Document:

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                                                                    Exhibit 10.6

                       FORM OF TAX ALLOCATION AGREEMENT
                       --------------------------------

     This Tax Allocation Agreement (this "Agreement") is entered into as of
______________, 2000 by and between Arthur D. Little, Inc., a Massachusetts
corporation, and c-quential, Inc., a Delaware corporation.

     WHEREAS, the execution and delivery of this Agreement is a condition to the
transactions contemplated by the Reorganization Agreement dated as of
_______________, 2000 by and among Arthur D. Little, Inc., c-quential, Inc. and
other parties thereto (the "Reorganization Agreement");

     NOW, THEREFORE, in consideration of the mutual promises and agreements set
forth herein, and other valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto agree as follows:

SECTION 1.  DEFINITIONS.
            -----------

     Section 1.1  Defined Terms.  For purposes of this Agreement, the following
                  -------------
terms shall have the following meanings.

     "Affiliated Group" means an affiliated group within the meaning of Section
1504(a) of the Code.

     "Ancillary Agreement" shall have the meaning given to such term in the
Reorganization Agreement, excluding this Agreement.

     "ADL Affiliated Group" means Parent and all other corporations that may now
or from time to time hereafter constitute an Affiliated Group with Parent as the
Common Parent.

     "Code" means the Internal Revenue Code of 1986, as amended.

     "Combined Return" means any Return (other than a Consolidated Return) that
is filed on a consolidated, combined or unitary basis (including any state,
local, or foreign Return filed on such basis) that includes at least one Parent
Subsidiary and one Sub Subsidiary.

     "Combined Tax" means any Tax reported on a Combined Return.

     "Combined Utilized Tax Benefit" means, for any period reported on a
Combined Return, the reduction (if any) in Combined Taxes resulting from the use
by the group of entities included in such Combined Return of any credits,
deductions, losses or other items attributable to the Sub Subsidiaries that
could not be used to reduce the Hypothetical Combined Tax or increase the
Hypothetical Combined Refund for such period or any prior period reported on a
Combined Return.

     "Common Parent" means the common parent, within the meaning of Section
1504(a) of the Code, of an Affiliated Group.
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     "Consolidated Return" means the Federal Income Tax Return of the ADL
Affiliated Group for any Consolidated Return Year.

     "Consolidated Return Year" means any taxable year (i) during any part of
which Sub is a member of the ADL Affiliated Group, and (ii) with respect to
which the ADL Affiliated Group files a consolidated Federal Income Tax Return
under Section 1501 of the Code.

     "Consolidated Tax" means any Tax reported on a Consolidated Return.

     "Effective Date" shall have the meaning given to such term in the
Reorganization Agreement.

     "Estimated Payment Date" means any date in a Consolidated Return Year upon
which the ADL Affiliated Group is required to make a payment of estimated
Federal Income Tax.

     "Federal Income Tax" means any Tax imposed by Subtitle A of the Code.

     "Federal Income Tax Return" means a Return filed with respect to Federal
Income Taxes.

     "Federal Utilized Tax Benefit" means, for any Consolidated Return Year, the
reduction (if any) in Consolidated Taxes resulting from the use by the ADL
Affiliated Group of any credits, deductions, losses or other items attributable
to the Sub Group that could not be used to reduce the Hypothetical Federal Tax
or increase the Hypothetical Federal Refund for such Consolidated Return Year or
any prior Consolidated Return Year.

     "Hypothetical Combined Tax" and "Hypothetical Combined Refund" are defined
in Section 5.

     "Hypothetical Federal Tax" and "Hypothetical Federal Refund" are defined in
Section 4.

     "Independent Director" with respect to Sub, shall mean a member of the Sub
Board of Directors who is not an employee or officer of Sub or an officer,
employee or director of Parent or a member of the Parent Group, and with respect
to Parent, shall mean a member of the Parent Board of Directors who is not an
employee or officer of Parent or a member of the Parent Group.

     "Parent" means Arthur D. Little, Inc., a Massachusetts corporation, or any
successor thereto.

     "Parent Group" means the ADL Affiliated Group excluding the Sub Group.

     "Parent Subsidiary" means Parent or any entity in which Parent holds a
direct or indirect interest, excluding all Sub Subsidiaries.

     "Reorganization Agreement" is defined in the recitals to this Agreement.

     "Reorganization Tax" means any Tax imposed upon any Parent Subsidiary or
Sub Subsidiary with respect to the Reorganization Transaction, including but not
limited to any transfer Tax and any Tax imposed on realized gain.

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     "Reorganization Tax Benefit" means the excess of (i) the Total Sub Taxes
that would be incurred if the Reorganization Transaction were treated as giving
rise to no Reorganization Tax over (ii) the Total Sub Taxes actually incurred.
Whenever the Reorganization Tax Benefit is calculated, each of the amounts
referred to in clauses (i) and (ii) of the preceding sentence shall be such
amounts as of the date of the calculation.

     "Reorganization Transaction" means all of the transactions contemplated in
the Reorganization Agreement and Ancillary Agreements considered collectively,
excluding transactions contemplated in the Corporate Services Agreement, the
Registration Rights Agreement or the Use and Occupancy Agreement.

     "Return" means any Tax return, statement, report, form or election
(including, without limitation, estimated Tax returns and reports, extension
requests and forms, and information returns and reports) required to be filed
with any Taxing Authority, in each case as amended.

     "Return Due Date" means, with respect to any Return, the earlier of (i) the
due date (including extensions) of such Return, or (ii) the date such Return is
filed.

     "Spin-Off" means a distribution of stock of Sub that is intended to qualify
as a transaction described in Section 355 of the Code.

     "Spin-Off Tax" means any Tax incurred by the Parent Group or the Sub Group
(i) as a result of a Spin-Off failing to qualify as a transaction described in
Section 355 of the Code, or (ii) through the application of Section 355(d) or
(e) of the Code to a Spin-Off.

     "Sub" means c-quential, Inc., a Delaware corporation, or any successor
thereto.

     "Sub Group" means the group of corporations that would constitute a
separate Affiliated Group with Sub as the Common Parent if Sub were not a member
of the ADL Affiliated Group.

     "Sub Subsidiary" means Sub or any entity in which Sub holds a direct or
indirect interest.

     "Tax" means any tax imposed by the Code, and any net income, capital gains,
alternative or add-on minimum, gross income, gross receipts, sales, use, ad
valorem, value added, transfer, franchise, profits, license, withholding (as
payor or recipient), payroll, employment, excise, severance, stamp, capital
stock, occupation, property, real property gains, environmental, windfall,
premium, custom, duty or other tax, recording fee, governmental fee or other
like assessment or charge of any kind whatsoever imposed by any domestic or
foreign jurisdiction, together with any related interest, penalties, additions
to tax and related costs and expenses (including but not limited to legal and
accounting fees).

     "Tax Adjustment" means any adjustment (whether positive or negative)
required by a Taxing Authority, or appearing in an amended Return, to any Tax
liability or item reflected (or which should have been reflected) in any Return.

     "Tax Advisor" means an attorney, law firm, accountant, accounting firm or
other person designated by a party as its tax advisor.

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     "Tax Dispute" means any dispute, controversy or claim between any Parent
Subsidiary and any Sub Subsidiary arising out of or relating to this Agreement,
including without limitation the breach, interpretation or validity of any term
or condition hereof, or the withholding by Sub or Parent (whether reasonably or
unreasonably) of any approval required hereunder other than a consent described
in Section 6.1.

     "Taxing Authority" means any governmental authority or any subdivision,
agency, commission or authority thereof, or any quasi-governmental or private
body having jurisdiction over the assessment, determination, or imposition of
any Tax.

     "Tax Proceeding" means any Tax audit, dispute or proceeding (whether
administrative or judicial).

     "Total Sub Taxes" means the sum of (i) Taxes paid by Sub Subsidiaries, (ii)
Hypothetical Federal Taxes and (iii) Hypothetical Combined Taxes, less the sum
of (x) Tax refunds received by Sub Subsidiaries, (y) Hypothetical Federal
Refunds and (z) Hypothetical Combined Refunds.  Whenever Total Sub Taxes are
calculated, each of the amounts referred to in clauses (i), (ii), (iii), (x),
(y) and (z) of the preceding sentence shall be the total of all such amounts
(with Tax Adjustments taken into account) for all periods beginning on or after
the Effective Date (or, with respect to any period beginning before and ending
after the Effective Date, the portion of such period beginning on the day after
the Effective Date) and ending on or before the date of the calculation.  Total
Sub Taxes may be either positive or negative.

SECTION 2.  TAX RETURNS, PAYMENTS AND PROCEEDINGS.
            -------------------------------------

     Section 2.1  Consolidated Returns.
                  --------------------

          (a) Parent shall be responsible for the preparation and filing of all
Consolidated Returns; provided, however, that Sub shall have the right to
review, at least 10 days prior to the Return Due Date of any Consolidated
Return, a draft of the portion of such Return that reflects the operations and
tax items of the Sub Group.

          (b) Parent shall be responsible for the payment of all Federal Income
Taxes attributable to Consolidated Return Years, and shall be entitled to all
Federal Income Tax refunds attributable to Consolidated Return Years.

     Section 2.2  Combined Returns.
                  ----------------

          (a) Parent shall be responsible for the preparation and filing of all
Combined Returns; provided, however, that Sub shall have the right to review, at
least 10 days prior to the Return Due Date of any Combined Return, a draft of
the portion of such Return that reflects the operations and tax items of the Sub
Subsidiaries included in such Return.

          (b)  Parent shall be responsible for the payment of all Taxes
attributable to periods and items reflected (or which should have been
reflected) in any Combined Return, and shall be entitled to all Tax refunds
attributable to periods and items reflected (or which should have been
reflected) in any Combined Return.

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     Section 2.3  Tax Proceedings Respecting Consolidated and Combined Returns.
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Tax Proceedings respecting any Consolidated Return or Combined Return shall be
controlled by Parent.

     Section 2.4  Other Party's Tax Objectives Taken Into Account.  In the
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preparation of all Returns and in the conduct of all Tax Proceedings--

          (a) the Parent Subsidiaries shall take into account and promote the
Tax objectives of the Sub Subsidiaries, provided that, in so doing, the Parent
Subsidiaries are not adversely affected; and

          (b) the Sub Subsidiaries shall take into account and promote the Tax
objectives of the Parent Subsidiaries, provided that, in so doing, the Sub
Subsidiaries are not adversely affected.

SECTION 3.  REORGANIZATION TAXES; TAX BENEFITS
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     Section 3.1  Parent Responsible for Pre-Effective Date Taxes.
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          (a) Parent shall be responsible for the payment of all Taxes of all
Sub Subsidiaries incurred with respect to periods ending on or before the
Effective Date.

          (b) With respect to any period that begins before and ends after the
Effective Date, Parent shall be responsible for the payment of all Taxes of all
Sub Subsidiaries incurred with respect to the portion of such period ending on
the Effective Date.

     Section 3.2  Parent Responsible for Reorganization Taxes.  Parent shall be
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responsible for the payment of all Reorganization Taxes (including
Reorganization Taxes reported on Returns filed by Sub Subsidiaries).

     Section 3.3  Reimbursement for Reorganization Tax Benefits.
                  ---------------------------------------------

          (a) The amount of the Reorganization Tax Benefit shall be calculated
at such times as Parent may reasonably request, provided, however, that it be
calculated annually.

          (b) Promptly upon the approval by Sub and Parent of the calculation
referred to in Section 3.3(a) (which approval shall not be unreasonably
withheld)--

               (I) Sub shall pay to Parent the excess (if any) of the
Reorganization Tax Benefit over the total of all payments previously made by Sub
under this Section 3.3 (net of the total of all payments previously made by
Parent under this Section 3.3), and

               (II) Parent shall pay to Sub the excess (if any) of the total of
all payments previously made by Sub under this Section 3.3 (net of the total of
all payments previously made by Parent under this Section 3.3) over the
Reorganization Tax Benefit.

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          (c)  Notwithstanding any other provision of this Section 3.3, the
total of all payments made by Sub under this Section 3.3 (net of the total of
all payments made by Parent under this Section 3.3) shall not exceed the total
of all Reorganization Taxes.

     Section 3.4  Reimbursement for Federal Utilized Tax Benefits.
                  -----------------------------------------------

          (a) The amount of the Federal Utilized Tax Benefit for any
Consolidated Return Year shall be calculated at such time as Sub may reasonably
request, provided, however, that it be calculated annually.

          (b)  Promptly upon the approval by Sub and Parent of the calculation
referred to in Section 3.4(a) (which approval shall not be unreasonably
withheld), Parent shall pay to Sub the amount (if any) of the Federal Utilized
Tax Benefit.

          (c) When any Tax Adjustment becomes final, the Federal Utilized Tax
Benefit for each affected Consolidated Return Year shall be recalculated taking
such Tax Adjustment into account.  After approval by Parent and Sub of such a
recalculation for any affected Consolidated Return Year (which approval shall
not be unreasonably withheld), Sub shall pay to Parent or Parent shall pay to
Sub (as appropriate) an amount equal to the difference between the recalculated
Federal Utilized Tax Benefit for such affected Consolidated Return Year and any
amounts previously paid with respect to such Consolidated Return Year under this
Section 3.4, together with interest thereon at the rate interest would be paid
on a Federal Income Tax overpayment (in the case of a payment by Parent to Sub)
or on a Federal Income Tax underpayment (in the case of a payment by Sub to
Parent) paid at the time of such payment.

     Section 3.5  Reimbursement for Combined Utilized Tax Benefits.  Payments
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shall be made with respect to all Combined Utilized Tax Benefits, and the
calculation and recalculation of the amounts of such payments, and the approval
and timing of such payments, shall be similar to and consistent with the
procedures set out in Section 3.4.

     Section 3.6  Partial Years.  If Sub is a member of the ADL Affiliated Group
                  -------------
for less than an entire Consolidated Return Year, or if all of the Sub
Subsidiaries that are included in a Combined Return for any period are
includible for less than the entire period, the calculation of the
Reorganization Tax Benefit, Federal Utilized Tax Benefit and/or Combined
Utilized Tax Benefit (as appropriate) shall be similar to and consistent with
the procedures set out in Section 4.2.

SECTION 4.  INTERCOMPANY PAYMENTS RESPECTING FEDERAL INCOME TAXES.
            -----------------------------------------------------

     Section 4.1  Hypothetical Federal Taxes and Refunds.  For each Consolidated
                  --------------------------------------
Return Year--

          (a) Sub shall pay to Parent an amount equal to the amount of any
Federal Income Tax for which Sub would have been liable (including interest for
which Sub would have been liable, but excluding Tax penalties for which Sub
would have been liable) had Sub filed consolidated Federal Income Tax Returns
for the Sub Group, separate and apart from the Parent Group, for all periods
beginning on or after Effective Date (the "Hypothetical Federal Tax");

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          (b) Parent shall pay to Sub an amount equal to the amount of any
refund of Federal Income Tax that Sub would have received (including interest
that Sub would have received) had Sub filed consolidated Federal Income Tax
Returns for the Sub Group, separate and apart from the Parent Group, for all
periods beginning on or after the Effective Date (the "Hypothetical Federal
Refund");

          (c) the calculation of the Hypothetical Federal Tax or Hypothetical
Federal Refund shall be made by assuming that Sub made such Tax elections and
choices of methods as would most benefit the Sub Group;

          (d) the calculation of the Hypothetical Federal Tax or Hypothetical
Federal Refund shall be made by Parent and submitted to Sub for review and
approval at least 10 days prior to the Return Due Date of the Consolidated
Return for the Consolidated Return Year, and Sub's approval of such calculation
shall not be unreasonably withheld;

          (e)  except as provided in Section 4.3, all payments required by this
Section 4.1 shall be paid promptly upon the approval referred to in Section
4.1(d); provided, however, that (except as provided in Section 4.3) no such
payment shall be due prior to 3 days before the Return Due Date of the
Consolidated Return for the Consolidated Return Year; and

          (f) notwithstanding any other provision of this Section 4.1, when
calculating the Hypothetical Federal Tax or Hypothetical Federal Refund for any
Consolidated Return Year, any item which gave rise to a Federal Utilized Tax
Benefit in a prior Consolidated Return Year shall not be taken into account.

     Section 4.2  Sub Not a Member for Entire Consolidated Return Year.  If Sub
                  ----------------------------------------------------
is a member of the ADL Affiliated Group for less than the entire Consolidated
Return Year, the Hypothetical Federal Tax or Hypothetical Federal Refund shall
be calculated by hypothetically closing the books of the Sub Group as of the day
before the first day and as of the last day that Sub is a member of the ADL
Affiliated Group and taking into account only those items that accrue in that
portion of the Consolidated Return Year during which Sub is a member of the ADL
Affiliated Group, unless Sub and Parent agree otherwise.

     Section 4.3  Estimated Payments.  For each Estimated Payment Date in any
                  ------------------
Consolidated Return Year--

          (a) Parent shall calculate for the Sub Group an estimated Hypothetical
Federal Tax in a manner that is similar to and consistent with the Hypothetical
Federal Tax calculations set out in Sections 4.1 and 4.2;

          (b) Sub shall assist and cooperate with Parent in good faith and to
the extent necessary for Parent to make the calculation referred to in Section
4.3(a) reasonably accurately;

          (c) the calculation referred to in Section 4.3(a) shall be submitted
to Sub for review and approval at least 10 days prior to the related Estimated
Payment Date, and Sub's approval of such calculation shall not be unreasonably
withheld; and

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          (d) promptly upon the approval referred to in Section 4.3(c), Sub
shall pay to Parent the approved amount; provided, however, that no such payment
shall be due prior to 3 days before the related Estimated Payment Date.

     Section 4.4  Adjustments for Estimated Payments.  Amounts paid under
                  ----------------------------------
Section 4.3 shall be taken into account when calculating the payments due under
Sections 4.1 and 4.2.

     Section 4.5  Tax Adjustments.  When any Tax Adjustment made with respect to
                  ---------------
any Consolidated Return becomes final--

          (a) Parent shall promptly recalculate the Hypothetical Federal Tax or
Hypothetical Federal Refund for all affected Consolidated Return Years taking
such Tax Adjustment into account;

          (b) the recalculation referred to in Section 4.5(a) shall be promptly
submitted to Sub for review and approval, and Sub's approval of such
recalculation shall not be unreasonably withheld; and

          (c) promptly upon the approval referred to in Section 4.5(b), Sub
shall pay to Parent or Parent shall pay to Sub (as appropriate), an amount equal
to the difference between the recalculated Hypothetical Federal Tax or
recalculated Hypothetical Federal Refund and the Hypothetical Federal Tax or
Hypothetical Federal Refund, together with interest thereon at the rate interest
would be paid on a Federal Income Tax overpayment (in the case of a payment by
Parent to Sub) or on a Federal Income Tax underpayment (in the case of a payment
by Sub to Parent) paid at the time of such payment.

     Section 4.6  Estimated Federal Income Tax Underpayment Penalties. No
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intercompany payments shall be made with respect to Consolidated Tax penalties
except for penalties arising from the underpayment of estimated Consolidated
Taxes.  For each Consolidated Return Year--

          (a) Parent shall calculate for the Sub Group the amount (if any) of
the penalty for underpayment of Federal Income Taxes for which Sub would have
been liable had Sub filed consolidated Federal Income Tax Returns for the Sub
Group, separate and apart from the Parent Group, for all periods beginning on or
after the Effective Date.  Such calculation shall be made in a manner that is
consistent with the Hypothetical Federal Tax calculations set out in Sections
4.1 and 4.2;

          (b) the calculation referred to in Section 4.6(a) shall be submitted
to Sub for review and approval, and Sub's approval of such calculation shall not
be unreasonably withheld; and

          (c) promptly upon the approval referred to in Section 4.6(b), Sub
shall pay to Parent the approved amount (if any).

SECTION 5.  INTERCOMPANY PAYMENTS RESPECTING COMBINED TAXES.
            -----------------------------------------------

     Section 5.1  Payments and Calculations.  Payments between Parent and Sub
                  -------------------------
shall be made with respect to all Combined Taxes, and the calculation and
recalculation of the amounts of such payments, and the review, approval and
timing of such payments, shall be similar to and consistent with the procedures
set out in Section 4.

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     Section 5.2  Estimated Combined Tax Underpayment Penalties.  No
                  ---------------------------------------------
intercompany payments shall be made with respect to Combined Tax penalties
except for penalties arising from the underpayment of estimated Combined Taxes.
The calculation and payment of any hypothetical estimated Combined Tax
underpayment penalty shall be similar to and consistent with the procedures set
out in Section 4.6.

     Section 5.3  Definitions.  For purposes of this Agreement, the term
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"Hypothetical Combined Tax" means an amount calculated under this Section 5 that
is payable by Sub, and the term "Hypothetical Combined Refund" means an amount
calculated under this Section 5 that is payable by Parent.

SECTION 6.  MEMBERSHIP IN AFFILIATED GROUP; CONTROL.
            ---------------------------------------

     Section 6.1  Sub Covenants.  Sub hereby covenants and agrees that it shall
                  -------------
not without Parent's consent (which may be withheld for any reason) take any
action that could result in, or fail to take any action where such failure could
result in--

          (a) Sub no longer being a member of the ADL Affiliated Group;

          (b) the Parent Group no longer being in "control" of Sub within the
meaning of Section 368(c) of the Code; or

          (c) the Parent Group including in income any "excess loss account" in
the stock of Sub under Treasury Regulations Section 1.1502-19.

     Section 6.2  Sub Indemnification.  Sub shall be responsible for, and shall
                  -------------------
indemnify and hold the Parent Group harmless from, any increase in Taxes caused
by any breach of the covenants set out in Section 6.1, including but not limited
to (i) Taxes incurred by reason of including in income any excess loss account
under Treasury Regulations Section 1.1502-19 that would not have been included
in income in the absence of such breach, (ii) Taxes incurred by reason of
including in income any deferred intercompany gain under Treasury Regulations
Section 1.1502-13 that would not have been included in income in the absence of
such breach, and (iii) Taxes incurred upon a distribution of Sub stock that
would not have been incurred in the absence of such breach.

SECTION 7.  COOPERATION.
            -----------

     Section 7.1  Cooperation Generally.  Parent and Sub agree to cooperate
                  ---------------------
fully with each other in connection with all matters subject to this Agreement.
Such cooperation includes but is not limited to--

          (a) making personnel and records available within 10 days (or such
other period as may be reasonable under the circumstances) after a request for
such personnel or records is made by the other party;

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          (b) retaining all records which may contain information or provide
evidence relevant to any open taxable period;

          (c) executing, acknowledging and delivering any instrument or document
that may be necessary or helpful in connection with (i) any Return that the
other party has the authority to prepare and file, (ii) any Tax Proceeding that
the other party has the authority to control, or (iii) the carrying out of any
obligation of the other party under this Agreement;

          (d) using best efforts to obtain any documentation from any Taxing
Authority, governmental authority or other third party that may be necessary or
helpful in connection with the foregoing; and

          (e) keeping the other party fully informed with respect to any
material developments relating to any matter subject to this Agreement.

     Section 7.2  Indemnities.  Parent agrees to indemnify and hold harmless
                  -----------
each Sub Subsidiary (and their officers and employees), and Sub agrees to
indemnify and hold harmless each Parent Subsidiary (and their officers and
employees) from any Tax attributable to the negligence or misconduct of a Parent
Subsidiary or Sub Subsidiary, as the case may be, in supplying inaccurate or
incomplete information under Section 7.1.

SECTION 8.  SPIN-OFF PROVISIONS.
            -------------------

     Section 8.1  Prior to the Parent Group engaging in a Spin-Off of Sub,
Parent and Sub shall enter into an agreement that shall include customary
provisions, covenants and indemnities, including but not limited to--

          (a) Sub's indemnity of the Parent Group for any Spin-Off tax
attributable to any act or omission of the Sub Group;

          (b) Parent's indemnity of the Sub Group for any Spin-Off tax
attributable to any act or omission of the Parent Group;

          (c) Sub's covenant not to participate in any merger, reorganization,
acquisition, equity restructuring or other transaction that results in one or
more persons acquiring in Sub a 50% or greater interest, within the meaning of
Section 355(e) of the Code, within the 4 year period beginning 2 years prior to
the Spin-Off;

          (d) Parent's covenant not to participate in any merger,
reorganization, acquisition, equity restructuring or other transaction that
results in one or more persons acquiring in Parent a 50% or greater interest,
within the meaning of Section 355(e) of the Code, within the 4 year period
beginning 2 years prior to the Spin-Off;

          (e) customary provisions regarding cooperation, exchange of
information, and control of audits and litigation respecting Taxes; and

          (f) customary provisions regarding consistency in tax return
positions.

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SECTION 9.  MISCELLANEOUS.
            -------------

     Section 9.1  Survival.  No provision of the Reorganization Agreement shall
                  --------
operate so as to terminate the operation of any provision of this Agreement.
This Agreement shall survive a Spin-Off or other separation transaction except
to the extent amended by an agreement described in Section 8.1 or an amendment
described in Section 9.4.

     Section 9.2  Confidentiality.  The provisions of the Reorganization
                  ---------------
Agreement relating to confidentiality shall apply with respect to any
information obtained or learned by either party from the other party in
connection with the parties' performance of their respective obligations
hereunder.

     Section 9.3  Tax Dispute Resolution.  All Tax Disputes shall be resolved by
                  ----------------------
mutual agreement of the Tax Advisors of the disputing parties, but if with
respect to any Tax Dispute the Tax Advisors of the disputing parties cannot
reach an agreement, then the disputing parties shall appoint a mutually
agreeable Tax Advisor to resolve the Tax Dispute, and if the disputing parties
cannot agree on a Tax Advisor to so appoint, then the Tax Dispute shall be
resolved in accordance with the provisions of Section 11.3 of the Reorganization
Agreement relating to dispute resolution.

     Section 9.4  Amendment and Waiver.  The provisions of this Agreement,
                  --------------------
including, without limitation, this Section, may not be waived and this
Agreement shall not be amended or modified except in accordance with this
Section.  The provisions of this Agreement may be waived only by the written
consent of a majority of the Independent Directors of the party which is the
beneficiary of the particular provision being waived.  No failure or delay by
any party in exercising any right or remedy hereunder shall operate as a waiver
thereof, and a waiver of a particular right or remedy on one occasion shall not
be deemed a waiver of any other right or remedy or a waiver on any subsequent
occasion.  The provisions of this Agreement may be amended, modified or
supplemented only by the written consent of a majority of the Independent
Directors of each of the parties.

     Section 9.5  Notices.  Any notice to any party hereto given pursuant to
                  -------
this Agreement shall be in writing and shall be given by the means, and to the
addresses, set forth in the "Notices" section of the Reorganization Agreement.

     Section 9.6  Successors and Assigns.  This Agreement may not be assigned by
                  ----------------------
either party without the prior written consent of the other party, and any
attempt to assign any rights or obligations hereunder without such consent shall
be void.  This Agreement shall inure to the benefit of, and be binding upon and
enforceable against the respective successors and permitted assigns of the
parties hereto.

     Section 9.7  Entire Agreement; Parties in Interest.  This Agreement, the
                  -------------------------------------
schedules hereto (if any) and any applicable provisions of the Reorganization
Agreement and the Ancillary Agreements comprise the entire agreement between the
parties hereto as to the subject matter hereof and supersede all prior
agreements and understandings between them relating to the subject matter
hereof, and, except as explicitly provided, are not intended to confer upon any
person other than the parties hereto (including their successors and permitted
assigns) any rights or remedies.

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     Section 9.8  Overlap with Other Agreements.  If both (i) the provisions of
                  -----------------------------
this Agreement and (ii) the provisions of the Reorganization Agreement or any
Ancillary Agreement are by their terms applicable, then both the provisions of
this Agreement and such other agreement shall apply, but if the provisions of
this Agreement and such other agreement are in conflict, then (with respect to
matters subject to this Agreement) the provisions of this Agreement shall
control.

     Section 9.9  Severability.  If any term or provision of this Agreement or
                  ------------
the application thereof to any person or circumstance shall to any extent be
invalid or unenforceable, the remainder of this Agreement or the application of
such terms or provisions to persons or circumstances other than those as to
which it is invalid or unenforceable shall not be affected thereby and each term
and provision of this Agreement shall be valid and enforced to the fullest
extent permitted by law.

     Section 9.10  Captions. Captions and headings are supplied herein for
                   --------
convenience only and shall not be deemed a part of this Agreement for any
purpose.

     Section 9.11  Governing Law.  This Agreement shall be governed by and
                   -------------
construed in accordance with the internal substantive laws of the Commonwealth
of Massachusetts, without giving effect to the principles of conflicts of laws
thereof.

     Section 9.12  Counterparts.  This Agreement may be executed in several
                   ------------
counterparts, and all counterparts so executed shall constitute one agreement,
binding upon the parties hereto, notwithstanding that the parties are not
signatory to the same counterpart.

     IN WITNESS WHEREOF, Parent and Sub have caused this Agreement to be duly
executed by their authorized representatives as an agreement under seal as of
the date first written above.

                                    PARENT:

                                    Arthur D. Little, Inc., a Massachusetts
                                    corporation

                                    By:_________________________________
                                       Name:
                                       Title:

                                    SUB:

                                    c-quential, Inc., a Delaware corporation

                                    By:_________________________________
                                       Name:
                                       Title:

                                       12<PAGE>

                                                                    EXHIBIT 10.7

                     FORM OF REGISTRATION RIGHTS AGREEMENT
                     -------------------------------------

     This Registration Rights Agreement (this "Agreement") is entered into as
____________, 2000 by and between c-quential, Inc., a Delaware corporation (the
"Company"), and Arthur D. Little, Inc., a Massachusetts corporation ("ADL").

     WHEREAS, ADL, indirectly through its affiliates, owns shares of the class A
common stock, par value $.01 per share, of the Company and the class B common
stock, par value $.01 per share, of the Company; and

     WHEREAS, the execution and delivery of this Agreement is a condition to the
transactions contemplated by the Reorganization Agreement dated as of _____,
2000 by and among the Company, ADL and the other parties named therein.

     NOW, THEREFORE, in consideration of the mutual promises and agreements set
forth herein, and other valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto hereby agree as follows:

     Section 1.  Definitions.
                 -----------

     As used in this Agreement, the following terms have the following meanings:

     "Business Day" means a day other than Saturday, Sunday or any day on which
banks located in the State of New York are authorized or obligated to close.

     "Class A Stock" means the class A common stock, par value $.01 per share,
      -------------
of the Company and any securities into which the Class A Stock shall have been
changed or any securities resulting from any reclassification or
recapitalization of the Class A Stock.

     "Class B Stock" means the class B common stock, par value $.01 per share,
      -------------
of the Company and any securities into which the Class B Stock shall have been
changed or any securities resulting from any reclassification or
recapitalization of the Class B Stock.

     "Commission" means the United States Securities and Exchange Commission.
      ----------

     "Common Stock" means, collectively, the Class A Stock and the Class B
      ------------
Stock.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended from
      ------------
time to time, or any successor statute, and the rules and regulations of the
Commission promulgated thereunder.

     "Holder" means each holder of record of Registrable Securities.
      ------

     "Independent Director" with respect to Sub, shall mean a member of the Sub
Board of Directors who is not an employee or officer of Sub or an officer,
employee or director of Parent or a member of the Parent Group, and with respect
to Parent, shall mean a member of the Parent Board of Directors who is not an
employee or officer of Parent or a member of the Parent Group.
<PAGE>

     "Parent Group" shall have the meaning given to such term in the
      -----------
Reorganization Agreement.

     "Person" means any individual, corporation, partnership, limited liability
      ------
company, joint venture, association, joint-stock company, trust, unincorporated
organization or government or other agency or political subdivision thereof.

     "Prospectus" means the prospectus included in any Registration Statement
      ----------
(including, without limitation, a prospectus that discloses information
previously omitted from a prospectus filed as part of an effective Registration
Statement in reliance upon Rule 430A promulgated under the Securities Act), as
amended or supplemented by any prospectus supplement, and by all other
amendments and supplements to the prospectus.

     "Registrable Securities" means the Shares and any shares of Common Stock
      ----------------------
issued or issuable with respect to the Shares by reason of a stock dividend or
stock split, recapitalization or similar transaction, or a conversion of shares
from Class B Stock to Class A Stock, until such time as (i) a Registration
Statement covering such Registrable Securities has been declared effective and
                                                                           ---
such Registrable Securities have been disposed of pursuant to such effective
Registration Statement and the transferee receives certificates from such
securities not bearing a restrictive Securities Act legend, and (ii) such
Registrable Securities are transferred to any Person other than a Holder
pursuant to Rule 144 (or any similar provision then in force, but not Rule 144A)
under the Securities Act, including a sale pursuant to the provisions of Rule
144(k) and the transferee receives certificates from such securities not bearing
a restrictive Securities Act legend.

     "Registration Statement" means any registration statement of the Company
      ----------------------
that covers any of the Registrable Securities pursuant to the provisions of this
Agreement, and all amendments and supplements to any such registration
statement, including post-effective amendments, in each case including the
Prospectus, all exhibits, and all material incorporated by reference or deemed
to be incorporated by reference in such registration statement.

     "Securities Act" means the Securities Act of 1933, as amended from time to
      --------------
time, or any successor statute, and the rules and regulations of the Commission
promulgated thereunder.

     "Shares" means the ________ shares of Class A stock and Class B Stock
      ------
held by ADL and the other members of the Parent Group.

     Section 2.  Demand Registration.
                 -------------------

     (a)  At any time after the date which is six months after the closing of
the initial underwritten public offering of the Common Stock registered under
the Securities Act, Holders holding at least 50% of the Registrable Securities
then outstanding propose to dispose of all or part of such Registrable
Securities, then such Holders may request the Company in writing to effect such
registration under the Securities Act, stating the number of shares of
Registrable Securities to be disposed of and the intended method(s) of
disposition of such shares. Holders of Registrable Securities which request
registration pursuant to this Section 2(a) are referred to herein as the
"Initiating Holders". In connection with any registration under this Section 2
involving an underwriting (an "Underwritten Offering"), the Initiating Holders
will have the right to select an investment banker(s) and manager(s) for such
Underwritten Offering, which investment banker(s) and manager(s) shall be
reasonably satisfactory to the Company. Upon
<PAGE>

receipt of a request from the Initiating Holders, the Company shall give prompt
written notice thereof to all other Holders and shall use commercially
reasonable efforts to promptly effect the registration under the Securities Act
of all Registrable Securities specified in the requests of the Initiating
Holders and the written requests (stating the number of shares of Registrable
Securities to be disposed of and the intended method of disposition of such
shares) of all other Holders given within 20 days after receipt of such notice
from the Company, all to the extent requisite to permit the disposition (in
accordance with the intended methods of disposition) of the Registrable
Securities to be registered.

     (b)  Notwithstanding the foregoing, the Company may postpone taking action
with respect to a registration requested pursuant to Section 2(a) (a "Demand
Registration") for a reasonable period of time after receipt of the request (not
exceeding 60 days) if, in the good faith opinion of the Company's Board of
Directors, effecting the registration would adversely affect a material
financing, acquisition, disposition of assets or stock, merger or other
comparable transaction or would require the Company to make public disclosure of
information the public disclosure of which could have a material adverse effect
upon the Company; provided that Company shall not delay such action pursuant to
                  --------
this sentence more than twice in any twelve (12) month period.

     (c)  If the managing underwriter(s) of an Underwritten Offering under this
Section 2 advises the Company that the number of securities to be sold in such
Underwritten Offering, is greater than the number which can be offered without
adversely impacting such Underwritten Offering, including, without limitation,
the price range or probability of success of such Underwritten Offering, then
the Company will include in such Underwritten Offering the number of securities
which the managing underwriter(s) advises the Company may be included in such
Underwritten Offering without such adverse impact in the following priority: (i)
first, Registrable Securities requested to be included in such registration by
the Holders (including the Initiating Holders) and (ii) second, other securities
of the Company proposed to be included in such registration, allocated among the
holders thereof in accordance with the priorities then existing among the
Company and the holders of such other securities.

     Section 3.  Piggyback Registration.
                 ----------------------

          (a)  If at any time or times after the date hereof while any
Registrable Securities are outstanding the Company proposes to register under
the Securities Act any shares of Common Stock (other than (i) a registration on
Form S-8 or any successor form or in connection with any employee or director
welfare, benefit or compensation plan, (ii) a registration on Form S-4 or any
successor form or in connection with an exchange offer, (iii) a registration in
connection with a securities or rights offering exclusively to the Company's
securityholders, (iv) a registration in connection with an offering solely to
employees of the Company or its affiliates, (v) a registration relating to a
transaction pursuant to Rule 145 or any other similar rule of the Commission
under the Securities Act or (vi) a shelf registration), then the Company will
give written notice of such proposed registration to the Holders at least twenty
(20) days before the filing of any Registration Statement with respect thereto.
If within ten (10) days after such notice is given, the Company receives a
written request from any Holder for the inclusion in such Registration Statement
of some or all of the Registrable Securities held by such Holder (which request
will specify the number of Registrable Securities intended to be disposed
<PAGE>

of by such Holder and the intended method of distribution thereof), the Company
will (subject to the provisions of paragraphs (b) and (c) of this Section 3)
include such Registrable Securities in such Registration Statement. The Company
may withdraw a Registration Statement filed under this Section 3 at any time
prior to the time it becomes effective, provided that the Company will give
prompt notice of such withdrawal to the Holders which requested to be included
in such Registration Statement.

     (b)  In connection with any Underwritten Offering under this Section 3, the
Company will not be required to include a Holder's Registrable Securities in
such Underwritten Offering unless such Holder accepts the terms of the
underwriting as agreed upon between the Company and the underwriters selected by
the Company.  If the managing underwriter(s) of an Underwritten Offering under
this Section 3 advises the Company that the number of securities to be sold in
such Underwritten Offering, including by Persons other than the Company
(including the Holders) (collectively, the "Selling Stockholders"), is greater
than the number which can be offered without adversely impacting such
Underwritten Offering, including, without limitation, the price range or
probability of success of such Underwritten Offering, then the Company will
include in such Underwritten Offering the number of securities which the
managing underwriter(s) advises the Company may be included in such Underwritten
Offering without such adverse impact in the following priority:

               (i)  if such registration as initially proposed by the Company
     was solely a primary registration of its securities, (A) first, all
     securities the Company proposes to sell, (B) second, Registrable Securities
     proposed to be sold by the Holders and (C) third, securities proposed to be
     sold by all Selling Stockholders other than the Holders, allocated among
     such Selling Stockholders in accordance with the priorities then existing
     among the Company and such Selling Stockholders.

               (ii) if such registration as initially proposed by the Company
     was in whole or in part requested by holders of securities of the Company
     (other than Holders) pursuant to demand registration rights, (A) first,
     such securities held by the holders initiating such registration and, if
     applicable, any securities proposed by the Company to be sold for its own
     account, allocated in accordance with the priorities then existing among
     the Company and such holders, (B) second, any Registrable Securities
     requested to be included in such registration by the Holders, and (C)
     third, any other securities of the Company proposed to be included in such
     registration, allocated among the holders thereof in accordance with the
     priorities then existing among the Company and such holders.

     (d)  Each Holder hereby agrees that such Holder may not participate in any
Underwritten Offering unless such Holder (a) agrees to sell such Holder's
Registrable Securities on the basis provided in the underwriting arrangements
applicable to such Underwritten Offering and (b) completes and executes all
questionnaires, powers of attorney, indemnities, underwriting agreements and
other documents reasonably required under the terms of the underwriting
arrangements for such Underwritten Offering.
<PAGE>

     Section 4.  Registration Procedures.
                 -----------------------

          (a)  The Company shall prepare promptly, and file with the Commission
as required by Section 2(a), a Registration Statement with respect to the number
of Registrable Securities specified as provided in Section 2(a), and thereafter
shall use commercially reasonable efforts to cause such Registration Statement
relating to Registrable Securities to become effective as soon as possible after
such filing, and keep the Registration Statement effective at all times until
the earlier of (i) which is 180 days after the effective date of the
Registration Statement, or (ii) the date on which all Holders with Registrable
Securities included in the Registration Statement have sold such Registrable
Securities.  Each Holder shall give notice to the Company when it has sold all
of its Registrable Securities covered by a Registration Statement.

          (b)  The Company will notify each Holder whose Registrable Securities
are included in a Registration Statement of the effectiveness of such
Registration Statement and will furnish to each such Holder and the
underwriters, if any, without charge, such number of conformed copies of such
Registration Statement and any post-effective amendment thereto and such number
of copies of the Prospectus (including each preliminary Prospectus) and any
amendments or supplements thereto, as such Holder may reasonably request in
order to facilitate the sale of such Holder's Registrable Securities.

          (c)  The Company shall promptly prepare and file with the Commission
such amendments and post-effective amendments to each Registration Statement as
may be necessary to keep such Registration Statement effective for as long as
such registration is required to remain effective pursuant to the terms hereof;
shall cause the Prospectus to be supplemented by any required Prospectus
supplement, and, as so supplemented, to be filed pursuant to Rule 424 under the
Securities Act; and shall comply with the provisions of the Securities Act
applicable to it with respect to the disposition of all Registrable Securities
covered by such Registration Statement during the applicable period in
accordance with the intended methods of disposition by the Holders set forth in
such Registration Statement or supplement to the Prospectus;

          (d)  The Company will use commercially reasonable efforts to register
or qualify the Registrable Securities covered by any Registration Statement
under such other securities or "blue sky" laws of such states of the United
States as any Holder or underwriter reasonably requests; provided, however, that
                                                         --------  -------
the Company will not be required (i) to qualify as a foreign corporation to do
business in any jurisdiction in which it is not then qualified, (ii) to file any
general consent to service of process, or (iii) to subject itself to taxation in
any jurisdiction where it would not otherwise be subject to taxation.

          (e)  The Company shall promptly notify each Holder and any underwriter
in writing, (i) when a Prospectus or any Prospectus supplement or post-effective
amendment has been filed and, with respect to a Registration Statement or any
post-effective amendment, when the same has become effective, (ii) of any
request by the Commission or any state securities authority for amendments and
supplements to a Registration Statement and Prospectus or for additional
information after the Registration Statement has become effective, (iii) of the
issuance by the Commission of any stop order suspending the effectiveness of a
Registration Statement or the initiation or threatening of any proceedings for
that purpose, (iv) of the issuance by any state
<PAGE>

securities commission or other regulatory authority of any order suspending the
qualification or exemption from qualification of any of the Registrable
Securities under state securities or "blue sky" laws or the initiation of any
proceedings for that purpose, (v) if, between the effective date of a
Registration Statement and the closing of any sale of Registrable Securities
covered thereby, the representations and warranties of the Company contained in
any underwriting agreement, securities sales agreement or other similar
agreement, if any, relating to the offering cease to be true and correct in all
material respects, and (vi) of the happening of any event which makes any
statement made in a Registration Statement or related Prospectus untrue or which
requires the making of any changes in such Registration Statement or Prospectus
so that they will not contain any untrue statement of a material fact or omit to
state any material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading. Immediately following expiration of any Suspension Period (as
defined in Section 5), the Company shall prepare and file with the Commission
and furnish a supplement or amendment to such Prospectus so that, as thereafter
deliverable to the purchasers of such Registrable Securities, such Prospectus
will not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements therein, in light of the
circumstances under which they were made, not misleading.

          (f)  The Company shall make generally available to the Holders an
earnings statement satisfying the provisions of Section 11(a) of the Securities
Act no later than 45 days (90 days in the event it relates to a fiscal year)
after the end of the 12-month period beginning with the first day of the
Company's first fiscal quarter commencing after the effective date of a
Registration Statement, which earnings statement shall cover said 12-month
period, and which requirement will be deemed to be satisfied if the Company
timely files complete and accurate information on forms 10-Q, 10-K and 8-K under
the Exchange Act and otherwise complies with Rule 158 under the Securities Act.

          (g)  The Company shall promptly use commercially reasonable efforts to
prevent the issuance of any order suspending the effectiveness of a Registration
Statement, and if one is issued use commercially reasonably to obtain the
withdrawal of any order suspending the effectiveness of a Registration Statement
at the earliest possible moment.

          (h)  The Company shall, if requested by the managing underwriter or
underwriters, if any, Holders' counsel, or any Holder promptly incorporate in a
Prospectus supplement or post-effective amendment such information as such
managing underwriter or underwriters reasonably requests, or Holders' counsel
reasonably requests, to be included therein, including, without limitation, with
respect to the Registrable Securities being sold by such Holder to such
underwriter or underwriters, the purchase price being paid therefor by such
underwriter or underwriters and with respect to any other terms of an
underwritten offering of the Registrable Securities to be sold in such offering,
and promptly make all required filings of such Prospectus supplement or post-
effective amendment.

          (i)  In the case of any underwritten public offering, the Company
shall furnish to each Holder and to each underwriter a signed counterpart,
addressed to such Holder or underwriter, of (i) an opinion or opinions of
counsel to the Company, and (ii) a comfort letter or comfort letters from the
Company's independent public accountants, each in customary form and
<PAGE>

covering such matters of the type customarily covered by opinions or comfort
letters, as the case may be, as the managing underwriter therefor reasonably
requests.

          (j)  The Company shall cause the shares of Common Stock included in a
Registration Statement to be listed on each securities exchange (or quoted on
each interdealer quotation system), if any, on which similar securities issued
by the Company are then listed.

     Section 5.  Suspension Period.
                 -----------------

     Each Holder, upon receipt of any notice (a "Suspension Notice") from the
Company of the happening of any event of the kind described in Section 4(e)(vi),
shall forthwith discontinue disposition of the Registrable Securities pursuant
to the Registration Statement covering such Registrable Securities until such
Holder's receipt of the copies of the supplemented or amended Prospectus
contemplated by Section 4(f) or until it is advised in writing (the "Advice") by
the Company that the use of the Prospectus may be resumed, and has received
copies of any additional or supplemental filings which are incorporated by
reference in the Prospectus, and, if so directed by the Company, such Holder
will, or will request the managing underwriter or underwriters, if any, to,
deliver to the Company (at the Company's expense) all copies, other than
permanent file copies then in such Holder's possession, of the Prospectus
covering such Registrable Securities current at the time of receipt of such
notice; provided, however, that (x) the Company shall not give a Suspension
        --------  -------
Notice until after a Registration Statement has been declared effective, (y) the
Company shall not give more than two Suspension Notices during any period of
twelve consecutive months and (z) in no event shall the period from the date on
which any Holder receives a Suspension Notice to the date on which any Holder
receives either the Advice or copies of the supplemented or amended Prospectus
contemplated by Section 4(e) (the "Suspension Period") exceed 60 days.  In the
event that the Company shall give any Suspension Notice, the Company shall use
commercially reasonable efforts and take such actions as are reasonably
necessary to render the Advice and end the Suspension Period as promptly as
practicable.

     Section 6.  Registration Expenses.   Any and all expenses incident to the
                 ---------------------
Company's performance of or compliance with this Agreement, including without
limitation all Commission and securities exchange, NASDAQ or NASD registration
and filing fees, all fees and expenses incurred in connection with compliance
with state securities or "blue sky" laws (including reasonable fees and
disbursements of counsel for any underwriters in connection with "blue sky"
qualifications of the Registrable Securities), printing expenses, messenger and
delivery expenses, internal expenses (including, without limitation, all
salaries and expenses of the Company's officers and employees performing legal
or accounting duties), all expenses for word processing, printing and
distributing any Registration Statement, any Prospectus, any amendments or
supplements thereto, any underwriting agreements, securities sales agreements
and other documents relating to the performance of and compliance with this
Agreement, the fees and expenses incurred in connection with the listing of the
Registrable Securities, the fees and disbursements of counsel for the Company
and of the independent certified public accountants of the Company (including
the expenses of any special audit or comfort letters Securities Act liability
insurance (if the Company elects to obtain such insurance), the fees and
expenses of any special experts or other Persons retained by the Company in
connection with any registration, the reasonable fees and disbursements of no
more than one firm of legal counsel for the Holders and
<PAGE>

any reasonable out-of-pocket expenses of the Holders and their agents (other
than their counsel) including any reasonable travel costs (all such expenses
being herein called "Registration Expenses"), will be borne by the Company
whether or not the Registration Statement to which such expenses relate becomes
effective provided, however, that Registration Expenses shall not include
          --------  -------
underwriting fees, discounts or commissions attributable to the sale or
disposition of Registrable Securities.

     Section 7.  Indemnification and Contribution.
                 --------------------------------

     (a)  Indemnification by the Company.  The Company agrees to indemnify and
          ------------------------------
hold harmless, to the full extent permitted by law, each Holder, its officers,
directors, employees and agents and each Person, if any, which controls such
Holder within the meaning of either Section 15 of the Securities Act or Section
20 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
(collectively, "Controlling Persons"), from and against all losses, claims,
damages, liabilities and expenses (including without limitation any legal or
other fees and expenses reasonably incurred by any Holder or any such
Controlling Person in connection with defending or investigating any action or
claim in respect thereof) (collectively, "Damages") to which any of them may
become subject under the Securities Act or otherwise, insofar as such Damages
arise out of or are based upon (i) any untrue or alleged untrue statement of
material fact contained in any Registration Statement (including any related
preliminary or final Prospectus) pursuant to which Registrable Securities of
such Holder were registered under the Securities Act, (ii) any omission or
alleged omission to state therein a material fact necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading, or (iii) any violation or alleged violation by the Company of
the Securities Act, the Exchange Act, any other law, including, without
limitation, any state securities law, or any rule or regulation thereunder
relating to the offer or sale of the Registrable Securities pursuant to a
Registration Statement (the matters in the foregoing clauses (i) through (iii)
being, collectively, "Violations"), except insofar as and to the extent that
such Violation arose out of or was based upon information regarding such Holder
or its plan of distribution which was furnished to the Company by such Holder
for use therein, provided, further that the Company will not be liable to any
person who participates as an underwriter in the offering or sale of Registrable
Securities or any Controlling Person of such underwriter, in any such case to
the extent that any such Damages arise out of or are based upon (A) an untrue
statement or alleged untrue statement or omission or alleged omission made in
such Registration Statement (including any related preliminary or final
Prospectus) in reliance upon and in conformity with information furnished to the
Company for use in connection with the Registration Statement or the Prospectus
contained therein by such underwriter or Controlling Person or (B) the failure
of such underwriter or Controlling Person to send or give a copy of the final
Prospectus furnished to it by the Company at or prior to the time such action is
required by the Securities Act to the person claiming an untrue statement or
alleged untrue statement or omission or alleged omission if such statement or
omission was corrected in such final prospectus.  The obligations of the Company
under this Section 7(a) shall survive the completion of any offering of
Registrable Securities pursuant to a Registration Statement under this Agreement
or otherwise and shall survive the termination of this Agreement.

     (b)  Indemnification by the Holders.  Each Holder agrees to indemnify and
          ------------------------------
hold harmless, to the full extent permitted by law, the Company, its directors,
officers, employees and
<PAGE>

agents and each Controlling Person of the Company, from and against any and all
Damages to which any of them may become subject under the Securities Act or
otherwise to the extent such Damages arise out of or are based upon any
Violation, in each case to the extent that such Violation occurs as a result of
(i) any untrue statement or alleged untrue statement of material fact contained
in any Registration Statement (including any related preliminary or final
Prospectus), or any omission or alleged omission to state therein a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading, if and
to the extent that such statement or omission arose out of or was based upon
information regarding such Holder or its plan of distribution which was
furnished to the Company by such Holder for use therein, or (ii) the failure by
such Holder to deliver or cause to be delivered to any purchaser of the shares
covered by the Registration Statement the Prospectus contained in the
Registration Statement (as amended or supplemented, if applicable) furnished by
the Company to such Holder. Notwithstanding the foregoing, (A) in no event will
a Holder have any obligation under this Section 7(b) for amounts the Company
pays in settlement of any such loss, claim, damage, liability or action if such
settlement is effected without the consent of the Holder (which consent shall
not be unreasonably withheld) and (B) the total amount for which a Holder shall
be liable under this Section 7(b) shall not in any event exceed the aggregate
net proceeds received by such Holder from the sale of the Holder's Registrable
Securities in such registration. The obligations of the Holders under this
Section 7(b) shall survive the completion of any offering of Registrable
Securities pursuant to a Registration Statement under this Agreement or
otherwise and shall survive the termination of this Agreement.

     (c)  Contribution.  To the extent that the indemnification provided for in
          ------------
paragraph (a) or (b) of this Section 7 is held by a court of competent
jurisdiction to be unavailable to an indemnified party in respect of any
Damages, then each indemnifying party under such paragraph, in lieu of
indemnifying such indemnified party thereunder, will contribute to the amount
paid or payable by such indemnified party as a result of such Damages (i) in
such proportion as is appropriate to reflect the relative benefits received by
the Company on the one hand, and each Holder on the other, from the offering of
the Registrable Securities or (ii) if the allocation provided by clause (i)
above is not permitted by applicable law, in such proportion as is appropriate
to reflect not only the relative benefits referred to in clause (i) above but
also the relative fault of the Company, on the one hand, and the Holders, on the
other, in connection with the statements or omissions which resulted in such
Damages, as well as any other relevant equitable considerations.  The relative
fault of the Company on the one hand and of the Holders on the other hand will
be determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the Company or by the Holders
and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission; provided, however,
                                                              --------  -------
that in no event shall the obligation of any indemnifying party to contribute
under this Section 7(c) exceed the amount that such indemnifying party would
have been obligated to pay by way of indemnification if the indemnification
provided for under paragraph (a) or (b) of this Section 7 had been available
under the circumstances.

     If indemnification is available under paragraph (a) or (b) of this
Section 7, the indemnifying parties will indemnify each indemnified party to the
full extent provided in such
<PAGE>

paragraphs without regard to the relative benefits to or relative fault of said
indemnifying party or indemnified party or any other equitable consideration
provided for in this Section 7(c).

     The Company and each Holder agrees that it would not be just or equitable
if contribution pursuant to this Section 7(c) were determined by pro rata
allocation or by any other method of allocation that does not take account of
the equitable considerations referred to herein.

     No indemnified party guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any indemnifying party who was not guilty of such fraudulent
misrepresentation.

     (d)  Notice.  Promptly after receipt by an indemnified party under this
          ------
Section 5 of notice of the commencement of any action (including any
governmental action), such indemnified party shall, if a claim in respect
thereof is to made against any indemnifying party under this Section 7, deliver
to the indemnifying party a written notice of the commencement thereof, and the
indemnifying party shall have the right to participate in, and, to the extent
the indemnifying party so desires, jointly with any other indemnifying party
similarly noticed, to assume control of the defense thereof with counsel
mutually satisfactory to the indemnifying party and the indemnified party, as
the case may be; provided, however, that an indemnified party shall have the
                 --------  -------
right to retain its own counsel with the fees and expenses to be paid by the
indemnifying party, if, in the reasonable opinion of counsel retained by the
indemnifying party, the representation by such counsel of the indemnified party
and the indemnifying party would be inappropriate due to actual or potential
differing interests between such indemnified party and any other party
represented by such counsel in such proceeding.  The Company shall pay
reasonable fees for only one separate legal counsel for the Holders.  The
failure to deliver written notice to the indemnifying party within a reasonable
time of the commencement of any such action shall not relieve such indemnifying
party of any liability to the indemnified party under this Section 7, except to
the extent that the indemnifying party is prejudiced in its ability to defend
such action.

     Section 8.  Rule 144.  The Company will use its best efforts to file in a
                 --------
timely manner all reports and other documents required to be filed by it under
the Securities Act and the Exchange Act and will use its best efforts to make
and keep public information available (as defined under Rule 144 under the
Securities Act) at all times from and after 90 days following the effective date
of the Initial Public Offering.  Upon the request of any Holder, the Company
will deliver to such Holder a written statement as to whether it has complied
with such requirements.

     Section 9.  Covenants of Holders.
                 --------------------

     (a)  Each Holder will furnish to the Company such information regarding
such Holder and such Holder's intended method of distribution of the Registrable
Securities as the Company may from time to time reasonably request in writing in
order to comply with the Securities Act and the provisions of this Agreement.
<PAGE>

     (b)  Each Holder will, to the extent required by the Securities Act,
deliver or cause delivery of the Prospectus contained in a Registration
Statement to any purchaser of such Holder's Registrable Securities covered by
such Registration Statement.

     (c)  Each Holder will notify the Company as promptly as practicable of any
inaccuracy or change in information previously furnished by the Holder to the
Company or of the occurrence of any event, in either case as a result of which
any Prospectus contains or would contain an untrue statement of a material fact
regarding the Holder or the Holder's intended method of distribution of the
Registrable Securities or omits or would omit to state any material fact
regarding the Holder or the Holder's intended method of distribution of the
Registrable Securities required to be stated therein or necessary to make the
statements therein not misleading in light of the circumstances then existing,
and promptly furnish to the Company any additional information required to
correct and update any previously furnished information or required so that the
Prospectus will not contain, with respect to the Holder or the Holder's intended
method of distribution of the Registrable Securities, an untrue statement of a
material fact or omit 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.

     (d)  Each Holder whose Registrable Securities are covered by a Registration
Statement filed pursuant to Section 2 or 3 hereof will, if requested by the
Company in the case of a nonunderwritten offering (a "Nonunderwritten Offering"
and,  together with an Underwritten Offering, an "Offering") or if requested by
the managing underwriter(s) in an Underwritten Offering, not effect any public
sale or distribution of any of any securities of the Company of any class
included in such Offering, including a sale pursuant to Rule 144 or Rule 144A
under the Securities Act (except as part of such Offering), during the 15-day
period prior to, and during the 180-day period (or such longer period as may be
required by the managing underwriter(s)) beginning on, the date of pricing of
each Offering, to the extent timely notified in writing by the Company or the
managing underwriter(s).

     Section 10.  Miscellaneous.
                  -------------

     (a)  Amendments and Waivers.  The provisions of this Agreement, including
          ----------------------
this Section 10(a), may not be amended, modified or supplemented, and waivers or
consents to departures from the provisions hereof will not be effective, unless
approved in writing by the Holders of a majority in interest of the Registrable
Securities then outstanding and the Company; provided, however that, with
respect to the Company's approval, the provisions of this Agreement may be
waived only by the written consent of a majority of the Independent Directors of
the party which is the beneficiary of the particular provision being waived and
the provisions of this Agreement may be amended, modified or supplemented only
by the written consent of a majority of the Independent Directors of each of the
parties. The failure of any party to enforce any of the provisions of this
Agreement will in no way be construed as a waiver of such provisions and will
not affect the right of such party thereafter to enforce each and every
provision of this Agreement in accordance with its terms.

     (b)  Notices.  All notices and other communications provided for or
          -------
permitted hereunder shall be in writing and shall be deemed to have been duly
given if delivered personally or sent by facsimile, registered or certified mail
(return receipt requested), postage prepaid or
<PAGE>

courier or overnight delivery service to the Company at the following address
and to each Holder at the address set forth below such Holder's signature to
this Agreement (or at such other address for any party as shall be specified by
like notice, provided that notices of a change of address shall be effective
only upon receipt thereof), and further provided that in case of directions to
amend the Registration Statement pursuant to Section 9, a Holder must confirm
such notice in writing by overnight express delivery with confirmation of
receipt:

          If to the Company:    c-quential, Inc.
                                Seestrasse 185
                                CH-8800 Thalwil, Zurich
                                Attention: President
                                Facsimile No.:

          with a copy to:       Goodwin, Procter & Hoar LLP
                                Exchange Place
                                Boston, Massachusetts 02109
                                Attention: Robert P. Whalen, Jr., P.C.
                                Facsimile No. (617) 523-1231

          If to any Holder, to: The last address (or facsimile number)
                                for such Person set forth in the records
                                of the Company.

     All such notices and other communications will (i) if delivered personally
to the address as provided in this Section 10(b), be deemed given upon delivery,
(ii) if delivered by facsimile transmission to the facsimile number as provided
in this Section 10(b), be deemed given upon receipt of confirmation, (iii) if
delivered by mail in the manner described above to the address as provided in
this Section 10(b), be deemed given on the earlier of the third full Business
Day following the day of mailing or upon receipt, and (iv) if delivered by
overnight courier to the address provided in this Section 10(b), be deemed given
on the earlier of the first Business Day following the date sent by such
overnight courier or upon receipt.

In addition to the manner of notice permitted above, notices given pursuant to
Sections 1 and 6 hereof may be effected telephonically and confirmed in writing
thereafter in the manner described above.

          (c)  Successors and Assigns. This Agreement shall inure to the benefit
               ----------------------
of and be binding upon the successors, assigns and transferees of each of the
parties from ADL or a subsequent Holder shall be entitled to the benefits of and
bound by the obligations under this Agreement only upon execution and delivery
by such transferee to the Company of a joinder agreement reasonably satisfactory
to the Company stating that such transferee agrees to be bound by the terms of
this Agreement as a "Holder."

     (d)  Counterparts.  This Agreement may be executed in any number of
          ------------
counterparts and by the parties hereto in separate counterparts, each of which
when so executed will be deemed to be an original and all of which taken
together will constitute one and the same agreement.
<PAGE>

     (e)  Headings.  The headings in this Agreement are for convenience of
          --------
reference only and will not limit or otherwise affect the meaning hereof.

     (f)  Governing Law.  This Agreement will be governed by and construed in
          -------------
accordance with the laws of the State of Delaware without regard to principles
of conflicts of law.

     (g)  Severability.  In the event that any one or more of the provisions
          ------------
contained herein, or the application thereof in any circumstances, is held
invalid, illegal or unenforceable in any respect for any reason, the validity,
legality and enforceability of any such provision in every other respect and of
the remaining provisions contained herein will not be in any way impaired
thereby, it being intended that all of the rights and privileges of the Holders
will be enforceable to the fullest extent permitted by law.

     (h)  Entire Agreement.  This Agreement is intended by the parties as a
          ----------------
final expression of their agreement and is intended to be the complete and
exclusive statement of the agreement and understanding of the parties hereto in
respect of the subject matter contained herein. There are no restrictions,
promises, warranties or undertakings, other than those set forth or referred to
herein. This Agreement supersedes all prior agreements and understandings
between the parties with respect to such subject matter.

     (i)  Dispute Resolution.  All disputes, controversies or claims between ADL
          ------------------
and the Company arising out of or relating to this Agreement shall be resolved
in accordance with the provisions of the Reorganization Agreement relating to
dispute resolution.

     (j)  Remedies.  In the event of a breach by any party of its obligations
          --------
under this Agreement, any party injured by such breach, in addition to being
entitled to exercise all rights granted by law, including recovery of damages,
will be entitled to specific performance of its rights under this Agreement.
The parties agree that the provisions of this Agreement shall be specifically
enforceable, it being agreed by the parties that the remedy at law, including
monetary damages, for breach of any such provision will be inadequate
compensation for any loss and that any defense in any action for specific
performance that a remedy at law would be adequate is waived.

                                 [End of Text]
<PAGE>

     IN WITNESS WHEREOF, the parties have caused this Registration Rights
Agreement to be duly executed as of the date first set forth above.

                                 C-QUENTIAL, INC.

                                 ____________________________________
                                 Name:
                                 Title:

                                 ARTHUR D. LITTLE, INC.

                                 _____________________________________
                                 Name:
                                 Title:

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