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Securities Purchase Agreement - Alliance Data Systems Corp. and WCAS Capital Partners III LP

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                        SECURITIES PURCHASE AGREEMENT

                                  between

                      ALLIANCE DATA SYSTEMS CORPORATION

                                    and


                       WCAS CAPITAL PARTNERS III, L.P.








                        Dated as of September 15, 1998

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<PAGE>


                              TABLE OF CONTENTS


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                                                                          Page
                                                                          ----
                                                                    
I.     PURCHASE AND SALE OF SECURITIES ...............................      1

       SECTION 1.01     Issuance, Sale and Delivery of the
                         Securities ..................................      2

II.    THE CLOSING ...................................................      2

       SECTION 2.01     Closing Date .................................      2

III.   REPRESENTATIONS AND WARRANTIES OF THE COMPANY .................      2

       SECTION 3.01     Organization, Qualifications and
                         Corporate Power .............................      2
       SECTION 3.02     Authorization of Agreements, Etc. ............      3
       SECTION 3.03     Validity .....................................      3
       SECTION 3.04     Authorized Capital Stock .....................      3
       SECTION 3.05     Governmental Approvals .......................      4
       SECTION 3.06     Offering of the Securities ...................      4
       SECTION 3.07     Accuracy of Representations and
                         Warranties in the Merger Agreement ..........      4
       SECTION 3.08     Financial Statements .........................      5
       SECTION 3.09     Regulations G and X ..........................      5

IV.    REPRESENTATIONS AND WARRANTIES OF THE PURCHASER ...............      5

       SECTION 4.01     Authorization ................................      5
       SECTION 4.02     Validity .....................................      5
       SECTION 4.03     Investment Representations ...................      5

V.     CONDITIONS PRECEDENT ..........................................      7

       SECTION 5.01     Conditions Precedent to the
                         Obligations of the Purchaser ................      7
       SECTION 5.06     Conditions Precedent to the
                         Obligations of the Company ..................      7

VI.    MISCELLANEOUS .................................................      8

       SECTION 6.01     Expenses, Etc. ...............................      8
       SECTION 6.02     Survival of Agreements .......................      8
       SECTION 6.03     Parties in Interest ..........................      9
       SECTION 6.04     Notices ......................................      9
       SECTION 6.05     Entire Agreement; Modifications ..............     10
       SECTION 6.06     Counterparts .................................     10
       SECTION 6.07     Governing Law ................................     10




                                      i

<PAGE>
                       INDEX TO EXHIBITS AND SCHEDULES


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       EXHIBIT          DESCRIPTION
       -------          -----------
                    
          A             Form of 10% Subordinated Note
          B             Form of Amendment to Amended and
                         Restated Stockholders Agreement



                                       ii


<PAGE>

          SECURITIES PURCHASE AGREEMENT, dated as of September 15, 1998,
between ALLIANCE DATA SYSTEMS CORPORATION, a Delaware corporation (the
"Company"), and WCAS CAPITAL PARTNERS III, L.P., a Delaware limited
partnership (the "Purchaser").

          WHEREAS pursuant to an Agreement and Plan of Merger (the "Merger
Agreement") dated as of August 14, 1998 between the Company, HSI Acquisition
Corp., a Minnesota corporation and a wholly-owned subsidiary of the Company
("Merger Subsidiary"), and Harmonic Systems Incorporated, a Minnesota
corporation ("Harmonic"), Merger Subsidiary will merge with and into Harmonic
and Harmonic will become a wholly-owned subsidiary of the Company; and

          WHEREAS in order to finance the transactions contemplated by the
Merger Agreement, the Company wishes to issue and sell on the Closing Date
(as hereinafter defined) to the Purchaser (i) an aggregate of 5,900,000 shares
(collectively, the "Shares") of Common Stock, $.01 par value ("Common Stock"),
of the Company, and (ii) the Company's 10% Subordinated Note Due September 15,
2008 in the principal amount of $52,000,000; and

          WHEREAS the Purchaser wishes to purchase the Shares and said Note,
all on the terms and subject to the conditions hereinafter set forth;

          NOW, THEREFORE, in consideration of the premises and the mutual
covenants herein contained, the parties hereto agree as follows:


                                       I.

                         PURCHASE AND SALE OF SECURITIES

          SECTION 1.01 ISSUANCE SALE AND DELIVERY OF THE SECURITIES.

          (a) Subject to the terms and conditions set forth herein, on the
Closing Date the Company shall issue, sell and deliver to the Purchaser, and
the Purchaser shall purchase from the Company, (i) the Shares and (ii) a 10%
Subordinated Note Due September 15, 2008 of the Company, substantially in the
form of Exhibit A hereto, dated the Closing Date, in the principal amount of
$52,000,000 (such note, and any note or notes issued in exchange or
substitution therefor, being hereinafter called the "Note"). The Company
shall issue a certificate or certificates in definitive form, registered in
the name of the Purchaser, evidencing the Shares. The Shares and the Note are
sometimes collectively referred to herein as the "Securities".


<PAGE>


          (b)  As payment in full for the Securities, and against delivery
thereof as aforesaid, on the Closing Date the Purchaser shall pay to the
Company, by wire transfer of immediately available funds to an account
designated by the Company, the sum of $52,000,000.

                                     II.

                                THE CLOSING

          SECTION 2.01  CLOSING DATE.  The closing of the sale and purchase
of the Securities shall take place at the offices of Reboul, MacMurray,
Hewitt, Maynard & Kristol, 45 Rockefeller Plaza, New York, New York 10111, at
10 a.m., New York time, on September 15, 1998, or at such other date and time
as may be mutually agreed upon by the Purchaser and the Company (such date
and time of the closing being herein called the "Closing Date").

                                     III.

                REPRESENTATIONS AND WARRANTIES OF THE COMPANY

          The Company represents and warrants to the Purchaser as follows:

          SECTION 3.01  ORGANIZATION, QUALIFICATIONS AND CORPORATE POWER.
The Company is a corporation duly incorporated validly existing and in good
standing under the laws of the State of Delaware and is duly licensed or
qualified to transact business as a foreign corporation and is in good
standing in each jurisdiction in which the nature of its business or the
ownership of its properties makes such licensing or qualification necessary,
except where the failure to be so licensed or qualified would not have a
material adverse effect on the business, assets, operations or condition
(financial or other) of the Company (a "Material Adverse Effect"). The
Company has the corporate power and authority to own and hold its properties,
to carry on its business as currently conducted, to execute, deliver and
perform this Agreement, the Note and the Amendment to Amended and Restated
Stockholders Agreement in the form attached hereto as Exhibit B (the
"Stockholders Agreement Amendment") and to issue and deliver the Shares. The
Purchaser has been furnished with true and complete copies of the Company's
Certificate of Incorporation and By-laws, reflecting all amendments thereto
through the date hereof.

          SECTION 3.02  AUTHORIZATION OF AGREEMENTS, ETC.

          (a) The execution and delivery by the Company of this Agreement,
the Note and the Stockholders Agreement Amendment, the
'

                                      2

<PAGE>


performance by the Company of its respective obligations hereunder and
thereunder and the issuance, sale and delivery by the Company of the Shares
have been duly authorized by all requisite corporate action and not (i)
violate any provision of law applicable to the Company, any order of any
court or other agency of government, the Certificate of Incorporation or
By-laws of the Company, or any provision of any indenture, agreement or other
instrument to which the Company or any of its properties or assets is bound,
(ii) conflict with, result in a breach of or constitute (with due notice or
lapse of time or both) a default under any such indenture, agreement or other
instrument, or (iii) result in the creation or imposition of any lien, charge
or encumbrance of any nature whatsoever upon any of the properties or assets
of the Company that, in any such case, would have a Material Adverse Effect.

          (b)  The Shares will, when issued and paid for in accordance with
this Agreement, be validly issued, fully paid and nonassessable shares of
Common  Stock. The issuance, sale and delivery of the Shares to the Purchaser
hereunder is not subject to any preemptive rights of stockholders of the
Company or to any right of first refusal or other similar right in favor of
any person.

          SECTION 3.03  VALIDITY.  This Agreement has been duly executed and
delivered by the Company and constitutes the legal, valid and binding
obligation of the Company, enforceable against the Company in accordance with
its terms, subject, as to enforcement of remedies, to applicable bankruptcy,
insolvency, reorganization, moratorium and similar laws from time to time in
effect affecting the enforcement of creditors' rights generally and to
general equity principles. The Note and the Stockholders Agreement Amendment,
when executed and delivered by the Company as provided in this Agreement,
will constitute legal, valid and binding obligations of the Company,
enforceable against the Company in accordance with their respective terms,
subject, as to enforcement of remedies, to applicable bankruptcy, insolvency,
reorganization, moratorium and similar laws from time to time in effect
affecting the enforcement of creditors' rights generally and to general
equity principles.

          SECTION 3.04  AUTHORIZED CAPITAL STOCK.

               (a) The authorized capital stock of the Company consists of
450 million shares of Common Stock, $.01 par value, of which an aggregate of
421,929,815 shares are validly issued and outstanding, fully paid and
nonassessable.

               (b) Except as contemplated by this Agreement and with respect
to employee stock options outstanding as of the date hereof or to be granted
by the Board of Directors of the Company


                                      3

<PAGE>


from time to time after the date hereof,  (i) no subscription, warrant,
option, convertible security or other right (contingent or other) to purchase
or acquire any shares of any class of capital stock of the Company is
authorized or outstanding and (ii) there is no commitment of the Company to
issue any shares, warrants, options or other such rights or to distribute to
holders of any class of the Company's capital stock, any evidences of
indebtedness or assets and (iii) the Company has no obligation (contingent or
other) to purchase, redeem or otherwise acquire any shares of its capital
stock or any interest therein or to pay any dividend or make any other
distribution in respect thereof.

          SECTION 3.05 GOVERNMENTAL APPROVALS.  No registration or filling
with, or consent or approval of, or other action by, any federal, state or
other governmental agency or instrumentality is or will be necessary for the
valid execution, delivery and performance of this Agreement, the Note and the
Stockholders Agreement Amendment, or the issuance, sale and delivery of the
Shares.

          SECTION 3.06 OFFERING OF THE SECURITIES.  Neither the Company nor
any person authorized or employed by the Company as agent, broker, dealer or
otherwise in connection with the offering or sale of the Securities or any
similar securities of the Company has offered any such securities for sale
to, or solicited any offers to buy any such securities from, or otherwise
approached or negotiated with respect thereto with, any person or persons,
under circumstances that involved the use of any form of general advertising
or solicitation as such terms are defined in Regulation D of the Securities
Act of 1933, as amended (the "Securities Act"); and neither the Company nor
any person acting on the Company's behalf has taken or will take any action
(including, without limitation, any offer, issuance or sale of any securities
of the Company under circumstances which might require the integration of
such transactions with the sale of the Securities under the Securities Act or
the rules and regulations of the Securities and Exchange Commission (the
"Commission") thereunder) which might subject the offering, issuance or sale
of the Note and/or the Shares to the Purchaser to the registration
provisions of the Securities Act.

          SECTION 3.07 ACCURACY OF REPRESENTATIONS AND WARRANTIES IN THE
MERGER AGREEMENT.  The representations and warranties of the Company
contained in Article 4 of the Merger Agreement are true and correct as of the
date hereof and will be true and correct as of the Closing Date in all
material respects.  To the best knowledge of the Company, the representations
and warranties of Harmonic contained in Article 3 of the Merger Agreement are
true and correct as of the date hereof and will be true and correct as of the
Closing Date in all materials respects.

                                       4


<PAGE>


          SECTION 3.08  FINANCIAL STATEMENTS.  The audited financial
statements of the Company at and for the year ended January 31, 19998 and the
unaudited financial statements for the quarterly period ended May 2, 1998,
copies of which have been delivered to the Purchaser, fairly present the
consolidated financial position of the Company as of such dates and the
consolidated income, cash flows and stockholders' equity for the periods
covered thereby.

          SECTION 3.09  REGULATIONS G AND X.  The Company is not engaged in
the business of extending credit for the purpose of purchasing or carrying
margin stock (as defined, from time to time, in Regulation G promulgated by
the Board of Governors of the Federal Reserve System), and no part of the
proceeds from the Note or the Shares or other financing in connection with
the transactions contemplated by the Merger Agreement will be used to
purchase or carry any margin stock or to extend credit to others for the
purpose of purchasing or carrying any margin stock in violation of
Regulations G and X.

                                       IV.
                  REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

          The Purchaser represents and warrants to the Company as follows:

          SECTION 4.01  AUTHORIZATION.  The execution, delivery and
performance by the Purchaser of this Agreement and the Stockholders Agreement
Amendment and the purchase and receipt by the Purchaser of the Securities
have been duly authorized by all requisite action on the part of the Purchaser,
and will not violate any provision of law, any order of any court or other
agency of government applicable to the Purchaser, the governing instrument of
the Purchaser, or any provision of any indenture, agreement or other
instrument by which the Purchaser or any of the Purchaser's properties or
assets are bound, or conflict with result in a breach of or constitute (with
due notice or lapse of time or both) a default under any such indenture,
agreement or other instrument, or result in the creation or imposition of any
lien, charge or encumbrance of any nature whatsoever upon any of the
properties or assets of the Purchaser, that in any case, would have a
material adverse effect on the business, assets, operations or condition
(financial or other) of the Purchaser.

          SECTION 4.02  VALIDITY.  This Agreement has been duly executed and
delivered by the Purchaser and constitutes the legal, valid and binding
obligation of the Purchaser, enforceable against the Purchaser in accordance
with its terms, subject, as to enforcement of remedies, to applicable
bankruptcy, insolvency,


                                        5

<PAGE>

reorganization, moratorium and similar laws from time to time in effect
affecting the enforcement of creditors' rights generally and to general equity
principles.

        SECTION 4.03 INVESTMENT REPRESENTATIONS.

          (a) The Purchaser is acquiring the Securities for its own account,
for investment, and not with a view toward the resale or distribution thereof
in violation of applicable law.

          (b) The Purchaser understands that (i) neither the Note nor the
Shares have been registered under the Securities Act by reason of their
issuance in a transaction exempt from the registration requirements of the
Securities Act pursuant to Section 4(2) thereof, (ii) the Securities must be
held indefinitely unless and subsequent disposition thereof is registered
under the Securities Act or is exempt from such registration, (iii) the Note
and the Shares will bear a legend to such effect and (iv) the Company will
make notations on its transfer books to such effect.

         (c) The Purchaser is able to fend for itself in the transactions
contemplated by this Agreement and that it has the ability to bear the
economic risks of its investment in the Securities for an indefinite period
of time. The Purchaser has had the opportunity to ask questions of, and
receive answers from, officers of the Company with respect to the business
and financial condition of the Company and the terms and conditions of the
offering of the Securities and to obtain additional information necessary to
verify such information or can acquire it without unreasonable effort or
expense.

          (d) The Purchaser has such knowledge and experience in financial
and business matters that it is capable of evaluating the merits and risks of
its investment in the Securities. The Purchaser is an "accredited investor"
as such term is defined in Rule 501 of Regulation D of the Commission under
the Securities Act with respect to its purchase of the Securities, and that
the Purchaser has not been formed solely for the purpose of purchasing the
Securities.

          (e) The Purchaser understands that the exemption from registration
afforded by Rule 144 under the Securities Act depends on the satisfaction of
various conditions and that, if applicable. Rule 144 affords the basis of
sales of the Securities in limited amounts under certain circumstances.

                                       6



<PAGE>

                                      V.

                             CONDITIONS PRECEDENT

          SECTION 5.01  CONDITIONS PRECEDENT TO THE OBLIGATIONS OF THE
PURCHASER. The obligations of the Purchaser hereunder are, at its option,
subject to the satisfaction, on or before the Closing Date, of the following
conditions:

          (a) REPRESENTATION AND WARRANTIES TO BE TRUE AND CORRECT.  The
representations and warranties of the Company contained in this Agreement
shall be true and correct in all material respects on the Closing Date, with
the same force and effect as though such representations and warranties had
been made on and as of such date.

          (b) PERFORMANCE.  The Company shall have performed and complied
with all agreements and conditions contained herein required to be performed
or complied with by it prior to or on the Closing Date.

          (c) ALL PROCEEDINGS TO BE SATISFACTORY.  All corporate and other
proceedings to be taken by the Company and all waivers and consents to be
obtained by the Company in connection with the transactions contemplated
hereby shall have been taken or obtained by the Company and all documents
incident thereto shall be satisfactory in form and substance to the
Purchaser and its counsel.

          (d) MERGER AGREEMENTS.  The transactions contemplated by the Merger
Agreement shall have been consummated on or prior to the Closing Date in
accordance with the Merger Agreement as originally executed, without any
material amendments or waivers.

          (e)  STOCKHOLDERS AGREEMENT AMENDMENT.  On the Closing Date, the
Stockholders Agreement Amendment shall have been fully executed.

          SECTION 5.02  CONDITIONS PRECEDENT TO THE OBLIGATIONS OF THE
COMPANY.  The obligations of the Company hereunder are, at its option, subject
to the satisfaction, on or before the Closing Date, of the following
conditions:

          (a) REPRESENTATIONS AND WARRANTIES TO BE TRUE AND CORRECT.  The
representations and warranties of the Purchaser contained in this Agreement
shall be true and correct in all material respects on the Closing Date, with
the same effect as though such representations and warranties had been made
on and as of such date.

                                      7

<PAGE>

          (b)  PERFORMANCE.  The Purchaser shall have performed and complied
with all agreements and conditions contained herein required to be performed
or complied with by it prior to or on the Closing Date.

          (c)  ALL PROCEEDINGS TO BE SATISFACTORY.  All proceedings to be
taken by the Purchaser and all waivers and consents to be obtained by the
Purchaser in connection with the transactions contemplated hereby shall have
been taken or obtained by the Purchaser and all documents incident thereto
shall be satisfactory in form and substance to the Company and its counsel.

          (d)  MERGER AGREEMENT.  The transactions contemplated by the Merger
Agreement shall have been consummated on or prior to the Closing Date in
accordance with the Merger Agreement.


                                   VI.

                              MISCELLANEOUS

          SECTION 6.01  EXPENSES, ETC.  Each party hereto will pay its own
expenses in connection with the transactions contemplated by this Agreement,
whether or not such transactions shall be consummated; PROVIDED, HOWEVER,
that the Company shall pay the reasonable fees and disbursements of Reboul,
MacMurray, Hewitt, Maynard & Kristol, the Purchaser's counsel. Each party
hereto will indemnify and hold harmless the other against and in respect of
any claim for brokerage or other commissions relative to this Agreement or to
the transactions contemplated hereby, made as a result of any agreements,
arrangements or understanding made or claimed to have been made by such party
with any third party.

          SECTION 6.02  SURVIVAL OF AGREEMENTS.  All covenants, agreements,
representations and warranties made herein shall survive the execution and
delivery of this Agreement and the issuance, sale and delivery of the
Securities pursuant hereto and all statements contained in any certificate or
other instrument delivered by the Company hereunder shall be deemed to
constitute representations and warranties made by the Company.

          SECTION 6.03  PARTIES IN INTEREST.  All covenants and agreements
contained in this Agreement by or on behalf of either 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, except for transferees in
a Public Sale. For the purposes of this Agreement, "Public Sale" means any
sale of Shares to the public pursuant to an offering registered under the
Securities Act or to the public pursuant to the provisions of

                                   8


<PAGE>


Rule 144 (or any successor or similar rule) adopted under the Securities Act.

          SECTION 6.04  NOTICES.  Any notice or other communications required
or permitted hereunder shall be deemed to be sufficient if contained in a
written instrument delivered in person or duly sent by first class certified
mail, postage pre-paid, or by telecopy addressed to such party at the address
or telecopy number set forth below or such other address or telecopy number as
may hereafter be designated in writing by the addressee to the addressor
listing all parties:

          if to the Company, to:

               Alliance Data Systems Corporation
               5001 Spring Valley Road, Suite 650W
               Dallas, Texas 75244
               Attention:  General Counsel and Chief Financial Officer
               Telecopy Number:  (972) 960-5330

          if to the Purchaser, to it at:

               c/o Welsh, Carson, Anderson & Stowe
               320 Park Avenue
               Suite 2500
               New York, New York 10022
               Attention:  Anthony J. deNicola
               Telecopy Number:  (212) 945-2016

               with a copy to:

               Reboul, MacMurray, Hewitt, Maynard & Kristol
               45 Rockefeller Plaza
               New York, New York 10111
               Attention:  Robert A. Schwed, Esq.
               Telecopy Number:  (212) 841-5725

or, in any case, at such other address or addresses as shall have been
furnished in writing by such party to the other party hereto. All such
notices, requests, consents and other communications shall be deemed to have
been received (a) in the case of personal delivery, on the date of such
delivery, (b) in the case of mailing, on the fifth business day following the
date of such mailing and (c) in the case of telecopy, when received.

          SECTION 6.05  ENTIRE AGREEMENT; MODIFICATIONS.  This Agreement
constitutes the entire agreement of the parties with respect to the subject
matter hereof and may not be amended or modified nor any provisions waived
except in a writing signed by the Company and holders owning an aggregate of
not less than 66-


                                      9


<PAGE>


2/3% of the outstanding principal amount of the outstanding notes and not
less than 66-2/3% of the outstanding shares of Common Stock issued hereunder
and not previously transferred in a Public Sale.

          SECTION 6.06  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.

          SECTION 6.07  GOVERNING LAW.  This Agreement shall be governed by
and construed in accordance with the laws of the State of New York.


                                      10

<PAGE>


          IN WITNESS WHEREOF, the Company and the Purchaser have executed
this Agreement as of the day and year first above written.


                                             ALLIANCE DATA SYSTEMS CORPORATION


                                             By /s/ Edward K. Mims
                                                ------------------------------
                                                Title: EVP & CFO


                                             WCAS CAPITAL PARTNERS III, L.P.
                                             By WCAS CP III Partners,
                                                General Partner


                                             By /s/ Laura Van Buren
                                                -----------------------------
                                                General Partner



                                      11


<PAGE>
                                                         EXHIBIT A


     THIS NOTE IS ISSUED WITH ORIGINAL ISSUE DISCOUNT ("OLD")
     AS DEFINED BY SECTION 1273(a)(1) OF THE INTERNAL REVENUE
      CODE OF 1986, AS AMENDED. THE FOLLOWING INFORMATION IS
    PROVIDED PURSUANT TO THE INFORMATION REPORTING REQUIREMENTS
     SET FORTH IN PROPOSED TREASURY REGULATION 1.1275-3.


     THE ISSUE PRICE OF THIS DEBT INSTRUMENT IS $45,510,000.
     THE AMOUNT OF OID ON THIS DEBT INSTRUMENT IS $6,490,000.
   THE ISSUE DATE OF THIS DEBT INSTRUMENT IS SEPTEMBER 15, 1998.
      THE YIELD TO MATURITY OF THIS DEBT INSTRUMENT IS 14.46%

       THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES
      ACT OF 1933 AND MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE
       DISPOSED OF UNLESS IT HAS BEEN REGISTERED UNDER THAT ACT
            OR AN EXEMPTION FROM REGISTRATION IS AVAILABLE.


                     ALLIANCE DATA SYSTEMS CORPORATION


                           10% Subordinated Note
                           Due September 15, 2008


Registered                                      New York, New York
R-001                                           September 15, 1998
$52,000,000

          ALLIANCE DATA SYSTEMS CORPORATION, a Delaware corpora-
tion (hereinafter called the "Company"), -for value received,
hereby promises to pay to WCAS CAPITAL PARTNERS III, L.P., a
Delaware limited partnership, or registered assigns, the princi-
pal sum of FIFTY-TWO MILLION AND NO/100 Dollars ($52,000,000), in
two equal installments on September 15, 2007 and September 15,
2008, and to pay interest (computed on the basis of a 360-day
year consisting of twelve 30-day months) from the date hereof on
the unpaid principal amount hereof at the rate of 10% per annum,
payable semi-annually in arrears on the fifteenth day of March
and September of each year (each said day being an "Interest
Payment Date"), commencing on March 15,1999, until the principal
amount hereof shall have become due and payable, whether at
maturity or by acceleration or otherwise, and thereafter at the
rate of 12% per annum on any overdue principal amount and (to the
extent permitted by applicable law) on any overdue interest until
paid.

<PAGE>

          All payments of principal and interest on this Note shall be in
such coin or currency of the United States of America as at the time of
payment shall be legal tender for payment of public and private debts.

          For purposes of this Note, "Business Day" shall mean any day other
than a Saturday, Sunday or a legal holiday under the laws of the state of New
York.

          1. NOTES. This Note is one of a duly authorized issue of
Subordinated Notes (herein called the "Notes") made or to be made by the
Company in the aggregate principal amount of $52,000,000, maturing on
September 15, 2008 and bearing interest payable at the same rate and on the
same dates as the interest on the principal amount of this Note.

          2. TRANSFER, ETC. OF NOTES. The Company shall keep at its office or
agency maintained as provided in paragraph (a) of Section 11 a register in
which the Company shall provide for the registration of Notes and for the
registration of transfer and exchange of Notes. The holder of this Note may,
at its option, and either in person or by duly authorized attorney, surrender
the same for registration of transfer or exchange at the office or agency of
the Company maintained as provided in paragraph (a) of Section 11, and,
without expense to such holder (except for taxes or governmental charges
imposed in connection therewith), receive in exchange therefor a Note or
Notes each in such denomination or denominations as such holder may request,
dated as of the date to which interest has been paid on the Note or Notes so
surrendered for transfer or exchange, for the same aggregate principal amount
as the then unpaid principal amount of the Note or Notes so surrendered for
transfer or exchange, and registered in the name of such person or persons as
may be designated by such holder. Every Note presented or surrendered for
registration of transfer of exchange shall be duly endorsed, or shall be
accompanied by a written instrument of transfer, satisfactory in form to the
Company, duly executed by the holder of such Note or his attorney duly
authorized in writing. Every Note so made and delivered in exchange for this
Note shall in all other respects be in the same form and have the same terms
as this Note. No transfer or exchange of any Note shall be valid unless made
in the foregoing manner at such office or agency.

          3. LOSS, THEFT, DESTRUCTION OR MUTILATION OF NOTE. Upon receipt of
evidence satisfactory to the Company of the loss, theft, destruction or
mutilation of this Note, and, in the case of any such loss, theft or
destruction, upon receipt of an affidavit of loss and indemnity from the
holder hereof reasonably satisfactory to the Company, or, in the case of any
such mutilation, upon surrender and cancellation of this Note, the Company
will make and deliver, in lieu of this Note, a new Note of like

                                      2

<PAGE>

tenor and unpaid principal amount and dated as of the date to which interest
has been paid on this Note.

         4.   PERSONS DEEMED OWNERS; HOLDERS. The Company may deem and treat
the person in whose name any Note is registered as the owner and holder of
such Note for the purpose of receiving payment of principal of and interest
on such Note and for all other purposes whatsoever, whether or not such Note
shall be overdue. With respect to any Note at any time outstanding, the term
"holder", as used herein, shall be deemed to mean the person in whose name
such Note is registered as aforesaid at such time.

         5.   PAYMENT IN KIND. On March 15 and September 15 of each year
during the term of this Note (each an "Eligible Interest Payment Date"), the
Company may elect to satisfy its obligation to pay interest on this Note by
issuing to the holder hereof a deferred interest note or notes in
substantially the form hereof (which note or notes shall hereinafter be
called the "Deferred Interest Notes") in a principal amount equal to the
interest that would have been payable to such holder on such Eligible
Interest Payment Date. If the Company shall so elect, it shall deliver to the
holder a certificate of the officer of the Company, not less than five
Business Days prior to the Eligible Interest Payment Date, stating that the
Company will pay such interest in the form of Deferred Interest Notes,
together with a resolution of the Board of Directors of the Company
authorizing the issuance of Deferred Interest Notes in the appropriate
principal amount, and a representation that such Deferred Interest Notes will
be binding obligations of the Company, enforceable in accordance with their
terms.

         6.   PREPAYMENTS.

               (a) OPTIONAL PREPAYMENT. Upon notice given as provided in
    Section 7 the Company may, at its option, prepay the Notes, as a whole at
    any time or in part from time to time, in amounts which shall be integral
    multiples of $100,000, at the unpaid principal amount thereof so to be
    prepaid, together with interest accrued thereon to the date fixed for
    such prepayment. All prepayments shall be applied to installments of
    principal hereof in inverse order of maturity.

              (b) MANDATORY PREPAYMENT UPON PUBLIC OFFERING. If at any time
    while any of the Notes shall be outstanding the Company shall consummate
    a public offering of equity securities of the Company pursuant to an
    effective registration statement under the Securities Act, then upon the
    consummation of each such offering the Company shall apply to prepayment
    of the Notes (to the extent permitted under

                                      3

<PAGE>

     the Company's Credit Agreement, dated as of July 24, 1998 (as amended
     the "Credit Agreement") with Morgan Guaranty Trust Company of New York,
     as Agent), without penalty or premium (up to the amount required to
     prepay all the Notes including accrued interest thereon) an amount that,
     including principal to be prepaid and accrued interest thereon, is equal
     to one-third of the proceeds of such offering to the Company (net of
     underwriting discounts and commissions).

               (c) MANDATORY OID PREPAYMENT. To the extent permitted by the
     Credit Agreement, on any interest payment date on or after September 15,
     2003, the Company must pay an amount of accrued original issue discount on
     this Note as shall be necessary to ensure that this Note shall not be
     considered an "applicable high yield discount obligation" within the
     meaning of Section 163(i) of the Internal Revenue Code of 1986, as
     amended, or any successor provision. The amount of interest payable on
     this Note at maturity shall be reduced by the amount of any accrued
     original issue discount that is paid under this Section 5(c).

          7. NOTICE OF PREPAYMENT AND OTHER NOTICES. The Company shall give
written notice of any prepayment of this Note or any portion hereof pursuant
to Section 6 not less than 10 nor more than 60 days prior to the date fixed
for such prepayment. Such notice of prepayment and all other notices to be
given to any holder of this Note shall be given by registered or certified
mail to the person in whose name this Note is registered at its address
designated on the register maintained by the Company on the date of mailing
such notice of prepayment or other notice. Upon notice of prepayment being
given as aforesaid, the Company covenants and agrees that it will prepay, on
the date therein fixed for prepayment, this Note or the portion hereof, as
the case may be, so called for prepayment, at the principal amount thereof so
called for prepayment together with interest accrued thereon to the date
fixed for such prepayment.

          8. ALLOCATION OF PREPAYMENT. In the event of any prepayment,
purchase, redemption or retirement of less than all of the outstanding Notes,
the Company will allocate the principal amount so to be prepaid, purchased,
redeemed or retired (but only in units of $100,000) to each Note in
proportion, as nearly as may be, to the aggregate principal amount of all
Notes then outstanding.

          9. INTEREST AFTER DATE FIXED FOR PREPAYMENT. If this Note or a
portion hereof is called for prepayment as herein provided, this Note or such
portion shall cease to bear interest on and after the date fixed for such
prepayment unless, upon presentation for the purpose, the Company shall fail
to pay this Note or such portion, as the case may be, in which event this
Note or

                                      4


<PAGE>


such portion, as the case may be, and, so far as may be lawful, any overdue
installment of interest, shall bear interest on and after the date fixed for
such prepayment and until paid at the rate PER ANNUM provided herein for
overdue principal.

         10. SURRENDER OF NOTES; NOTATION THEREON. Upon any prepayment of a
portion of the principal amount of this Note, the holder hereof, at its
option, may require the Company to execute and deliver at the expense of the
Company (except for taxes or governmental charges imposed in connection
therewith), upon surrender of this Note, a new Note registered in the name of
such person or persons as may be designated by such holder for the principal
amount of this Note then remaining unpaid, dated as of the date to which
interest has been paid on the principal amount of this Note then remaining
unpaid, or may present this Note to the Company for notation hereon of the
payment of the portion of the principal amount of this Note so prepaid.

         11.  COVENANTS. The Company covenants and agrees that, so long as
any Note shall be outstanding:

         (a)  MAINTENANCE OF OFFICE.  The Company will maintain an office or
     agency in such place in the United States of America as the Company may
     designate in writing to the registered holder hereof, where the Notes
     may be presented for registration of transfer and for exchange as herein
     provided, where notices and demands to or upon the Company in respect of
     the Notes may be served and where, at the option of the holders thereof,
     the Notes may be presented for payment.

         (b)  PAYMENT OF TAXES.  The Company will promptly pay and discharge
     or cause to be paid and discharged, before the same shall become in
     default, all lawful taxes and assessments imposed upon the Company or any
     subsidiary or upon the income and profits of the Company or any
     subsidiary, or upon any property, real, personal or mixed, belonging to
     the Company or any subsidiary, or upon any part thereof by the United
     States or any State thereof, as well as all lawful claims for labor,
     materials and supplies which, if unpaid, would become a lien or charge upon
     such property or any part thereof; PROVIDED, HOWEVER, that neither the
     Company nor any subsidiary shall be required to pay and discharge or to
     cause to be paid and discharged any such tax, assessment, charge, levy
     or claim so long as both (x) the Company has set aside adequate reserves
     for such tax, assessment, charge, levy or claim and (y) (i) the Company
     or a subsidiary shall be contesting the validity thereof in good faith by
     appropriate proceedings or (ii) the Company shall, in its good faith
     judgment, deem the validity thereof to be questionable and the party to
     whom such tax, assessment, charge,

                                      5






<PAGE>

      levy or claim is allegedly owed shall not have made written demand for
      the payment thereof.

           (c)  CORPORATE EXISTENCE.  The Company will do or cause to be done
      all things necessary and lawful to preserve and keep in full force and
      effect its corporate existence, rights and franchises and the corporate
      existence, rights and franchises of each of its subsidiaries; PROVIDED,
      HOWEVER, that nothing in this paragraph (c) shall prevent the
      abandonment or termination of any rights or franchises of the Company,
      or the liquidation or dissolution of, or a sale, transfer or disposition
      (whether through merger, consolidation, sale or otherwise) of all or any
      substantial part of the property and assets of, any subsidiary or the
      abandonment or termination of the corporate existence, rights and
      franchises of any subsidiary if such abandonment, termination,
      liquidation, dissolution, sale, transfer or disposition is, in the good
      faith business judgment of the Company, in the best interests of the
      Company and is not disadvantageous in any material respect to the
      holders of the Notes.

           (d)  MAINTENANCE OF PROPERTY.  The Company will at all times
      maintain and keep, or cause to be maintained and kept, in good repair,
      working order and condition all significant properties of the Company
      and its subsidiaries used in the conduct of the business of the Company
      and its subsidiaries, and will from time to time make or cause to be
      made all needful and proper repairs, renewals, replacement, betterments
      and improvements thereto, so that the business carried on in connection
      therewith may be properly and advantageously conducted at all times;
      PROVIDED, HOWEVER, that nothing in this paragraph (d) shall require (i)
      the making of any repair or renewal or (ii) the continuance of the
      operation and maintenance of any property or (iii) the retention of any
      assets if such action (or inaction) is, in the good faith business
      judgment of the Company, in the best interests of the Company (and the
      best interests of any subsidiary concerned or affected thereby) and is
      not disadvantageous in any material respect to the holders of the Notes.

           (e)  INSURANCE.  The Company will, and will cause each of its
      subsidiaries to, (i) keep adequately insured, by financially sound and
      reputable insurers, all property of a character usually insured by
      corporations engaged in the same or a similar business similarly situated
      against loss or damage of the kinds customarily insured against by such
      corporations and (ii) carry, with financially sound and reputable
      insurers, such other insurance (including, without limitation, liability
      insurance) in such amounts as are available at reasonable expense and to
      the extent believed

                                6

<PAGE>


     necessary in the good faith business judgment of the Company.

          (f)  KEEPING OF BOOKS.  The Company will at all times keep, and
     cause each of its subsidiaries to keep, proper books of record and
     account in which proper entries will be made of its transactions with
     generally accepted accounting principles consistently applied.

          (g)  TRANSACTIONS WITH AFFILIATES.  The Company will enter into any
     transaction with any director, officer, stockholder, employee or
     affiliate of the Company only upon fair and reasonable terms.

          (h)  NOTICE OF DEFAULT.  If any one or more events which
     constitute, or which with notice or lapse of time or both would
     constitute, an Event of Default under Section 12 shall occur, or if the
     holder of any Note shall demand payment or take any other action
     permitted upon the occurrence of any such Event of Default, the
     Company shall, immediately after it becomes aware that any such event
     has occurred or that such demand has been made or that any such action
     has been taken, give notice to all holders of the Notes, specifying the
     nature of such event or of such demand or action, as the case may be;
     PROVIDED, HOWEVER, that if such event, in the good faith judgment of the
     Company, will be cured within ten days after the Company has knowledge
     that such event would, with or without notice or lapse of time or both,
     constitute such an Event of default, no such notice need be given if
     such Event of Default shall be cured within such ten-day period.

          12.  MODIFICATION BY HOLDERS; WAIVER. The Company may, with the
written consent of the holders of not less than 66 2/3% in principal amount
of the Notes then outstanding, modify the terms and provisions of the Notes
or the rights of the holders of the Notes or the obligations of the Company
thereunder, and the observance by the Company of any term or provision of the
Notes may be waived with the written consent of the holders of not less than
66 2/3% in principal amount of the Notes then outstanding; PROVIDED, HOWEVER,
that no such modification or waiver shall

          (a)  change the maturity of any Note or reduce the principal amount
     thereof or reduce the rate or extend the time of payment of interest
     thereon without the consent of the holder of each Note so affected; or

          (b)  give any Note any preference over any other Note;

          (c)  reduce the percentage of Notes, the consent of the holders of
     which is required for any such modification; or


                                      7

<PAGE>

         (d) amend the provisions of Section 17 hereof without the consent of
    the holders of Senior Indebtedness (as hereinafter defined).

         Any such modification or waiver shall apply equally to all the
holders of the Notes and shall be binding upon them, upon each future holder
of any Note and upon the Company, whether or not such Note shall have been
marked to indicate such modification or waiver, but any Note issued
thereafter shall bear a notation referring to any such modification or
waiver. Promptly after obtaining the written consent of the holders as herein
provided, the Company shall transmit a copy of such modification or waiver to
all the holders of the Notes at the time outstanding.

         13. EVENTS OF DEFAULT. If any one or more of the following events,
herein called Events of Default, shall occur, for any reason whatsoever, and
whether such occurrence shall, on the part of the Company or any subsidiary,
be voluntary or involuntary or come about or be effected by operation of law
or pursuant to or in compliance with any judgment, decree or order of a court
of competent jurisdiction or any order, rule or regulation of any
administrative or other governmental authority and such Event of Default
shall be continuing:

         (a) default shall be made in the payment of the principal of any
    Note when and as the same shall become due and payable, whether at
    maturity or at a date fixed for prepayment or by acceleration or
    otherwise; or

         (b) default shall be made in the payment of any installment of
    interest on any Note according to its terms when and as the same shall
    become due and payable and such default shall continue for a period of
    five days; or

         (c) default shall be made in the due observance or performance of
    any other covenant, condition or agreement on the part of the Company to
    be observed or performed pursuant to the terms hereof or of the
    Securities Purchase Agreement dated as of September 15, 1998 among the
    Company and the Purchaser (the "Purchase Agreement"), and such default
    shall continue for 30 days after written notice thereof, specifying such
    default and requesting that the same be remedied, shall have been given
    to the Company by the holder or holders of at least 25% of the principal
    amount of the Notes then outstanding (the Company to give forthwith to
    all other holders of Notes at the time outstanding written notice of the
    receipt of such notice specifying the default referred to therein); or


                                       8

<PAGE>

          (d) any representation or warranty made by the Company in the
     Purchase Agreement shall prove to have been false or incorrect in any
     material respect on the date on or as of which made; or

          (e) the entry of a decree or order for relief by a court having
     jurisdiction in the premises in respect of the Company or any subsidiary
     in an involuntary case under the federal bankruptcy laws, as now
     constituted or hereafter amended, or any other applicable federal or
     state bankruptcy, insolvency or other similar laws, or appointing a
     receiver, liquidator, assignee, custodian, trustee, sequestrator (or
     similar official) of the Company or any subsidiary or for any
     substantial part of any of their property, or ordering the winding-up or
     liquidation of any of their affairs and the continuance of any such
     decree or order unstayed and in effect for a period of 60 consecutive
     days; or

          (f) the commencement by the Company or any subsidiary of a
     voluntary case under the federal bankruptcy laws, as now constituted or
     hereafter amended, or any other applicable federal or state bankruptcy,
     insolvency or other similar laws, or the consent by any of them to the
     appointment of or taking possession by a receiver, liquidator, assignee,
     trustee, custodian, sequestrator (or other similar official) of the
     Company or any subsidiary or for any substantial part of their property,
     or the making by any of them of any assignment for the benefit of
     creditors, or the failure of the Company or any subsidiary generally to
     pay its debts as such debts become due; or

          (g) default as defined in any instrument evidencing or under which
     the Company or any subsidiary has outstanding at the time any
     indebtedness for money borrowed in excess of $50,000 in aggregate
     principal amount shall occur and as a result thereof the maturity of any
     such indebtedness shall have been accelerated so that the same shall
     have become due and payable prior to the date on which the same would
     otherwise have become due and payable and such acceleration shall not
     have been rescinded or annulled within 30 days; or

          (h) final judgment for the payment of money in excess of $50,000
     shall be rendered against the Company or a subsidiary and the same shall
     remain undischarged for a period of 30 days during which execution shall
     not be effectively stayed;

then, the holder or holders of a least 26% in aggregate principal amount of
the Notes at the time outstanding may, at its or their option, by notice to
the Company, declare all the Notes to be,

                                       9


<PAGE>

and all the Notes shall thereupon be and become, forthwith due and payable
together with interest accrued thereon without presentment, demand, protest
or further notice of any kind, all of which are expressly waived to the
extent permitted by law.

          At any time after any declaration of acceleration as to all of the
Notes has been made as provided in this Section 13, the holders of at least
66 2/3% in principal amount of the Notes then outstanding may, by notice to
the Company, rescind such declaration and its consequences, if (i) the
Company has paid all overdue installments of interest on the Notes and all
principal that has become due otherwise than by such declaration of
acceleration and (ii) all other defaults and Events of Default (other than
nonpayments of principal and interest that have become due solely by reason
of acceleration) shall have been remedied or cured or shall have been waived
pursuant to this paragraph, PROVIDED, HOWEVER, that no such rescission shall
extend to or affect any subsequent default or Event of Default or impair any
right consequent thereon.

          14. SUITS FOR ENFORCEMENT. In case any one or more of the Events of
Default specified in Section 13 of this Note shall occur and be continuing,
the holder of this Note may proceed to protect and enforce its rights by suit
in equity, action at law and/or by other appropriate proceeding, whether for
the specific performance of any covenant or agreement contained in this Note
or in aid of the exercise of any power granted in this Note, or may proceed
to enforce the payment of this Note or to enforce any other legal or
equitable right of the holder of this Note.

          In case of any  default under any Note, the Company will pay to the
holder thereof such amounts as shall be sufficient to cover the costs and
expenses of such holder due to said default, including, without limitation,
collection costs and reasonable attorneys' fees, to the extent actually
incurred.

          15. REMEDIES CUMULATIVE. No remedy herein conferred upon the holder
of this Note is intended to be exclusive of any other remedy and each and
every such remedy shall be cumulative and shall be in addition to every other
remedy given hereunder or now or hereafter existing at law or in equity or by
statute or otherwise.

          16. REMEDIES NOT WAIVED. No course of dealing between the Company
and the holders of this Note or any delay on the part of the holder hereof in
exercising any rights hereunder shall operate as a waiver of any right of any
holder of this Note.

          17. SUBORDINATION. (a) SUBORDINATION. Anything in this Note to the
contrary notwithstanding, the obligation of the Company to pay the principal
of and interest on this

                                       10





<PAGE>


Note, and to discharge all its other obligations hereunder, shall be
subordinate and junior in right of payment to the extent set forth in the
following paragraphs (A), (B) and (C), inclusive, to (i) all obligations of
the Company to banks or other financial institutions for borrowed money
(including under the Credit Agreement), and (ii) all obligations of the
Company to banks or other financial institutions under guarantees by the
Company of obligations of wholly owned subsidiaries of the Company to banks
or other financial institutions for borrowed money, in each case, whether
such obligations are outstanding at the date of this Note or created or
incurred after the date of this Note but prior to the maturity of this Note.
The obligations of the Company to which this Note is subordinate and junior
in right of payment are sometimes herein referred to as "Senior Indebtedness".

               (A)  In the event of any insolvency, bankruptcy, liquidation,
     reorganization or other similar proceedings, or any receivership
     proceedings in connection therewith, relative to the Company or its
     creditors or its property, and in the event of any proceedings for
     voluntary liquidation, dissolution or other winding up of the Company,
     whether or not involving insolvency or bankruptcy proceedings, then all
     Senior Indebtedness shall first be paid in full, before any payment on
     account of principal or interest is made upon this Note.

               (B)  In any of the proceedings referred to in paragraph (A)
     above, any payment or distribution of any kind or character, whether in
     cash, property, stock or obligations which may be payable or deliverable
     in respect of this Note shall be paid or delivered directly to the
     holders of Senior Indebtedness for application in payment thereof,
     unless and until all Senior Indebtedness shall have been paid in full.

               (C)  In the event the Company shall default under any Senior
     Indebtedness obligation held by any bank or other financial institution,
     which default shall continue without cure or waiver, and the effect of
     such default is to accelerate the maturity of such obligation or the
     holder thereof shall cause such obligation to become due prior to the
     stated maturity thereof or the Company shall not pay such obligation at
     maturity, the Company will not make, directly or indirectly, to the
     holder of this Note any payment of any kind of or on account of all or
     any part of this Note, and the holder of this Note will not accept from
     the Company any payment of any kind of or on account of all or any

                                       11



<PAGE>

      part of this Note, unless and until all such Senior Indebtedness shall
      have been paid in full; and if, with respect to any such default, the
      holder of such Senior Indebtedness obligation shall have made a demand
      for payment and commenced an action, suit or other proceeding against
      the Company, then the holder of this Note may not take, demand, receive,
      sue for, accelerate or commence any remedial proceedings with respect to
      any amount payable under this Note during the pendency of such action,
      suit or other proceeding. Notwithstanding the provisions of the
      immediately preceding sentence, if any such default shall have continued
      for 180 days or more, the Company may make and the holder of this Note
      may accept from the Company all past due and current payments of any
      kind of or on account of this Note, and such holder may demand, receive,
      retain, sue for or otherwise seek enforcement or collection of all
      amounts payable on account of principal of or interest on this Note.

Upon request of any holder of Senior Indebtedness, the holder of this Note
will affirm its obligations under this Section 17.

           (b)  SUBROGATION.  Subject to the payment in full of all Senior
      Indebtedness as aforesaid, the holder of this Note shall be subrogated
      to the rights of the holders of Senior Indebtedness to receive payments
      or distributions of any kind or character, whether in cash, property,
      stock or obligations, which may be payable or deliverable to the holders
      of Senior Indebtedness, until the principal of, and interest on, this
      Note shall be paid in full, and, as between the Company, its creditors
      other than the holders of Senior Indebtedness, and the holder of this
      Note, no such payment or distribution made to the holders of Senior
      Indebtedness by virtue of this Section 17 which otherwise would have
      been made to the holder of this Note shall be deemed a payment by the
      Company on account of the Senior Indebtedness, it being understood that
      the provisions of this Section 17 are and are intended solely for the
      purposes of defining the relative rights of the holder of this Note, on
      the one hand, and the holder of the Senior Indebtedness, on the other
      hand. Subject to the rights, if any, under this Section 17 of holders of
      Senior Indebtedness to receive cash, property, stock or obligations
      otherwise payable or deliverable to the holder of this Note, nothing
      herein shall either impair, as between the Company and the holder of
      this Note, the obligation of the Company, which is unconditional and
      absolute, to pay to the holder hereof the principal hereof and interest
      hereon in accordance with its terms and the provisions of this Note or
      prevent the holder of this

                                 12
<PAGE>

      Note from exercising all remedies otherwise permitted by applicable law
      or upon default hereunder.

          18.  COVENANTS BIND SUCCESSORS AND ASSIGNS.  All the covenants,
stipulations, promises and agreements in this Note contained by or on behalf
of the Company shall bind its successors and assigns, whether so expressed or
not.

          19.  GOVERNING LAW.  This Note shall be governed and construed in
accordance with the laws of the State of New York.



                                    13
<PAGE>

          20.  HEADINGS.  The headings of the Sections and paragraphs of this
Note are inserted for convenience only and do not constitute a part of this
Note.

          IN WITNESS WHEREOF, ALLIANCE DATA SYSTEMS CORPORATION has caused
this Note to be signed in its corporate name by one of its officers thereunto
duly authorized and to be dated as of the day and year first above written.

                               ALLIANCE DATA SYSTEMS CORPORATION



                               By         /s/ [Illegible]
                                 --------------------------------------
                                 Title:  EVP & CFO





                                      14



<PAGE>



                                                              EXHIBIT B

          AMENDMENT TO AMENDED AND RESTATED STOCKHOLDERS AGREEMENT




     AMENDMENT, dated SEPTEMBER 15, 1998, to AMENDED AND RESTATED
STOCKHOLDERS AGREEMENT, dated as of August 30, 1996 (as amended to date, the
"Stockholders Agreement"), among Alliance Data Systems Corporation (known in
the original Stockholders Agreement as World Financial Network Holding
Corporation) (the "Issuer"), Limited Commerce Corp. ("Limited Commerce"),
Welsh, Carson, Anderson & Stowe VII, L.P., Welsh, Carson, Anderson & Stowe
VIII, L.P., the several investors named on Annex I thereto and WCAS Capital
Partners III, L.P. ("WCAS CP III").

     WHEREAS, the Issuer and WCAS CP III have entered into a Securities
Purchase Agreement dated as of the date hereof (the "Purchase Agreement"),
whereby WCAS CP III has agreed to purchase (i) an aggregate of 5,900,000
shares of Common Stock (the "Shares"), par value $.01 per share, of the
Issuer, and (ii) the Issuer's 10% Subordinated Note Due September 15, 2008 in
the principal amount of $52,000,000;

     WHEREAS, the parties hereto desire to amend the Stockholders Agreement
to include the Shares in such agreement and to include WCAS CP III as a party
thereto;

    NOW THEREFORE, the parties hereto agree as follows:

          SECTION 1.  DEFINITIONS.  Capitalized terms used herein without
definition shall have the meanings ascribed to them in the Stockholders
Agreement.

          SECTION 2.  AGREEMENT.    WCAS CP III shall for all purposes be
deemed a "WCAS Investor" and a "Holder" under the Stockholders Agreement.
The Shares to be purchased by WCAS CP III pursuant to the Purchase Agreement
shall for all purposes be deemed "Common Stock" and "Registrable Securities"
under the Stockholders Agreement.  WCAS CP III hereby confirms and agrees to
be bound by all of the provisions of the Stockholders Agreement.

          SECTION 3.  APPLICABLE LAW.    This Amendment shall be governed by
and construed in accordance with the laws of the State of New York, without
regard to conflicts of law principles

<PAGE>



          SECTION 4.  ORIGINAL AGREEMENT.  Except as amended or modified
pursuant to this Amendment, the terms of the Stockholders Agreement shall
remain in full force and effect.

          SECTION 5.  SEVERABILITY.  The invalidity or unenforceability of
any provisions of this Amendment in any jurisdiction shall not affect the
validity, legality or enforceability of the remainder of this Amendment in
such jurisdiction or the validity, legality or enforceability of this
Amendment, including any such provision, in any other jurisdiction, it being
intended that all rights and obligations of the parties hereunder shall be
enforceable to the fullest extent permitted by law.

         SECTION 6.  COUNTERPARTS; EFFECTIVENESS.  This Amendment may be
executed in any number of counterparts, each of which shall be an original
with the same effect as if the signatures thereto and hereto were upon the
same instrument.

<PAGE>

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

                                   ALLIANCE DATA SYSTEMS CORPORATION


                                   By /s/ Edward K. Mims
                                      ---------------------------------------
                                      Title: EVP & CPO


                                   LIMITED COMMERCE CORP.


                                   By /s/ [Illegible]
                                      ---------------------------------------
                                      Title:


                                   WELSH, CARSON, ANDERSON & STOWE VIII, L.P.
                                   By: WCAS VIII Partners, L.P.,
                                       General Partner


                                   By /s/ Laura VanBuren
                                      ---------------------------------------
                                      Title: General Partner


                                   WELSH, CARSON, ANDERSON & STOWE VII, L.P.
                                   By: WCAS VII Partners, L.P.,
                                       General Partner


                                   By /s/ Laura VanBuren
                                      ---------------------------------------
                                      Title: General Partner


                                   WELSH, CARSON, ANDERSON & STOWE VI, L.P.
                                   By: WCAS VI Partners, L.P.,
                                       General Partner


                                   By /s/ Laura VanBuren
                                      ---------------------------------------
                                      Title: General Partner


                                       3


<PAGE>
                                       WCAS INFORMATION PARTNERS, L.P.
                                       By: WCAS INFO Partners,
                                         General Partner


                                       By /s/ Laura VanBuren
                                          ------------------------------
                                          Title:  General Partner
                                                  Attorney-in-fact


                                       WCAS CAPITAL PARTNERS II, L.P.
                                       By: WCAS CP II Partners,
                                         General Partner


                                       By /s/ Laura VanBuren
                                          ------------------------------
                                          Title:  General Partner


                                       WCAS CAPITAL PARTNERS III, L.P.
                                       By: WCAS CP III Partners,
                                         General Partner


                                       By /s/ Laura VanBuren
                                          ------------------------------
                                          Title:  General Partner

                                                        *
                                          ------------------------------
                                          Patrick J. Welsh

                                                        *
                                          ------------------------------
                                          Russell L. Carson

                                                        *
                                          ------------------------------
                                          Bruce K. Anderson


                                       4

<PAGE>


                                                      *
                                       ---------------------------------
                                       Richard H. Stowe


                                                      *
                                       ---------------------------------
                                       Andrew M. Paul


                                                      *
                                       ---------------------------------
                                       Thomas E. McInerney


                                       /s/ Laura VanBuren
                                       ---------------------------------
                                       Laura VanBuren


                                                      *
                                       ---------------------------------
                                       James B. Hoover


                                                      *
                                       ---------------------------------
                                       Robert A. Minicucci


                                                      *
                                       ---------------------------------
                                       Anthony J. deNicola


                                       /s/ David Bellet
                                       ---------------------------------
                                       David Bellet


                                                      *
                                       ---------------------------------
                                       Paul B. Queally


                                       5
<PAGE>



                                       /s/ Lawrence B. Sorrel
                                       ---------------------------------
                                       Lawrence Sorrel



                                       /s/ Priscilla Newman
                                       ---------------------------------
                                       Priscilla Newman


                                       /s/ Rudolph Rupert
                                       ---------------------------------
                                       Rudolph Rupert


                                       /s/ D. Scott Mackesy
                                       ---------------------------------
                                       D. Scott Mackesy


                                      *By: /s/ Laura VanBuren
                                           -----------------------------
                                           Laura VanBuren
                                           Attorney-in-fact


                                       6