Document:

<PAGE>   1
                                                                    Exhibit 4.2
                                                                 EXECUTION COPY

===============================================================================

                          QUALITY CARE SOLUTIONS, INC.

                  SERIES C PREFERRED STOCK PURCHASE AGREEMENT

                                  May 29, 1998

===============================================================================

<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<S>  <C>                                                                                                <C>
SECTION 1. Authorization and Sale of Series C Preferred Stock ........................................... 1

     1.1. Authorization of Series C Preferred Stock ..................................................... 1
     1.2. Sale of Series C Preferred Stock .............................................................. 1

SECTION 2. Closing Dates; Delivery ...................................................................... 1

     2.1. Closing Dates ................................................................................. 1
     2.2. Delivery and Payment .......................................................................... 2

SECTION 3. Representations and Warranties of the Company ................................................ 2

     3.1. Organization and Standing; Charter Documents .................................................. 2
     3.2. Corporate Power ............................................................................... 2
     3.3. Subsidiaries .................................................................................. 3
     3.4. Capitalization ................................................................................ 3
     3.5. Authorization ................................................................................. 3
     3.6. Proprietary Rights ............................................................................ 4
     3.7. Litigation, etc. .............................................................................. 5
     3.8. Material Liabilities .......................................................................... 5
     3.9. Material Agreements ........................................................................... 5
     3.10. Title to Properties and Assets; Liens, etc. .................................................. 5
     3.11. Compliance with Other Instruments, None Burdensome, etc. ..................................... 5
     3.12. Employees .................................................................................... 6
     3.13. Registration Rights .......................................................................... 6
     3.14. Governmental Consent, etc. ................................................................... 6
     3.15. Offering ..................................................................................... 6
     3.16. Brokers or Finders ........................................................................... 7
     3.17. Related-Party Transactions ................................................................... 7
     3.18. Permits ...................................................................................... 7
     3.19. Insurance .................................................................................... 7
     3.20. Financial Statements ......................................................................... 7
     3.21. Employee Benefit Plans ....................................................................... 8
     3.22. Tax Returns and Payments ..................................................................... 8
     3.23. Minute Books ................................................................................. 8
     3.24. Section 1202 of the Internal Revenue Code .................................................... 8
     3.25. Disclosure ................................................................................... 9

SECTION 4. Representations and Warranties of the Purchasers .............................................10

     4.1. Preexisting Relationship with Company; Business and Financial Experience ......................10
     4.2. Investment Intent; Blue Sky ...................................................................10
     4.3. Rule 144 ......................................................................................10
     4.4. No Public Market ..............................................................................10
     4.5. Restrictions on Transfer; Restrictive Legends .................................................10

</TABLE>

                                       i
<PAGE>   3
     4.6.  Authorization .................................................... 11
     4.7.  Tax Liability .................................................... 11

SECTION 5. Covenants ........................................................ 11

     5.1.  Annual Financial Statements ...................................... 11
     5.2.  Insurance ........................................................ 11
     5.3.  Board of Directors ............................................... 11

SECTION 6. Conditions to Closing of the Purchasers .......................... 11

     6.1.  Representations and Warranties Correct ........................... 11
     6.2.  Covenants ........................................................ 12
     6.3.  Opinion of the Company's Counsel ................................. 12
     6.4.  Blue Sky ......................................................... 12
     6.5.  Restated Certificates ............................................ 12
     6.6.  Legal Matters .................................................... 12
     6.7.  Shareholder Rights Agreement ..................................... 12
     6.8.  Compliance Certificate ........................................... 12
     6.9.  Board of Directors ............................................... 12
     6.10. Purchaser's Due Diligence ........................................ 12
     6.11. Employment, Confidential Information and Invention Assignment
           Agreements ....................................................... 12
     6.12. Management Rights Letter ......................................... 13

SECTION 7. Conditions to Closing of the Company ............................. 13

     7.1.  Representations and Warranties Correct ........................... 13
     7.2.  Covenants ........................................................ 13
     7.3.  Blue Sky ......................................................... 13
     7.4.  Restated Certificate ............................................. 13
     7.5.  Legal Matters .................................................... 13
     7.6.  Shareholder Rights Agreement ..................................... 13

SECTION 8. Miscellaneous .................................................... 13

     8.1.  Governing Law .................................................... 13
     8.2.  Entire Agreement; Amendment ...................................... 13
     8.3.  Notices, etc. .................................................... 14
     8.4.  Delays or Omissions .............................................. 15
     8.5.  Expenses ......................................................... 15
     8.6.  Counterparts ..................................................... 15
     8.7.  Severability ..................................................... 15
     8.8.  Titles and Subtitles ............................................. 15

                                       ii

<PAGE>   4
SCHEDULE I     Schedule of Purchasers
EXHIBIT A      Restated Series A and B Certificates of Designation and Series C
               Certificate of Designation
EXHIBIT B      Schedule of Exceptions
EXHIBIT C      Shareholder Rights Agreement
EXHIBIT D      Form of Employment, Confidential Information and Invention
               Assignment Agreement
EXHIBIT E      Form of Legal Opinion of Bryan Cave LLP
EXHIBIT F      Compliance Certificate
EXHIBIT G      Management Rights Letter

                                      iii

<PAGE>   5

                                                                  EXECUTION COPY

                          QUALITY CARE SOLUTIONS, INC.

                  SERIES C PREFERRED STOCK PURCHASE AGREEMENT

     This agreement (the "AGREEMENT") is made effective as of May 29, 1998, by
and among Quality Care Solutions, Inc., a Nevada corporation (the "COMPANY"),
and each of the purchasers (the "PURCHASERS") listed on the Schedule of
Purchasers attached hereto as Schedule I (the "SCHEDULE OF PURCHASERS").

                                   SECTION 1.

               AUTHORIZATION AND SALE OF SERIES C PREFERRED STOCK

     1.1  AUTHORIZATION OF SERIES C PREFERRED STOCK.  The Company has
authorized the sale and issuance of 5,194,805 shares (the "SHARES") of Series C
Preferred Stock (the "SERIES C PREFERRED"), having the rights, preferences,
privileges and restrictions as set forth in the certificate of designation in
substantially the form attached hereto as Exhibit A (the "SERIES C
CERTIFICATE").

     1.2  SALE OF SERIES C PREFERRED STOCK.  Subject to the terms and
conditions hereof, the Company will issue and sell to each of the Purchasers,
severally, and each Purchaser will severally buy from the Company the total
number of Shares specified opposite such Purchaser's name on the Schedule of
Purchasers, at a per share purchase price of $0.77 (the "PER SHARE PRICE"), and
at the aggregate purchase price set forth opposite such Purchaser's name on the
Schedule of Purchasers. The Company's agreements with each of the Purchasers are
separate agreements, and the sales of the Series C Preferred to each of the
Purchasers are separate sales.

                                   SECTION 2.

                            CLOSING DATES; DELIVERY

     2.1  CLOSING DATES.  It is anticipated that purchases and sales of the
Shares hereunder shall be consummated at one or two closings (collectively, the
"CLOSINGS" or individually, a "CLOSING"). Each Closing will be held at the
offices of Wilson Sonsini Goodrich & Rosati, 650 Page Mill Road, Palo Alto, CA
at 10:00 a.m. (Pacific Time), or at such other time and place upon which the
Company and the Purchasers consummating purchases at such Closing shall agree.
The first such Closing (the "FIRST CLOSING") shall take place on May 29, 1998
or such other date upon which the Company and the Purchasers participating in
the First Closing shall agree (the date and time of the First Closing is
hereinafter referred to as the "FIRST CLOSING DATE"). The Company may hold one
subsequent Closing (the "SECOND CLOSING") which will occur not later than 30
days after the First Closing Date. The Per Share Price and other terms of sales
consummated at the Second Closing shall be substantially identical to the terms
of the sale consummated at the First Closing. The Schedule of Purchasers shall
be amended in connection with the Second Closing to add thereto information
relating to the Purchasers participating in such Closing and Section 1.1 shall
be amended to increase the aggregate number of shares of
<PAGE>   6
Series C Preferred to be sold under this Agreement, such aggregate number not
to exceed 7,241,073. Such increased number of Shares shall be authorized in an
amendment to the Series C Certificate which has been duly adopted by the Board
of Directors and approved by the required vote of the stockholders. Each
Purchaser whose sales are consummated at the First Closing agrees to approve
such an amendment to the Series C Certificate provided that (i) the Second
Closing occurs within 30 days of the First Closing, (ii) the aggregate number
of shares of Series C Preferred authorized for issuance does not exceed
7,241,073 and (iii) only current holders of Series A Preferred Stock and Series
B Preferred Stock purchase shares at the Second Closing.

     2.2 DELIVERY AND PAYMENT. At each Closing, the Company will deliver to
each Purchaser with respect to the Shares being purchased at such Closing, a
certificate or certificates, registered in such Purchaser's name as set forth
on the Schedule of Purchasers, representing the number of Shares to be
purchased by such Purchaser at such Closing, against payment of the purchase
price therefor, by check payable to the Company, or by wire transfer per the
Company's instructions.

                                   SECTION 3.

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
                 ---------------------------------------------

     Except as set forth on Exhibit B attached hereto or, with respect to the
Second Closing, in the supplemental disclosure letter delivered by the Company
to the Purchasers participating in the Second Closing prior to the Second
Closing, the Company represents and warrants to each Purchaser that, as of date
of the Closing at which such Purchaser consummates its purchase of Shares
hereunder:

     3.1 ORGANIZATION AND STANDING; CHARTER DOCUMENTS. The Company is a
corporation duly organized and existing under, and by virtue of, the laws of
the State of Nevada and is in good standing under such laws. The Company has
requisite corporate power and authority to own and operate its properties and
assets, and to carry on its business as presently conducted and as proposed to
be conducted. The Company is presently qualified to do business as a foreign
corporation in Arizona and there is no other jurisdiction in which the failure
to be so qualified would have a material adverse effect on the business or
financial condition of the Company. The Company has furnished the counsel for
the Purchasers with copies of its Articles of Incorporation (the "ARTICLES"),
amended and restated certificates of designation for each of the Series A
Preferred Stock and Series B Preferred Stock (the "RESTATED CERTIFICATES OF
DESIGNATION"), Series C Certificate and Bylaws (collectively, the "CHARTER
DOCUMENTS"). Said copies are true, correct and complete and reflect all
amendments now in effect.

     3.2 CORPORATE POWER. The Company has all requisite legal and corporate
power and authority to execute and deliver this Agreement and the Shareholder
Rights Agreement in substantially the form attached hereto as Exhibit C (the
"SHAREHOLDER RIGHTS AGREEMENT"), to sell and issue the Shares hereunder, to
issue the underlying Common Stock (the "CONVERSION STOCK") in accordance with
the provisions of the Charter Documents, and to carry out and

                                       2
<PAGE>   7
perform its obligations under the terms of this Agreement and the Shareholder
Rights Agreement.

     3.3  SUBSIDIARIES. The Company has no subsidiaries or affiliated companies
and does not otherwise own or control, directly or indirectly, any equity
interest in any corporation, association or business entity.

     3.4  CAPITALIZATION. The authorized capital stock of the Company will, upon
the filing of the Restated Certificates of Designation and the Series C
Certificate, consist of 100,000,000 shares of Common Stock and 10,000,000 shares
of Preferred Stock, of which 2,861,382 have been designated Series A Preferred
Stock ("SERIES A PREFERRED"), 160,000 have been designated as Series B Preferred
Stock ("SERIES B PREFERRED") and 5,194,805 have been designated as Series C
Preferred Stock. Immediately prior to the Closing, the total number of
outstanding shares of Common Stock was 9,123,713. Upon the filing of the
Restated Certificates of Designation and the Series C Certificate and
immediately prior to the Closing, the total number of outstanding shares of
Series A Preferred Stock was 2,861,382 and the total number of outstanding
shares of Series B Preferred Stock was 160,000. The Series A Preferred Stock and
the Series B Preferred Stock shall have the rights, preferences, privileges and
restrictions set forth in each of their respective Restated Certificates of
Designation. The Series C Preferred Stock shall have the rights, preferences,
privileges and restrictions set forth in the Series C Certificate. All currently
outstanding shares of Common Stock, Series A Preferred Stock and Series B
Preferred Stock have been duly authorized and validly issued, are fully paid and
nonassessable, and have been issued in compliance with state and federal
applicable securities laws, and a true complete list of all holders of such
shares is set forth on Exhibit B. The Company has reserved 5,194,805 shares of
Series C Preferred for issuance hereunder, 5,194,805 shares of Common Stock for
issuance upon conversion of the Series C, 160,000 shares of Common Stock for
issuance upon conversion of the Series B Preferred and 2,861,382 shares of
Common Stock for issuance upon conversion of the Series A Preferred. Of the
2,500,000 shares of Common Stock of the Company reserved for issuance under the
Company's stock option plans, 123,664 shares have been issued pursuant to the
exercise of options granted with respect thereto, 2,020,668 shares remain
subject to outstanding options, and 355,668 shares remain available to underlie
future option grants. In addition, as of the Closing, there are outstanding
warrants to purchase an aggregate of 412,142 shares of the Company's Common
Stock. All of the granted options and warrants have been duly authorized,
validly issued and have been issued in compliance with applicable state and
federal securities laws and a true and complete list of all grantees of such
options and warrants is set forth on Exhibit B. Except as set forth above and as
provided in the Company's Charter Documents, there are no options, warrants or
other rights to purchase or acquire any of the Company's authorized and unissued
capital stock. The Company is not a party or subject to any agreement or
understanding, and to the best of the knowledge of the Company, there is no
agreement or understanding between any persons and/or entities, which affects or
relates to the voting or giving of written consents with respect to any security
or the voting by a director of the Company.

     3.5  AUTHORIZATION. All corporate action on the part of the Company, its
directors and stockholders necessary for the authorization, execution, delivery
and performance of this

                                       3
<PAGE>   8
Agreement and the Shareholder Rights Agreement by the Company, the
authorization, sale, issuance and delivery of the Shares and the Conversion
Stock and the performance of all of the Company's obligations hereunder and
under the Shareholder Rights Agreement has been taken or will be taken prior to
the First Closing. This Agreement and the Shareholder Rights Agreement, when
executed and delivered by the Company, shall constitute valid and binding
obligations of the Company, enforceable in accordance with their terms, subject
to laws of general application relating to bankruptcy, insolvency and the
relief of debtors and rules of law governing specific performance, injunctive
relief or other equitable remedies; provided, however, that the Company makes
no representation as to the enforceability of the indemnification provisions
contained in the Shareholder Rights Agreement. The Shares, when issued in
compliance with the provisions of this Agreement, will be validly issued, fully
paid and nonassessable, and will have the rights, preferences, privileges and
restrictions described in the Series C Certificate; the Common Stock issuable
upon conversion of the Shares has been duly and validly reserved and, when
issued in compliance with the provisions of the Articles and the Series C
Certificate, will be validly issued, fully paid and nonassessable; and the
Shares and the Conversion Stock will be free of any liens or encumbrances
(assuming the Purchasers take the Shares with no notice thereof) other than any
liens or encumbrances created by or imposed upon the holders; provided,
however, that the Shares and the Conversion Stock may be subject to
restrictions on transfer under state or federal securities laws and
restrictions set forth in the Shareholder Rights Agreement. The issuance of the
Shares is not subject to any preemptive rights or rights of first refusal,
except for the rights of the Series A and Series B set forth in each of their
Restated Certificates of Designation.

     3.6  PROPRIETARY RIGHTS. The Company has title and ownership of all
patents, trademarks, service marks, trade names, copyrights, trade secrets,
information, proprietary rights and processes used in or necessary for its
business as now conducted and as proposed to be conducted without any conflict
with or infringement of the rights of others. There are no outstanding options,
licenses, or agreements of any kind relating to the foregoing, nor is the
Company bound by or a party to any options, licenses or agreements of any kind
with respect to the patents, trademarks, service marks, trade names, copyrights,
trade secrets, licenses, information, proprietary rights and processes of any
other person or entity. The Company has not violated nor, by conducting its
business as proposed, would violate any of the patents, trademarks, service
marks, trade names, copyrights or trade proprietary rights of any other person
or entity. To the best knowledge of the Company after due and diligent
investigation, none of its employees is obligated under any contract (including
licenses, covenants or commitments of any nature) or other agreement, or subject
to any judgment, decree or order of any court or administrative agency, that
would interfere with the use of his or her best efforts to promote the interests
of the Company or that would conflict with the Company's business as proposed to
be conducted. Neither the execution nor delivery of this Agreement or the
Shareholder Rights Agreement, nor the carrying on of the Company's business by
the employees of the Company, nor the conduct of the Company's business as
proposed, will, to the best of the Company's knowledge after due and diligent
investigation, conflict with or result in a breach of the terms, conditions or
provisions of, or constitute a default under, any contract, covenant or
instrument under which any of such employees is now obligated. The Company does
not believe it is or will

                                       4
<PAGE>   9
be necessary to utilize any inventions of any of its employees (or people it
currently intends to hire) made prior to their employment by the Company.

     3.7  LITIGATION, ETC. There are no actions, suits, proceedings or
investigations pending or, to the Company's knowledge, threatened against the
Company or its properties before any court or governmental agency. The
foregoing includes, without limitation, actions pending or threatened (or any
basis therefor known to the Company) involving the prior employment of any of
the Company's employees, their use in connection with the Company's business of
any information or techniques allegedly proprietary to any of their former
employers, or their obligations under any agreements with prior employers. The
Company is not a party or subject to the provisions of any order, writ,
injunction, judgment or decree of any court or government agency or
instrumentality. There is no action, suit, proceeding or investigation by the
Company currently pending or which the Company intends to initiate.

     3.8  MATERIAL LIABILITIES. Except as set forth in the Financial Statements
(as defined in Section 3.20), the Company has no liabilities or obligations,
absolute or contingent, which are reasonably expected to exceed $25,000
individually or in the aggregate.

     3.9  MATERIAL AGREEMENTS. All of the contracts and agreements with
expected receipts or expenditures in excess of $25,000 or involving a license
or grant of rights to or from the Company involving patents, copyrights,
trademarks, or other proprietary information applicable to the business of the
Company, to which the Company is a party and which are in effect as of the
First Closing Date are listed on Exhibit B. All such contracts and agreements
are valid, binding and in full force and effect in all material respects,
subject to laws of general application relating to bankruptcy, insolvency and
the relief of debtors and rules of law governing specific performance,
injunctive relief or other equitable remedies, and the Company has not received
any indication of an intention to terminate any such contract or agreement by
any of the parties to any such contract or agreement.

     3.10 TITLE TO PROPERTIES AND ASSETS; LIENS, ETC. The Company has good and
marketable title to its properties and assets, and has good title to all its
leasehold interests, in each case subject to no mortgage, pledge, lien,
encumbrance or charge, other than (i) the lien of current taxes not yet due and
payable, and (ii) possible minor liens and encumbrances which, when considered
individually or together, do not materially detract from the value of the
property subject thereto or materially impair the operations of the Company, and
which have not arisen otherwise than in the ordinary course of business and such
properties and assets are sufficient to enable the Company to carry on its
business as presently conducted and, to the Company's knowledge, as proposed to
be conducted.

     3.11 COMPLIANCE WITH OTHER INSTRUMENTS, NONE BURDENSOME, ETC. The Company
is not in violation of or default under: (i) any term of its Charter Documents,
as amended to date; (ii) in any material respect, any term or provision of any
mortgage, indebtedness, indenture, contract, agreement, instrument, judgment or
decree; and (iii) any order, statute, rule or regulation applicable to the
Company. The execution, delivery and performance of and compliance with this
Agreement, and the issuance of the Shares and the Conversion Stock, have

                                       5

<PAGE>   10
not resulted and will not result in any violation of, or conflict with, or
constitute a default under, the Company's Charter Documents, as amended to date
and have not and will not result in any violation of, or conflict with, or
constitute a default under, any of its agreements nor result in the creation of
any mortgage, pledge, lien, encumbrance or charge upon any of the properties or
assets of the Company.

     3.12  EMPLOYEES.  No employee of the Company has any agreement or
contract, written or oral, except as set forth herein, regarding such person's
employment with the Company. To the best of the Company's knowledge after due
and diligent investigation, no employee of the Company nor any consultant with
whom the Company has contracted is in violation of any term of any employment
contract, non-disclosure agreement or any other similar contract or agreement
relating to the relationship of such employee or consultant with the Company,
any former employer or any other party. No employee of the Company has been
granted the right to continued employment by the Company or to any material
compensation following termination of employment with the Company. The Company
is not aware that any officer or key employee, or that any group of officers
and/or key employees, intends to terminate their employment with the Company,
nor does the Company have a present intention to terminate the employment of
any officer, key employee or group of officers and/or key employees. Each prior
and current officer, employee and consultant of the Company has executed an
Employment, Confidential Information and Invention Assignment Agreement
substantially in the form attached hereto as Exhibit D. No current officer,
employee or consultant of the Company has excluded works or inventions made
prior to his or her employment with the Company from his or her assignment of
inventions pursuant to such Employment Confidential Information and Invention
Assignment Agreement.

     3.13  REGISTRATION RIGHTS.  Except as set forth in (i) the Shareholder
Rights Agreement and (ii) certain outstanding warrants held by Peacock, Hislop,
Staley & Given, Inc. to purchase an aggregate of 312,142 shares of Common Stock
of the Company, the Company immediately prior to the First Closing will not be
under any contractual obligation to register under the Securities Act of 1933,
as amended (the "SECURITIES ACT"), any of its presently outstanding securities
or any of its securities which may hereafter be issued.

     3.14  GOVERNMENTAL CONSENT, ETC.  No consent, approval or authorization of
or designation, declaration or filing with any governmental authority on the
part of the Company is required in connection with the valid execution and
delivery of this Agreement, or the offer, sale or issuance of the Shares or the
Conversion Stock, or the consummation of any other transaction contemplated
hereby, except (a) the filing of the Restated Certificates of Designation and
the Series C Certificate in the office of the Nevada Secretary of State prior to
the Closing and (b) the qualification (or taking of such action as may be
necessary to secure an exemption from qualification, if available) of the offer
and sale of the Shares and the Conversion Stock under applicable Blue Sky laws,
which filings and qualifications, if required, will be accomplished in a timely
manner.

     3.15  OFFERING.  Subject to the accuracy of the Purchasers'
representations in Section 4 hereof, the offer, sale and issuance of the Shares
and the Conversion Stock constitute transactions

                                       6

<PAGE>   11
exempt from the registration requirements of Section 5 of the Securities Act.
Neither the Securities and Exchange Commission not any state securities
commission has issued any order preventing or suspending the offer, sale and
issuance of the Shares and the Conversion Stock, or, to the best knowledge of
the Company, contemplated instituting proceedings for that purpose.

     3.16 BROKERS OR FINDERS. Neither the Company nor the Purchaser, as a result
of any action taken by the Company, have incurred or will incur, directly or
indirectly, any liability for brokerage or finders' fees or agents' commissions
or any similar charges in connection with this Agreement or the transactions
contemplated hereby.

     3.17 RELATED-PARTY TRANSACTIONS. No employee, officer, or director of the
Company or member of such person's immediate family is indebted to the Company,
nor is the Company indebted (or committed to make loans or extend or guarantee
credit) to any of them except as disclosed in Exhibit B. To the best of the
Company's knowledge, none of such persons has any direct or indirect ownership
interest in any firm or corporation with which the Company is affiliated or
with which the Company has a business relationship, or any firm or corporation
that competes with the Company, except that employees, officers, or directors
of the Company and members of their immediate families may own less than 1% of
the outstanding stock in a publicly traded company that may compete with the
Company. No employee, officer or director of the Company or member of such
person's immediate family is directly or indirectly interested in any contract
with the Company.

     3.18 PERMITS. The Company has all franchises, permits, licenses, and any
similar authority necessary for the conduct of its business as now being
conducted or proposed to be conducted by it, the lack of which could materially
and adversely affect the business, properties, prospects, or financial
condition of the Company, and the Company believes it can obtain, without undue
burden or expense, any similar authority for the conduct of its business as
planned to be conducted. The Company is not in default in any material respect
under any of such franchises, permits, licenses, or other similar authority.

     3.19 INSURANCE. The Company has insurance policies in effect covering the
risks associated with its business and properties which are of such character
and in such amounts as are customarily maintained by entities engaged in the
same or similar business and similarly situated. The Company has obtained, or
prior to Closing will obtain, a life insurance policy on J. Mikel Echeverria
with a face amount of $500,000, with proceeds payable to the Company.

     3.20 FINANCIAL STATEMENTS. The Company has delivered to the Purchasers an
audited balance sheet and profit and loss statement as of and for the annual
period ended December 31, 1997 (the "ANNUAL FINANCIAL STATEMENTS") and
unaudited balance sheet and profit and loss statement as of and for the three
month period ended March 31, 1998 (collectively, the "FINANCIAL STATEMENTS").
The Financial Statements have been complied on a consistent basis throughout
the period indicated and with each other. The Financial Statements fairly
present the financial condition and operating results of the Company as of the
dates, and for the periods, indicated therein, subject to normal year-end audit
adjustments. Except as set forth in the Financial Statements, the Company has
no liabilities, contingent or otherwise, other than (i)

                                       7
<PAGE>   12
liabilities incurred in the ordinary course of business subsequent to March 31,
1998 and (ii) obligations under contracts and commitments incurred in the
ordinary course of business and not required under generally accepted accounting
principles to be reflected in the Financial Statements, which, in both cases,
individually or in the aggregate or not material to the financial condition or
operating results of the Company. The Company hereby represents and warrants
that the Annual Financial Statements have been, and all yearly financial
statements thereafter shall be, audited by an independent certified public
accounting firm of national recognition and such financial statements shall be
prepared in accordance with generally accepted accounting principles.

     3.21 EMPLOYEE BENEFIT PLANS. The Company does not have any Employee
Benefit Plans as defined in the Employee Retirement Income Security Act of 1974.

     3.22 TAX RETURNS AND PAYMENTS. The Company has filed all tax returns and
reports as required by law. These returns and reports are true and correct in
all material respects. The Company has paid all taxes and other assessments due.

     3.23 MINUTE BOOKS. The copy of the minute books of the Company provided to
the counsel for the Purchasers contains minutes of all meetings of directors
and shareholders and all actions by written consent without a meeting by the
directors and shareholders since the date of incorporation and reflects all
actions by the directors (and any committee of directors) and shareholders with
respect to all transactions referred to in such minutes accurately in all
material respects.

     3.24 SECTION 1202 OF THE INTERNAL REVENUE CODE. The capital stock issuable
hereunder will constitute "Qualified Small Business Stock" within the meaning
of Section 1202 of the Internal Revenue Code of 1986, as amended (the "CODE"),
as of the date of issuance and the Company hereby represents, warrants and
covenants that it shall continue to do the following:

          (a) use its reasonable best efforts to cause the Shares to continue
to constitute Qualified Small Business Stock, including without limitation,
compliance with the reporting and record keeping requirements of Section 1202
of the Code and any regulations promulgated thereunder; and

          (b) without limiting the generality of the foregoing, use its
reasonable efforts to provide the Purchasers with notice at least thirty (30)
business days prior to taking any of the following actions:

               (i) Within the two-year period ending one year from the date
hereof, purchase an amount of its own stock (within the meaning of Section
1202(c)(3) of the Code) having an aggregate value at the time(s) of purchase
exceeding five percent of the aggregate value of all of its outstanding stock
determined as of the start of such period;

               (ii) Conduct any of the following businesses (as defined for
purposes of Section 1202(e)(3) of the Code:

                                       8
<PAGE>   13
               (A)  any business involving the performance of service in the
fields of law, accounting, actuarial science, performing arts, athletics or
brokerage services;

               (B)  any banking or insurance business;

               (C)  any farming business (including the business of raising or
harvesting trees);

               (D)  any business involving the production of extraction of
natural resources with respect to which a deduction is allowable under Section
613 or 613A of the Code;

               (E)  any business of operating a hotel, motel, restaurant or
similar establishment;

          (iii) Permit more than 10% of the value of its assets to consist of
stock issued by other companies (other than stock of companies that qualify as
subsidiaries of the Company within the meaning of Section 1202(e)(5) of the Code
or stock that is held as working capital or reasonably expected to be sold
within two years to finance research and experimentation within the meaning of
Section 1202(e)(6) of the Code;

          (iv)  Permit more than 10% of the value of its assets to consist of
real property which is not used in the active conduct of a qualified trade or
business within the meaning of Section 1202(e)(7) of the Code;

          (v)   Make an election under section 936 of the Code (relating to the
Puerto Rico and possessions tax credit) or permit a subsidiary to make such an
election; or

          (vi)  In a single transaction or series of related transactions, raise
capital or more than $1 million through the issuance of securities or the
incurrence of indebtedness if such transaction or series of related transactions
likely would cause the Company to fail to satisfy the active business
requirement set forth in Section 1202(e)(1) of the Code by virtue of holding
excess cash or investment assets.

     For purposes of the foregoing, any valuation of other determination
(including, without limitation, a determination that a specific course of
action does not constitute the conduct of a business described in 2(b), above)
made by the Company's Board of Directors in good faith or for which there was,
at the time made, a reasonable basis in law or fact shall be conclusive.

     3.25  DISCLOSURE.  No representation or warranty made by the Company in
this Agreement, any schedule or exhibit hereto, or any certificate delivered
hereunder or any other statement or document delivered to the Purchasers by or
on behalf of the Company contains any untrue statement of a material fact,  or
omits to state a material fact necessary to make the

                                       9

<PAGE>   14
statements contained herein or therein not misleading in light of the
circumstances under which they were made.

                                   SECTION 4.

                REPRESENTATIONS AND WARRANTIES OF THE PURCHASERS

     Each Purchaser hereby severally represents and warrants to the Company as
follows:

     4.1 PREEXISTING RELATIONSHIP WITH COMPANY; BUSINESS AND FINANCIAL
EXPERIENCE. It either (i) has a prior business and/or personal relationship with
the Company and/or its officers and directors, or (ii) by reason of its business
or financial experience or the business or financial experience of its
professional advisors who are unaffiliated with the Company, and who are not
compensated by the Company, it has the capacity to protect its own interests in
connection with the purchase of the Shares and underlying Conversion Stock.

     4.2 INVESTMENT INTENT; BLUE SKY. It is acquiring the Shares and the
underlying Conversion Stock for investment for its own account, not as a nominee
or agent, and not with the view to, or for resale in connection with, any
distribution thereof. It understands that the issuance of the Shares and the
underlying Conversion Stock has not been, and will not be, registered under the
Securities Act by reason of a specific exemption from the registration
provisions of the Securities Act, the availability of which depends upon, among
other things, the bona fide nature of the Purchaser's investment intent and the
accuracy of the Purchaser's representations as expressed herein. The Purchaser's
address set forth on Schedule I represents the Purchaser's true and correct
state of domicile, upon which the Company may rely for the purpose of complying
with the applicable "Blue Sky" laws.

     4.3 RULE 144. It acknowledges that the Shares and the underlying Conversion
Stock must be held indefinitely unless subsequently registered under the
Securities Act or unless an exemption from such registration is available. It is
aware of the provisions of Rule 144 promulgated under the Securities Act which
permit limited resale of shares purchased in a private placement subject to the
satisfaction of certain conditions, including, among other things, the existence
of a public market for the shares, the availability of certain current public
information about the Company, the resale occurring not less than one year after
a party has purchased and paid for the security to be sold, the sale being
effected through a "broker's transaction" or in a transaction directly with a
"market maker," and the number of shares being sold during any three-month
period not exceeding specified limitations.

     4.4 NO PUBLIC MARKET. It understands that no public market now exists for
any of the securities issued by the Company and that the Company has made no
assurances that a public market will ever exist for the Company's securities.

     4.5 RESTRICTIONS ON TRANSFER; RESTRICTIVE LEGENDS. It understands that the
transfer of the Shares and the Conversion Stock is restricted by applicable
state and Federal securities laws, and that the certificates representing the
Shares and the Conversion Stock will be imprinted with legends restricting
transfer except in compliance therewith.

                                       10

<PAGE>   15
     4.6  AUTHORIZATION. All action on the part of the Purchaser's partners,
board of directors, and stockholders, as applicable, necessary for the
authorization, execution, delivery and performance of this Agreement and the
Shareholder Rights Agreement by the Purchaser, the purchase of and payment for
the Shares and the Conversion Stock and the performance of all of the
Purchaser's obligations hereunder and under the Shareholder Rights Agreement has
been taken or will be taken prior to the Closing. This Agreement and the
Shareholder Rights Agreement, when executed and delivered by the Purchaser,
shall constitute valid and binding obligations of the Purchaser, enforceable in
accordance with their terms, subject to laws of general application relating to
bankruptcy, insolvency and the relief of debtors and rules of law governing
specific performance, injunctive relief or other equitable remedies; provided,
however, that the Purchaser makes no representation as to the enforceability of
the indemnification provisions contained in the Shareholder Rights Agreement.

     4.7  TAX LIABILITY. It has reviewed with its own tax advisors the tax
consequences of the transactions contemplated by this Agreement. It relies
solely on such advisors and not on any statements or representations of the
Company or any of the Company's agents with respect to such tax consequences.
It understands that it, and not the Company, shall be responsible for its own
tax liability that may arise as a result of the transactions contemplated by
this Agreement.

                                   SECTION 5.

                                   COVENANTS

     5.1  ANNUAL FINANCIAL STATEMENTS. Immediately after the First Closing, the
Company shall deliver to the Purchasers the Annual Financial Statements.

     5.2  INSURANCE. The Company will obtain within 30 days after the First
Closing Date a life insurance policy on J. Mikel Echeverria with a face amount
of $1,000,000, with proceeds payable to the Company.

     5.3  BOARD OF DIRECTORS. With 60 days after Closing, the Company's Board of
Directors shall appoint an outside director with industry experience who is
acceptable to all directors.

                                   SECTION 6.

                    CONDITIONS TO CLOSING OF THE PURCHASERS

     Each Purchaser's obligation to purchase the Shares is, unless waived in
writing by the Purchaser, subject to the fulfillment as of the date of such
Closing of the following conditions:

     6.1  REPRESENTATIONS AND WARRANTIES CORRECT. The representations and
warranties made by the Company in Section 3 hereof shall be true and correct in
all material respects as of the date of the Closing at which the Purchaser
consummates its purchase of Shares hereunder.

                                       11
<PAGE>   16
     6.2  COVENANTS.  All covenants, agreements and conditions contained in
this Agreement to be performed or complied with by the Company on or prior to
the First Closing Date shall have been performed or complied with in all
material respects.

     6.3  OPINION OF THE COMPANY'S COUNSEL.  The Purchaser shall have received
from Bryan Cave LLP, counsel to the Company, an opinion addressed to the
Purchaser, dated as of the date of the Closing at which the Purchaser
consummates its purchase of Shares hereunder, in substantially the form of
Exhibit E.

     6.4  BLUE SKY.  The Company shall have obtained all necessary Blue Sky law
permits and qualifications, or have the availability of exemptions therefrom,
required by any state for the offer and sale of the Shares and the underlying
Conversion Stock.

     6.5  RESTATED CERTIFICATES.  The Restated Certificates of Designation and
the Series C Certificate shall have been filed in the office of the Nevada
Secretary of State.

     6.6  LEGAL MATTERS.  All material matters of a legal nature which pertain
to this Agreement and the transactions contemplated hereby shall have been
reasonably approved by counsel to the Purchasers.

     6.7  SHAREHOLDER RIGHTS AGREEMENT.  The Shareholder Rights Agreement shall
have been executed and delivered by the parties thereto in substantially the
form attached hereto as Exhibit C.

     6.8  COMPLIANCE CERTIFICATE.  The Company shall have delivered to the
Purchasers a certificate of the Company in substantially the form attached
hereto as Exhibit F, executed by the President of the Company, dated as of the
date of the Closing at which the Purchaser consummates its purchase of Shares
hereunder, and certifying, among other things, to the fulfillment of the
conditions specified in Sections 6.1 and 6.2 of this Agreement.

     6.9  BOARD OF DIRECTORS.  Upon the Closing, the members of the Company's
Board of Directors shall be J. Mikel Echeverria and Gregory S. Anderson (who
shall fill the two board seats nominated by Management), Kent Mueller (who shall
be the Series A designee) Brian Smith (who shall be the Series C designee) and
one open seat which shall be filled in accordance with Section 5.3 of this
Agreement.

     6.10 PURCHASER'S DUE DILIGENCE.  Each Purchaser shall have satisfied
itself as to its due diligence investigation of the Company. Without
limitation, (i) each Purchaser shall have received annual financial statements
as of December 31, 1997 together with a draft audit report by an independent
national accounting firm and (ii) if applicable, each Purchaser shall have
received the approval of its investment committee or similar body.

     6.11 EMPLOYMENT, CONFIDENTIAL INFORMATION AND INVENTION ASSIGNMENT
AGREEMENTS.  Each officer, employee and consultant of the Company shall have
executed an Employment, Confidential Information and Invention Assignment
Agreement substantially in the form attached hereto as Exhibit D.

                                       12
<PAGE>   17
     6.12 MANAGEMENT RIGHTS LETTER. The Company shall have executed and
delivered to the Purchasers consummating sales at the First Closing a management
rights letter in substantially the form attached hereto as Exhibit G.

                                   SECTION 7.

                      CONDITIONS TO CLOSING OF THE COMPANY

     The Company's obligation to sell and issue the Shares at each Closing is,
unless waived in writing by the Company, subject to the fulfillment as of the
date of the Closing of the following conditions:

     7.1 REPRESENTATIONS AND WARRANTIES CORRECT. The representations made in
Section 4 hereof by the Purchasers purchasing at such Closing shall be true and
correct as of the date of such Closing.

     7.2 COVENANTS. All covenants, agreements, and conditions contained in this
Agreement to be performed or complied with by the Purchasers on or prior to the
date of such Closing shall have been performed or complied with in all material
respects.

     7.3 BLUE SKY. The Company shall have obtained all necessary Blue Sky law
permits and qualifications, or have the availability of exemptions therefrom,
required by any state for the offer and sale of the Shares and the underlying
Conversion Stock.

     7.4 RESTATED CERTIFICATE. The Restated Certificates of Designation and the
Series C Certificate shall have been filed in the office of the Nevada
Secretary of State.

     7.5 LEGAL MATTERS. All material matters of a legal nature which pertain to
this Agreement and the transactions contemplated hereby shall have been
reasonably approved by counsel to the Company.

     7.6 SHAREHOLDER RIGHTS AGREEMENT. Each of the Purchasers shall have
executed and delivered the Shareholder Rights Agreement in substantially the
form attached hereto as Exhibit C.

                                   SECTION 8.

                                 MISCELLANEOUS

     8.1 GOVERNING LAW. This Agreement shall be governed in all respects by the
internal laws of the State of Nevada without regard to conflict of laws
provisions.

     8.2 ENTIRE AGREEMENT; AMENDMENT. This Agreement, including the exhibits
hereto, constitutes the full and entire understanding and agreement among the
parties with regard to the subjects hereof and thereof, and no party shall be
liable or bound to any other party in any manner by any warranties,
representations or covenants except as specifically set forth herein or
therein. Except as expressly provided herein, neither this Agreement nor any
term hereof may be

                                       13

<PAGE>   18
amended, waived, discharged or terminated other than by a written instrument
signed by the party against whom enforcement of any such amendment, waiver,
discharge or termination is sought or, in the case of the Purchasers, by the
holders of a majority of the Shares purchased hereunder. Notwithstanding the
foregoing, the Company, acting alone, may amend (i) the Schedule of Purchasers
in connection with the Second Closing as provided in Section 2.1 and/or (ii)
Section 1.1 to increase the aggregate number of shares of Series C Preferred to
be sold under this Agreement, provided that such increased number of Shares has
been authorized in an amendment to the Series C Certificate which has been duly
adopted by the Board of Directors and approved by the required vote of the
stockholders; provided, however, that no such amendment shall have the effect of
increasing the number of Shares which any Purchaser is obligated to purchase
without such Purchaser's consent.

     8.3  NOTICES, ETC. All notices and other communications required or
permitted hereunder shall be in writing and shall be mailed by registered or
certified mail, postage prepaid, or otherwise delivered by facsimile
transmission, by hand or by messenger, addressed:

          (a)  if to a Purchaser, at such Purchaser's address as set forth in
Schedule I or at such other address as such Purchaser shall have furnished to
the Company, with a copy to:

               Wilson Sonsini Goodrich & Rosati, PC
               650 Page Mill Road
               Palo Alto, California 94303-1050
               Attn: Christopher G. Nicholson, Esq.
               Fax: (650) 493-6811

          (b)  if to the Company, to:

               Quality Care Solutions, Inc.
               5030 East Sunrise Drive
               Phoenix, Arizona 85044
               Attn: Gregory S. Anderson
               Fax: (602) 940-1388

or at such other address as the Company shall have furnished to the Purchaser,
with a copy to:

               Bryan Cave LLP
               2800 North Central Avenue, 21st Floor
               Phoenix, Arizona 85004-1098
               Attn: Joseph P. Richardson, Esq.
               Fax: (602) 266-5938

          Each such notice or other communication shall for all purposes of
this Agreement be treated as effective or having been given when received if
delivered personally, if sent by facsimile, the first business day after the
date of confirmation that the facsimile has been successfully transmitted to
the facsimile number for the party notified, or, if sent by mail, at the

                                       14
<PAGE>   19
earlier of its receipt or 72 hours after the same has been deposited in a
regularly maintained receptacle for the deposit of the United States mail,
addressed and mailed as aforesaid.

     8.4  DELAYS OR OMISSIONS. Except as expressly provided herein, no delay or
omission to exercise any right, power or remedy accruing to any party, upon any
breach or default of another party under this Agreement, shall impair any such
right, power or remedy of such party nor shall it be construed to be a waiver of
any such breach or default, or an acquiescence therein, or of or in any similar
breach or default thereafter occurring; nor shall any waiver of any single
breach or default be deemed a waiver of any other breach or default theretofore
or thereafter occurring. Any waiver, permit, consent or approval of any kind or
character on the part of any party of any breach or default under this
Agreement, or any waiver on the part of any party of any provisions or
conditions of this Agreement, must be in writing and shall be effective only to
the extent specifically set forth in such writing. All remedies, either under
this Agreement or by law or otherwise afforded to any party, shall be cumulative
and not alternative.

     8.5  EXPENSES. The Company shall bear its own expenses incurred on its
behalf with respect to this Agreement and the transactions contemplated hereby
and will pay the reasonable out-of-pocket expenses of the Purchasers, including
legal fees and expenses of Wilson Sonsini Goodrich & Rosati, P.C., as counsel to
the Purchasers.

     8.6  COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be an original, and all of which together
shall constitute one instrument.

     8.7  SEVERABILITY. In the event that any provision of this Agreement
becomes or is declared by a court of competent jurisdiction to be illegal,
unenforceable or void, this Agreement shall continue in full force and effect
without said provision, which shall be replaced with an enforceable provision
closest in intent and economic effect as the severed provision; provided that no
such severability shall be effective if it materially changes the economic
benefit of this Agreement to any party.

     8.8  TITLES AND SUBTITLES. The titles and subtitles used in this Agreement
are used for convenience only and are not to be considered in construing or
interpreting this Agreement.

                                       15
<PAGE>   20
     The foregoing agreement is hereby executed effective as of the date first
set forth above.

"COMPANY"

QUALITY CARE SOLUTIONS, INC.,
a Delaware corporation

By:   /s/ Gregory S. Anderson
      ______________________________
      Gregory S. Anderson, President

Date: ______________________________

"PURCHASERS"

DOMINION FUND IV, A DELAWARE LIMITED PARTNERSHIP

by its general partner, DOMINION MANAGEMENT IV, L.L.C.

/s/ Brian Smith
____________________________________
By:     Brian Smith
Title:  Member
Date:   May 29, 1998

    [Signature page to Quality Care Solutions, Inc. Series C Preferred Stock
                              Purchase Agreement]
<PAGE>   21

                                   EXHIBIT A
                (To Series C Preferred Stock Purchase Agreement)

         RESTATED CERTIFICATE OF DESIGNATION OF THE SERIES A PREFERRED,
       RESTATED CERTIFICATE OF DESIGNATION OF THE SERIES B PREFERRED AND
              CERTIFICATE OF DESIGNATION OF THE SERIES C PREFERRED

                [See Exhibit 3.1 of S-1 Registration Statement]

<PAGE>   22

                                   EXHIBIT B
                (To Series C Preferred Stock Purchase Agreement)

                             SCHEDULE OF EXCEPTIONS

                        (Omitted on original document).
<PAGE>   23

                                   EXHIBIT C
                (To Series C Preferred Stock Purchase Agreement)

                          SHAREHOLDER RIGHTS AGREEMENT

                                   Attached.

                [See Exhibit 4.3 of S-1 Registration Statement]
<PAGE>   24

                                   EXHIBIT D
                (To Series C Preferred Stock Purchase Agreement)

FORM OF EMPLOYMENT, CONFIDENTIAL INFORMATION AND INVENTION ASSIGNMENT AGREEMENT

                        (Omitted on original document).
<PAGE>   25
                                   EXHIBIT E
                (To Series C Preferred Stock Purchase Agreement)

                    FORM OF LEGAL OPINION OF BRYAN CAVE LLP

                         (Omitted on Original Document)
<PAGE>   26
                                   EXHIBIT F
                (To Series C Preferred Stock Purchase Agreement)

                             COMPLIANCE CERTIFICATE

                         (Omitted on Original Document.)
<PAGE>   27
                                   EXHIBIT G
                (To Series C Preferred Stock Purchase Agreement)

                            MANAGEMENT RIGHTS LETTER

                        (Omitted on Original Document.)
<PAGE>   28
                                   SCHEDULE I

                (To Series C Preferred Stock Purchase Agreement)

               SCHEDULE OF PURCHASERS OF SERIES C PREFERRED STOCK

<TABLE>
<CAPTION>
  NAME, ADDRESS AND FAX NUMBER OF           NO. OF          DOLLAR
            PURCHASER                       SHARES          AMOUNT          CLOSING DATE
<S>                                       <C>            <C>                 <C>
Dominion Fund IV, a Delaware Limited      5,194,805      $3,999,999.85       May 29, 1998
Partnership
44 Montgomery Street, Suite 4200
San Francisco, CA 94104
Fax: 415-394-9245
</TABLE><PAGE>   1

                                                                     Exhibit 4.3

                          QUALITY CARE SOLUTIONS, INC.

                          SHAREHOLDER RIGHTS AGREEMENT

     This Shareholder Rights Agreement (the "AGREEMENT") is made effective as
of May 29, 1998 by and among Quality Care Solutions, Inc., a Nevada corporation
(the "COMPANY"), certain holders of Series A Preferred Stock of the Company as
set forth in Exhibit A attached hereto (the "SERIES A HOLDERS"), certain
holders of Series B Preferred Stock of the Company as set forth on Exhibit A
(the "SERIES B HOLDERS"), the purchasers (the "PURCHASERS") of Series C
Preferred Stock of the Company as set forth in Exhibit A pursuant to the Series
C Preferred Stock Purchase Agreement dated May 29, 1998 (the "PURCHASE
AGREEMENT"), the holders of the Warrants (as defined below) as set forth on
Exhibit A (the "WARRANT HOLDERS") and certain significant shareholders as set
forth on Exhibit A (the "SIGNIFICANT HOLDERS").

                                    RECITALS

     A.   The Series A Holders and Series B Holders were entitled to certain
registration rights pursuant to their respective certificates of designation.

     B.   The holders of the Company's Series A Preferred Stock and Series B
Preferred Stock have approved, by the requisite levels of consent, an amendment
of each of their respective certificates of designation removing the
registration and information rights contained therein. In connection therewith,
the Series A Holders and the Series B Holders have been offered the opportunity
to be granted rights (including certain registration and information rights)
and to be bound by the restrictions contained in this Agreement.

     C.   The obligations of the Company and the Purchasers under the Purchase
Agreement are conditioned, among other things, upon the execution and delivery
of this Agreement by the Company and the Purchasers.

                                   AGREEMENT

     NOW, THEREFORE, in consideration of the mutual promises and covenants
hereinafter set forth, all parties hereto agree as follows:

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

<PAGE>   2
     "COMMISSION" means the Securities and Exchange Commission or any other
Federal agency at the time administering the Securities Act.

     "CONVERSION STOCK" means the Common Stock issued or issuable pursuant to
conversion of the Preferred Stock.

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

     "HOLDER" means any Series A Holder, Series B Holder, Warrant Holder or
Purchaser holding Registrable Securities, or any person holding Registrable
Securities to whom the rights under this Agreement have been transferred in
accordance with Section 5.10 hereof.

     "INITIATING HOLDERS" means

          (i)  for the purpose of section 5.1, any Holder or Holders who, in
the aggregate, hold not less than 30% of all Registrable Securities then
outstanding; and

          (ii) for the purposes of section 5.3, any Holder or Holders who, in
the aggregate, hold not less than 10% of all Registrable Securities then
outstanding.

     "PREFERRED STOCK" shall mean the Series A Preferred Stock, the Series B
Preferred Stock and the Series C Preferred Stock of the Company.

     "REGISTRABLE SECURITIES" means (i) the Conversion Stock, (ii) the Warrant
Stock and (iii) any Common Stock of the Company issued or issuable in respect
of the Conversion Stock or the Warrant Stock upon any conversion, stock split,
stock dividend, recapitalization, or similar event; provided, however, that
securities shall only be treated as Registrable Securities if and so long as
(i) they have not been registered or sold to or through a broker or dealer or
underwriter in a public distribution or a public securities transaction and
(ii) the registration rights with respect to such securities have not
terminated pursuant to Section 5.11.

     The terms "REGISTER," "REGISTERED" and "REGISTRATION" refer to a
registration effected by preparing and filing a registration statement in
compliance with the Securities Act, and the declaration or ordering of the
effectiveness of such registration statement.

     "REGISTRATION EXPENSES" shall mean all expenses, except as otherwise
stated in the definition of "Selling Expenses", incurred by the Company in
complying with Sections 5.1, 5.2 and 5.3 hereof, including without limitation,
all registration, qualification and filing fees, printing expenses, escrow
fees, fees and disbursements of counsel for the Company and one special counsel
to the selling stockholders for each registration, blue sky fees and expenses,
the expense of any

                                      -2-

<PAGE>   3
special audits incident to or required by any such registration (but excluding
the compensation of regular employees of the Company which shall be paid in any
event by the Company).

     "RESTRICTED SECURITIES" shall mean securities of the Company required to
bear the legends set forth in Section 3 hereof.

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

          "SELLING EXPENSES" shall mean all underwriting discounts, selling
commissions and stock transfer taxes applicable to the securities registered by
the Holders and, except as set forth in the definition of "Registration
Expenses", all fees disbursements of separate counsel for any Holder.

          "SIGNIFICANT HOLDERS' STOCK" means all shares of Common Stock,
Conversion Stock or Warrant Stock held by all Significant Holders.

          "WARRANTS" means the warrants to purchase an aggregate of 100,000
shares of Common Stock of the Company at an exercise price of $1.05, which
warrants are held by the Warrant Holders as of the date of this Agreement.

          "WARRANT STOCK" means the Common Stock issued or issuable pursuant to
exercise of the Warrants.

     2.   RESTRICTIONS ON TRANSFERABILITY.

          2.1 GENERALLY. The Preferred Stock, the Conversion Stock, the
Warrants, the Warrant Stock, the Significant Holders' Stock and any other
securities issued in respect of such stock upon any stock split, stock
dividend, recapitalization, merger, or similar event, shall not be sold,
assigned, transferred or pledged except upon the conditions specified in this
Agreement, which conditions are intended to ensure compliance with the
provisions of the Securities Act. Each such holder or transferee will cause any
proposed purchaser, assignee, transferee, or pledgee of any such shares held by
the Holder or transferee to agree to take and hold such securities subject to
the restrictions and upon the conditions specified in this Agreement, including
without limitation the restrictions set forth in Sections 7 and 9.

     2.3  RESTRICTIONS ON TRANSFERABILITY OF SIGNIFICANT HOLDERS' STOCK.

          (a)  General Restriction. Except as set out in Section 2.2(b), the
Significant Holders' Stock and any other securities issued in respect of such
stock upon any stock split, stock dividend, recapitalization, merger, or
similar event, shall not be sold, assigned, trans-

                                      -3-
<PAGE>   4
ferred or pledged except with the written consent of Purchasers holding not
less than a majority of the Conversion Stock held by all Purchasers in the
aggregate.

          (b)  EXCEPTION.  Notwithstanding Section 2.2(a) and Section 8, J.
Mikel Echeverria shall be permitted to sell any shares of Common Stock
beneficially held by him without first obtaining the consents described in such
Section 2.2(a), provided that: (i) sales consummated in any calendar year do not
exceed 100,000 shares of Common Stock, as adjusted for any stock splits or
consolidations, (ii) aggregate sales consummated between the date of this
Agreement and the first registered public offering of the Common Stock of the
Company do not exceed 200,000 shares of Common Stock, as adjusted for any stock
splits or consolidations and (iii) sales are subject to the provisions of
Section 3 and the last sentence of Section 4 of this Agreement.

     3.   RESTRICTIVE LEGEND.  Each certificate representing the Preferred
Stock, the Conversion Stock, the Warrants, the Warrant Stock, the Significant
Holders' Stock or any other securities issued in respect of such stock upon any
stock split, stock dividend, recapitalization, merger, or similar event, shall
(unless otherwise permitted by the provisions of Section 4 below) be stamped or
otherwise imprinted with legends in substantially the following form (in
addition to any legends required by agreement or by applicable state securities
laws):

     THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
     THE SECURITIES ACT OF 1933, AS AMENDED, AND HAVE BEEN ACQUIRED FOR
     INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR
     DISTRIBUTION THEREOF. SUCH SHARES GENERALLY MAY NOT BE SOLD OR TRANSFERRED
     IN THE ABSENCE OF SUCH REGISTRATION UNLESS THE COMPANY RECEIVES AN OPINION
     OF COUNSEL REASONABLY ACCEPTABLE TO IT STATING THAT SUCH SALE OR TRANSFER
     IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF
     SAID ACT.

     THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A LOCKUP PERIOD
     OF UP TO 180-DAYS FOLLOWING THE EFFECTIVE DATE OF CERTAIN REGISTRATION
     STATEMENTS OF THE COMPANY FILED UNDER THE SECURITIES ACT OF 1933, AS
     AMENDED, AS SET FORTH IN AN AGREEMENT BETWEEN THE ISSUER AND THE ORIGINAL
     HOLDER OF THESE SHARES, A COPY OF WHICH MAY BE OBTAINED AT THE PRINCIPAL
     OFFICE OF THE ISSUER. SUCH LOCKUP PERIOD IS BINDING ON TRANSFEREES OF THESE
     SHARES.

     Each Series A Holder, Series B Holder, Purchaser, Warrant Holder and
Significant Holder consents to the Company making a notation on its records and
giving instructions to any

                                      -4-
<PAGE>   5

transfer agent of its capital stock in order to implement the restrictions on
transfer established in this Agreement.

     4.   NOTICE OF PROPOSED TRANSFERS.  The holder of each certificate
representing Restricted Securities by acceptance thereof agrees to comply in
all respects with the provisions of this Section 4. Without in any way limiting
the immediately preceding sentence, no sale, assignment, transfer or pledge of
Restricted Securities shall be made by any holder thereof to any person unless
such person shall first agree in writing to be bound by the restrictions of
this Agreement including, without limitation, Section 7 and this Section 4.
Prior to any proposed sale, assignment, transfer or pledge of any Restricted
Securities, unless there is in effect a registration statement under the
Securities Act covering the proposed transfer, the holder thereof shall give
written notice to the Company of such holder's intention to effect such
transfer, sale, assignment or pledge. Each such notice shall describe the
manner and circumstances of the proposed transfer, sale, assignment or pledge
in sufficient detail, and, if reasonably requested by the Company, the holder
shall also provide, at such holder's expense, either (i) a written opinion of
legal counsel addressed to the Company, to the effect that the proposed
transfer of the Restricted Securities may be effected without registration
under the Securities Act, or (ii) a "no action" letter from the Commission to
the effect that the transfer of such securities without registration will not
result in a recommendation by the staff of the Commission that action be taken
with respect thereto, whereupon the holder of such Restricted Securities shall
be entitled to transfer such Restricted Securities in accordance with the terms
of the notice delivered by the holder to the Company; provided, however, that
the Company shall not request an opinion of counsel or "no action" letter with
respect to (i) a transfer not involving a change in beneficial ownership, (ii)
a transaction involving the distribution without consideration of Restricted
Securities by the holder to its constituent partners or members in proportion
to their ownership interests in the holder, (iii) a transaction involving the
transfer without consideration of Restricted Securities by an individual holder
during such holder's lifetime by way of gift or on death by will or intestacy
or (iv) a transfer to an "affiliate" of the transferor, as such term is defined
under Rule 144. Each certificate evidencing the Restricted Securities
transferred as above provided shall bear, except if such transfer is made
pursuant to Rule 144, the appropriate restrictive legend set forth in Section 3
above, except that such certificate shall not bear such restrictive legend if
in the opinion of counsel for such holder and counsel for the Company such
legend is not required in order to establish compliance with any provision of
the Securities Act.

     5.   REGISTRATION.

          5.1  REQUESTED REGISTRATION.

               (a)  Request for Registration.  In case the Company shall
receive from Initiating Holders a written request that the  Company effect any
registration with respect to shares of Registrable Securities, the Company will:

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

                                      -5-
<PAGE>   6
          (ii) as soon as practicable, use its best efforts to effect such
registration as part of a firm commitment underwritten public offering with
underwriters reasonably acceptable to the Initiating Holders and the Company
(including, without limitation, appropriate qualification under applicable state
securities laws and appropriate compliance with applicable regulations issued
under the Securities Act and any other governmental requirements or regulations)
as may be so requested and as would permit or facilitate the sale and
distribution of all or such portion of such Registrable Securities as are
specified in such request, together with all or such portion of the Registrable
Securities of any Holder or Holders joining in such request by delivering a
written notice to such effect to the Company within 20 days after the date of
such written notice from the Company.

     Notwithstanding the foregoing, the Company shall not be obligated to take
any action to effect or complete any such registration pursuant to this Section
5.1:

               (A) Prior to the earlier of (i) May 29, 2000 and (ii) six months
after the effective date of the Company's first registered public offering of
its Common Stock;

               (B) Unless the requested registration would include at least 30%
of the Registrable Securities or any lesser percentage so long as the aggregate
offering price of all Registrable Securities sought to be registered by all
Holders, net of underwriting discounts and commissions, would exceed $5,000,000;

               (C) During the period starting with the date thirty (30) days
prior to the Company's estimated date of filing of, and ending on the date six
(6) months immediately following the effective date of, any registration
statement pertaining to securities of the Company (other than a registration of
securities in a Rule 145 transaction or with respect to an employee benefit
plan), provided that the Company is actively employing in good faith all
reasonable efforts to cause such registration statement to become effective;

               (D) After the Company has completed one registration pursuant to
this subparagraph 5.1(a); or

               (E) If the Company shall furnish to the Initiating Holders a
certificate signed by the President of the Company stating that, because it is
necessary for the Company to consummate a pending transaction, in the good
faith judgment of the Board of Directors it would be seriously detrimental to
the Company or its stockholders for a registration statement to be filed in the
near future. In such case, the Company's obligation to use its best efforts to
register, qualify or comply under this Section 5.1(a) shall be deferred for a
period not to exceed 90 days from the date of receipt of the written request
from the Initiating Holders, provided that the Company may not exercise this
deferral right more than once per twelve month period.

                                      -6-
<PAGE>   7
     Subject to the foregoing clauses (A) through (E), the Company shall file a
registration statement covering the Registrable Securities so requested to be
registered as soon as practicable after receipt of the request or requests of
the Initiating Holders.

          (b) Consent by Holders on the Request for Registration. A written
request for a vote or the solicitation of consents may be made by holders
holding an aggregate of 5% of all Registrable Securities. Within ten days after
receipt of such request, the Company will give written notice to all Holders
whose vote is requested and set a meeting of those Holders, which shall be
within 60 days of such request to vote on the exercise of their rights under
this Section 5.1.

          (c) Underwriting. In the event of a registration pursuant to Section
5.1, the Company shall advise the Holders as part of the notice given pursuant
to Section 5.1(a)(i) that the right of any Holder to registration pursuant to
Section 5.1 shall be conditioned upon such Holder's participation in the
underwriting arrangements required by this Section 5.1, and the inclusion of
such Holder's Registrable Securities in the underwriting to the extent
requested shall be limited to the extent provided herein.

     The Company shall, together with all Holders proposing to distribute their
securities through such underwriting, enter into an underwriting agreement in
customary form with the managing underwriter selected for such underwriting by a
majority in interest of the Initiating Holders, but subject to the Company's
reasonable approval. Notwithstanding any other provision of this Section 5.1,
if the managing underwriter advises the Initiating Holders in writing that
marketing factors require a limitation of the number of shares to be
underwritten, then the Company shall so advise all Holders requesting to be
included in the registration and underwriting and the number of shares of
Registrable Securities that may be included in the registration and
underwriting shall be allocated among all Holders requesting to be included in
the registration and underwriting in proportion, as nearly as practicable, to
the respective amounts of Registrable Securities held by them at the time of
filing the registration statement. No Registrable Securities excluded from the
underwriting by reason of the underwriter's marketing limitation shall be
included in such registration. To facilitate the allocation of shares in
accordance with the above provisions, the Company or the underwriters may round
the number of shares allocated to any Holder to the nearest 100 shares. If any
Holder of Registrable Securities disapproves of the terms of the underwriting,
such person may elect to withdraw therefrom by written notice to the Company.
If other selling shareholders who are employees, officers, directors or other
affiliates of the Company have requested registration of securities in the
proposed offering, the Company will reduce or eliminate such other selling
shareholders' securities before any reduction or elimination of Registrable
Securities to be included in such registration.

     5.2 COMPANY REGISTRATION.

          (a) Notice of Registration. If at any time or from time to time the
Company shall determine to register any of its equity securities, either for
its own account or the

                                      -7-
<PAGE>   8
account of a Holder or other holders, other than (i) a registration relating
solely to employee benefit plans or (ii) a registration relating solely to a
Rule 145 transaction:

               (i)  promptly give to each Holder written notice thereof; and

               (ii) include in such registration (and any related qualifications
including compliance with Blue Sky laws), and in any underwriting involved
therein, all the Registrable Securities specified in a written request or
requests, made within 20 days after the date of such written notice from the
Company, by any Holder.

     (b) Underwriting. If the registration of which the Company gives notice is
for a registered public offering involving an underwriting, the Company shall so
advise the Holders as a part of the written notice given pursuant to Section
5.2(a)(i). In such event, the right of any Holder to registration pursuant to
Section 5.2 shall be conditioned upon such Holder's participation in such
underwriting and the inclusion of Registrable Securities in the underwriting
shall be limited to the extent provided herein.

     All Holders proposing to distribute their securities through such
underwriting shall (together with the Company and the other Holders distributing
their securities through such underwriting) enter into an underwriting agreement
in customary form with the managing underwriter selected for such underwriting
by the Company. Notwithstanding any other provision of this Section 5.2, if the
managing underwriter determines that marketing factors require a limitation of
the number of shares to be underwritten, the managing underwriter may limit the
Registrable Securities to be included in such registration (i) in the case of
the Company's initial public offering, to zero, and (ii) in the case of any
other offering, to an amount no less than 30% of all shares to be included in
such offering, provided that if other selling shareholders who are employees,
officers, directors or other affiliates of the Company have requested
registration of securities in the proposed offering, the Company will reduce or
eliminate such other selling shareholders' securities before any reduction or
elimination of Registrable Securities to be included in such registration. The
Company shall so advise all Holders requesting to be included in the
registration and underwriting and the number of shares of Registrable Securities
that may be included in the registration and underwriting shall be allocated
among all the Holders requesting to be included in the registration and
underwriting in proportion, as nearly as practicable, to the respective amounts
of Registrable Securities held by them at the time of filing the registration
statement. To facilitate the allocation of shares in accordance with the above
provisions, the Company or the underwriters may round the number of shares
allocated to any Holder to the nearest 100 shares. If any Holder disapproves of
the terms of any such underwriting, such person may elect to withdraw therefrom
by written notice to the Company.

     (c) Right to Terminate Registration. The Company shall have the right to
terminate or withdraw any registration initiated by it under this Section 5.2
prior to the effectiveness of such registration whether or not any Holder has
elected to include securities in such registration

                                      -8-

<PAGE>   9
and shall give notice to each Holder who has elected to include securities in
such registration as soon as practicable after such termination or withdrawal.

     5.3 REGISTRATION ON FORM S-3.

          (a) Request for Registration. In case the Company shall receive
from Initiating Holders a written request that the Company file a registration
statement on Form S-3 (or any successor form to Form S-3) for a public offering
of shares of the Registrable Securities the aggregate price to the public of
which, net of underwriting discounts and commissions, would exceed $500,000, and
the Company is a registrant entitled to use Form S-3 to register the Registrable
Securities for such an offering, the Company shall use its best efforts to cause
such Registrable Securities to be registered for the offering on such form and
to cause such Registrable Securities to be qualified in such jurisdictions as
such Holder or Holders may reasonably request; provided, however, that the
Company shall not be required to effect more than two registrations pursuant to
this Section 5.3 in any twelve (12) month period. If such offer is to be an
underwritten offer, the underwriters must be acceptable to both the Initiating
Holders and the Company. The Company shall inform the other Holders of the
proposed registration and offer them upon at least 20 days written notice the
opportunity to participate. In the event the registration is proposed to be
part of a firm commitment underwritten public offering, the substantive
provisions of Section 5.1(b) shall be applicable to each such registration
initiated under this Section 5.3

          (b) Notwithstanding the foregoing, the Company shall not be obligated
to take any action pursuant to this Section 5.3:

               (i)   If the Company, within ten (10) days of the receipt of the
request of the Initiating Holders, gives notice of its bona fide intention to
effect the filing of a registration statement with the Commission within ninety
(90) days of receipt of such request (other than with respect to a registration
statement relating to a Rule 145 transaction, an offering solely to employees or
any other registration which is not appropriate for the registration of
Registrable Securities);

               (ii)   During the period starting with the date thirty (30) days
prior to the Company's estimated date of filing of, and ending on the date six
(6) months immediately following the effective date of, any registration
statement pertaining to securities of the Company (other than a registration of
securities in a Rule 145 transaction or with respect to an employee benefit
plan), provided that the Company is actively employing in good faith all
reasonable efforts to cause such registration statement to become effective; or

               (iii) If the Company shall furnish to the Initiating Holders a
certificate signed by the President of the Company stating that, because it is
necessary for the Company to consummate a proposed transaction, in the good
faith judgment of the Board of Directors, it would be seriously detrimental to
the Company or its stockholders for a registration statement to be filed in the
near future, then the Company's obligation to use its best efforts to file a

                                      -9-

<PAGE>   10
registration statement shall be deferred for a period not to exceed 90 days from
the receipt of the request to file such registration by such Initiating Holder
or Holders, provided that the Company may not exercise this deferral right more
than once per twelve month period.

     5.4  SUBSEQUENT REGISTRATION RIGHTS.

          (a) Without the consent of any holder of Registrable Securities
hereunder, the Company may grant to any holder of securities of the Company
registration rights entirely inferior and subordinate to those granted
hereunder.

          (b) The Company shall not enter into any agreement granting any holder
or prospective holder of any securities of the Company registration rights
superior to or on a pari passu basis with the rights granted the Purchasers
hereunder without the written consent of the holders of a majority of the
Registrable Securities.

          (c) Notwithstanding the foregoing, persons who purchase shares of
Series C Preferred Stock in the Second Closing (as such term is defined in the
Purchase Agreement) shall become parties to this Agreement by executing a
counterpart hereof and any Series A Holder and any Series B Holder may become
parties to this Agreement by executing a counterpart hereof within 30 days after
the First Closing Date (as such term is defined in the Purchase Agreement). The
Company may, without obtaining any further consent of the holders of Registrable
Securities, amend the Schedule of Holders to reflect such additional parties.

     5.5  EXPENSES OF REGISTRATION. All Registration Expenses incurred in
connection with all registrations pursuant to this Section 5 shall be borne by
the Company. Notwithstanding the foregoing, in the event that Initiating Holders
cause the Company to begin a registration pursuant to Section 5.1, and the
request for such registration is subsequently withdrawn by the Initiating
Holders, all Holders shall be deemed to have forfeited their right to one
registration under Section 5.1, unless the Initiating Holders pay for, or
reimburse the Company for, the Registration Expenses incurred in connection with
such withdrawn or incomplete registration. Unless otherwise stated, all Selling
Expenses relating to securities registered on behalf of the Holders and all
other registration expenses shall be borne by the Holders of such securities pro
rata on the basis of the number of shares so registered or proposed to be so
registered.

     5.6  REGISTRATION PROCEDURES. In the case of each registration effected by
the Company pursuant to this Agreement, the Company will keep each Holder
advised in writing as to the initiation of such registration and as to the
completion thereof. The Company will:

          (a) prepare and file with the Commission within 90 days after the
receipt of request for registration, a registration statement on any appropriate
form under the Securities Act, which form shall be available for sale of the
Registrable Securities in accordance with the intended method or methods of
distribution thereof and use its best efforts to cause such registration
statement to become effective; provided that before filing a registration
statement or prospectus or any

                                      -10-
<PAGE>   11
amendment or supplements thereto, including documents incorporated by reference
after the initial filing of any registration statement, the Company will
furnish to the Holders of the Registrable Securities covered by such
registration statement (the "PARTICIPATING HOLDERS") and the underwriters
copies of all such documents provided to be filed, which documents will be
subject to the review of such Holders and underwriters;

     (b) prepare and file with the Commission such amendments and
post-effective amendments to the registration statement as may be necessary to
keep such registration statement effective for a reasonable period not to
exceed 180 days; cause the related 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 comply with the provisions of the
Securities Act with respect to the disposition of all securities covered by
such registration statement during such period in accordance with the intended
methods of disposition by the sellers thereof set forth in such registration
statement or supplement to such prospectus;

     (c) notify the Participating Holders and the managing underwriters
promptly, and (if requested by any such person) confirm such advice in writing;
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; of any request by the Commission
for amendments or supplements to a registration statement or related prospectus
or for additional information; of the issuance by the Commission of any stop
order suspending the effectiveness of a registration statement or the initiation
of any proceedings for that purpose; of the receipt by the Company of any
notification with respect to the suspension of the qualification of any of the
Registrable Securities for sale in any jurisdiction or the initiation or
threatening of any proceeding for such purpose; and of the happening of any
event that makes any statement of a material fact made in the registration
statement, the prospectus or any documents incorporated therein by reference
untrue or which requires the making of any changes in the registration statement
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 not misleading;

     (d) make every reasonable effort to obtain the withdrawal of any order
suspending the effectiveness of a registration statement at the earliest
possible moment;

     (e) if reasonably requested by the managing underwriters, immediately
incorporate in a prospectus supplement or post-effective amendment such
information as the managing underwriters believe (on advice of counsel) should
be included therein as required by applicable law relating to such sale of
Registrable Securities, including, without limitation, information with respect
to the purchase price being paid for the Registrable Securities by such
underwriters and with respect to any other terms of the underwritten (or
"best-efforts" underwritten) offering; and make all required filings of such
prospectus supplement or post-effective amendment as soon as notified of the
matters to be incorporated in such prospectus supplement or post-effective
amendment;

                                      -11-

<PAGE>   12
     (f) furnish to each managing underwriter, without charge, at least one
signed copy of the registration statement and any post-effective amendment,
including financial statements and any schedules, all documents incorporated
therein by reference and all exhibits (including those incorporated by
reference);

     (g) deliver to each Participating Holder and the underwriters without
charge, as many copies of the prospectus or prospectuses (including each
preliminary prospectus and any amendment or supplement thereto as such persons
may reasonably request; the Company consents to the use of such prospectus and
of any amendment or supplement thereto by each of the Participating Holders and
the underwriters in connection with the offering and sale of the Registrable
Securities covered by such prospectus or any amendment or supplement thereto;

     (h) prior to any public offering of the Registrable Securities, cooperate
with the Participating Holders, the underwriters, if any, and their respective
counsel in connection with and use its best efforts to effect the registration
or qualification of such Registrable Securities for offer and sale under the
securities or Blue Sky laws of such jurisdictions within the United States as
any selling Participating Holder or underwriter reasonably requests in writing,
keep each such registration or qualification effective during the period such
registration statement is required to be kept effective and do any and all other
acts or things necessary or advisable to enable the disposition in such
jurisdictions of the Registrable Securities covered by the applicable
registration statement; provided that the Company will not be required to
qualify to do business in any jurisdiction where it is not then so qualified or
to take any action which would subject the Company to general service of process
in any jurisdiction where it is not at the time so subject;

     (i) use its best efforts to cause the Registrable Securities covered by
the applicable registration statement to be registered with or approved by such
other governmental agencies or authorities within the United States as may be
necessary to enable the seller or sellers thereof or the underwriters to
consummate the disposition of such Registrable Securities;

     (j) as necessary, prepare a supplement or post-effective amendment to the
applicable registration statement or related prospectus or any documents
incorporated therein by reference or file any other required document so that,
as thereafter delivered to the purchasers of the Registrable Securities being
sold thereunder, such prospectus will not contain an untrue statement of a
material fact or omit to state any material fact necessary to make the
statements therein not misleading;

     (k) use its best efforts to cause all Registrable Securities covered by
the registration statement to be listed on each securities exchange, if any, on
which similar securities issued by the Company are then listed;

     (l) enter into such agreements (including, an underwriting agreement) and
take all such other action reasonably required in connection therewith in order
to expedite or facilitate the disposition of the Registrable Securities and in
such connection, if the registration is in connection with an underwritten
offering; make such representations and warranties to the

                                      -12-
<PAGE>   13
underwriters in such form, substance and scope as are customarily made by
issuers to underwriters in underwritten offerings and confirm the same if and
when requested; obtain opinions of counsel to the Company and updates thereof
(which counsel and opinions in form, scope and substance shall be reasonably
satisfactory to the underwriters) addressed to the underwriters covering the
matters customarily covered in opinions requested in underwritten offerings and
such other matters as may be reasonably requested by such underwriters; obtain
"cold comfort" letters and updates thereof from the Company's accountants
addressed to the underwriters; such letters to be in customary form and
covering matters of the type customarily covered in "cold comfort" letters by
underwriters in connection with underwritten offerings; set forth in full in
any underwriting agreement entered into the indemnification provisions and
procedures of Section 5.7 hereof with respect to all parties to be indemnified
pursuant to Section 5.7; and deliver such documents and certificates as may be
reasonably required by the underwriters to evidence compliance with the
preceding clause above and with any customary conditions contained in the
underwriting agreement or other agreement entered into by the Company; the
above shall be done at each closing under such underwriting or similar
agreement or as and to the extent required thereunder;

          (m) provide a transfer agent and registrar for the Registrable
Securities not later than the effective date of such registration statement;

          (n) make available for inspection by one or more representatives of
the Participating Holders, any underwriter participating in any disposition
pursuant to such registration, and any attorney or accountant retained by such
Participating Holders or underwriter, all financial and other records,
pertinent corporate documents and properties of the Company, and cause the
Company's officers, directors and employees to supply all information
reasonably requested by any such representatives, in connection with such; and

          (o) otherwise use its best efforts to comply with all applicable
federal and state regulations; and take such other action as may be reasonably
necessary to or advisable to enable each Participating Holder and each
underwriter to consummate the sale or disposition in such jurisdiction or
jurisdictions in which any such Participating Holder or underwriter shall have
required that the Registrable Securities be sold.

Except as otherwise provided herein, the Company shall have sole control in
connection with the preparation, filing, withdrawal, amendment or supplementing
of each registration statement the selection of underwriters, and the
distribution of any preliminary prospectus included in the registration
statement, and may include within the coverage thereof additional shares of
Common Stock or other securities for its own account or for the account of one
or more of its other security holders. The Company may require that each
Participating Holder furnish to the Company such information required for the
distribution of the Common Stock and such other information as may otherwise be
required by the Act to be included in such registration statement.

                                   -13-

<PAGE>   14

               5.7  INDEMNIFICATION.

                    (a)  The Company will indemnify each Holder, each of its
          officers and directors and partners, and each person controlling such
          Holder within the meaning of Section 15 of the Securities Act, with
          respect to which registration has been effected pursuant to this
          Agreement, against all expenses, claims, losses, damages or
          liabilities (or actions in respect thereof), including any of the
          foregoing incurred in settlement of any litigation, commenced or
          threatened, arising out of or based on any untrue statement (or
          alleged untrue statement) of a material fact contained in any
          registration statement, prospectus, offering circular or other
          document, or any amendment or supplement thereto, incident to any such
          registration, or based on any omission (or alleged omission) to state
          therein a material fact required to be stated therein or necessary to
          make the statements therein, in light of the circumstances in which
          they were made, not misleading, or any violation by the Company of the
          Securities Act, the Exchange Act, state securities laws or any rule or
          regulation promulgated under such laws applicable to the Company in
          connection with any such registration, and the Company will reimburse
          each such Holder, each of its officers and directors, and each person
          controlling such Holder, for any legal and any other expenses
          reasonably incurred, as such expenses are incurred, in connection with
          investigating, preparing or defending any such claim, loss, damage,
          liability or action, provided that the Company will not be liable in
          any such case to the extent that any such claim, loss, damage,
          liability or expense arises out of or is based on any untrue statement
          or omission or alleged untrue statement or omission, made in reliance
          upon and in conformity with written information furnished to the
          Company by an instrument duly executed by such Holder or controlling
          person, and stated to be specifically for use therein; provided,
          however, that the foregoing indemnity agreement is subject to the
          condition that, insofar as it relates to any such untrue statement,
          alleged untrue statement, omission or alleged omission made in a
          preliminary prospectus on file with the Commission at the time the
          registration statement becomes effective or the amended prospectus
          filed with the Commission pursuant to Rule 424(b) (the "FINAL
          PROSPECTUS"), such indemnity agreement  shall not inure to the benefit
          of any Holder, if due to the fault of such Holder a copy of the Final
          Prospectus was not furnished to the person asserting the loss,
          liability, claim or damage at or prior to the time such action is
          required by the Securities Act, and if the Final Prospectus would have
          cured the defect giving rise to the loss, liability, claim or damage.

                    (b) Each Holder will, if Registrable Securities held by such
          Holder are included in the securities as to which such registration is
          being effected, indemnify the Company, each of its directors and
          officers, other holders of the Company's securities covered by such
          registration statement, each person who controls the Company within
          the meaning of Section 15 of the Securities Act, and each other such
          Holder, each of its officers and directors and each person controlling
          such Holder within the meaning of Section 15 of the Securities Act,
          against all claims, losses, damages and liabilities (or actions in
          respect thereof) arising out of or based on any untrue statement (or
          alleged untrue statement) of a material fact contained in any such
          registration statement, prospectus, offering circular or other
          document, or any omission (or alleged omission) to state therein a
          material fact required to be stated therein or necessary to make the
          statements therein not misleading, or any violation by the Holder of
          the Securities Act, the Exchange Act, state securities laws or any
          rule or regulation promulgated under such laws applicable to the
          Holder, and

                                      -14-

<PAGE>   15
will reimburse the Company, such other Holders, such directors, officers,
persons, underwriters or control persons for any legal or any other expenses
reasonably incurred, as such expenses are incurred, in connection with
investigating or defending any such claim, loss, damage, liability or action,
but in the case of the Company or the other Holders or their officers,
directors or controlling persons, only to the extent that such untrue statement
(or alleged untrue statement) or omission (or alleged omission) is made in such
registration statement, prospectus, offering circular or other document in
reliance upon and in conformity with information furnished to the Company by
such Holder in writing and stated to be specifically for use therein.
Notwithstanding the foregoing, the liability of each Holder under this
subsection 5.7(b) shall be limited in an amount equal to the net proceeds
received by such Holder for the shares sold by such Holder, unless such
liability arises out of or is based on willful misconduct by such Holder.

          (c)  Each party entitled to indemnification under this Section 5.7
(the "INDEMNIFIED PARTY") shall give notice to the party required to provide
indemnification (the "INDEMNIFYING PARTY") promptly after such Indemnified
Party has actual knowledge of any claim as to which indemnity may be sought,
and shall permit the Indemnifying Party to assume the defense of any such claim
or any litigation resulting therefrom, provided that counsel for the
Indemnifying Party, who shall conduct the defense of such claim or litigation,
shall be approved by the Indemnified Party (whose approval shall not
unreasonably be withheld), and the Indemnified Party may participate in such
defense at such party's expense, and provided further that the failure of any
Indemnified Party to give notice as provided herein shall not relieve the
Indemnifying Party of its obligations under this Agreement unless the failure
to give such notice is materially prejudicial to an Indemnifying Party's
ability to defend such action and provided further, that the Indemnifying Party
shall not assume the defense for matters as to which there is a conflict of
interest or there are separate and different defenses. No Indemnifying Party,
in the defense of any such claim or litigation, shall, except with the consent
of each Indemnified Party (whose consent shall not be unreasonably withheld),
consent to entry of any judgment or enter into any settlement which does not
include as an unconditional term thereof the giving by the claimant or
plaintiff to such Indemnified Party of a release from all liability in respect
to such claim or litigation.

          (d)  In connection with each registration statement relating to the
disposition of Registrable Securities if the indemnification provided for in
subsection (i) hereof is unavailable to an Indemnified Party thereunder in
respect to any losses, claims, damages or liabilities referred to therein, then
the Company shall in lieu of indemnifying such Indemnified Party, contribute to
the amount paid or payable by such Indemnified Party as a result of such
losses, claims, damages or liabilities. The amount to be contributed by the
Company hereunder shall be an amount which is in the same proportionate
relationship to the total amount of such losses, claims, damages or liabilities
as the total net proceeds from the offering (before deducting expenses) of the
Registrable Securities bears to the total price to the public (including
underwriters' discounts) for the offering of securities covered by such
registration.

     5.8  INFORMATION BY HOLDER. The Holder or Holders of Registrable
Securities included in any registration shall furnish to the Company such
information regarding such Holder or

                                      -15-

<PAGE>   16
Holders, the Registrable Securities held by them and the distribution proposed
by such Holder or Holders as the Company may request in writing and as shall be
required in connection with any registration referred to in this Agreement.

     5.9  RULE 144 REPORTING. With a view to making available the benefits of
certain rules and regulations of the Commission which may at any time permit
the sale of the Restricted Securities to the public without registration, after
such time as a public market exists for the Common Stock of the Company, the
Company agrees to use all reasonable efforts to:

          (a)  Make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act, at all times after
the effective date that the Company becomes subject to the reporting
requirements of the Securities Act or the Exchange Act;

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

          (c)  So long as a Holder owns any Restricted Securities, to furnish to
the Holder forthwith upon request a written statement by the Company as to its
compliance with the reporting requirements of said Rule 144 (at any time after
90 days after the effective date of the first registration statement filed by
the Company for an offering of its securities to the general public), a copy of
the most recent annual or quarterly report of the Company, and such other
reports and documents of the Company and other information in the possession of
or reasonably obtainable by the Company as the Holder may reasonably request in
availing itself of any rule or regulation of the Commission allowing the Holder
to sell any such securities without registration.

     5.10 TRANSFER OF REGISTRATION RIGHTS. The rights to cause the Company to
register securities granted Holders under Sections 5.1, 5.2 and 5.3 may be
assigned to a transferee or assignee in connection with any permitted transfer
or assignment of Registrable Securities by the Holder provided that: (i) such
transfer is otherwise effected in accordance with applicable securities laws and
the terms of this Agreement, (ii) such assignee or transferee acquires at least
10,000 shares (as adjusted for stock splits, stock dividends, stock combinations
and the like) of Registrable Securities (including Preferred Stock convertible
into Registrable Securities or Warrants exercisable for Registrable Securities),
(iii) written notice is promptly given to the Company and (iv) such transferee
agrees to be bound by the provisions of this Agreement. Notwithstanding the
foregoing, the rights to cause the Company to register securities may be
assigned without compliance with item (ii) above to (x) any constituent partner,
member or shareholder of a Holder which is a Partnership, limited liability
company or corporation, or an affiliate (as such term is defined in Rule 405 of
the Securities Act) of such Holder of (y) a family member or trust for the
benefit of a Holder who is an individual, or a trust for the benefit of a family
member of such a Holder or the Holder's estate.

                                      -16-

<PAGE>   17
     5.11 TERMINATION OF REGISTRATION RIGHTS.  The rights granted pursuant to
Sections 5.1, 5.2 and 5.3 of this Agreement shall terminate on the date seven
years after the effective date of the Company's initial public offering.

     6.   FINANCIAL INFORMATION RIGHTS.

          (a)  The Company will provide the following reports to each Series A
Holder, Series B Holder, Warrant Holder and Purchaser:

               (i)  As soon as practicable after the end of the fiscal year
ending December 31, 1998 and each fiscal year thereafter, and in any event
within 90 days after the end of each such fiscal year, consolidated balance
sheets of the Company and its subsidiaries, if any, as of the end of such fiscal
year, and consolidated statements of operations and consolidated statements of
cash flows and stockholders' equity of the Company and its subsidiaries, if any,
for such year, prepared in accordance with generally accepted accounting
principles and setting forth in each case in comparative form the figures for
the previous fiscal year, all in reasonable detail and audited by independent
public accountants of national standing selected by the Company, and a
capitalization table in reasonable detail for such fiscal year; and

               (ii)  As soon as practicable after the end of the first, second
and third quarterly accounting periods in each fiscal year of the Company and
in any event within 45 days thereafter, a consolidated balance sheet of the
Company and its subsidiaries, if any, as of the end of each such quarterly
period, and consolidated statements of operations and consolidated statements of
cash flows of the Company and its subsidiaries, if any, for such period and for
the current fiscal year to date, prepared in accordance with generally accepted
accounting principles (other than accompanying notes), subject to changes
resulting from year-end audit adjustments, in reasonable detail and signed by
the principal financial or accounting officer of the Company, and a
capitalization table in reasonable detail for such quarterly period.

          (b)  The Company will provide to each Series A Holder, Series B
Holder, Purchaser and Warrant Holder such additional documents or reports as
may be required pursuant to the relevant Restated Certificate of Designation or
Certificate of Designation, as the case may be, or other instrument(s) relating
to the securities of the Company.

          (c)  The Company will provide the following reports to each Purchaser
who purchases shares of the Series C Preferred Stock of the Company in the
First Closing (as such term is defined in the Purchase Agreement):

               (i)  At least 30 days prior to the beginning of each fiscal
year, commencing with the fiscal year beginning January 1, 1999, a budget as
adopted by the Company's Board of Directors for the fiscal year;

                                      -17-
<PAGE>   18
               (ii) As soon as practicable after the end of the first and second
month of each quarterly accounting period, a consolidated balance sheet of the
Company and its subsidiaries (if any), as of the end of each such monthly
period, and consolidated statements of operations and consolidated statements of
cash flows of the Company and its subsidiaries (if any), for such persons and
for the current quarter to date, prepared in accordance with generally accepted
accounting principles (other than accompanying notes), subject to changes
resulting from quarter-end and year-end adjustments, in reasonable detail and
signed by the principal financial or accounting officer of the Company;

               (iii) Any materials sent to the board of directors of the
Company, as soon as practicable after such materials have been sent; and

               (iv) Copies of any claims made against the Company or its
affiliates which could, if successful, have a material adverse effect on the
Company.

          (d) Each Holder shall have, in addition to the right to inspect the
records of the Company as provided by Nevada law, the right to visit and inspect
any of the properties of the Company or any of its subsidiaries, and to discuss
the affairs, finances and accounts of the Company or any of its subsidiaries
with its officers.

          (e) The rights granted pursuant to Section 6(a), (b) and (c) may be
assigned to any transferee, other than a competitor or potential competitor of
the Company (as reasonably determined by the Company's Board of Directors) so
long as such transferee agrees in writing to be bound by the provisions of
Section 6(f), below.

          (f) Each Series A Holder, Series B Holder, Purchaser, Warrant Holder,
or transferee of rights under this Section 6 acknowledges and agrees that
certain information obtained pursuant to this Section 6 may be considered
nonpublic information and will be maintained in confidence by such Series A
Holder, Series B Holder, Purchaser, Warrant Holder or transferee and will not be
utilized by such Series A Holder, Purchaser, Warrant Holder or transferee in
connection with purchases or sales of the Company's securities except in
compliance with applicable state and Federal securities laws.

          (g) The covenants of the Company set forth in this Section 6 shall
terminate and be of no further force or effect upon the closing of a firm
commitment underwritten public offering.

     7. LOCKUP AGREEMENT. Each Series A Holder, Series B Holder, Purchaser,
Warrant Holder, Significant Holder and transferee who receives Conversion Stock,
Warrant Stock and any Common Stock of the Company issued or issuable in respect
of any of the foregoing upon any conversion, stock split, stock dividend,
recapitalization, or similar event, hereby agrees that, in connection with the
first registration of the offering of any securities of the Company under the
Securities Act for the account of the Company, if so requested by the Company or
any representative

                                      -18-

<PAGE>   19
of the underwriters (the "MANAGING UNDERWRITER"), such holder or transferee
shall not sell or otherwise transfer any securities of the Company during the
period specified by the Company's Board of Directors at the request of the
Managing Underwriter (the "MARKET STANDOFF PERIOD"), with such period not to
exceed 180 days following the effective date of such registration statement of
the Company filed under the Securities Act. The Company may impose stop-transfer
instructions with respect to securities subject to the foregoing restrictions
until the end of such Market Standoff Period. The Company shall use its
reasonable best efforts to place similar contractual lockup restrictions on all
capital stock issued now or hereafter to officers, directors, employees,
consultants or shareholders holding not less than 1% of the capital stock of the
Company and the effectiveness of the lockup provided by this section 7 shall be
conditional on the Company obtaining similar contractual lockup restrictions on
all capital stock issued now or hereafter to such officers, directors,
employees, consultants or shareholders. Notwithstanding the foregoing, the
provisions of this Section 7 shall not apply to a registration relating solely
to employee benefit plans on Form S-1 or Form S-8 or similar forms which may be
promulgated in the future, or a registration relating solely to a transaction
within Rule 145 of the Securities Act on Form S-4 or similar form which may be
promulgated in the future.

     8.   RIGHTS OF FIRST REFUSAL AND CO-SALE RIGHTS.

          (a) Rights of First Refusal. Except as set out in Section 2.2(b), in
the event that a Significant Holder receives a bona fide offer from any person
to purchase any of such Significant Holders' Stock, such Significant Holder (the
"SELLING SHAREHOLDER") shall first give the Secretary of the Company notice of
his intention to transfer such shares, describing the number of shares of
Significant Holders' Stock proposed to be transferred (the "OFFERED SHARES"),
the identity of the proposed transferee, and the price and terms upon which he
proposes to make such transfer (the "TRANSFER NOTICE"). The Secretary of the
Company will give the Transfer Notice to the Series A Holders, Series B Holders,
Purchasers and Warrant Holders (the "OFFEREE HOLDERS"). Within fifteen (15) days
after delivery of the Transfer Notice to the Offeree Holders, each Offeree
Holder may elect to purchase such person's pro rata share (as defined herein) of
the shares to be sold by the Selling Shareholder by giving written notice
thereof to the Secretary of the Company. If any of the Offeree Holders fails to
agree to purchase its pro rata share within such fifteen (15) days period, the
Secretary will give the Offeree Holders who did so agree (the "ELECTING
HOLDERS") notice of the number of Offered Shares which were not subscribed for.
The Electing Holders shall have ten (10) days from the date of such notice to
agree to purchase, pro rata or as they may agree, up to all of the Offered
Shares not purchased by such non-purchasing Offeree Holders. For the purpose of
the rights set forth in this Section 8(a), the "PRO RATA SHARE" of an Offeree
Holder shall be equal to the quotient obtained when the number of shares of
Common Stock issued or issuable upon conversion of the Preferred Stock held by
such Offeree Holder and upon exercise of the Warrants held by such Offeree
Holder is divided by the total number of shares of Conversion Stock and Warrant
Stock.

          (b) Co-Sale Right. To the extent the Offeree Holders decline to
exercise in full the right of first refusal within the fifteen (15) day plus ten
(10) day period specified above, the Secretary shall give written notice to all
Offeree Holders. Within fifteen (15) days after delivery of

                                      -19-
<PAGE>   20
that Notice, each Offeree Holder may elect to sell up to such person's pro rata
share (as defined herein) of the remaining shares to be purchased by the
transferee described in the Transfer Notice by giving written notice thereof to
the Significant Holder and tendering to the Secretary of the Company a
certificate representing the shares to be sold, properly endorsed for transfer,
with written instructions to transfer the shares to the transferee described in
the Transfer Notice upon receipt of payment for such shares from such
transferee for the benefit of such Offeree Holder. The Selling Shareholder
shall thereupon notify the transferee of the co-sale arrangements hereunder,
and instruct the transferee to deliver payment for the shares to be purchased
by such transferee to the Secretary of the Company, who shall transmit such
payment to the Significant Holder, Series A Holder, Series B Holder and
Purchaser in payment for the shares sold by each. For the purpose of the rights
set forth in this Section 8(b), the "PRO RATA SHARE" of an Offeree Holder shall
be equal to the quotient obtained when the aggregate number of shares of Common
Stock issued or issuable upon conversion of the Preferred Stock held by such
Offeree Holder and upon exercise of the Warrants held by such Offeree Holder is
divided by the number of shares of Significant Holders' Stock held by the
Selling Shareholder at the date of the Transfer Notice plus all Conversion
Stock.

     (c) SALE AFTER NOTICE. To the extent the Series A Holders, Series B
Holders, Purchasers or Warrant Holders decline to exercise both the right of
first refusal and the co-sale right as allowed by this Section, the Selling
Shareholder may, within ninety (90) days after the date on which the Series A
Holders', Series B Holders', Purchasers' or Warrant Holders' co-sale rights
lapsed, transfer some or all of the Significant Holders' Stock which were the
subject of the Transfer Notice at a price and on terms no less favorable to the
transferees than specified in the Transfer Notice. Significant Holders' Stock
transferred in accordance with the provisions of this Section 8 shall no
longer be subject to the restrictions on Significant Holders' Stock set forth
in this Section 8. After the expiration of said ninety (90) day period, the
Selling Shareholder shall not transfer any of his Significant Holders' Stock
without first offering such securities to the Series A Holders, Series B
Holders, Purchasers and Warrant Holders in the manner provided above.

     (d) EXEMPT TRANSFERS. Any transfer of Significant Holders' Stock without
consideration to a family member of the Significant Holder or a trust or
custodian for the benefit of the Significant Holder or a family member of the
Significant Holder shall not be subject to the provisions of this Section 8,
provided that the transferee agrees in writing to be bound by the provisions of
this Section 8 with respect to any subsequent transfer of such shares.

     (e) TRANSFERABILITY. The rights granted under this Section 8 may not be
assigned except for (i) a transaction involving the distribution without
consideration of shares of Common Stock held by a Purchaser, Series A Holder,
Series B Holder or Warrant Holder to such holder's constituent partners or
members in proportion to their ownership interests in such holder or (ii) in
connection with a transfer of Registrable Securities by the holder whereby such
transferee acquires at least 100,000 shares (as adjusted for stock splits,
stock dividends, stock combinations and the like) of Registrable Securities
(including Preferred Stock convertible into Registrable Securities or Warrant
Stock exercisable for Registrable Securities).

                                      -20-

<PAGE>   21
          (f)  Termination.  The rights of the Purchasers, Series A Holders,
Series B Holders or Warrant Holders pursuant to this Section 8 shall not apply
to any offering of stock made pursuant to a registration statement and shall
terminate and be of no further force or effect upon the closing of the Company's
initial public offering of its Common Stock pursuant to a registration statement
declared effective by the Commission.

          (g)  Restrictive Legend.  Each certificate representing the stock
subject to this co-sale restriction shall be stamped or otherwise imprinted with
a legend in substantially the following form (in addition to any legends
required by agreement or by applicable state securities laws):

          TRANSFER OF THE SHARES REPRESENTED BY THIS CERTIFICATE IS SUBJECT TO
          CERTAIN RIGHTS OF FIRST REFUSAL AND CO-SALE PROVISIONS SET FORTH IN
          AN AGREEMENT BETWEEN THE HOLDER, THE ISSUER, AND CERTAIN OTHER
          HOLDERS OF STOCK OF THE ISSUER, A COPY OF WHICH MAY BE OBTAINED AT
          THE PRINCIPAL OFFICE OF THE ISSUER.

     9.   AMENDMENT.  Except as otherwise provided above, any provision of this
Agreement may be amended or the observance thereof may be waived (either
generally or in a particular instance and either retroactively or
prospectively), only with the written consent of the Company and the Holders of
a majority of the Registrable Securities then outstanding. Notwithstanding the
foregoing, no amendment shall be made to this Agreement which by its terms
adversely affects, or which was motivated primarily by an intent to adversely
affect, a particular class of Holders (e.g., Series A Holders, Series B Holders,
Purchasers or Warrant Holders) in a manner differently from the other Holders
without the written consent of a majority of the Registrable Securities held by
the Holders in such adversely affected class. Any amendment or waiver effected
in accordance with Section 5.4 or Section 9, as applicable, shall be binding
upon each Series A Holder, Series B Holder, Purchaser, Warrant Holder,
Significant Holder or Holder of Registrable Securities at the time outstanding,
each future holder of any of such securities, and the Company.

     10.  GOVERNING LAW.  This Agreement shall be governed in all respects by
the internal laws of the State of Nevada without regard to conflict of laws
provisions.

     11.  ENTIRE AGREEMENT. This Agreement constitutes the full and entire
understanding and Agreement among the parties regarding the matters set forth
herein. Except as otherwise expressly provided herein, the provisions hereof
shall inure to the benefit of, and be binding upon the successors, assigns,
heirs, executors and administrators of the parties hereto.

     12.  NOTICES, ETC. All notices and other communications required or
permitted hereunder shall be in writing and shall be mailed by registered or
certified mail, postage prepaid, or otherwise delivered by facsimile
transmission, by hand or by messenger, addressed:

                                      -21-

<PAGE>   22
        (a) if to a Holder, at such Holder's address as set forth in Exhibit A,
or at such other address as such Holder shall have furnished to the Company.

        (b) if to the Company, to:

            Quality Care Solutions, Inc.
            5030 East Sunrise Drive
            Phoenix, Arizona 85044
            Attn: Robert F. Theilmann
            Fax:  (602) 940-1388

or at such other address as the Company shall have furnished to the Holders,
with a copy to:

            Bryan Cave LLP
            2800 North Central Avenue, 21st Floor
            Phoenix, Arizona 85004-1098
            Attn: Joseph P. Richardson
            Fax:  (602) 266-5938

        Each such notice or other communication shall for all purposes of this
Agreement be treated as effective or having been given when delivered if
delivered personally, if sent by facsimile, the first business day after the
date of confirmation that the facsimile has been successfully transmitted to the
facsimile number for the party notified, or, if sent by mail, at the earlier of
its receipt or 72 hours after the same has been deposited in a regularly
maintained receptacle for the deposit of the United States mail, addressed and
mailed as aforesaid.

    13. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

                                      -22-

<PAGE>   23
IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
date first set forth above.

"THE COMPANY"

Quality Care Solutions, Inc.
a Nevada corporation

By: /s/ Gregory S. Anderson
    ------------------------------
    Gregory S. Anderson, President

"THE SIGNIFICANT HOLDERS"

/s/ J. Mikel Echeverria
----------------------------------
J. Mikel Echeverria

/s/ Sherwood Chapman
----------------------------------
Sherwood Chapman

/s/ Alan B. Oliver
----------------------------------
Alan B. Oliver

/s/ Bruss Bowman
----------------------------------
Bruss Bowman

/s/ Robert F. Theilmann
----------------------------------
Robert F. Theilmann

          [Counterpart Signature page to Quality Care Solutions, Inc.
                         Shareholder Rights Agreement]

<PAGE>   24
"THE SERIES A HOLDERS"

Name of Purchaser (print):

__________________________________

By:    ___________________________

Title: ___________________________

Date:  ___________________________

"THE SERIES B HOLDERS"

Name of Purchaser (print):

__________________________________

By:    ___________________________

Title: ___________________________

Date:  ___________________________

"THE PURCHASERS"

DOMINION FUND IV, A DELAWARE LIMITED PARTNERSHIP
by its general partner, DOMINION MANAGEMENT IV, L.L.C.

/s/ Brian Smith
__________________________________

By:    Brian Smith

Title: Member

Date:  May 29, 1998

          [Counterpart Signature page to Quality Care Solutions, Inc.
                         Shareholder Rights Agreement]

<PAGE>   25
                                   EXHIBIT A

                          (to the Amended and Restated
                 Registration and Information Rights Agreement
                              dated May 29, 1998)

                              SCHEDULE OF HOLDERS

"THE SIGNIFICANT HOLDERS"                                 SHARES OF COMMON STOCK

J. Mikel Echeverria                                             3,860,000
14440 S. 13th Place
Phoenix, AZ 85048

Sherwood Chapman                                                1,758,850
610 E. Betsy Ln
Gilbert, AZ

Alan B. Oliver                                                    768,600
11010 East Warner #130
Tempe, AZ 85283

Bruss Bowman                                                      768,600
995 E. Baseline, #2012
Tempe, AZ 85283

Robert F. Theilmann                                               108,333
6506 S. Jentilly
Tempe, AZ 85283
<PAGE>   26
                                   EXHIBIT A

                              SCHEDULE OF HOLDERS

"THE SERIES B HOLDERS"                                        SHARES OF SERIES B
                                                               PREFERRED STOCK

                                      -ii-

<PAGE>   27
                                   EXHIBIT A

                              SCHEDULE OF HOLDERS

"THE PURCHASERS"                                             SHARES OF SERIES C
                                                               PREFERRED STOCK

Dominion Fund IV, a Delaware Limited                              5,194,805
Partnership
44 Montgomery Street, Suite 4200
San Francisco, CA 94104

                                     -iii-

<PAGE>   28
                                   EXHIBIT A

                              SCHEDULE OF HOLDERS

"THE WARRANT HOLDERS"                             WARRANTS TO PURCHASE SHARES OF
                                                           COMMON STOCK

Gregory S. Anderson                                           40,000
4715 E. Calle Del Hoeto
Phoenix, AZ 85018

Robert F. Theilmann                                           60,000
6506 S. Jentilly
Tempe, AZ 85283

                                      -iv-

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}]]