOCIATES VI

                                    By:  GTCR Partners VI, L.P.
                                    Its: Managing General Partner

                                    By:  GTCR Golder Rauner, L.L.C.
                                    Its: General Partner

                                    By
                                         ---------------------------------
                                    Its: Principal

                                    GTCR CAPITAL PARTNERS, L.P.

                                    By:  GTCR Mezzanine Partners, L.P.
                                    Its: General Partner

                                    By:  GTCR Partners VI, L.P.
                                    Its: General Partner

                                    By:  GTCR Golder Rauner, L.L.C.
                                    Its: General Partner

                                    By:
                                         ---------------------------------
                                    Its: Principal

                               SIGNATURE PAGE TO
                             TERMINATION AGREEMENT

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