Document:

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                                                                    EXHIBIT 10.5

                             REGISTRATION AGREEMENT

     THIS REGISTRATION AGREEMENT (this "AGREEMENT") is made as of February 18,
2000, by and among Corechange, Inc., a Delaware corporation (the "COMPANY"),
each of the Persons listed on the SCHEDULE OF INVESTORS attached hereto
(collectively referred to herein as the "INVESTORS" and individually as an
"INVESTOR"), HarbourVest Venture Partners V Direct Fund L.P. ("HARBOURVEST"),
and each of the other holders of Registrable Securities who may from time to
time become a party hereto by executing a counterpart to this Agreement.

     WHEREAS, the Investors and the Company are party to a Series B Convertible
Preferred Stock Purchase Agreement of even date herewith (the "PURCHASE
AGREEMENT"), pursuant to which the Investors acquired shares of the Company's
Series B Preferred, par value $.01 per share;

     WHEREAS, the Company and HarbourVest are parties to the Convertible
Preferred Stock Purchase Agreement dated January 21, 1998 (the "HARBOURVEST
AGREEMENT"), that contains in Sections 8.5 through 8.14 certain provisions
relating to registration of Company securities in the event of a public offering
therefor;

     WHEREAS, in order to induce the Investors to enter into the Purchase
Agreement, the Company and HarbourVest have agreed to enter into this Agreement,
which shall supersede in all respects the provisions set forth in Sections 8.5
through 8.14 of the HarbourVest Agreement, and shall provide in lieu thereof the
registration rights set forth in this Agreement; and

     WHEREAS, the execution and delivery of this Agreement is a condition to the
Closing under the Purchase Agreement.

     NOW, THEREFORE, in consideration of the mutual covenants contained herein
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the parties to this Agreement intending to be legally
bound hereby agree as follows:

     Unless otherwise provided in this Agreement, certain terms used herein
shall have the meanings set forth in SECTION 11 hereof.

     SECTION 1. REQUESTED REGISTRATION.

     (a) REQUEST FOR REGISTRATION. At any time after the second year after the
First Closing (as defined in the Purchase Agreement), if the Company shall
receive from Initiating Holders a written request that the Company effect any
registration with respect to all or a part of the Registrable Securities, the
Company will:

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          (i) promptly give written notice of the proposed registration to all
     other Holders; and

          (ii) as soon as practicable, use its diligent best efforts to effect
     such registration (including, without limitation, the execution of an
     undertaking to file post-effective amendments, appropriate qualification
     under applicable blue sky or other state securities laws, appropriate
     compliance with applicable regulations issued under the Securities Act and
     listing on appropriate exchanges) as may be so requested and as would
     permit or facilitate the sale and distribution of all or such portion of
     such Registrable Securities as are specified in such request, together with
     all or such portion of the Registrable Securities of any Holder or Holders
     joining in such request as are specified in a written request given by any
     other Holder within 20 days after receipt of such written notice from the
     Company; PROVIDED that the Company shall not be obligated to effect, or to
     take any action to effect, any such registration or any related actions
     pursuant to this SECTION 1(A): (A) in any jurisdiction in which the Company
     would be required to execute a general consent to service of process in
     effecting such registration, qualification or compliance, or in which the
     cost of the foregoing is unreasonable in light of the number of Registrable
     Securities requested to be sold in such jurisdiction, unless the Company is
     already subject to service in such jurisdiction and except as may be
     required by the Securities Act or applicable rules or regulations
     thereunder; (B) if at the time of any request to register Registrable
     Securities pursuant to this SECTION 1(A), the Company is engaged or has
     fixed plans to engage within 30 days of the time of the request in a
     registered public offering as to which the Holders may include Registrable
     Securities pursuant to SECTION 2 or is engaged in any other activity which,
     in the good faith determination of the Company's Board of Directors, would
     be adversely affected by the requested registration to the material
     detriment of the Company, then the Company may at its option direct that
     such request be delayed for a period not in excess of six months from the
     effective date of such offering or the date of commencement of such other
     material activity, as the case may be, such right to delay a request to be
     exercised by the Company not more than once in any one-year period; (C)
     within six months after the effective date of any other registration of the
     Company's securities; (D) for a registration on Form S-1 or S-2, the
     aggregate value of the Registrable Securities being registered is less than
     $5,000,000; or (E) for a registration on Form S-3, the aggregate value of
     the Registrable Securities being registered is less than $250,000.

Subject to the foregoing clauses (A), the Company shall file a registration
statement covering the Registrable Securities so requested to be registered as
soon as practicable, after receipt of the request or requests of the Initiating
Holders.

          The Holders of Series A Preferred shall be entitled, as Initiating
Holders, to no more than two requested registrations under this SECTION 1(A).
The Holders of Series B Preferred shall be entitled, as Initiating Holders, to
no more than two requested registrations under this SECTION 1(A). A registration
shall not count as one of the permitted requested registrations hereunder until
it has become effective.

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               The registration statement filed pursuant to the request of the
     Initiating Holders may, subject to the provisions of SECTION 1(B) below,
     include other securities of the Company which are held by officers or
     directors of the Company or which are held by persons who, by virtue of
     agreements with the Company, are entitled to include their securities in
     any such registration, but except as provided in the last sentence of
     SECTION 1(B) below the Company shall have no right to include any of its
     securities in any such registration.

               (b) UNDERWRITING. If the Initiating Holders intend to distribute
     the Registrable Securities covered by their request by means of an
     underwritten offering, they shall so advise the Company as part of their
     request made pursuant to Section 1(c) and the Company shall include such
     information in the written notice referred to in Section 1(a) above. The
     right of any Holder to registration pursuant to SECTION 1 shall be
     conditioned upon such Holder's participation in such underwriting and the
     inclusion of such Holder's Registrable Securities in the underwriting
     (unless otherwise mutually agreed by a majority in interest of the
     Initiating Holders, the underwriters and such Holder with respect to such
     participation and inclusion) to the extent provided herein. A Holder may
     elect to include in such underwriting all or a part of the Registrable
     Securities he holds.

               If officers or directors of the Company holding other securities
     of the Company shall request inclusion in any registration pursuant to
     SECTION 1, or if holders of securities of the Company who are entitled, by
     contract with the Company, to have securities included in such a
     registration (the "OTHER SHAREHOLDERS") request such inclusion, the
     Initiating Holders shall to the extent permitted by applicable laws and
     regulations, on behalf of all Holders, offer to include the securities of
     such officers, directors and Other Shareholders in the underwriting and may
     condition such offer on their acceptance of the further applicable
     provisions of this Agreement. The Company shall (together with all Holders,
     officers, directors and Other Shareholders proposing to distribute their
     securities through such underwriting) enter into an underwriting agreement
     in customary form (including, without limitation, customary indemnification
     and contribution provisions on the part of the Company) with the
     representative of the underwriter or underwriters selected for such
     underwriting by a majority in interest of the Initiating Holders and
     reasonably acceptable to the Company; PROVIDED that such underwriting
     agreement shall not provide for indemnification or contribution obligations
     on the part of Holders greater than the obligations of the Holders pursuant
     to SECTION 5. Notwithstanding any other provision of this Agreement, if the
     representative advises the Initiating Holders in writing that marketing
     factors require a limitation on the number of shares to be underwritten,
     the securities of the Company held by officers or directors of the Company
     and the Other Shareholders (other than Registrable Securities) shall be
     excluded from such registration to the extent so required by such
     limitation and if a limitation of the number of shares is still required,
     the Initiating Holders shall so advise all Holders of Registrable
     Securities whose securities would otherwise be underwritten pursuant hereto
     and the number of shares of securities that may be included in the
     registration and underwriting shall be allocated among all such Holders in
     proportion, as nearly as practicable, to the respective amounts of
     Registrable Securities of the Company which they held at the time of the
     request for registration made by the Initiating Holders pursuant to SECTION
     1(A). No Registrable Securities or any other securities excluded from the
     underwriting by reason of the underwriter's marketing limitation shall be
     included in such registration. If any Holder of Registrable Securities,

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     officer, director or Other Shareholder who has requested inclusion in such
     registration as provided above disapproves of the terms of the
     underwriting, such person may elect to withdraw therefrom by written notice
     to the Company, the underwriter and the Initiating Holders. The securities
     so withdrawn shall also be withdrawn from registration. If the underwriter
     has not limited the number of Registrable Securities or other securities to
     be underwritten, the Company may include its securities for its own account
     in such registration if the underwriter so agrees and if the number of
     Registrable Securities and other securities which would otherwise have been
     included in such registration and underwriting will not thereby be limited.

               SECTION 2. COMPANY REGISTRATION.

               (a) If the Company shall determine to register any of its
     securities either for its own account or the account of a security holder
     or holders exercising their respective demand registration rights, other
     than a registration relating solely to employee benefit plans, or a
     registration relating solely to a Commission Rule 145 transaction or a
     registration on any registration form which does not permit secondary sales
     or does not include substantially the same information as would be required
     to be included in a registration statement covering the sale of Registrable
     Securities, the Company will:

               (i) promptly give to each Holder written notice thereof (which
          shall include a list of the jurisdictions in which the Company intends
          to attempt to qualify such securities under the applicable blue sky or
          other state securities laws); provided that the Company shall not be
          required to provide prior written notice of any registration to the
          extent the Holders would not be entitled to include Registrable
          Securities in the Registration Statement pursuant to SECTION 2(B); and

               (ii) include in such registration (and any related qualification
          under blue sky laws or other compliance), and in any underwriting
          involved therein, all the Registrable Securities specified in a
          written request or requests, made by any Holder within fifteen days
          after written notice from the Company described in clause (i) above,
          except as set forth in SECTION 2(B) below. Such written request may
          specify all or a part of a Holder's Registrable Securities.

     Notwithstanding the foregoing, the Company shall have the right to postpone
     or withdraw any registration effected pursuant to this SECTION 2 without
     obligation to any Holder.

               (b) UNDERWRITING. If the registration of which the Company gives
     notice is for a registered public offering involving an underwriting, the
     Company shall so advise the Holders as a part of the written notice given
     pursuant to SECTION 2(A)(I). In such event the right of any Holder to
     registration pursuant to SECTION 2 shall be conditioned upon such Holder's
     participation in such underwriting and the inclusion of such Holder's
     Registrable Securities in the underwriting to the extent provided herein.
     All Holders proposing to distribute their securities through such
     underwriting shall (together with the Company and, directors, officers and
     the Other Shareholders

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     distributing their securities through such underwriting) enter into an
     underwriting agreement in customary form with the underwriter or
     underwriters selected for underwriting by the Company, PROVIDED that the
     Company shall use its reasonable best efforts to ensure that such
     underwriting agreement shall not provide for indemnification or
     contribution obligations on the part of Holders materially greater than the
     obligations of the Holders pursuant to SECTION 5. Notwithstanding any other
     provision of this SECTION 2, if the underwriter determines that marketing
     factors require a limitation on the number of shares to be underwritten,
     the underwriter may (subject to the allocation priority set forth below)
     exclude from such registration and underwriting some or all of the
     Registrable Securities which would otherwise be underwritten pursuant
     hereto. The Company shall so advise all holders of securities requesting
     registration, and the number of shares of securities that are entitled to
     be included in the registration and underwriting shall be allocated in the
     following manner. The securities of the Company held by the Other
     Shareholders and the officers and directors of the Company (other than
     Registrable Securities and up to 2,400,000 of the Company's shares held by
     Ulf Arnetz) shall be excluded from such registration and underwriting to
     the extent required by such limitation, and, if a limitation on the number
     of shares is still required, the number of shares that may be included in
     the registration and underwriting shall be allocated among all such Holders
     in proportion, as nearly as practicable, to the respective amounts of
     Registrable Securities and other securities which they held at the time the
     Company gives the notice specified in SECTION 2(a)(i), PROVIDED that if
     such registration has been initiated at the request of Cambridge Technology
     Partners ("CTP") pursuant to the exercise of demand registration rights
     granted prior to the date of this Agreement, CTP may include up to 202,106
     shares of the Company's stock in priority to any Registrable Securities.
     For purposes of the foregoing calculation, Ulf Arnetz shall be deemed to
     hold the lesser of 2,400,000 shares of the Company's stock and the actual
     number of shares of the Company's stock (other than shares acquired
     pursuant to stock options) owned by Ulf Arnetz at such time. If any Holder
     of Registrable Securities or any officer, director or Other Shareholder
     disapproves of the terms of any such underwriting, he may elect to withdraw
     therefrom by written notice to the Company and the underwriter. Any
     Registrable Securities or other securities excluded or withdrawn from such
     underwriting shall be withdrawn from such registration.

               SECTION 3. EXPENSES OF REGISTRATION. All Registration Expenses
     incurred in connection with any registration, qualification or compliance
     pursuant to this Agreement shall be borne by the Company, and all Selling
     Expenses shall be borne by the holders of the securities so registered pro
     rata on the basis of the number of their shares so registered; PROVIDED,
     however, that the Company shall not be required to pay any Registration
     Expenses if, as a result of the withdrawal of a request for registration by
     Initiating Holders (other than due to a material adverse change in the
     business of the Company occurring after the date in which registration was
     requested or any refusal to proceed based upon the advice of counsel that
     the registration statement, or any prospectus contained therein, contains
     an untrue statement of a material fact or omits to state a material fact
     required to be stated therein or necessary to make the statements therein
     not misleading in light of the circumstances then existing, provided that
     such withdrawal is made within 10 days after the Initiating Holders become
     aware of the material adverse change or such advice from counsel, as
     applicable), the registration statement does not become effective, in which
     case the Holders and

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     Other Shareholders requesting registration shall bear such Registration
     Expenses pro rata on the basis of the number of their shares so included in
     the registration request.

               SECTION 4. REGISTRATION PROCEDURES. In the case of each
     registration effected by the Company pursuant to this Agreement, the
     Company will keep each Holder advised in writing as to the initiation of
     each registration and as to the completion thereof. At its expense, the
     Company will:

               (a) use its best efforts to keep such registration effective for
          a period of one hundred twenty days or until the Holder or Holders
          have completed the distribution described in the registration
          statement relating thereto, whichever first occurs; provided, however,
          that (I) such 120-day period shall be extended for a period of time
          equal to the period the Holder refrains from selling any securities
          included in such registration in accordance with provisions in SECTION
          10 hereof; PROVIDED that Rule 415, or any successor rule under the
          Securities Act, permits an offering on a continuous or delayed basis,
          and PROVIDED, FURTHER, that applicable rules under the Securities Act
          governing the obligation to file a post-effective amendment permit, in
          lieu of filing a post-effective amendment which includes any
          prospectus required by Section 10(a)(3) of the Securities Act, the
          incorporation by reference of information contained in periodic
          reports filed pursuant to Section 13 or 15(d) of the Exchange Act in
          the registration statement;

               (b) furnish such number of prospectuses and other documents
          incident thereto as a Holder from time to time may reasonably request
          in order to facilitate the public sale or other disposition of the
          Registrable Securities by such Holder;

               (c) in connection with any underwritten offering pursuant to a
          registration statement filed pursuant to SECTION 1 hereof, enter into
          an underwriting agreement reasonably necessary to effect the offer and
          sale of Common Stock, provided such underwriting agreement contains
          customary underwriting provisions and provided further that if the
          underwriter so requests the underwriting agreement will contain
          customary contribution provisions on the part of the Company.

               SECTION 5. INDEMNIFICATION.

               (a) The Company will, and hereby does, indemnify each Holder,
     each of its officers, directors and partners, and each person controlling
     such Holder (within the meaning of the Securities Act), with respect to
     which registration has been effected pursuant to this Agreement, and each
     underwriter, if any, and each person who controls any underwriter (within
     the meaning of the Securities Act), with respect to such sale, against all
     claims, losses, damages and liabilities (or actions in respect thereof)
     arising out of or based on any untrue statement (or alleged untrue
     statement) of a material fact contained in any registration statement or
     prospectus, incident to any such registration, qualification or compliance,
     or based on any omission (or alleged omission) to state therein a material
     fact required to be stated therein or necessary to make the statements
     therein not misleading, or any violation by the Company of the Securities
     Act or any rule or regulation

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     thereunder applicable to the Company and relating to action or inaction
     required of the Company in connection with any such registration,
     qualification or compliance, and will reimburse each such Holder (within
     the meaning of the Securities Act), each of its officers, directors and
     partners, and each person controlling such Holder, each such underwriter
     and each person who controls any such underwriter (within the meaning of
     the Securities Act), for any legal and any other expenses reasonably
     incurred in connection with investigating and defending any such claim,
     loss, damage, liability or action, PROVIDED that the Company will not be
     liable in any such case to the extent that any such claim, loss, damage,
     liability or expense arises out of or is based on any untrue statement
     (or alleged untrue statement) or omission (or alleged omission) in
     reliance upon and in conformity with or based upon written information
     furnished to the Company by such Holder or underwriter or controlling
     person and stated to be specifically for use therein.

               (b) Each Holder will and hereby does, if Registrable Securities
     held by him are included in the securities as to which such registration,
     qualification or compliance is being effected, indemnify the Company, each
     of its directors and officers and each underwriter, if any, of the
     Company's securities covered by such a registration statement, each person
     who controls the Company or such underwriter within the meaning of the
     Securities Act and the rules and regulations thereunder, each other such
     Holder and Other Shareholder and each of their officers, directors and
     partners, and each person controlling such Holder or Other Shareholder,
     against all claims, losses, damages and liabilities (or actions in respect
     thereof) arising out of or based on any untrue statement (or alleged untrue
     statement) of a material fact contained in any such registration statement,
     or prospectus, or based on any omission (or alleged omission) to state
     therein a material fact required to be stated therein or necessary to make
     the statements therein not misleading, or any violation by the Holder of
     the Securities Act or any rule or regulation

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               thereunder applicable to the Holder and relating to action or
     inaction required of the Holder in connection with any such registration,
     qualification or compliance, and will reimburse the Company and such
     Holders, Other Shareholders, directors, officers, partners, persons,
     underwriters or control persons for any legal or any other expenses
     reasonably incurred in connection with investigating or defending any such
     claim, loss, damage, liability or action, in each case to the extent, but
     only to the extent, that such untrue statement (or alleged untrue
     statement) or omission (or alleged omission) is made in such registration
     statement or prospectus in reliance upon and in conformity with written
     information furnished to the Company by such Holder and stated to be
     specifically for use therein; PROVIDED, however, that the obligations of
     such Holders hereunder shall be limited to an amount equal to the proceeds
     to each such Holder of Registrable Securities sold pursuant to such
     registration as contemplated herein.

               (c) Each party entitled to indemnification under this SECTION 5
     (the "Indemnified Party") shall give notice to the party required to
     provide indemnification (the "Indemnifying Party") promptly after such
     Indemnified Party has actual knowledge of any claim as to which indemnity
     may be sought, but the failure of any Indemnified Party to give notice
     shall not relieve the Indemnifying Party of its obligation under this
     SECTION 5 except to the extent that the Indemnifying Party is adversely
     affected by such failure. The Indemnifying Party will be entitled to
     participate in, and to the extent that it may elect by written notice
     delivered to the Indemnified Party promptly after receiving the aforesaid
     notice from such Indemnified Party, at its expense to assume, the defense
     of

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     any such claim or any litigation resulting therefrom, with counsel
     reasonably satisfactory to such Indemnified Party, PROVIDED that the
     Indemnified Party may participate in such defense at its expense,
     notwithstanding the assumption of such defense by the Indemnifying Party,
     and PROVIDED, FURTHER, that if the Indemnified Party shall have reasonably
     concluded upon advice of counsel that representation of such Indemnified
     Party by the counsel retained by the Indemnifying Party would be
     inappropriate due to actual or potential differing interests between the
     Indemnified Party and any other party represented by such counsel in such
     proceeding, the Indemnified Party or Parties shall have the right to select
     separate counsel to assert such legal defenses and to otherwise participate
     in the defense of such action on behalf of such Indemnified Party or
     Parties and the fees and expenses of such counsel shall be paid by the
     Indemnifying Party. No Indemnifying Party, in the defense of any such claim
     or litigation, shall, except with the consent of each Indemnified Party,
     consent to entry of any judgment or enter into any settlement which does
     not include as an unconditional term thereof the giving by the claimant or
     plaintiff to such Indemnified Party of a release from all liability in
     respect to such claim or litigation. Each Indemnified Party shall furnish
     such information regarding itself or the claim in question as an
     Indemnifying Party may reasonably request in writing and as shall be
     reasonably required in connection with defense of such claim and litigation
     resulting therefrom. No Indemnified Party shall consent to entry of any
     judgment or settle any claim or litigation without the prior written
     consent of the Indemnifying Party.

               SECTION 6. INFORMATION BY HOLDER. Each Holder of Registrable
     Securities shall furnish to the Company such information regarding such
     Holder and the distribution proposed by such Holder as the Company may
     reasonably request in writing and as shall be reasonably required in
     connection with any registration, qualification or compliance referred to
     in this Agreement.

               SECTION 7. LIMITATIONS ON REGISTRATION OF ISSUES OF SECURITIES.
     From and after the date of this Agreement, the Company shall not, without
     the prior written consent of Holders holding at least a majority of the
     Series A Registrable Securities and the holders of at least a majority of
     the Series B Registrable Securities enter into any agreement (other than
     this Agreement) with any holder or prospective holder of any securities of
     the Company giving such holder or prospective holder the right to require
     the Company to initiate any registration of any securities of the Company,
     PROVIDED that this SECTION 7 shall not limit the right of the Company to
     enter into any agreements with any holder or prospective holder of any
     securities of the Company giving such holder or prospective holder the
     right to require the Company, upon any registration of any of its
     securities, to include, among the securities which the Company is then
     registering, securities owned by such holder if such right is subject to
     the limitations and cutbacks set forth in this Agreement with respect to
     Other Shareholders. Any right given by the Company to any holder or
     prospective holder of the Company's securities in connection with the
     registration of securities shall be conditioned such that it shall not be
     inconsistent with or more favorable than the rights of the Holders provided
     in this Agreement, including the exclusion of such holder's or prospective
     holder's securities from registration under the circumstances specified in
     SECTIONS 1 and 2.

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               SECTION 8. RULE 144 REPORTING. With a view to making available
     the benefits of certain rules and regulations of the Commission which may
     permit the sale of the Restricted Securities to the public without
     registration, the Company agrees to:

               (a) make and keep public information available as those terms are
          understood and defined in Rule 144 under the Securities Act, at all
          times from and after ninety days following the effective date of the
          first registration under the Securities Act filed by the Company for
          an offering of its securities to the general public;

               (b) use its best efforts to file with the Commission in a timely
          manner all reports and other documents required of the Company under
          the Securities Act and the Exchange Act at any time after it has
          become subject to such reporting requirements; and

               (c) so long as a Holder owns any Restricted Securities, furnish
          to such Holder forthwith upon request a written statement by the
          Company as to its compliance with the reporting requirements of Rule
          144 (at any time from and after ninety days following the effective
          date of the first registration statement filed by the Company for an
          offering of its securities to the general public), and of the
          Securities Act and the Exchange Act (at any time after it has become
          subject to such reporting requirements), a copy of the most recent
          annual or quarterly report of the Company, and such other reports and
          documents so filed as such Holder may reasonably request in availing
          itself of any rule or regulation of the Commission allowing such
          Holder to sell any such securities.

               SECTION 9. TRANSFER OR ASSIGNMENT OF REGISTRATION RIGHTS. The
     rights to cause the Company to register securities under this Agreement may
     be transferred or assigned by each holder in connection with the transfer
     or assignment of any of such Holder's Registrable Securities to another
     Holder, to any affiliate of the assigning Holder or to any person or entity
     acquiring at least 480,000 Registrable Securities (such number being
     subject to adjustment for any stock dividend, stock split, subdivision,
     combination or other recapitalization of the Common Stock of the Company)
     or such lesser number as the Board of Directors may agree in writing,
     PROVIDED that the Company is given written notice by you at the time of or
     within a reasonable time after such transfer or assignment, stating the
     name and address of such transferee or assignee and identifying the
     securities with respect to which such registration rights are being
     transferred or assigned, and PROVIDED, FURTHER, that the transferee or
     assignee of such rights is not deemed by the board of directors of the
     Company, in its reasonable judgment, to be a competitor of the Company; and
     PROVIDED, FURTHER, that the transferee or assignee of such rights agrees in
     writing to be bound by the obligations of such Holder under this Agreement.

               SECTION 10. "MARKET STAND-OFF" AGREEMENT. Each Holder agrees, if
     requested by the Company and an underwriter of Common Stock (or other
     equity securities) of the Company, not to sell or otherwise transfer or
     dispose of any Common Stock (or other equity securities) of the Company
     held by such Holder during the one hundred and eighty-day period following
     the effective date of a registration statement of the Company filed under
     the Securities Act, provided that:

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               (a) such agreement only applies to the first such registration
          statement of the Company including securities to be sold on its behalf
          to the public in an underwritten offering; and

               (b) all Holders, officers and directors and other shareholders of
          the Company holding in excess of 2% of the outstanding Common Stock
          (on an as converted basis) of the Company enter into similar
          agreements.

               Such agreement shall be in writing in a form reasonably
     satisfactory to the Company and such underwriter. Notwithstanding the
     foregoing, the Company may impose stop-transfer instructions with respect
     to the shares (or securities) subject to the foregoing restriction until
     the end of such one hundred and eighty-day period.

               SECTION 11. DEFINITIONS. For purposes of this Agreement, the
     following terms have the meanings set forth below.

               "COMMISSION" shall mean the Securities and Exchange Commission or
     any other federal agency at the time administering the Securities Act.

               "COMMON STOCK" means the Common Stock of the Company as described
     in the Company's Certificate of Incorporation, as amended.

               "HOLDER" shall mean any holder of Registrable Securities.

               "INITIATING HOLDERS" shall mean Holders who own in the aggregate
     more than 50% of either the Series A Registrable Securities or the Series B
     Registrable Securities.

               "IPO" means the initial sale of Common Stock to the public
     pursuant to an underwritten offering registered under the Securities Act.

               "PREFERRED STOCK" means the Company's Series A Preferred Stock,
     par value $.01 per share, and the Company's Series B Preferred Stock, par
     value $.01 per share. For purposes of this Agreement, Preferred Stock shall
     not include any other series of the Company's preferred stock.

               The terms "REGISTER", "REGISTERED" and "REGISTRATION" shall refer
     to a registration effected by preparing and filing a registration statement
     in compliance with the Securities Act and applicable rules and regulations
     thereunder, and the declaration or ordering of the effectiveness of such
     registration statement; provided that such terms shall not be deemed to
     include the registration of shares pursuant to a registration statement on
     Form S-8 or Form S-4, or their successors, or any other form for a similar
     limited purpose, or any registration statement covering only securities
     proposed to be issued in exchange for securities or assets of another
     corporation.

<PAGE>

               "REGISTRABLE SECURITIES" means the Series A Registrable
     Securities and the Series B Registrable Securities.

               "SERIES A REGISTRABLE SECURITIES" means (I) Common Stock issued
     or issuable upon the conversion of the Series A Preferred, and (II) any
     Common Stock issued in respect of securities issued pursuant to the
     conversion of the Series A Preferred upon any stock split, stock dividend,
     recapitalization or similar event; PROVIDED, HOWEVER, that shares of Common
     Stock which are Series A Registrable Securities shall cease to be Series A
     Registrable Securities (a) upon any sale pursuant to a registration
     statement or Rule 144 under the Securities Act, (b) with respect to a
     Holder of Series A Registrable Securities, if all of the Series A
     Registrable Securities held by such Holder may be sold pursuant to Rule
     144(k) under the Securities Act and such Holder holds less than 5% of the
     Company's then outstanding capital stock, and (c) upon any sale in any
     manner to a person or entity which, by virtue of SECTION 10 of this
     Agreement, is not entitled to the rights provided by this Agreement. Series
     A Registrable Securities shall include shares of Common Stock issuable upon
     conversion of the Series A Registrable Securities even if such conversion
     has not yet been effected.

               "SERIES B REGISTRABLE SECURITIES" means (I) Common Stock issued
     or issuable upon the conversion of the Series B Preferred, and (II) any
     Common Stock issued in respect of securities issued pursuant to the
     conversion of the Series B Preferred upon any stock split, stock dividend,
     recapitalization or similar event; PROVIDED, HOWEVER, that shares of Common
     Stock which are Series B Registrable Securities shall cease to be Series B
     Registrable Securities (a) upon any sale pursuant to a registration
     statement or Rule 144 under the Securities Act, (b) with respect to a
     Holder of Series B Registrable Securities, if all of the Series B
     Registrable Securities held by such Holder may be sold pursuant to Rule
     144(k) under the Securities Act and such Holder holds less than 5% of the
     Company's then outstanding capital stock, and (c) upon any sale in any
     manner to a person or entity which, by virtue of SECTION 10 of this
     Agreement, is not entitled to the rights provided by this Agreement. Series
     B Registrable Securities shall include shares of Common Stock issuable upon
     conversion of the Series B Registrable Securities even if such conversion
     has not yet been effected.

               "REGISTRATION EXPENSES" shall mean all expenses incurred by the
     Company in compliance with SECTIONS 1 and 2 hereof, including, without
     limitation, all registration and filing fees, printing expenses, fees and
     disbursements of counsel for the Company, blue sky fees and expenses,
     reasonable fees and disbursements of one counsel for all the selling
     Holders and other security holders, and the expense of any special audits
     incident to or required by any such registration (but excluding the
     compensation of regular employees of the Company, which shall be paid in
     any event by the Company, and Selling Expenses).

               "SECURITIES ACT" means the Securities Act of 1933, as amended, or
     any similar federal law then in force.

               "SELLING EXPENSES" shall mean all underwriting discounts, selling
     commissions and transfer taxes applicable to the sale of Registrable
     Securities and the fees and expenses of a selling Holder's own counsel
     (other than the counsel selected to represent all selling Holders).

<PAGE>

               SECTION 12. TERM. This Agreement shall terminate and be of no
     further force or effect upon the earlier of (i) three years after a
     Qualified Public Offering (as defined in the Purchase Agreement), and (ii)
     when all subject Registrable Securities can be sold under Rule 144 of the
     Securities Act.

               SECTION 13. MISCELLANEOUS.

               (a) NO INCONSISTENT AGREEMENTS. This Agreement amends, restates
     and supercedes the Sections 8.4 through 8.15 of the HarbourVest Agreement
     in its entirety, and the Company's obligations under such Sections of the
     HarbourVest Agreement are hereby terminated. The Company has not entered
     into and shall not hereafter enter into any agreement with respect to its
     securities which is inconsistent with or violates the rights granted to the
     holders of Registrable Securities in this Agreement.

               (b) ADJUSTMENTS AFFECTING REGISTRABLE SECURITIES. The Company
     shall not knowingly take any action, or permit any change to occur, with
     respect to its securities which would materially and adversely affect the
     ability of the holders of Registrable Securities to include such
     Registrable Securities in a registration undertaken pursuant to this
     Agreement or which would adversely affect the marketability of such
     Registrable Securities in any such registration (including, without
     limitation, effecting a stock split or a combination of shares).

               (c) REMEDIES. Any Person having rights under any provision of
     this Agreement shall be entitled to enforce such rights specifically to
     recover damages caused by reason of any breach of any provision of this
     Agreement and to exercise all other rights granted by law. The parties
     hereto agree and acknowledge that money damages may not be an adequate
     remedy for any breach of the provisions of this Agreement and that, in
     addition to any other rights and remedies existing in its favor, any party
     shall be entitled to specific performance and/or other injunctive relief
     from any court of law or equity of competent jurisdiction (without posting
     any bond or other security) in order to enforce or prevent violation of the
     provisions of this Agreement.

               (d) AMENDMENTS AND WAIVERS. Except as otherwise provided herein,
     the provisions of this Agreement may be amended or waived only upon the
     prior written consent of the Company and holders of a majority of the
     Registrable Securities.

               (e) SUCCESSORS AND ASSIGNS. All covenants and agreements in this
     Agreement by or on behalf of any of the parties hereto shall bind and inure
     to the benefit of the respective successors and assigns of the parties
     hereto whether so expressed or not. In addition, whether or not any express
     assignment has been made, the provisions of this Agreement which are for
     the benefit of purchasers or holders of Registrable Securities are also for
     the benefit of, and enforceable by, any subsequent holder of Registrable
     Securities.

<PAGE>

               (f) SEVERABILITY. Whenever possible, each provision of this
     Agreement shall be interpreted in such manner as to be effective and valid
     under applicable law, but if any provision of this Agreement is held to be
     prohibited by or invalid under applicable law, such provision shall be
     ineffective only to the extent of such prohibition or invalidity, without
     invalidating the remainder of this Agreement.

               (g) COUNTERPARTS. This Agreement may be executed simultaneously
     in two or more counterparts in the form attached hereto, any one of which
     need not contain the signatures of more than one party, but all such
     counterparts taken together shall constitute one and the same Agreement.

               (h) DESCRIPTIVE HEADINGS. The descriptive headings of this
     Agreement are inserted for convenience only and do not constitute a part of
     this Agreement.

               (i) GOVERNING LAW. All issues and questions concerning the
     construction, validity, interpretation and enforcement of this Agreement
     and the exhibits and schedules hereto shall be governed by, and construed
     in accordance with, the laws of the State of Delaware, without giving
     effect to any choice of law or conflict of law rules or provisions (whether
     of the State of Delaware or any other jurisdiction) that would cause the
     application of the laws of any jurisdiction other than the State of
     Delaware.

               (j) NOTICES. All notices, demands or other communications to be
     given or delivered under or by reason of the provisions of this Agreement
     shall be in writing and shall be deemed to have been given when delivered
     personally to the recipient, sent to the recipient by reputable overnight
     courier service (charges prepaid) or mailed to the recipient by certified
     or registered mail, return receipt requested and postage prepaid. Such
     notices, demands and other communications shall be sent to each Investor at
     the address indicated on the Schedule of Investors and to the Company and
     counsel for the Company and Investors at the address indicated below:

                   Ulf Arnetz
                   President and CEO
                   Corechange, Inc.
                   260 Franklin Street, Suite 1890
                   Boston, Massachusetts  02100

                   with a copy to (which shall not constitute notice hereunder):

                   Hale and Dorr LLP
                   60 State Street
                   Boston, Massachusetts 02109
                   Attention:       Stuart M. Falber
                   Telecopy No:  (617) 526-5000

<PAGE>

                   Kirkland & Ellis
                   200 East Randolph Drive
                   Chicago, Illinois 60601
                   Attention:       Gary R. Silverman
                   Telecopy No:     (312) 861-2200

     or to such other address or to the attention of such other person as the
     recipient party has specified by prior written notice to the sending party.

                                    * * * * *

               IN WITNESS WHEREOF, the parties have executed this Agreement as
     of the date first written above.

     THE COMPANY:                            CORECHANGE, INC.

                                             By:  /S/ ULF ARNETZ
                                                -------------------------------

                                             Its:  PRESIDENT / CEO
                                                 ------------------------------

     HARBOURVEST:                            HARBOURVEST VENTURE PARTNERS V -
                                             DIRECT FUND L.P.

                                             By:
                                                -------------------------------

                                             Its:
                                                 ------------------------------

<PAGE>

                              SCHEDULE OF INVESTORS

<PAGE>

                                Corechange, Inc.
           Schedule of Series B Preferred Convertible Bridge Financing

<TABLE>
<CAPTION>

                                        Date of    Interest till     Daily    Principal  # of Series B
Name                          Amount    Deposit      2/18/00       Interest  + Interest    Pref Shares               Address
                             --------   --------   -------------   --------  -----------   --------                  --------
<S>                         <C>         <C>        <C>             <C>         <C>          <C>       <C>

HarbourVest Partners LLC   $  500,000    11/2/99    $ 11,945.21    $ 109.59    $ 511,945     87,707   One Financial Center Boston
Ulf Arnetz                 $  250,000    11/2/99    $  5,972.60       54.79    $ 255,973     43,853   260 Franklin St Boston
Torbjorn Karlsson          $  250,000    11/2/99    $  5,972.60       54.79    $ 255,973     43,853   c/o Corechange Svenska,
                                                                                                        Stockholm
Breviksgruppen AB          $  100,000   12/29/99    $  1,139.73       21.92    $ 101,140     17,327   Birger Jarlsgatan 2,
                                                                                                        114 32 Stockholm
Minvest AB                 $  120,000   12/29/99    $  1,367.67       26.30    $ 121,368     20,793   Neglinge Center,
                                                                                                        133 33 Saltsjobaden
Henrik Ingvarsson          $   25,000   12/29/99    $    284.93        5.48    $  25,285      4,332   Vikingagatan 27,
                                                                                                        113 42 Stockholm
Andreas Nyberg             $   13,000   12/29/99    $    148.16        2.85    $  13,148      2,253   Fleminggatan 56,
                                                                                                        112 45 Stockholm
Dan Segenmark              $  120,000   12/29/99    $  1,367.67       26.30    $ 121,368     20,793   Kistavagen 14,
                                                                                                        192 67 Sollentuna
Lars Ahlstrom              $   50,000   12/29/99    $    569.86       10.96    $  50,570      8,664   Bergsjoholm,
                                                                                                        271 91 Ystad
Jan Khilberg               $  120,000   12/29/99    $  1,367.67       26.30    $ 121,368     20,793   Engelbrektsgatan 18,
                                                                                                        5 Tr, 114 32 Stockholm
Andreas Segenmark          $  120,000   12/29/99    $  1,367.67       26.30    $ 121,368     20,793   Borgvagen 21,
                                                                                                        192 55 Sollentuna
Svensk Vininformation AB   $   50,000   12/29/99    $    569.86       10.96    $  50,570      8,664   Box 9175, 102 73 Stockholm
J O Hersler Consulting AB  $   20,000   12/29/99    $    227.95        4.38    $  20,228      3,465   Engelbrektsgatan 39,
                                                                                                        3 tr, 114 32 Stockholm
Sofie Emilsson             $   50,000   12/29/99    $    569.86       10.96    $  50,570      8,664   Radmansgatan 84,
                                                                                                        113 29 Stockholm
Rosebud Corporation        $  300,000   12/29/99    $  3,419.18       65.75    $ 303,419     51,982   C/O Jean Paul Le Grand,
                                                                                                        37 39 Avenue Dumas, Geneva
                                                                                                        Switzerland
Robert Friberg             $  200,000   12/29/99    $  2,279.45       43.84    $ 202,279     34,655   Sockenvagen 141,
                                                                                                        132 46 Stockholm
Svensk Vininformation AB   $   40,000   12/29/99    $    455.89        8.77   $   40,456      6,931   Box 9175, 102 73 Stockholm
Andreas Strindholm         $   10,000   12/29/99    $    113.97        2.19   $   10,114      1,733   Ballonggatan 21, 169 71 Solna
Per Sahlestrom             $   20,000   12/29/99    $    227.95        4.38   $   20,228      3,465   Bromma Kyrkvag 448,
                                                                                                        168 58 Bromma
Jan Matsson                $   18,000   12/29/99    $    205.15        3.95   $   18,205      3,119   Palsundsgatan 6,
                                                                                                        117 31 Stockholm
Harald Mattson Marn        $   58,500   12/29/99    $    666.74       12.82   $   59,167     10,136   Styrmansgatan 24,
                                                                                                        114 54 Stockholm
Carl Mattson Marn          $   58,500   12/29/99    $    666.74       12.82   $   59,167     10,136   Styrmansgatan 24,
                                                                                                        114 54 Stockholm
Hans Bjurklint             $   35,000   12/29/99    $    398.90        7.67   $   35,399      6,065   Skapparp, 310 40 Harplinge
Rikard svensson            $  150,000   12/29/99    $  1,709.59       32.88   $  151,710     25,991   Herrgardsgatan 2 A,
                                                                                                        722 13 Vasteras
Fredrik Svensson           $  150,000   12/29/99    $  1,709.59       32.88   $  151,710     25,991   Skeppsgatan 1, 721 32 Vasteras
Matz Borsch                $  100,000   12/29/99    $  1,139.73       21.92   $  101,140     17,327   Tornbrinken 6,
                                                                                                        132 36 Saltsjo-Boo
Bjorn von Malmborg         $  143,000   12/29/99    $  1,629.81       31.34   $  144,630     24,778   Camino Alto, 108 La Moraleja,
                                                                                                        28109 Al Cobendas(Mardrid)
                                                                                                        Spanien
Hans Jacobsson             $   81,000   12/29/99    $    923.18       17.75   $   81,923     14,035   Kiviksgatan 13, 168 54 Bromma
Adam Dahlberg              $  115,000   12/29/99    $  1,310.68       25.21   $  116,311     19,926   Riddargatan 15,
                                                                                                         114 57 Stockholm
Stina Linden               $   20,000    1/27/00    $    100.82        4.38   $   20,101      3,444   Baltvagen 7, 191 33 Sollentuna
Ulf Oster                  $   20,000    1/27/00    $    100.82        4.38   $   20,101      3,444   Skogsfrugrand 33,
                                                                                                        167 62 Bromma
Erik Ekberg                $   15,000    1/27/00    $     75.62        3.29   $   15,076      2,583   Strandvagen 57,
                                                                                                        115 23 Stockholm
Strom & Partners           $   45,000    1/27/00    $    226.85        9.86   $   45,227      7,748   Strom & Partners, P O Box 775,
                                                                                                         8024 Zurich, Switzerland
Richard Hellberg           $   16,000    2/7/00     $     42.08        3.51   $   16,042      2,748   Engelbrektsgatan 23,
                                                                                                        114 23 Stockholm
                           $3,383,000               $    50,274        $741   $3,433,274    588,192

<CAPTION>

Direct Investors in the Series B
--------------------------------
<S>                         <C>         <C>        <C>             <C>         <C>          <C>       <C>

Harbourvest Capital        $1,500,000                                                       256,981   One Financial Center,
                                                                                                       44th Floor, Boston, MA 02111
ABN AMRO Capital (USA)
 Inc.                      $4,000,000                                                       685,284   208 South LaSalle Street,
                                                                                                        10th Floor, Chicago, IL
                                                                                                        60604
Xcelera.com                $3,500,000                                                       599,623   Ugland House, South Church
                                                                                                         Street, Grand Cayman,
                                                                                                          Cayman Island, British
                                                                                                           West Imdies
Xcelera.com                $5,000,000                                                       856,604   Ugland House, South Church
                                                                                                        Street, Grand Cayman,
                                                                                                        Cayman Island,
                                                                                                        British West Imdies
Ronald Hirsch                 $25,000                                                         4,283   223 North Guadalupe,
                                                                                                        PMB # 153, Santa Fe, NM
                                                                                                         87501
UK Private Investors
AIB Nominees                  $75,000                                                        12,849   AIB Nominees, Allied Irish
                                                                                                        Bank House, P.O. Box 468,
                                                                                                        Grenville Street,
                                                                                                        St. Hellier, Jersey JE 8WT,
                                                                                                        Channel Islands
Marquis Limited               $50,000                                                         8,566   Mr. Brad Walmsley,
                                                                                                        VP Cititrust Switzerland,
                                                                                                        62 Rue du Rhone,
                                                                                                        PO BOAX 3946, CH-1211,
                                                                                                        Geneva 3, Switzerland
Ms. Caroline Kauslick Coombs  $50,000                                                         8,566   23 York Avenue, East Sheen,
                                                                                                        London, SW14, 7LQ, UK
Mr. Phelim Greene             $25,000                                                         4,283   72 Leopardstown Ave.,
                                                                                                        Blackrock, Co. Dublin,
                                                                                                        Ireland
Mr. Donal Greene              $32,000                                                         5,482   Treetops, 114 Roebuck Road,
                                                                                                        Clonskeagh, Dublin 14,
                                                                                                        Ireland
Mr. Kevin MacNally            $25,000                                                         4,283   3 Ailesbury Way, Ailesbury
                                                                                                        Road, Dublin 4, Ireland
Mrs. Niamh McGowan            $25,000                                                         4,283   Smurfit Print, 33 Botanic
                                                                                                        Road, Glasnevin, Dublin 9,
                                                                                                        Ireland
Ms. Margaret Kennedy          $43,750                                                         7,495   9 Ashurst College Road,
                                                                                                        Kilkenny, Co. Kilkenny,
                                                                                                        Ireland
Total Direct Series B
 Preferred I              $14,350,750                                                     2,458,583
Total Converted + Direct
 Investor                 $17,733,750                                                     3,046,775

</TABLE>

<PAGE>

                        FORM OF PURCHASER SIGNATURE PAGE

<PAGE>

                            PURCHASER SIGNATURE PAGE

     By its execution and delivery of this signature page, the undersigned
Purchaser hereby joins in and agrees to be bound by the terms and conditions of
(i) the Series B Convertible Preferred Stock Purchase Agreement dated as of
February 18, 2000 (the "Series B Purchase Agreement") by and among Corechange,
Inc. ("Corechange") and the Purchasers (as defined therein), as to the number of
shares of Series B Convertible Preferred Stock set forth below, (ii) the Amended
and Restated Stockholders Agreement dated as of February 18, 2000 (the
"Stockholders Agreement") by and among Corechange and the Stockholders (as
defined therein) as a "Stockholder" thereunder, and (iii) the Registration
Agreement dated as of February 18, 2000, (the "Registration Agreement") by and
among Corechange and the Holders (as defined therein) as a "Holder" thereunder,
and authorizes this signature page to be attached to the Series B Agreement, the
Stockholders Agreement (as defined therein) as a as a "Holder" thereunder, and
authorizes this signature page to be attached to the Series B Agreement, the
Stockholders Agreement and the Registration Agreement or counterparts thereof.

                                 Name of Purchaser

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

                                 By:
                                    Title:

                                 Record
                                 Address:
                                         ----------------------------

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

                                 Telecopy No.:
                                              -----------------------

                                 Number of Shares:
                                                  -------------------

                                 Aggregate purchase price:

                                 $--------------

Agreed and accepted this
___day of _________, 2000

CORECHANGE, INC.

By:  _____________________
         Title:

             PLEASE COMPLETE, SIGN AND RETURN AS SOON AS POSSIBLE BY
        TELECOPY, WITH THE ORIGINAL THEN SENT BY OVERNIGHT COURIER, TO:

                             STUART M. FALBER, ESQ.
                                Hale and Dorr LLP
                                 60 State Street
                                Boston, MA 02109
                                Tel: 617-526-6663
                                Tel: 617-526-5000<PAGE>

                                                                    EXHIBIT 10.6

                               MEMBERS' AGREEMENT

     MEMBERS' AGREEMENT (this "AGREEMENT") dated as of February 7, 1997 by and
among CoreChange, LLC, a Delaware limited liability company (the "Company"), and
the persons listed as Members in the signature pages hereto (collectively, the
"MEMBERS" and individually, a "MEMBER").

     In consideration of the agreements set forth below, the interests of the
Company and its present and future Members, the parties hereby agree with each
other as follows:

     1. CERTAIN DEFINED TERMS. As used in this Agreement, the following terms
shall have the following respective meanings:

     "UNITS" shall mean and include all Class A Units, and all other securities
of the Company which may be issued in exchange for or in respect of Class A
Units;

     "CLASS A UNITS" include all such units now owned or hereafter acquired by
any Member;

     "COMMISSION" shall mean the Securities and Exchange Commission, or any
other federal agency at the time administering the Securities Act;

     "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, as amended,
or any similar federal statute, and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time; and

     "SECURITIES ACT" shall mean the Securities Act of 1933, as amended, or any
similar federal statute, and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

     2. INCIDENTAL REGISTRATION. If the Company at any time (other than pursuant
to Section 3) proposes to register any of its securities under the Securities
Act for sale to the public, whether for its own account or for the account of
other securityholders or both (except with respect to registration statements on
Forms S-4, S-8 or another form not available for registering the securities held
by the Members for sale to the public), each such time it will give written
notice to all Members of its intention to do so. Upon the written request of any
such Member, received by the Company within 30 days after the giving of any such
notice by the Company, to register any of its securities, the Company will use
its best efforts to cause the securities as to which registration shall have
been so requested to be included in the securities to be covered by the
registration statement proposed to be filed by the Company, all to the extent
requisite to permit the sale or other disposition by the holder of such
securities so registered. In the event that any registration pursuant to this
Section 2 shall be, in whole or in part, an underwritten public offering of
common stock, the number of shares to be included in such an underwriting may be
reduced (pro rata among the requesting Members based upon the number of
securities owned by such Members) if and to the extent that the managing
underwriter shall be of the opinion that such inclusion would adversely affect
the marketing of the securities to be sold by the Company therein, provided
however, that such number of shares shall not be reduced if any

<PAGE>

shares are to be included in such underwriting for the account of any person
other than the Company or requesting Members.

     3. REGISTRATION ON FORM S-3. (a) If at any time (i) a Member or Members
request that the Company file a registration statement on Form S-3 or any
successor thereto for a public offering of all or any portion of the securities
held by such requesting Member or Members, the reasonably anticipated aggregate
price of securities to the public of which would exceed $ 1,000,000, and (ii)
the Company is a registrant entitled to use Form S-3 or any successor thereto to
register such securities, then the Company shall use its best efforts to
register under the Securities Act on Form S-3 or any successor thereto, for
public sale in accordance with the method of disposition specified in such
notice, the number of securities specified in such notice.

          (b) Following receipt of any notice under this Section 3, the Company
shall immediately notify all Members from whom notice has not been received and
shall use its best efforts to register under the Securities Act, for public sale
in accordance with the method of disposition specified in such notice from
requesting holders, the number of securities specified in such notice (and in
all notices received by the Company from other Members within 30 days after the
giving of such notice by the Company). If such method of disposition shall be an
underwritten public offering, the holders of a majority of the shares of common
stock to be sold in such offering may designate the managing underwriter of such
offering, subject to the approval of the Company, which approval shall not be
unreasonably withheld or delayed.

          (c) The Company shall be entitled to include in any registration
statement referred to in this Section 3, for sale in accordance with the method
of disposition specified by the requesting holders, securities to be sold by the
Company for its own account, except as and to the extent that, in the opinion of
the managing underwriter (if such method of disposition shall be an underwritten
public offering), such inclusion would adversely affect the marketing of the
securities to be sold. Except for registration statements on Form S-4, S-8 or
any successor thereto, the Company will not file with the Commission any other
registration statement with respect to its Common Stock, whether for its own
account or that of other stockholders, from the date of receipt of a notice from
requesting holders pursuant to this Section 3 until the completion of the period
of distribution of the registration contemplated thereby.

     4. REGISTRATION PROCEDURES. If and whenever the Company is required by the
provisions of Section 3 to use its best efforts to effect a registration under
the Securities Act, the Company will, as expeditiously as possible:

          (a) prepare and file with the Commission a registration statement with
respect to such securities and use its best efforts to cause such registration
statement to become and remain effective for the period of the distribution
contemplated thereby (determined as hereinafter provided);

          (b) prepare and file with the Commission such amendments and
supplements to such registration statement and the prospectus used in connection
therewith as may be necessary to keep such registration statement effective for
the period specified in paragraph (a) above and comply with the provisions of
the Securities Act with respect to the disposition of all

                                       2
<PAGE>

securities covered by such registration statement in accordance with the
sellers' intended method of disposition set forth in such registration statement
for such period;

          (c) furnish to each seller of securities and to each underwriter such
number of copies of the registration statement and the prospectus included
therein (including each preliminary prospectus) as such persons reasonably may
request in order to facilitate the public sale or other disposition of the
securities covered by such registration statement;

          (d) use its best efforts to register or qualify the securities covered
by such registration statement under the securities or "blue sky" laws of such
jurisdictions as the sellers of securities or, in the case of an underwritten
public offering, the managing underwriter reasonably shall request, PROVIDED,
HOWEVER, that the Company shall not for any such purpose be required to qualify
generally to transact business as a foreign corporation in any jurisdiction
where it is not so qualified or to consent to general service of process in any
such jurisdiction;

          (e) use its best efforts to list the securities covered by such
registration statement with any securities exchange on which the Common Stock of
the Company is then listed;

          (f) immediately notify each seller of securities and each underwriter
under such registration statement, at any time when a prospectus relating
thereto is required to be delivered under the Securities Act, of the happening
of any event of which the Company has knowledge as a result of which the
prospectus contained in such registration statement, as then in effect, includes
an untrue statement of a material fact or omits to state a material fact
required to be stated therein or necessary to make the statements therein not
misleading in light of the circumstances then existing;

          (g) if the offering is underwritten and at the request of any seller
of securities, use its best efforts to furnish on the date that securities are
delivered to the underwriters for sale pursuant to such registration: (i) an
opinion dated such date of counsel representing the Company for the purposes of
such registration, addressed to the underwriters and to such seller, stating
that such registration statement has become effective under the Securities Act
and that (A) to the best knowledge of such counsel, no stop order suspending the
effectiveness thereof has been issued and no proceedings for that purpose have
been instituted or are pending or contemplated under the Securities Act, (B) the
registration statement, the related prospectus and each amendment or supplement
thereof comply as to form in all material respects with the requirements of the
Securities Act (except that such counsel need not express any opinion as to
financial statements contained therein) and (C) to such other effects as
reasonably may be requested by counsel for the underwriters or by such seller or
its counsel and (ii) a letter dated such date from the independent public
accountants retained by the Company, addressed to the underwriters and to such
seller, stating that they are independent public accountants within the meaning
of the Securities Act and that, in the opinion of such accountants, the
financial statements of the Company included in the registration statement or
the prospectus, or any amendment or supplement thereof, comply as to form in all
material respects with the applicable accounting requirements of the Securities
Act, and such letter shall additionally cover such other financial matters
(including information as to the period ending no more than five business days

                                       3
<PAGE>

prior to the date of such letter) with respect to such registration as such
underwriters reasonably may request; and

          (h) make available for inspection by each seller of securities, any
underwriter participating in any distribution pursuant to such registration
statement, and any attorney, accountant or other agent retained by such seller
or underwriter, all financial and other records, pertinent corporate documents
and properties of the Company, and cause the Company's officers, directors and
employees to supply all information reasonably requested by any such seller,
underwriter, attorney, accountant or agent in connection with such registration
statement.

          For purposes of Section 4(a) and 4(b) and of Section 3(c), the period
of distribution of securities in a firm commitment underwritten public offering
shall be deemed to extend until each underwriter has completed the distribution
of all securities purchased by it, and the period of distribution of securities
in any other registration shall be deemed to extend until the earlier of the
sale of all securities covered thereby and 120 days after the effective date
thereof.

          In connection with each registration hereunder, the sellers of
securities will furnish to the Company in writing such information with respect
to themselves and the proposed distribution by them as reasonably shall be
necessary in order to assure compliance with federal and applicable state
securities laws.

          In connection with each registration pursuant to Sections 2 or 3
covering an underwritten public offering, the Company and each seller agree to
enter into a written agreement with the managing underwriter selected in the
manner herein provided in such form and containing such provisions as are
customary in the securities business for such an arrangement between such
underwriter and companies of the Company's size and investment stature.

     5. EXPENSES. All expenses incurred by the Company in complying with
Sections 2 and 3, including, without limitation, all registration and filing
fees, printing expenses, fees and disbursements of counsel and independent
public accountants for the Company, fees and expenses (including counsel fees)
incurred in connection with complying with state securities or "blue sky" laws,
fees of the National Association of Securities Dealers, Inc., transfer taxes,
fees of transfer agents and registrars, costs of insurance and fees and
disbursements of one counsel for the Members, but excluding any Selling
Expenses, are called "REGISTRATION EXPENSES". All underwriting discounts and
selling commissions applicable to the sale of securities are called "SELLING
EXPENSES".

          The Company will pay all Registration Expenses in connection with each
registration statement under Sections 2 or 3. All Selling Expenses in connection
with each registration statement under Sections 2 or 3 shall be borne by the
participating sellers in proportion to the number of securities sold by each, or
by such participating sellers other than the Company (except to the extent the
Company shall be a seller) as they may agree.

     6. INDEMNIFICATION AND CONTRIBUTION. (a) In the event of a registration of
any of the securities under the Securities Act pursuant to Sections 2 or 3, the
Company will indemnify and

                                       4
<PAGE>

hold harmless each seller of such securities thereunder, each underwriter of
such securities thereunder and each other person, if any, who controls such
seller or underwriter within the meaning of the Securities Act, against any
losses, claims, damages or liabilities, joint or several, to which such seller,
underwriter or controlling person may become subject under the Securities Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any registration statement
under which such securities were registered under the Securities Act pursuant to
Sections 2 or 3, any preliminary prospectus or final prospectus contained
therein, or any amendment or supplement thereof, or arise out of or are based
upon the omission or alleged omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
and will reimburse each such seller, each such underwriter and each such
controlling person for any legal or other expenses reasonably incurred by them
in connection with investigating or defending any such loss, claim, damage,
liability or action, PROVIDED, HOWEVER, that the Company will not be liable in
any such case if and to the extent that any such loss, claim, damage or
liability arises out of or is based upon an untrue statement or alleged untrue
statement or omission or alleged omission so made in conformity with information
furnished by any such seller, any such underwriter or any such controlling
person in writing specifically for use in such registration statement or
prospectus.

          (b) In the event of a registration of any securities under the
Securities Act pursuant to Sections 2 or 3, each seller of such securities
thereunder, severally and not jointly, will indemnify and hold harmless the
Company, each person, if any, who controls the Company within the meaning of the
Securities Act, each officer of the Company who signs the registration
statement, each director of the Company, each underwriter and each person who
controls any underwriter within the meaning of the Securities Act, against all
losses, claims, damages or liabilities, joint or several, to which the Company
or such officer, director, underwriter or controlling person may become subject
under the Securities Act or otherwise, insofar as such losses, claims, damages
or liabilities (or actions in respect thereof) arise out of or are based upon
any untrue statement or alleged untrue statement of any material fact contained
in the registration statement under which such securities was registered under
the Securities Act pursuant to Sections 2 or 3, any preliminary prospectus or
final prospectus contained therein, or any amendment or supplement thereof, or
arise out of or are based upon the omission or alleged omission to state therein
a material fact required to be stated therein or necessary to make the
statements therein not misleading, and will reimburse the Company and each such
officer, director, underwriter and controlling person for any legal or other
expenses reasonably incurred by them in connection with investigating or
defending any such loss, claim, damage, liability or action, PROVIDED, HOWEVER,
that such seller will be liable hereunder in any such case if and only to the
extent that any such loss, claim, damage or liability arises out of or is based
upon an untrue statement or alleged untrue statement or omission or alleged
omission made in reliance upon and in conformity with information pertaining to
such seller, as such, furnished in writing to the Company by such seller
specifically for use in such registration statement or prospectus, and PROVIDED,
FURTHER, HOWEVER, that the liability of each seller hereunder shall be limited
to the proportion of any such loss, claim, damage, liability or expense which is
equal to the proportion that the public offering price of the shares sold by
such seller under such registration statement bears to the total public offering
price of all securities sold thereunder, but not in any event to exceed the
proceeds received by such seller from the sale of securities covered by such
registration statement.

                                       5
<PAGE>

          (c) Promptly after receipt by an indemnified party hereunder of notice
of the commencement of any action, such indemnified party shall, if a claim in
respect thereof is to be made against the indemnifying party hereunder, notify
the indemnifying party in writing thereof, but the omission so to notify the
indemnifying party shall not relieve it from any liability which it may have to
such indemnified party other than under this Section 6 and shall only relieve it
from any liability which it may have to such indemnified party under this
Section 6 if and to the extent the indemnifying party is prejudiced by such
omission. In case any such action shall be brought against any indemnified party
and it shall notify the indemnifying party of the commencement thereof, the
indemnifying party shall be entitled to participate in and, to the extent it
shall wish, to assume and undertake the defense thereof with counsel
satisfactory to such indemnified party, and, after notice from the indemnifying
party to such indemnified party of its election so to assume and undertake the
defense thereof, the indemnifying party shall not be liable to such indemnified
party under this Section 6 for any legal expenses subsequently incurred by such
indemnified party in connection with the defense thereof other than reasonable
costs of investigation and of liaison with counsel so selected, PROVIDED,
HOWEVER, that, if the defendants in any such action include both the indemnified
party and the indemnifying party and the indemnified party shall have reasonably
concluded that there may be reasonable defenses available to it which are
different from or additional to those available to the indemnifying party or if
the interests of the indemnified party reasonably may be deemed to conflict with
the interests of the indemnifying party, the indemnified party shall have the
right to select a separate counsel and to assume such legal defenses and
otherwise to participate in the defense of such action, with the expenses and
fees of such separate counsel and other expenses related to such participation
to be reimbursed by the indemnifying party as incurred.

          (d) In order to provide for just and equitable contribution to joint
liability under the Securities Act in any case in which either (i) any Member
exercising rights under this Agreement, or any controlling person of any such
holder, makes a claim for indemnification pursuant to this Section 6 but it is
judicially determined (by the entry of a final judgment or decree by a court of
competent jurisdiction and the expiration of time to appeal or the denial of the
last right of appeal) that such indemnification may not be enforced in such case
notwithstanding the fact that this Section 6 provides for indemnification in
such case, or (ii) contribution under the Securities Act may be required on the
part of any such selling Member or any such controlling person in circumstances
for which indemnification is provided under this Section 6; then, and in each
such case, the Company and such holder will contribute to the aggregate losses,
claims, damages or liabilities to which they may be subject (after contribution
from others) in such proportion so that such holder is responsible for the
portion represented by the percentage that the public offering price of its
securities offered by the registration statement bears to the public offering
price of all securities offered by such registration statement, and the Company
is responsible for the remaining portion; PROVIDED, HOWEVER, that, in any such
case, (A) no such holder will be required to contribute any amount in excess of
the public offering price of all such securities offered by it pursuant to such
registration statement; and (B) no person or entity guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
will be entitled to contribution from any person or entity who was not guilty of
such fraudulent misrepresentation.

     7. RIGHT TO PARTICIPATE IN SALE OF ADDITIONAL SECURITIES. The Company
hereby covenants and agrees that it shall not issue or sell any (i) units of the
Company, (ii) bonds,

                                       6
<PAGE>

certificates of indebtedness, debentures or other securities convertible into or
carrying any rights to purchase units of the Company, or (iii) options, warrants
or other rights to subscribe for, purchase or otherwise acquire any units of the
Company unless the Company first submits a written offer to the Members to
permit them to purchase their proportionate share of such units or securities on
terms and conditions, including price, not less favorable to the Members than
those offered by such other prospective purchaser. Each member shall have the
right to elect to purchase up to its proportionate share of such units or
securities based on the ratio which the, units of the Company owned by the
Member or obtainable by said Member upon exercise of the Warrant bears to all
the issued and outstanding units of the Company. The Company's offer to the
Members shall remain open and irrevocable for a period of fifteen (15) days. Any
units or securities offered to the Members pursuant to this Section 7 which such
Members have not elected to purchase within the time fixed herein may, within
one hundred and twenty (120) days after the date for making such election, be
sold by the Company at not less than the same price and upon terms not
materially less favorable to the Company than were offered to the Members but
may not otherwise be sold without renewed compliance with this Section 7.

     8. SPECIFIC ENFORCEMENT. Each Member expressly agrees that the other
Members and the Company will be irreparably damaged if this Agreement is not
specifically enforced. Upon a breach or threatened breach of the terms,
covenants and/or conditions of this Agreement by a Member, the other Members and
the Company shall, in addition to all other remedies, each be entitled to a
temporary or permanent injunction, without showing any actual damage, and/or a
decree for specific performance, in accordance with the provisions hereof.

     9. NOTICES. Notices given hereunder shall be deemed to have been duly given
on the date of personal delivery, on the date of postmark if mailed by certified
or registered mail, return receipt requested, or on the date sent by telecopier
or telex to the party being notified at his or its address specified on the
applicable signature page hereto or such other address as the addressee may
subsequently notify the other parties of in writing.

     10. ENTIRE AGREEMENT AND AMENDMENTS. This Agreement constitutes the entire
agreement of the parties with respect to the subject matter hereof and neither
this Agreement nor any provision hereof may be waived, modified, amended or
terminated except by a written agreement signed by the parties hereto. Members
owning at least a majority of the Units may effect any such waiver,
modification, amendment or termination of this Agreement on behalf of all
Members PROVIDED, HOWEVER, that no such waiver, modification, amendment or
termination may be made which in any way prejudices or alters the rights of Ulf
Arnetz without the prior written consent of Ulf Arnetz. Except for the Limited
Liability Company Agreement dated March 14, 1996 by and among the Company and
the persons named therein (the "LLC Agreement"), the terms of which shall have
precedence over any term or provision of this Agreement that conflicts or is
inconsistent with the terms or provisions of the LLC Agreement, to the extent
any term or other provision of any other indenture, agreement or instrument by
which any party hereto is bound conflicts with this Agreement, this Agreement
shall have precedence over such conflicting term or provision.

     11. GOVERNING LAW; SUCCESSORS AND ASSIGNS. This Agreement shall be governed
by the internal laws of the Commonwealth of Massachusetts and shall be binding
upon the heirs, personal representatives, executors, administrators, successors
and assigns of the parties.

                                       7
<PAGE>

     12. WAIVERS. No waiver of any breach or default hereunder shall be
considered valid unless in writing, and no such waiver shall be deemed a waiver
of any subsequent breach or default of the same or similar nature.

     13. SEVERABILITY. If any provision of this Agreement shall be held to be
illegal, invalid or unenforceable, such illegality, invalidity or
unenforceability shall attach only to such provision and shall not in any manner
affect or render illegal, invalid or unenforceable any other provision of this
Agreement, and this Agreement shall be carried out as if any such illegal,
invalid or unenforceable provision were not contained herein.

     14. CAPTIONS. Captions are for convenience only and are not deemed to be
part of this Agreement.

     15. COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

     IN WINTESS WHEREOF, this Agreement has been executed as of the date and
year first above written.

                              THE COMPANY:

                              CORECHANGE, LLC

                              By: /S/ ULF ARNETZ
                                 -------------------------------------------
                                 Ulf Arnetz, President

                              Address: 260 Franklin Street, Suite 1890
                                       Boston, MA 02110

                              MEMBERS:

                             /S/ ULF ARNETZ
                             -----------------------------------------------
                             Ulf Arnetz

                             Address: 44 WHITING ROAD
                                      WELLESLEY, MA 02181

                             /S/ MONA ARNETZ
                             -----------------------------------------------
                             Mona Arnetz

                             Address: 44 WHITING ROAD
                                      WELLESLEY, MA 02181

                             CAMBRIDGE TECHNOLOGY PARTNERS (MASSACHUSETTS), INC.

                                       8
<PAGE>

                             By: /S/ JAMES P. O'HARE
                                 -------------------
                                 James P. O'Hare, Senior Vice President

                             Address: 304 Vassar Street
                                      Cambridge. MA 02139

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