Execution Copy
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                            Stock Purchase Agreement

                           dated as of August 5, 1997

                                     between

                     Aetna Insurance Company of Connecticut

                                       and

                         Magellan Health Services, Inc.

















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                                Table of Contents

                                                                            Page

Introduction...................................................................1

                                    ARTICLE I

                                   Definitions

1.1. Definitions...............................................................1
1.2. Defined Terms.............................................................3

                                   ARTICLE II

                                 Closing Matters

2.1. Closing Payment...........................................................4
2.2. Closing...................................................................4
2.3. Closing Balance Sheet.....................................................5
2.4. Adjustment of Closing Payment.............................................6

                                   ARTICLE III

                    Representations and Warranties of Seller

3.1. Corporate Existence and Power.............................................7
3.2. Corporate Authorization...................................................7
3.3. Governmental Authorization; Consents......................................7
3.4. Non-Contravention.........................................................8
3.5. Capitalization............................................................8
3.6. Subsidiaries..............................................................8
3.7. Financial Statements......................................................9
3.8. Properties................................................................9
3.9. No Undisclosed Material Liabilities......................................10
3.10. Litigation..............................................................10
3.11. Material Contracts......................................................10
3.12. Compliance with Laws....................................................12
3.13. Brokers' Fees...........................................................12
3.14. Intellectual Property...................................................12
3.15. Permits and Licenses....................................................12
3.16. Labor Matters...........................................................12
3.17. Insurance Policies......................................................13
3.18. Absence of Certain Commercial Practices.................................13
3.19. Assets..................................................................13
3.20. No Adverse Changes......................................................14
3.21. Disclosure..............................................................14









                                   ARTICLE IV

                   Representations And Warranties Of Purchaser

4.1. Organization and Existence...............................................14
4.2. Corporate Authorization..................................................14
4.3. Governmental Authorization; Consents.....................................15
4.4. Non-Contravention........................................................15
4.5. Brokers' Fees............................................................15
4.6. Financing................................................................15
4.7. Purchase for Investment..................................................15
4.8. Litigation...............................................................15
4.9. Inspections..............................................................16

                                    ARTICLE V

                               Covenants Of Seller

5.1. Conduct of the Company...................................................16
5.2. Access to Information; Disclosure Supplements............................18
5.3. Notices of Certain Events................................................19
5.4. Resignations.............................................................19
5.5. No Shop..................................................................19
5.6. Contributed Assets.......................................................19

                                   ARTICLE VI

                             Covenants Of Purchaser

6.1. Confidentiality..........................................................20
6.2. Access...................................................................20
6.3.  Insurance...............................................................20
6.4. Use of Names.............................................................20
6.5. Headquarters Lease.......................................................21
6.6. Retention Arrangements...................................................21

                                   ARTICLE VII

                            Covenants Of Both Parties

7.1. Reasonable Efforts.......................................................21
7.2. Certain Filings..........................................................21
7.3. Public Announcements.....................................................21
7.4. Related Agreements.......................................................22
7.5. Home Office Lease........................................................22
7.6. Co-Located Space.........................................................22
7.7. Transition Services Standard.............................................22

                                       ii






                                  ARTICLE VIII

                                   Tax Matters

8.1. Tax Definitions..........................................................22
8.2. Tax Representations......................................................23
8.3. Elections................................................................24
8.4. Termination of Existing Tax Sharing Agreements...........................25
8.5. Tax Returns..............................................................25
8.6. Other Tax Matters........................................................26
8.7. Cooperation on Tax Matters...............................................26
8.8. Certain Disputes.........................................................26
8.9. Tax Indemnification......................................................27

                                   ARTICLE IX

                                Employee Benefits

9.1. Employee Benefits Definitions............................................29
9.2. ERISA Representations....................................................29
9.3. Employees................................................................31
9.4. Pension Plan.............................................................31
9.5. Individual Account Plan..................................................31
9.6. Other Employee Plans and Benefit Arrangements............................31
9.7. Plans Following the Closing..............................................32
9.8. Medical and Dental Insurance Coverage....................................33
9.9. Assumption of Liabilities................................................33
9.10. Third Party Beneficiaries...............................................34

                                    ARTICLE X

                              Conditions To Closing

10.1. Conditions to Obligations of Each Party.................................34
10.2. Conditions to Obligation of Purchaser...................................34
10.3. Conditions to Obligation of Seller......................................36

                                   ARTICLE XI

                            Survival; Indemnification

11.1. Survival................................................................37
11.2. Indemnification.........................................................37
11.3. Procedures; Exclusivity.................................................39
11.4. Investigation...........................................................39



                                       iii






                                   ARTICLE XII

                                   Termination

12.1. Grounds for Termination.................................................39
12.2. Effect of Termination...................................................40

                                  ARTICLE XIII

                                  Miscellaneous

13.1. Notices.................................................................40
13.2. Amendments; No Waivers..................................................41
13.3. Expenses................................................................41
13.4. Successors and Assigns..................................................41
13.5. Governing Law...........................................................41
13.6. Submission to Jurisdiction..............................................41
13.7. Waiver of Jury Trial....................................................42
13.8. Specific Performance....................................................42
13.9. Counterparts; Effectiveness.............................................42
13.10. Entire Agreement.......................................................42
13.11. Severability...........................................................42
13.12. Captions; Construction.................................................42
13.13. Third Party Beneficiaries..............................................42
13.14. No Set-off.............................................................42


                                    Exhibits

Exhibit A                  Form of Guaranty of Aetna U.S. Healthcare Inc.
Exhibit B                  Form of Master Agreement
Exhibit C                  Form of Transition Services Agreement
Exhibit D                  Form of Non-Competition Covenant















                                       iv







          Stock   Purchase   Agreement,   dated  as  of   August  5,  1997  (the
"Agreement"),  between Aetna  Insurance  Company of  Connecticut,  a Connecticut
insurance corporation ("Seller"), and Magellan Health Services, Inc., a Delaware
corporation ("Purchaser").

                                  Introduction

             Seller is the  owner of  10,000  shares  (the  "Shares")  of common
stock,  no par value  (the  "Common  Stock"),  of Human  Affairs  International,
Incorporated, a Utah corporation (the "Company"), constituting all of the issued
and outstanding capital stock of the Company;

             Purchaser  desires to  purchase  the Shares from  Seller,  and
Seller  desires to sell the Shares to  Purchaser,  upon the terms and subject to
the conditions set forth in this Agreement;

             In  consideration  of the  foregoing and the  representations,  
warranties, covenants,  agreements and conditions  contained in this Agreement,
the parties agree as follows:

                                    ARTICLE I

                                   Definitions

1.1. Definitions.  (a) The following  terms, as used herein,  have the following
     meanings:

     "Affiliate"  means,  with  respect to any  Person,  any Person  directly or
indirectly  controlling,  controlled by, or under common control with such other
Person; provided that neither the Company nor any Subsidiary shall be considered
an Affiliate of Seller.

     "Balance Sheet" means the consolidated balance sheet of the Company and its
consolidated Subsidiaries as of June 30, 1997 referred to in Section 3.7.

     "Balance Sheet Date" means June 30, 1997.

     "Base Stockholder's Equity" means $15,500,000.00.

     "Closing  Balance Sheet" means a consolidated  balance sheet of the Company
and  its  consolidated  Subsidiaries  as at the  close  of  business  on the day
immediately preceding the Closing Date, together with the notes thereto.

     "Closing Date" means the date of the Closing.

     "Closing Stockholder's Equity" means the consolidated  stockholder's equity
of the Company and its consolidated  Subsidiaries as of the close of business on
the day  immediately  preceding  the  Closing  Date as set forth on the  Closing
Balance Sheet.

     "Disclosure  Schedule" means the disclosure schedule delivered by Seller to
Purchaser simultaneously with the execution of this Agreement.

     "Final  Stockholder's  Equity"  means Closing  Stockholder's  Equity (i) as
shown in Seller's






calculation  delivered  pursuant to Section 2.3(a) if no notice of  disagreement
with respect  thereto is duly  delivered  pursuant to Section  2.3(b) or (ii) if
such a notice of disagreement  is duly  delivered,  (A) as agreed by the parties
pursuant to Section 2.3(c) or (B) in the absence of such agreement,  as shown in
the independent  accountant's  calculation delivered pursuant to Section 2.3(c);
provided  that Final  Stockholder's  Equity  shall not in any event be more than
Seller's  calculation  of Closing  Stockholder's  Equity  delivered  pursuant to
Section 2.3(a) nor less than  Purchaser's  calculation of Closing  Stockholder's
Equity delivered pursuant to Section 2.3(b).

     "HSR Act" means the Hart-Scott-Rodino Antitrust Improvements Act of 1976.

     "Intellectual   Property   Right"  means  any   trademark,   service  mark,
registration  thereof or  application  for  registration  therefor,  trade name,
invention,  patent,  patent  application,  trade  secret,  know-how,  copyright,
copyright  registration,  application for copyright  registration,  or any other
similar type of proprietary intellectual property right.

     "knowledge  of  Seller"  means the  actual  knowledge,  on the date of this
Agreement,  if any, of any of the officers,  directors or employees of Seller or
the Company set forth in Section 1.1 of the Disclosure Schedule.

     "Lien"  means,  with  respect  to any asset  (including  the  Shares),  any
mortgage,  lien,  pledge,  charge,  security  interest,  option,  restriction on
transfer or other encumbrance of any kind in respect of such asset.

     "Person" means an  individual,  a  corporation,  a  partnership,  a limited
liability  company,  an  association,  a trust or other entity or  organization,
including a government or political  subdivision or an agency or instrumentality
thereof.

     "Purchaser  Disclosure Schedule" means the disclosure schedule delivered by
Purchaser to Seller simultaneously with the execution of this Agreement.

     "Subsidiary"  means  any  entity  of which  securities  or other  ownership
interests  having  ordinary  voting  power to elect a  majority  of the board of
directors or other persons  performing  similar  functions are owned directly or
indirectly by the Company.

     (b)  Each of the  following  terms is  defined  in the  Section  set  forth
          opposite such term:


     Term                                                       Section
     ----                                                       ------- 
     Accounting Referee                                         8.8
     Benefit Arrangement                                        9.1
     Closing                                                    2.2
     Closing Payment                                            2.1
     Code                                                       8.1
     Combined State Tax                                         8.1
     Common Stock                                               Introduction
     Company                                                    Introduction
     Company Securities                                         3.5
     Contracts                                                  3.11


                                        2






     Contributed Assets                                         3.19
     Customer Contracts                                         3.11
     Damages                                                    11.2
     De Minimis Claims                                          11.2
     Direct Rollover                                            9.5
     Employee Plans                                             9.2
     ERISA                                                      9.1
     ERISA Affiliate                                            9.1
     Federal Taxes                                              8.1
     Guarantor                                                  10.2(g)
     Indemnified Party                                          11.2
     Indemnifying Party                                         11.2
     Individual Account Plan                                    9.1
     Headquarters Lease                                         6.5
     Licenses                                                   3.15
     Master Agreement                                           10.2(g)
     Multiemployer Plan                                         9.1
     PBGC                                                       9.1
     Pension Plan                                               9.1
     Post-Closing Tax Period                                    8.1
     Pre-Closing Tax Period                                     8.1
     Purchaser Plan                                             9.5
     Purchaser Indemnified Parties                              11.2
     Related Transaction Agreements                             7.4
     Retention Arrangements                                     6.6
     Returns                                                    8.2
     Seller Indemnified Parties                                 11.2
     Shares                                                     Introduction
     Subsidiary Securities                                      3.6
     Tax                                                        8.1
     Tax Indemnification Period                                 8.1
     Tax Sharing Agreement                                      8.1
     Title IV Plan                                              9.1
     Transferred Employees                                      9.3
     Transition Services Agreement                              10.2(i)

     1.2.  Defined  Terms.  (a) All  references in this Agreement to "Articles",
"Sections" and other subdivisions are to the designated  Articles,  Sections and
other  subdivisions  of  this  Agreement.  The  words  "herein",   "hereof"  and
"hereunder" and other words of similar import refer to this Agreement and not to
any particular Article, Section or other subdivision.

     (b) In  this  Agreement  in the  computation  of  periods  of  time  from a
specified  date to a later  specified  date,  the word  "from"  means  "from and
including" and the words "to" and "until" each mean "to but excluding".

     (c) A reference  to  "including"  in this  Agreement  shall mean  including
without limitation.

                                        3





     (d) A reference to a Person in this  Agreement  includes its successors and
permitted assigns (if any).

     (e) A reference  to any  agreement or contract in this  Agreement  includes
permitted amendments and supplements.

     (f) A  reference  to a law in this  Agreement  includes  any  amendment  or
modification to such law and any rules or regulations issued thereunder.

                                   ARTICLE II

                                 Closing Matters

     2.1 Closing  Payment.  Upon the terms and subject to the conditions of this
Agreement,  Seller agrees to sell to Purchaser, and Purchaser agrees to purchase
from Seller,  the Shares at the Closing free and clear of any and all Liens. The
consideration  payable at Closing  for the Shares  (the  "Closing  Payment")  is
$122,100,000 in cash, subject to adjustment as provided in Section 2.4.

     2.2 Closing.  The  consummation  of the  transactions  contemplated by this
Agreement (the "Closing") shall take place five business days following the date
on which all  conditions to Closing have been satisfied or waived at 10:00 a.m.,
at the offices of Howard, Darby & Levin, 1330 Avenue of the Americas,  New York,
New York,  or at such other time or at such other place as Purchaser  and Seller
may agree. At the Closing,

     (a)  Purchaser shall deliver to Seller:

     (i) the Closing Payment, by wire transfer of immediately available funds to
such  account as Seller may direct by written  notice  delivered to Purchaser by
Seller at least two business days prior to the Closing Date; and

     (ii) such other documents and certificates duly executed as may be required
to be delivered by Purchaser pursuant to the terms of this Agreement  (including
Section 10.3).

     (b) Seller shall deliver to Purchaser:

     (i)  certificates  for the Shares  duly  endorsed or  accompanied  by stock
powers  duly  endorsed  in blank,  with any  required  transfer  stamps  affixed
thereto; and

     (ii) such other documents and certificates duly executed as may be required
to be delivered  by Seller  pursuant to the terms of this  Agreement  (including
Section 10.2).

     2.3 Closing  Balance Sheet.  (a) (i) As promptly as  practicable  after the
Closing  Date,  Seller will cause the Closing  Balance  Sheet to be prepared and
will prepare a certificate based on such

                                        4





Closing  Balance Sheet setting forth its  calculation  of Closing  Stockholder's
Equity. As promptly as practicable, but no later than 90 days, after the Closing
Date,  Seller will cause the Closing Balance Sheet together with its certificate
to be delivered to Purchaser.  Except as otherwise  provided in subsection  (ii)
below,  the  Closing  Balance  Sheet  shall (x) fairly  present in all  material
respects the consolidated financial position of the Company and its consolidated
Subsidiaries  as at the close of business on the day  immediately  preceding the
Closing Date in accordance with generally accepted accounting principles applied
on a basis  consistent  with those used in the  preparation of the Balance Sheet
(including  those  matters   discussed  in  Section  3.7(b)  of  the  Disclosure
Schedule), subject to normal, historically consistent year-end adjustments, none
of which  will be  material  in nature,  (y)  include  line items  substantially
consistent  with those in the Balance  Sheet and (z) be  prepared in  accordance
with accounting  policies and practices applied on a basis consistent with those
used in the preparation of the Balance Sheet.

     (ii)  Prior to the date of the  Closing  Balance  Sheet,  Seller  shall (i)
determine  the amount of all federal  and state  income  taxes (or a  reasonable
estimate  thereof) which (but for the last sentence of this paragraph)  would be
accrued as a current or deferred liability under generally  accepted  accounting
principles  ("Closing Accrued Tax Liabilities") on the Closing Balance Sheet and
(ii)  determine the amount (or reasonable  estimate  thereof) of all federal and
state current or deferred income tax assets ("Closing Accrued Tax Assets") which
would be recorded as an asset under generally accepted accounting  principles on
the  Closing  Balance  Sheet.  Prior to the date of the Closing  Balance  Sheet,
Seller  shall  assume all the Closing  Accrued Tax  Liabilities  and cause to be
transferred  to Seller (by dividend or otherwise)  the amount of all the Closing
Accrued  Tax Assets;  it being  understood  and agreed that the Closing  Balance
Sheet shall not contain any balances relating to any state or federal income tax
current or deferred assets or liabilities.

     If the Closing  Accrued  Tax  Liabilities  exceed the  Closing  Accrued Tax
Assets,  the difference shall be referred to as the "Net Accrued Tax Liability";
if the Closing  Accrued Tax Assets exceed the Closing  Accrued Tax  Liabilities,
the  difference  shall be  referred to as the "Net  Accrued Tax  Assets." In the
event the above determination  results in Net Accrued Tax Liability,  the Seller
shall be entitled to cause the Company, prior to the date of the Closing Balance
Sheet,  to dividend  cash to the Seller (or transfer to the Seller by adjustment
of  intercompany  accounts) in the amount of Net Accrued Tax  Liability.  In the
event the above  determination  results in Net Accrued  Tax  Assets,  the Seller
shall contribute to the Company, prior to the date of the Closing Balance Sheet,
cash (or  transfer to the Company by  adjusting  intercompany  accounts)  in the
amount of Net Accrued Tax Assets.

     (b)  If  Purchaser   disagrees   with  Seller's   calculation   of  Closing
Stockholder's Equity delivered pursuant to Section 2.3(a), Purchaser may, within
30 days after delivery of the documents referred to in Section 2.3(a), deliver a
notice to Seller disagreeing with such calculation and setting forth Purchaser's
calculation of such amount.  Any such notice of disagreement shall specify those
items or amounts as to which Purchaser disagrees,  and Purchaser shall be deemed
to have agreed with all other items and amounts contained in the Closing Balance
Sheet and the calculation of Closing  Stockholder's Equity delivered pursuant to
Section 2.3(a).

     (c) If a notice of disagreement shall be duly delivered pursuant to Section
2.3(b), the parties shall, during the 15 days following such delivery, use their
best efforts to reach  agreement  on the  disputed  items or amounts in order to
determine, as may be required, the amount of Closing Stockholder's Equity, which
amount shall not be more than the amount thereof shown in Seller's

                                        5





calculation  delivered  pursuant  to  Section  2.3(a)  nor less than the  amount
thereof shown in Purchaser's  calculation  delivered pursuant to Section 2.3(b).
If,  during such period,  the parties are unable to reach such  agreement,  they
shall promptly  thereafter  cause an independent  accounting  firm of nationally
recognized standing  reasonably  satisfactory to Seller and Purchaser (who shall
not have any material relationship with Seller or Purchaser), promptly to review
this  Agreement and the disputed items or amounts for the purpose of calculating
Closing  Stockholder's  Equity.  In making such  calculation,  such  independent
accountants  shall  consider only those items or amounts in the Closing  Balance
Sheet or  Seller's  calculation  of  Closing  Stockholder's  Equity  as to which
Purchaser has disagreed.  Such independent  accountants  shall deliver to Seller
and  Purchaser,  as  promptly  as  practicable,  a  report  setting  forth  such
calculation. Such report shall be final and binding upon the parties hereto. The
cost of such  review and report  shall be borne (i) by Seller if the  difference
between Final Stockholder's Equity and Closing Stockholder's Equity as set forth
in Seller's  calculation of Closing  Stockholder's  Equity delivered pursuant to
Section 2.3(a) is greater than the difference between Final Stockholder's Equity
and Closing  Stockholder's  Equity as set forth in  Purchaser's  calculation  of
Closing  Stockholder's  Equity  delivered  pursuant to Section  2.3(b),  (ii) by
Purchaser if the first such  difference is less than the second such  difference
and (iii) otherwise equally by Seller and Purchaser.

     (d)The  parties  hereto  agree  that they  will,  and agree to cause  their
respective  independent  accountants and the Company to, cooperate and assist in
the  preparation  of the Closing  Balance Sheet and the  calculation  of Closing
Stockholder's  Equity and in the  conduct of the review  referred  to in Section
2.3(c),  including  without  limitation  the  making  available  to  the  extent
necessary of books, records, work papers and personnel.

     2.4 Adjustment of Closing Payment. (a) If Base Stockholder's Equity exceeds
Final Stockholder's Equity by at least $500,000,  Seller shall pay to Purchaser,
as an  adjustment  to the Closing  Payment,  in the manner and with  interest as
provided  in  Section  2.4(b),  the amount by which  Base  Stockholder's  Equity
exceeds Final Stockholder's  Equity. If Final Stockholder's  Equity exceeds Base
Stockholder's Equity by at least $500,000, Purchaser shall pay to Seller, in the
manner and with  interest  as provided  in Section  2.4(b),  the amount by which
Final Stockholder's  Equity exceeds Base Stockholder's  Equity. Any such payment
pursuant to this Section 2.4(a) shall be made at a mutually  convenient time and
place (i) within 40 days after Seller's delivery of the documents referred to in
Section   2.3(a)  if  no  notice  of   disagreement   with  respect  to  Closing
Stockholder's  Equity is duly delivered  pursuant to Section 2.3(b) or (ii) if a
notice of  disagreement  with  respect to Closing  Stockholder's  Equity is duly
delivered  pursuant  to Section  2.3(b) then within 10 days after the earlier of
(A)  agreement  between the parties  pursuant to Section  2.3(c) with respect to
Closing  Stockholder's  Equity and (B)  delivery of the  calculation  of Closing
Stockholder's Equity referred to in Section 2.3(c).

     (b) Method of Payment.  Any payments  pursuant to this Section 2.4 shall be
made by wire  transfer of  immediately  available  funds to such  account as the
payee may direct by written notice  delivered to the payor by the payee at least
two business days prior to the date of such  payment.  The amount of any payment
to be made  pursuant to this Section 2.4 shall bear  interest from and including
the Closing Date to but  excluding the date of payment at a rate per annum equal
to the rate publicly  announced from time to time by The Chase Manhattan Bank in
New York City as its prime  rate in effect  from time to time  during the period
from the Closing Date to the date of payment.  Such interest shall be payable at
the same time as the payment to which it relates and shall be  calculated  daily
on the

                                        6





basis of a year of 365 days and the actual number of days for which due.

                                   ARTICLE III

                    Representations and Warranties of Seller

     Seller hereby represents and warrants to Purchaser that:

     3.1  Corporate  Existence  and Power.  Each of Seller and the  Company is a
corporation duly  incorporated,  validly existing and in good standing under the
laws of its jurisdiction of incorporation, and has all requisite corporate power
and  authority to carry on its business as now being  conducted.  The Company is
duly qualified to do business as a foreign  corporation  and is in good standing
in each  jurisdiction  where the character of the property owned or leased by it
or the nature of its activities make such  qualification  necessary.  Seller has
heretofore delivered to Purchaser true and complete copies of the certificate of
incorporation and bylaws of Seller and the Company as currently in effect.

     3.2 Corporate  Authorization.  The execution,  delivery and  performance by
Seller of this  Agreement  and the  consummation  by Seller of the  transactions
contemplated  hereby are  within  Seller's  corporate  powers and have been duly
authorized  by all  necessary  corporate  action on the part of  Seller  and the
shareholder of Seller. This Agreement constitutes a valid and binding obligation
of Seller,  enforceable against Seller in accordance with its terms,  subject to
(i) bankruptcy, insolvency, fraudulent transfer, moratorium,  reorganization and
other  similar laws  affecting  creditors'  rights  generally  and the rights of
creditors of insurance companies generally and (ii) general principles of equity
(regardless of whether considered in a proceeding at law or in equity).

     3.3  Governmental  Authorization;  Consents.  (a)  Except  as set  forth in
Section 3.3(a) of the Disclosure Schedule and except for applicable requirements
of the HSR Act,  neither the execution and delivery of this Agreement by Seller,
nor the  consummation  by Seller of the  transactions  contemplated  hereby will
require any action by or in respect of, or filing with, any  governmental  body,
agency, official or authority (other than actions or filings that are immaterial
to Purchaser,  the Company and the  Subsidiaries,  and the  consummation  of the
transactions contemplated hereby).

     (b) Except as set forth in Section  3.3(b) of the Disclosure  Schedule,  no
consent,  approval,  waiver  or  other  action  by any  Person  (other  than any
governmental body, agency, official or authority referred to in (a) above) under
any contract,  agreement,  indenture, lease, instrument or other document listed
in Section  3.11(a) of the Disclosure  Schedule is required or necessary for the
execution,  delivery  and  performance  of  this  Agreement  by  Seller  or  the
consummation of the transactions contemplated hereby.

     3.4 Non-Contravention. Except as set forth in Section 3.4 of the Disclosure
Schedule, the execution, delivery and performance by Seller of this Agreement do
not  and  will  not  (i)   contravene  or  conflict  with  the   certificate  of
incorporation or bylaws of Seller, the Company or any Subsidiary,  (ii) assuming
compliance  with the  matters  referred  to in  Section  3.3(a),  contravene  or
conflict in any material  respect with or constitute a violation in any material
respect of any provision of any law, regulation,  judgment, injunction, order or
decree binding upon or applicable to Seller, the Company or

                                        7





any Subsidiary;  (iii)  constitute a default under, or give rise to any right of
termination,  cancellation or acceleration of any right or obligation of Seller,
the  Company  or any  Subsidiary  under,  or to a loss of any  benefit  to which
Seller,  the Company or any Subsidiary is entitled  under,  any provision of any
material  agreement,  contract or other material instrument binding upon Seller,
the Company or any  Subsidiary  or any material  license,  franchise,  permit or
other  similar  material  authorization  held  by  Seller,  the  Company  or any
Subsidiary  or (iv)  result in the  creation  or  imposition  of any Lien on any
material asset of Seller, the Company or any Subsidiary.

     3.5 Capitalization. The authorized capital stock of the Company consists of
50,000  shares of Common  Stock.  As of the date hereof,  there are  outstanding
10,000 shares of Common Stock.  All  outstanding  shares of capital stock of the
Company are duly  authorized,  validly  issued,  fully paid and  non-assessable.
Except as set forth in this  Section,  there are no  outstanding  (i)  shares of
capital stock or other voting securities of the Company,  (ii) securities of the
Company  convertible  into or exchangeable for shares of capital stock or voting
securities  of the Company or (iii)  options or other rights to acquire from the
Company,  and there is no obligation of the Company to issue, any capital stock,
voting  securities or securities  convertible  into or exchangeable  for capital
stock or voting  securities  of the Company (the items in clauses (i),  (ii) and
(iii) being referred to collectively as the "Company Securities").  There are no
outstanding  obligations of the Company or any Subsidiary to issue or deliver or
to repurchase, redeem or otherwise acquire any Company Securities. Seller is and
will be at the Closing the record and beneficial  owner of the Shares,  free and
clear of any Lien whatsoever,  and will transfer and deliver to Purchaser at the
Closing  valid  title to the  Shares  free and clear of any  Lien.  There are no
stockholder  agreements,  voting  agreements,  voting  trusts,  proxies or other
agreements in effect with respect to the voting or transfer of the Common Stock.

     3.6 Subsidiaries.  (a) Each Subsidiary is a corporation duly  incorporated,
validly  existing and in good  standing  under the laws of its  jurisdiction  of
incorporation,  has all requisite  corporate power and authority to carry on its
business  as now  conducted  and is duly  qualified  to do business as a foreign
corporation and is in good standing in each jurisdiction  where the character of
the  property  owned or leased by it or the nature of its  activities  make such
qualification  necessary. All Subsidiaries and their respective jurisdictions of
incorporation  are  identified  in Section  3.6(a) of the  Disclosure  Schedule.
Seller has  heretofore  delivered to Purchaser  true and complete  copies of the
certificate  of  incorporation  and bylaws of each  Subsidiary  as  currently in
effect.

     (b) Except as set forth in Section 3.6(b) of the Disclosure  Schedule,  all
of the  outstanding  capital  stock of, or other  ownership  interests  in, each
Subsidiary,  is owned,  of record and  beneficially,  by the  Company or another
Subsidiary,  free and  clear of any Lien  and free of any  other  limitation  or
restriction  (including any  restriction on the right to vote, sell or otherwise
dispose  of such  capital  stock or other  ownership  interests).  There  are no
outstanding (i) securities of the Company or any Subsidiary  convertible into or
exchangeable for shares of capital stock or other voting securities or ownership
interests in any  Subsidiary or (ii) options or other rights to acquire from the
Company or any  Subsidiary,  and there is no  obligation  of the  Company or any
Subsidiary,  to issue, any capital stock,  voting  securities or other ownership
interests in, or any securities convertible into or exchangeable for any capital
stock, voting securities or ownership interests in, any Subsidiary (the items in
clauses  (i)  and  (ii)  being  referred  to  collectively  as  the  "Subsidiary
Securities").  There  are  no  outstanding  obligations  of the  Company  or any
Subsidiary to repurchase, redeem or otherwise acquire any outstanding

                                        8





Subsidiary Securities.

     (c)  Other  than the  Subsidiaries  identified  in  Section  3.6(a)  of the
Disclosure  Schedule,  there are no other  corporations,  partnerships,  limited
liability  companies,  joint  ventures or other entities in which the Company or
any Subsidiary  owns, of record or  beneficially,  any direct or indirect equity
interest or any right  (contingent or otherwise) to acquire the same.  There are
no stockholder  agreements,  voting agreements,  voting trusts, proxies or other
agreements in effect with respect to the voting or transfer of the capital stock
of any Subsidiary.

     3.7 Financial  Statements.  The audited  consolidated balance sheets of the
Company as of December 31, 1995 and 1996 and the related consolidated statements
of income, stockholder's equity and cash flows for each of the years then ended,
and the unaudited  consolidated balance sheet of the Company as of June 30, 1997
and the related  consolidated  statements of income and stockholder's equity for
the six month period then ended, respectively, attached hereto as Section 3.7(a)
of the  Disclosure  Schedule,  fairly  present  in  all  material  respects,  in
conformity with generally accepted accounting principles applied on a consistent
basis  (except  as may be  indicated  in the  notes  thereto  or as set forth on
Section 3.7(b) of the Disclosure Schedule),  the consolidated financial position
of the Company and its  consolidated  Subsidiaries  as of the dates  thereof and
their  consolidated  results  of  operations  and,  in the  case of the  audited
financial statements,  cash flows for the periods then ended (subject to normal,
historically  consistent  year-end  adjustments  in the  case  of the  unaudited
interim financial statements).

     3.8  Properties.  (a) Neither the Company nor any Subsidiary  owns any real
property. The Company and the Subsidiaries have good and marketable title to, or
in the case of leased  property  have valid  leasehold  interests in, all assets
reflected on the Balance Sheet or acquired after the Balance Sheet Date,  except
for assets sold, or leaseholds  terminated,  since the Balance Sheet Date in the
ordinary course of business consistent with past practices.  None of such assets
is subject to any Liens,  except: (i) Liens disclosed on the Balance Sheet; (ii)
Liens for  taxes not yet due or being  contested  in good  faith  (and for which
adequate accruals or reserves have been established on the Balance Sheet); (iii)
Liens which do not materially  detract from the value of such property or assets
as now used,  or materially  interfere  with any present or intended use of such
property or assets;  (iv) Liens  attaching by operation of law,  incurred in the
ordinary course of business consistent with past practices and securing payments
not past due; or (v) Liens with  respect to which  deposits or pledges have been
made to obtain the release of any such Liens described in clause (iv) above.

     (b) The accounts receivable reflected on the Balance Sheet and all accounts
receivable arising between the Balance Sheet Date and the date of this Agreement
arose from bona fide transactions in the ordinary course of business and are not
subject to offset or deduction, and the goods and/or services involved have been
sold, delivered and/or fully-performed.  Management of the Company believes that
adequate  provision has been made for  contractual  discounts and adjustments to
all such accounts receivable from third-party payors.

     3.9 No Undisclosed  Material  Liabilities.  To the knowledge of the Company
(after  reasonable  inquiry),  there are no  liabilities  of the  Company or any
Subsidiary  of any  kind  whatsoever,  whether  accrued,  contingent,  absolute,
determined,  determinable or otherwise,  other than (i) liabilities disclosed or
provided  for in the Balance  Sheet or in the notes to the  balance  sheet as of
December 31,

                                        9





1996 referred to in Section 3.7, (ii) liabilities arising out of items disclosed
in Section 3.10 of the Disclosure  Schedule,  (iii) liabilities that the Company
is  retaining,  or the  Purchaser is assuming,  pursuant to Article IX, and (iv)
current  liabilities  accruing  in the  ordinary  course  of  business  that are
immaterial to the Company and the Subsidiaries taken as a whole.

     3.10  Litigation.  Except as set  forth in  Section  3.10 of the Disclosure
Schedule, there is no material action, suit, investigation,  proceeding or claim
made in writing  (other than claims made under benefit  plans  pursuant to which
the Company provides  behavioral health services) (whether insured or uninsured)
pending,  or to the knowledge of Seller  threatened,  against the Company or any
Subsidiary or any of their respective  properties before any court or arbitrator
or any governmental  body,  agency,  official or authority.  There is no action,
suit,  investigation  or  proceeding  pending,  or to the  knowledge  of  Seller
threatened,  against Seller,  the Company or any Subsidiary seeking to prohibit,
prevent  or  materially  alter or delay  the  consummation  of the  transactions
contemplated hereby.

     3.11 Material  Contracts.  (a) Section  3.11(a) of the Disclosure  Schedule
sets forth the following agreements,  contracts,  plans, leases, arrangements or
commitments (each, a "Contract" and, collectively, the "Contracts"):

          (i) any  agreement  providing  for the  delivery by the Company or any
     Subsidiary  of  behavioral   healthcare  services  for  non-Aetna  employee
     assistance  program and managed  behavioral  health business  providing for
     projected  annualized premiums (based upon June 30, 1997 business in force)
     to  the  Company  or  any   Subsidiary  of  $200,000  or  more   ("Customer
     Contracts");

          (ii) any provider contract between the Company or any Subsidiary and a
     third party  behavioral  healthcare  service provider (x) pursuant to which
     subcapitation or other alternative payment  arrangements are utilized,  and
     (y) in each of the nine regions served by the Company and the Subsidiaries,
     the largest  (measured by volume of services  provided)  provider  contract
     with respect to (1) in-patient  services,  (2) partial in-patient services,
     (3)  intensive  out-patient  services  and (4)  out-patient  services  (the
     "Provider Contracts");

          (iii) any agreement, other than Customer Contracts, Provider Contracts
     and License  Contracts  (as  defined  below),  for the  purchase or sale of
     goods, services, equipment or other assets providing for annual payments by
     or to the Company or any  Subsidiary  of  $150,000 or more,  other than any
     such  agreements  that are terminable by the Company or such  Subsidiary at
     will on thirty or fewer days' notice without any premium,  penalty or other
     similar  payment in excess of $10,000  becoming  payable by the  Company or
     such Subsidiary by virtue of such termination;

          (iv) any lease for real or  personal  property  in which the amount of
     payments  which the Company is required to make on an annual basis  exceeds
     $50,000;

                                       10





          (v)  any  partnership,   joint  venture  or  other  similar  contract,
     arrangement or agreement;

          (vi) any  contract  relating to  indebtedness  for  borrowed  money or
     guarantee or the deferred  purchase  price of property  (whether  incurred,
     assumed,  guaranteed  or  secured  by any  asset)  in an  amount  exceeding
     $100,000;

          (vii)  any  contract  or  cost  allocation   arrangement  relating  to
     outstanding indebtedness,  liabilities or obligations for amounts owing to,
     or notes  or  accounts  receivable  from,  or  leases,  contracts  or other
     commitments  or  arrangements  with or for the benefit of, Seller or any of
     its  Affiliates,   other  than  any  such  unwritten   contracts,   leases,
     commitments  or  arrangements  which will be  terminated on or prior to the
     Closing Date without giving rise to any further  obligations on the part of
     the Company or such Subsidiary;

          (viii) any contract  relating to the acquisition or disposition of any
     asset or  business  (whether  by merger,  sale of stock,  sale of assets or
     otherwise)  material to the Company and the Subsidiaries  taken as a whole,
     where the transactions contemplated thereby have not been consummated as of
     the date hereof;

          (ix) any  contract  or other  agreement  that by its terms  limits the
     right  of the  Company  or any  Subsidiary  to  compete  (x) in any line of
     business,  (y) with any Person or (z) in any geographic area or which would
     so limit the right of the Company or any Subsidiary after the Closing Date;

          (x) any  contract  or other  agreement  relating  to any  Intellectual
     Property  Rights used by the Company or any  Subsidiary,  which contract or
     other agreement  provides for annual license payments in excess of $100,000
     ("License Contracts"); and

          (xi) any other contract or commitment not made in the ordinary  course
     of business that is material to the Company and the Subsidiaries taken as a
     whole.

     (b)Except as set forth in Section 3.11(b) of the Disclosure Schedule,  each
Contract  is a valid  and  binding  agreement  of the  Company  or a  Subsidiary
enforceable in accordance with its terms, subject to (i) bankruptcy, insolvency,
fraudulent transfer, moratorium, reorganization and other similar laws affecting
creditors'  rights generally and the rights of creditors of insurance  companies
generally  and  (ii)  general   principles  of  equity  (regardless  of  whether
considered  in a  proceeding  at law or in  equity),  and as of the date of this
Agreement is in full force and effect,  and neither the Company,  any Subsidiary
nor, to the  knowledge of Seller,  any other party  thereto is in default in any
material respect under the terms of any such Contract. Seller has made available
to Purchaser a true and correct copy of each Contract.

                                       11





     (c)Except as set forth in Section  3.11(c) of the Disclosure  Schedule,  to
the knowledge of Seller as of the date of this Agreement,  no third party to any
of the  Contracts  intends to (i)  terminate or amend the terms  thereof or (ii)
refuse to renew same upon expiration of its current term.

     3.12  Compliance  with Laws.  Neither the Company  nor any  Subsidiary  has
violated or is in violation in any material respect of any applicable provisions
of any laws, statutes, ordinances, licenses, permits,  authorizations,  rules or
other  regulations.  Neither the Company nor any Subsidiary is in default in any
material  respect  under,  and no condition  exists that with notice or lapse of
time or both would  constitute  a default in any  material  respect  under,  any
order,  injunction or material judgment of any court, arbitrator or governmental
body, agency, official or authority.

     3.13 Brokers' Fees. Except for Merrill Lynch & Co., whose fees will be paid
by Seller, there is no investment banker,  broker,  finder or other intermediary
which has been  retained  by or is  authorized  to act on behalf of Seller,  the
Company or any  Subsidiary  who might be entitled to any fee or commission  from
Purchaser,  the Company or any of their respective  Affiliates upon consummation
of the transactions contemplated by this Agreement.

     3.14 Intellectual  Property. (a) Except as set forth in Section 3.14 of the
Disclosure Schedule,  each of the Company and its Subsidiaries owns or otherwise
has rights to use all  Intellectual  Property  Rights used in the conduct of the
Company's and such Subsidiaries' businesses as presently conducted.

     (b)(i)  Neither the Company nor any  Subsidiary is being sued or charged in
writing with or is a defendant in any claim, suit, action or proceeding relating
to its assets or business that involves a claim of  infringement of any material
Intellectual  Property  Rights and (ii) to the knowledge of Seller,  there is no
other  claim of such  infringement  by the  Company  or any  Subsidiary.  To the
knowledge of Seller, there is no continuing  infringement by any other Person of
any  of  the  material  Intellectual  Property  Rights  of  the  Company  or any
Subsidiary.

     3.15  Permits  and  Licenses.  Except as set forth in  Section  3.15 of the
Disclosure  Schedule,  each of the Company and its  Subsidiaries  possesses  all
permits, licenses and other authorizations (the "Licenses") of, and has made all
registrations  with, all  governmental or  accreditation  entities  necessary to
conduct the Company's and such Subsidiaries'  businesses as presently  conducted
(other than, in the case of Licenses and  registrations  for the Company,  Human
Affairs Alaska, Inc. or Human Affairs International of California, respectively,
such Licenses and registrations that are immaterial to such Person,  and, in the
case of Licenses and registrations for the other Subsidiaries, such Licenses and
registrations that are immaterial to the Company and the Subsidiaries taken as a
whole).  Except as set forth in  Section  3.15 of the  Disclosure  Schedule,  no
notice  from  any  governmental  or  accreditation   entities  with  respect  to
(including  an   investigation)   the   revocation,   termination,   suspension,
restriction,  modification or limitation of any material  License or the failure
to have any material License has been issued,  or given, to Seller,  the Company
or any Subsidiary,  nor, to the knowledge of Seller, is the issuance of any such
notice  or the  commencement  of any such  investigation  proposed,  pending  or
threatened.  A list of the material Licenses is set forth in Section 3.15 of the
Disclosure Schedule.

     3.16 Labor Matters.  There is no collective  bargaining agreement in effect
or, to the knowledge of Seller, other union organizational effort occurring with
respect to the employees of the

                                       12





Company.  There  is no labor  strike,  dispute,  stoppage  or  lockout  pending,
affecting,  or to the  knowledge of Seller,  threatened  against the Company and
during  the past two  years  there has not been any such  action.  Except as set
forth  in  Section  3.16  of the  Disclosure  Schedule,  there  are no  charges,
administrative  proceedings  or formal  complaints  or, to the  knowledge of the
Seller,  investigations of discrimination  (including  discrimination based upon
sex, age, marital status, race, national origin,  sexual preference,  disability
or veteran status) pending before the Equal Employment Opportunity Commission or
any other governmental entities against the Company or any Subsidiary.

     3.17 Insurance Policies. Section 3.17 of the Disclosure Schedule sets forth
(i) a true  and  complete  list  of all  insurance  policies  and  other  surety
arrangements of any kind whatsoever  which relate to the assets or businesses of
the Company or any Subsidiary (the "Policies") and (ii) a summary description of
each pending claim asserting liability to the Company or any Subsidiary equal to
or greater than $500,000 under each of the Policies.  All of the Policies are in
full force and effect.  During the three-year  period ending on the date hereof,
no such insurance policies or other surety arrangements have been canceled by an
insurer and no  application  for any such  insurance  policies  or other  surety
arrangements has been rejected by an insurer.

     3.18 Absence of Certain Commercial  Practices.  To the knowledge of Seller,
none  of  Seller,  the  Company,  any  Subsidiary,  or any of  their  respective
directors, officers or employees has:

     (a) given, proposed to give, or agreed to give any material gift or similar
material  benefit to any  customer,  supplier or any other person (other than as
described in subsection (b) of this Section 3.18), for the purpose of furthering
the business of the Company or any Subsidiary;

     (b) in connection with the business of the Company or any Subsidiary,  used
any  corporate  or  other  funds  for   contributions,   payments,   gifts,   or
entertainment,  or made any  expenditures  relating to political  activities  to
government employees,  officials or others in violation of any applicable law or
established or maintained any unlawful or unrecorded funds; or

     (c) offered, paid, solicited or received any remuneration (as such term has
been interpreted under 42 U.S.C. ss. 1320a-7b(b)) to induce or in return for any
referral of healthcare  business or ordering of healthcare  items or services in
violation of any federal or state civil or criminal law.

To the knowledge of Seller, none of Seller, the Company, any Subsidiary,  or any
of their respective  directors,  officers, or employees has accepted or received
any unlawful contributions,  payments or gifts in connection with the businesses
of the Company and the Subsidiaries.

     3.19  Assets.  Except as  disclosed  on Section  3.19(a) of the  Disclosure
Schedule,  the assets and  properties  owned or leased by the Company are all of
the assets and  properties  necessary to conduct the business and  operations of
the  Company  as  currently  conducted  by the  Company.  Except as set forth on
Section  3.19(b) of the  Disclosure  Schedule,  Seller  covenants  and agrees to
contribute  or cause to be  contributed  or  transferred  to the  Company for no
additional  consideration,  good and  marketable  title,  free and  clear of all
Liens, to those assets and properties  (exclusive of  Intellectual  Property and
real  property)  ("Contributed  Assets")  set forth on  Section  3.19(b)  of the
Disclosure Schedule that are owned or leased by Seller or an Affiliate of Seller
and used  exclusively  or  principally  in the  business and  operations  of the
Company or its Subsidiaries. The contribution or transfer of the

                                       13





Contributed  Assets  shall  not be taken  into  consideration  for  purposes  of
calculating  the Closing  Stockholder's  Equity.  The only assets and properties
(exclusive of Intellectual  Property and real property) within the categories of
assets and  properties set forth on Section  3.19(a) of the Disclosure  Schedule
which will not be Contributed  Assets are those assets and properties  which the
Company  will have the right to  utilize  pursuant  to the  Transition  Services
Agreement.  Section 3.19(c) of the Disclosure Schedule also sets forth a list of
the general  categories of services that have been historically  provided to the
Company and the Subsidiaries by Seller or its Affiliates.

     3.20 No  Adverse  Changes.  Except  as set  forth  in  Section  3.20 of the
Disclosure  Schedule,  since  the  Balance  Sheet  Date,  the  Company  and  the
Subsidiaries  have conducted  their  respective  businesses only in the ordinary
course  of  business,  and  none of  them  has:  (i)  through  the  date of this
Agreement,  suffered any material adverse change in its business,  properties or
financial  condition,   including  any  material  damage,  destruction  or  loss
affecting its assets, (ii) made any material increase in compensation payable or
to  become  payable  to any of its  employees  or made or  promised  to make any
material bonus payment to any of its employees,  or made any material  change in
personnel  policies,  insurance  benefits  or  other  compensation  arrangements
affecting any of its employees (other than increases, promises or changes in the
ordinary  course  consistent  with past  practices or pursuant to Benefit Plans,
Benefit  Arrangements  and  practices  in effect as of the Balance  Sheet Date);
(iii) sold,  transferred,  leased to others or otherwise  disposed of any of its
material assets (except for (x) inventory sold or used in the ordinary course of
business  consistent  with past  practices or (y) assets sold or disposed of and
replaced by other similar assets), canceled or compromised any debts owed to, or
claims  relating to, its assets,  business or  operations  which are of material
value or waived,  compromised or released any rights which are of material value
or (iv)  through the date of this  Agreement,  suffered any  termination  of any
Contract to which it is or was a party representing $500,000 or more of revenues
to the Company and the  Subsidiaries  for the 12-month period ending on the date
of this Agreement.

     3.21  Disclosure.  To the  knowledge  of  Seller,  as of the  date  of this
Agreement,  no  representation  or  warranty  of the Seller (as  modified by the
Disclosure Schedule) contained in this Agreement,  and no statement contained in
any certificate,  document or other instrument  furnished to the Purchaser by or
on behalf of Seller pursuant to this Agreement, contains any untrue statement of
a  material  fact or  omits  to  state a  material  fact  necessary  to make the
statements  contained  herein or therein,  in light of the  circumstances  under
which they were made, not misleading.

                                   ARTICLE IV

                   Representations And Warranties Of Purchaser

            Purchaser hereby represents and warrants to Seller that:

     4.1   Organization   and  Existence.   Purchaser  is  a  corporation   duly
incorporated,  validly  existing  and in good  standing  under  the  laws of its
jurisdiction  of  incorporation  and  has  all  requisite  corporate  power  and
authority to carry on its business as now conducted.

     4.2 Corporate  Authorization.  The execution,  delivery and  performance by
Purchaser  of  this  Agreement  and  the   consummation   by  Purchaser  of  the
transactions  contemplated  hereby are within  Purchaser's  corporate powers and
have been duly authorized by all necessary corporate action

                                       14





on the  part of  Purchaser.  This  Agreement  constitutes  a valid  and  binding
obligation of Purchaser,  enforceable  against  Purchaser in accordance with its
terms, subject to (i) bankruptcy,  insolvency,  fraudulent transfer, moratorium,
reorganization and other similar laws affecting  creditors' rights generally and
(ii)  general  principles  of equity  (regardless  of  whether  considered  in a
proceeding at law or in equity).

     4.3  Governmental  Authorization;  Consents.  (a)  Except  as set  forth in
Section  4.3(a) of the Purchaser  Disclosure  Schedule and except for applicable
requirements  of the  HSR  Act,  neither  the  execution  and  delivery  of this
Agreement by Purchaser,  nor the  consummation by Purchaser of the  transactions
contemplated hereby will require any action by or in respect of, or filing with,
any  governmental  body,  agency,  official or authority  (other than actions or
filings that are immaterial to Seller,  the Company,  the  Subsidiaries  and the
consummation of the transactions contemplated hereby).

     (b)  Except as set forth in  Section  4.3(b)  of the  Purchaser  Disclosure
Schedule, no consent, approval, waiver or other action by any Person (other than
any governmental body,  agency,  official or authority referred to in (a) above)
under any material contract,  agreement,  indenture,  lease, instrument or other
document  to which  Purchaser  is a party or by which it is bound is required or
necessary  for the  execution,  delivery and  performance  of this  Agreement by
Purchaser or the consummation of the transactions contemplated hereby.

     4.4 Non-Contravention. The execution, delivery and performance by Purchaser
of this  Agreement  do not and  will not (i)  contravene  or  conflict  with the
certificate of  incorporation or bylaws of Purchaser,  (ii) assuming  compliance
with the matters  referred to in Section  4.3(a),  contravene or conflict in any
material  respect with or constitute a violation in any material  respect of any
provision of any law, regulation,  judgment, injunction, order or decree binding
upon Purchaser,  (iii)  constitute a default under, or give rise to any right of
termination,  cancellation  or  acceleration  of  any  right  or  obligation  of
Purchaser  under,  or to a loss of any  benefit to which  Purchaser  is entitled
under,  any  provision of any  material  agreement,  contract or other  material
instrument binding upon Purchaser or any material license,  franchise, permit or
other  similar  material  authorization  held by Purchaser or (iv) result in the
creation or imposition of any Lien on any material asset of Purchaser.

     4.5 Brokers' Fees. There is no investment banker,  broker,  finder or other
intermediary  which has been  retained by or is  authorized  to act on behalf of
Purchaser who might be entitled to any fee or  commission  from Seller or any of
its  Affiliates  upon  consummation  of the  transactions  contemplated  by this
Agreement.

     4.6 Financing. Purchaser has, and at all times until the Closing will have,
funds sufficient to consummate the transactions contemplated hereby, which funds
are not,  and shall not,  be subject to any  contingencies  or  consents  by any
Person in order to consummate such transactions.

     4.7  Purchase  for  Investment.  Purchaser  is  purchasing  the  Shares for
investment for its own account and not with a view to, or for sale in connection
with, any distribution thereof.

     4.8  Litigation.  There is no action,  suit,  investigation  or  proceeding
(whether insured or uninsured) pending against, or to the knowledge of Purchaser
threatened against or affecting, Purchaser before any court or arbitrator or any
governmental body, agency or official which in any

                                       15





manner  challenges or seeks to prevent,  enjoin,  alter or materially  delay the
transactions contemplated hereby.

     4.9 Inspections.  Purchaser is an informed and sophisticated  purchaser, is
familiar  with the business of the  Company,  and has engaged  expert  advisors,
experienced  in the  evaluation  and purchase of companies  such as the Company.
Purchaser has undertaken such  investigation  and has been provided with and has
evaluated such documents and information as it has deemed necessary to enable it
to make an informed and  intelligent  decision  with  respect to the  execution,
delivery and performance of this Agreement.  Purchaser  acknowledges that Seller
has made no  representation  or  warranty  as to the  Shares  or the  prospects,
financial or otherwise, of the Company or the Subsidiaries,  except as expressly
set forth herein.

                                    ARTICLE V

                               Covenants Of Seller

     Seller agrees that:

     5.1 Conduct of the Company.  From the date hereof  until the Closing  Date,
Seller shall cause the Company and the  Subsidiaries to conduct their businesses
in the ordinary course consistent with past practices.

     (a) Except as otherwise provided in this Agreement or Section 5.1(a) of the
Disclosure  Schedule,  from the date of this  Agreement  until the Closing Date,
without the prior written  consent of the Purchaser,  Seller will not permit the
Company or any Subsidiary to:

     (i) adopt or propose  any change in its  certificate  of  incorporation  or
bylaws;

     (ii)  merge or  consolidate  with any other  Person or  acquire  or lease a
material amount of assets of any other Person, except for those assets which are
owned by Seller or Affiliates of Seller and identified in Section 3.19(b) of the
Disclosure  Schedule which will be contributed or transferred to the Company for
no consideration;

     (iii)  declare,  set aside or pay any dividend or other  distribution  with
respect to any shares of capital stock of the Company, or repurchase,  redeem or
otherwise  acquire any  outstanding  shares of capital stock, or other ownership
interests in, the Company or any Subsidiary;

     (iv) incur,  assume or guarantee any  indebtedness for borrowed money other
than, in each case, (x) in a principal  amount not exceeding  $100,000 or (y) in
the ordinary course of business and in amounts and on terms consistent with past
practices;

     (v) create or assume any Lien on any material asset other than

                                       16





         in the ordinary course of business consistent with past practices;

     (vi) make any loan,  advance or capital  contributions  to or investment in
any  Person,  other  than  loans,   advances  or  capital  contributions  to  or
investments  made (x) that are  immaterial  to the Company and the  Subsidiaries
taken as a whole,  (y) pursuant to existing  contracts or  commitments or (z) in
the ordinary course of business consistent with past practices;

     (vii) sell,  lease,  license or otherwise dispose of any material assets or
property  except (x)  pursuant  to  existing  contracts  or  commitments  (which
contracts or commitments are described in Section  5.1(a)(vii) of the Disclosure
Schedule) or (y) in the ordinary course consistent with past practices;

     (viii)  change any method of accounting  or  investment,  tax or accounting
practice,  except for any such change required by reason of a concurrent  change
in generally accepted accounting principles or law;

     (ix) enter  into or  consummate  any joint  venture,  partnership  or other
similar  arrangement or, except as otherwise  permitted or required  pursuant to
this Agreement, form any other new arrangement for the conduct of its business;

     (x) terminate, renew, amend or otherwise alter any of the material Customer
Contracts  or  other  Contracts,  except  in the  ordinary  course  of  business
consistent with past practices;

     (xi) except as otherwise  permitted or required pursuant to this Agreement,
enter into any written contract or other agreement with Seller, any Affiliate of
Seller or any  Affiliate of the Company  (other than written  contracts or other
agreements between or among the Company and the Subsidiaries);

     (xii) increase or otherwise  change the rate or nature of the  compensation
(including wages, salaries and bonuses) which is paid or payable to any employee
or  independent  contractor  of the  Company  or any  Subsidiary,  except in the
ordinary  course of  business  consistent  with past  practices  or  pursuant to
existing  Employee  Plans,  Benefit  Arrangements,  and practices with have been
disclosed to Purchaser;

     (xiii)  adopt or commit to adopt any employee  plan or benefit  arrangement
other than an Employee Plan or Benefit  Arrangement or make material  amendments
to any such Employee Plan or Benefit  Arrangement  except to the extent required
by law or necessary to preserve the nature of the benefits  provided  under such
plan or arrangement;

                                       17





     (xiv) issue or commit to issue any  additional  shares of capital  stock or
option or warrant of the Company or any Subsidiary;

     (xv) enter into any  transaction,  contract  or  agreement  material to the
Company  and the  Subsidiaries  taken as a whole,  other than  transactions  and
commitments in the ordinary  course of business  consistent  with past practices
and other than those contemplated by this Agreement;

     (xvi) alter in any material respect the  consideration  paid or received by
the Company for those  services set forth on Section  3.19(c) of the  Disclosure
Schedule; or

     (xvii)agree or commit to do any of the foregoing.

Seller will not, and will not permit the Company or any  Subsidiary  to (i) take
or agree or commit to take any action  that would  make any  representation  and
warranty of Seller hereunder inaccurate in any material respect at, or as of any
time prior to, the Closing  Date or (ii) omit or agree or commit to omit to take
any action necessary to prevent any such  representation  or warranty from being
inaccurate in any material respect at any such time.

     (b)Except as otherwise  provided in this Agreement or Section 5.1(b) of the
Disclosure  Schedule,  from the date of this  Agreement  until the Closing Date,
Seller will cause the Company and the Subsidiaries to:

     (i)  maintain  their books and records in the usual,  regular and  ordinary
manner consistent with past practices;

     (ii) preserve their businesses and maintain all of their material Licenses;

     (iii) preserve  generally the goodwill of the businesses of the Company and
the Subsidiaries; and

     (iv)  continue  to  perform  in  the  ordinary   course  their   respective
obligations under the Contracts.

     5.2 Access to Information. (a) From the date hereof until the Closing Date,
Seller  will  give,  and will cause the  Company  and each  Subsidiary  to give,
Purchaser,  its  counsel,  financial  advisors,  auditors  and other  authorized
representatives reasonable access to the offices,  properties, books and records
of the  Company and the  Subsidiaries;  provided  that all such access  shall be
arranged solely by prior request made by Purchaser to the persons  designated by
Seller as the contact  people for such  purposes.  Purchaser  agrees not to, and
shall cause its  counsel,  financial  advisors,  auditors  and other  authorized
representatives not to, directly contact the Company, any Subsidiary,  or any of
their respective officers, directors or employees unless such designated contact
persons have approved such contact.

                                       18





     (b) From the date hereof until the Closing Date,  Seller will furnish,  and
will cause the  Company  and each  Subsidiary  to  furnish,  to  Purchaser,  its
counsel, financial advisors,  auditors and other authorized representatives such
financial and operating data and other  information  relating to the Company and
the Subsidiaries as such Persons may reasonably request.

     (c) From the date  hereof  until  the  Closing  Date,  notwithstanding  the
foregoing,  Purchaser shall not have access to personnel  records of the Company
or any Subsidiary  relating to medical  histories or other  sensitive  personnel
information the disclosure of which could subject Seller to risk of liability.

     5.3 Notices of Certain Events. Seller shall promptly notify Purchaser of:

          (i) any notice or other  communication  from any Person  alleging that
     the consent of such Person is or may be  required  in  connection  with the
     transactions contemplated by this Agreement;

          (ii) any  notice  or other  communication  from  any  governmental  or
     regulatory   agency  or  authority  in  connection  with  the  transactions
     contemplated by this Agreement; and

          (iii)  any  actions,  suits,  claims,  investigations  or  proceedings
     commenced or, to its knowledge  threatened,  against Seller, the Company or
     any Subsidiary  that, if pending on the date of this Agreement,  would have
     been required to have been disclosed pursuant to Section 3.10.

     5.4  Resignations.  Seller  will  deliver to  Purchaser  at or prior to the
Closing Date the  resignations  of all officers and directors of the Company and
each Subsidiary who will be officers, directors or employees of Seller or any of
its Affiliates  after the Closing Date from their positions with the Company and
each Subsidiary.

     5.5 No Shop. Purchaser  contemplates the expenditure of substantial sums of
time  and  money  in  connection  with  legal,  accounting,  financial,  and due
diligence work to be performed in conjunction with the purchase of the shares as
contemplated   herein  (the   "Transaction")   and  may  forego  other  business
opportunities prior to the Closing. Accordingly,  Seller acknowledges and agrees
that,  from the date hereof through the Closing Date (or the termination of this
Agreement) (the "Restricted Period"),  neither Seller nor the Company,  directly
or indirectly, without Purchaser's prior written consent, shall initiate or hold
discussions  with any Person  (other  than  Purchaser  and its  representatives)
concerning  any  transaction   substantially   similar  to  the  Transaction  or
inconsistent  with the Transaction,  directly or indirectly,  whether by sale of
outstanding stock,  issuance of additional  securities,  merger,  consolidation,
sale or lease of  assets,  affiliation,  joint  venture,  or other  transaction.
During the Restricted Period, Seller will promptly notify Purchaser by telephone
and  thereafter  confirm in writing  via  telecopy  if any such  discussions  or
negotiations are sought in writing to be initiated with, or any such proposal or
possible proposal is received in writing,  directly or indirectly,  by Seller or
the Company and any such notice  will  include any terms and  conditions  of any
such proposal.

     5.6 Contributed  Assets.  Seller has previously  delivered to the Purchaser
lists of the

                                       19





Contributed  Assets.  Seller has  informed the  Purchaser  that the lists it has
delivered  may need to be updated or revised.  Seller  agrees  that,  as soon as
reasonably  practicable  after the date hereof,  it will retain a business  firm
reasonably satisfactory to Purchaser for the purposes of taking an inventory and
valuation of the Contributed Assets and compiling a comprehensive list of all of
the Contributed Assets (the "Inventory List"). Purchaser shall have the right to
consult with the business  firm and observe the inventory  count and  valuation.
The fees and  expenses  of the  business  firm and the other costs of taking the
inventory  shall be borne  equally  by  Seller  and  Purchaser  and the fees and
expenses  of the  business  firm with  respect  to, and the other  costs of, the
valuation shall be borne by Purchaser.  At the Closing,  Seller shall deliver an
officer's  certificate  to the  Purchaser  stating  that the  Inventory  List is
complete and accurate in all material respects.

                                   ARTICLE VI

                             Covenants Of Purchaser

     Purchaser agrees that:

     6.1  Confidentiality.  All information and documents furnished to Purchaser
or any of the Persons  referred  to in Section  5.2 for any  purpose  under this
Agreement will be treated as  "Evaluation  Material"  under the  Confidentiality
Agreement dated March 10, 1997 between AHP Holdings, Inc. and Purchaser.  Seller
and Purchaser hereby agree that such  Confidentiality  Agreement shall terminate
and be of no further force and effect as of the Closing Date.

     6.2 Access.  Purchaser will cause the Company and the Subsidiaries,  on and
after the Closing  Date for a period of seven years  thereafter  (or such longer
period as may be necessary for income tax audit purposes or compliance with laws
purposes),  to afford promptly to Seller and its agents,  upon reasonable notice
to the persons  designated by Purchaser as the contact people for such purposes,
reasonable  access  during normal  business  hours to their  properties,  books,
records,  employees  and auditors to the extent  necessary  to permit  Seller to
determine any matter relating to its rights and obligations  hereunder or to any
period  ending on or before the Closing Date.  Seller will hold,  and will cause
its officers, directors, employees,  accountants, counsel, consultants, advisors
and agents to hold, in confidence,  unless  compelled to disclose by judicial or
administrative  process  or by  other  requirements  of  law,  all  confidential
documents and information  concerning the Company and the Subsidiaries  provided
to it pursuant to this Section 6.2. All access  afforded Seller pursuant to this
Section 6.2 shall be without  interference with the conduct of the businesses of
the Company and the  Subsidiaries  and shall be arranged solely by prior request
made by Seller to the persons  designated by Purchaser as the contact people for
such purposes.

     6.3 Insurance.  On or prior to the Closing, Seller shall purchase, or cause
to be purchased,  "tail" insurance coverage  (including  professional  liability
insurance  coverage),  with  limitations on liability of no less than $1,000,000
per claim and $7,000,000 in the aggregate and no more than  $5,000,000 per claim
and  $20,000,000 in the aggregate,  covering any and all claims that may be made
during the  period  beginning  on the  Closing  Date and  ending on the  seventh
anniversary  of the Closing Date in respect of any acts or  omissions  occurring
before  the  Closing  Date  by the  Company,  any  Subsidiary  or  any of  their
respective  employees,  contracted providers of behavioral  healthcare services,
subcontractors  or agents.  The parties shall negotiate in good faith and agree,
prior to Closing, within

                                       20





the  range  specified   above,  on  the  appropriate  per  claim  and  aggregate
limitations on liability for such tail insurance.

     6.4 Use of Names.  After  the  Closing,  Purchaser  shall not use the names
"Aetna U.S.  Healthcare",  "Aetna",  "U.S.  Healthcare",  or any  combination or
derivation of the same in connection with the Company,  any Subsidiary or any of
their respective  operations,  or any other entity or operations associated with
Purchaser.  After the  Closing,  except as set  forth in the  Master  Agreement,
Seller and its Affiliates  shall not use the name "Human Affairs  International"
or any  combination  or derivation of the same in connection  with Seller or its
Affiliates  or any of  their  respective  operations,  or any  other  entity  or
operations associated with Seller.

     6.5  Headquarters  Lease.  With  respect  to the lease  (the  "Headquarters
Lease") of real property constituting the Company's  headquarters  facilities in
Sandy, Utah (the "Headquarters  Property"),  at the Closing,  Seller shall cause
Aetna Life Insurance  Company ("Aetna Life"),  as lessee under the  Headquarters
Lease, to sublet to the Company the Headquarters  Property on substantially  the
same terms and conditions as Aetna Life leases the Headquarters Property,  which
sublet shall be pursuant to a customary  sublease  agreement to be negotiated by
the parties prior to the Closing in good faith  (provided that the Company shall
not have any option to renew or extend the original term of the sublease).

     6.6  Retention  Arrangements.  From and after the Closing  Date,  Purchaser
agrees that it shall, and shall cause the Company to, assume  responsibility for
and comply with the terms and  conditions of the retention  agreements and other
arrangements set forth in Section 6.6 of the Disclosure Schedule (the "Retention
Arrangements");  provided  that Seller shall be  responsible  for any amounts in
excess  of  target  bonus  amounts  in the  aggregate  payable  pursuant  to the
Retention Arrangements.

                                   ARTICLE VII

                            Covenants Of Both Parties

     The parties hereto agree that:

     7.1  Reasonable  Efforts.  Subject  to the  terms  and  conditions  of this
Agreement,  each party will use all  reasonable  efforts to take, or cause to be
taken,  all  actions  and to do, or cause to be done,  all things  necessary  or
desirable under  applicable laws and regulations to consummate the  transactions
contemplated by this Agreement,  including,  without limitation, the preparation
and filing as promptly as  practicable  after the date of this  Agreement of (i)
all applicable  forms under the HSR Act and (ii) all applicable  forms necessary
in order to obtain any other required government approvals. Seller and Purchaser
each agree, and Seller, prior to the Closing, and Purchaser,  after the Closing,
agree to cause the  Company,  to  execute  and  deliver  such  other  documents,
certificates,  agreements  and other  writings and to take such other actions as
may be necessary or desirable in order to consummate or implement  expeditiously
the transactions contemplated by this Agreement.  Seller will use all reasonable
efforts,  in  cooperation  with  Purchaser,  to obtain those consents from third
parties with respect to the agreements  described in Items 1, 2 and 5 of Section
3.4 of the Disclosure Schedule.

     7.2 Certain Filings.  Seller and Purchaser shall cooperate with one another
(a) in

                                       21





determining  whether  any  action  by or in  respect  of, or  filing  with,  any
governmental  body, agency,  official or authority is required,  or any actions,
consents,  approvals or waivers are required to be obtained  from parties to any
material  contracts,  in connection with the  consummation  of the  transactions
contemplated by this Agreement and (b) in taking such actions or making any such
filings,  furnishing  information  required in connection  therewith and seeking
timely to obtain any such actions, consents, approvals or waivers.

     7.3 Public  Announcements.  Each party agrees to obtain the approval of the
other party before issuing any press release or making any public statement with
respect to this Agreement or the transactions  contemplated  hereby,  except for
such press releases or public statements as may be required by applicable law or
any listing agreement with any national securities exchange.

     7.4 Related Agreements.  Each party acknowledges that the Master Agreement,
the Transition Services Agreement and the HMO and non-HMO Health Care Agreements
(collectively, the "Related Transaction Agreements") are an integral part of the
transactions  contemplated by this  Agreement.  Both parties agree to comply (or
cause their Affiliates to comply) with the Related Transaction Agreements.

     7.5 Home Office Lease.  Certain of the Company's employees currently occupy
space in Seller's home office (the "Home Office"). Prior to Closing, the parties
will discuss the necessity of maintaining  this  arrangement.  At the request of
the Company,  Seller or one of its  Affiliates  will enter into a lease with the
Company with respect to the  Company-occupied  space in the Home Office on terms
that are reasonably satisfactory to the parties,  provided that the term of such
lease shall be no longer than two years  following the Closing Date and the rent
due thereunder shall be at the same rate charged to other Aetna business units.

     7.6 Co-Located Space. The Company currently shares office space with Seller
or its Affiliates in a number of locations  identified on Section 3.11(a)(iv) of
the Disclosure  Schedule.  Unless prohibited under any applicable primary lease,
prior to the Closing, Seller and the Company will enter into sublease agreements
with respect to these shared locations on terms that are reasonably satisfactory
to Seller and the  Company.  The rent  charged to the  Company  pursuant to such
sublease   agreements   shall  be  determined  in  accordance   with  historical
methodologies.  Seller may increase the rent at any time to reflect increases in
its actual costs under the applicable  primary leases. The term of the subleases
shall be  mutually  agreed upon prior to the  Closing,  but shall not exceed the
shorter of (i) two years from the Closing  Date and (ii) the  remaining  term of
the primary lease;  provided  that, in connection  with Seller  terminating  the
primary lease or  subletting  the entire  leased  premises,  the sublease may be
terminated by Seller upon at least 180 days' prior written notice.

     7.7  Transition  Services  Standards.  Each party  agrees to use good faith
efforts  to  prepare  a  joint  description  of the  standards  of  quality  and
timeliness  that the  services to be  performed  under the  Transition  Services
Agreement  will be  performed,  which  description  will be attached  thereto as
Schedule C.

                                  

                                       22

                                  ARTICLE VIII

                                   Tax Matters

                                                        23




     8.1 Tax  Definitions.  The  following  terms,  as  used  herein,  have  the
following meanings:

     "Code" means the Internal Revenue Code of 1986.

     "Federal  Taxes" means United  States  Federal  income,  environmental  and
alternative or add-on minimum taxes.

     "Final  Determination"  shall  mean,  with  respect  to  Federal  Taxes,  a
"determination"  as defined in Section  1313(a) of the Code or  execution  of an
Internal  Revenue  Service  Form 870AD  and,  with  respect to Taxes  other than
Federal Taxes,  any final  determination  of liability in respect of a Tax that,
under  applicable law, is not subject to further appeal,  review or modification
through proceedings or otherwise, including but not limited to the expiration of
a statute of  limitations  or a period  for the  filing of claims  for  refunds,
amended returns or appeals from adverse determinations.

     "Post-Closing  Tax Period"  means any Tax period  ending  after the Closing
Date.

     "Pre-Closing Tax Period" means any Tax period ending on or before the close
of business on the Closing Date.

     "Tax" means (i) any net income,  alternative  or add-on  minimum tax, gross
income, gross receipts, sales, use, ad valorem, value added, franchise, profits,
license,  withholding  on amounts  paid to or by the Company or any  Subsidiary,
payroll,  employment,  excise, severance, stamp, occupation,  premium, property,
environmental  or windfall profit tax, custom,  duty or other tax,  governmental
fee or other like assessment or charge of any kind whatsoever, together with any
interest or any penalty,  addition to tax or  additional  amount  imposed by any
governmental authority (a "Taxing Authority")  responsible for the imposition of
any such tax  (domestic  or  foreign),  (ii)  liability  of the  Company  or any
Subsidiary  for the  payment of any  amounts of the type  described  in (i) as a
result of being a member of an  affiliated,  consolidated,  combined  or unitary
group for any period during the Tax  Indemnification  Period and (iii) liability
of the  Company or any  Subsidiary  for the  payment of any  amounts of the type
described in (i) as a result of any express or implied  obligation  to indemnify
any other Person.

     "Tax  Indemnification  Period" means (i) any  Pre-Closing Tax Period of the
Company or any Subsidiary, (ii) with respect to any Tax described in clause (ii)
of the  definition of "Tax",  any  Pre-Closing  Tax Period of the Company or any
Subsidiary  and the  taxable  year of any  member of a group  described  in such
clause (ii) which  includes  (but does not end on) the Closing  Date,  and (iii)
with respect to any Tax  described in clause (iii) of the  definition  of "Tax",
the  survival  period of the  indemnification  obligation  under the  applicable
contract.

     "Tax  Sharing  Agreement"  means  the  Amended  and  Restated  Tax  Sharing
Agreement executed by the Company on September 14, 1995.

     8.2  Tax  Representations.  Except  as  set  forth  in  Section  8.2 of the
Disclosure

                                       24





Schedule,  (i)  all  Tax  returns,  statements,  reports  and  forms  (including
estimated  tax  returns  and  reports)  required  to be filed  with  any  Taxing
Authority  with  respect  to any  Pre-Closing  Tax Period by or on behalf of the
Company or any Subsidiary  (collectively,  the "Returns"),  have been filed when
due in accordance  with all  applicable  laws;  (ii) the Returns are correct and
complete in all material  respects;  (iii) the Company and the Subsidiaries have
timely paid,  withheld or made  provision for all Taxes shown as due and payable
on the Returns that have been filed;  (iv) the Company and the Subsidiaries have
made or will on or before the Closing Date make  provision for all Taxes payable
by the Company and the Subsidiaries for any Pre-Closing Tax Periods for which no
Return has yet been filed, excluding Taxes to the extent that Seller is required
under this Article VIII to pay, reimburse or indemnify Purchaser  therefor;  (v)
the charges, accruals and reserves for Taxes with respect to the Company and its
Subsidiaries  for any  Pre-Closing  Tax  Period  (excluding  any  provision  for
deferred  income taxes and excluding Taxes to the extent that Seller is required
under this Article  VIII to pay,  reimburse  or  indemnify  Purchaser  therefor)
reflected on the books of the Company and the Subsidiaries are adequate to cover
such Taxes;  (vi) all Returns filed with respect to taxable years of the Company
and the Subsidiaries  through the taxable year ended December 31, 1987 have been
examined and closed or are Returns  with-respect to which the applicable  period
for  assessment  under  applicable  law,  after giving  effect to  extensions or
waivers, has expired; (vii) neither the Company nor any Subsidiary is delinquent
in the payment of any Tax or has requested any extension of time within which to
file or send any Return,  which Return has not since been filed or sent;  (viii)
there are no  requests  for  rulings in respect of any Tax  pending  between the
Company or any Subsidiary and any Taxing Authority;  (ix) there are no liens for
Taxes upon the assets of the Company or any Subsidiary  except liens for current
Taxes not yet due; (x) Seller is not subject to  withholding  under Section 1445
of the Code with respect to any transaction contemplated hereby; (xi) since June
9,  1988,  neither  the  Company  nor any  Subsidiary  has been a  member  of an
affiliated  group other than one of which either  Aetna Inc. or Aetna  Services,
Inc.  (formerly Aetna Life and Casualty Company) was the common parent, or filed
or been included in a combined,  consolidated  or unitary  Return other than one
filed by Aetna, Inc. or Aetna Services,  Inc.  (formerly Aetna Life and Casualty
Company);  (xii) neither the Company nor any  Subsidiary is currently  under any
contractual obligation to indemnify any other Person with respect to Taxes or is
a party to any agreement,  other than the Tax Sharing  Agreement,  providing for
payments  with  respect to taxable  income or Taxes;  (xiii) no issues have been
raised in  writing  (and are  currently  pending)  by any  taxing  authority  in
connection  with any of the Tax  Returns  referred  to in  clause  (i),  and all
deficiencies  asserted or assessments  made as a result of any  examination by a
taxing  authority  of such Tax  Returns  have been  paid in full;  and (xiv) the
information  provided by Seller to Purchaser regarding (x) Seller's tax basis in
the stock of the Company and the  Subsidiaries,  (y) the tax basis of the assets
of the Company and the  Subsidiaries,  and (z) the state tax position of Seller,
the Company and the Subsidiaries,  is true and accurate as of the date hereof or
as of the relevant date specified therein in all material respects.

     8.3  Elections.  (i) Each of Seller and  Purchaser  shall  make  timely and
irrevocable  elections under Section 338(h)(10) of the Code and, if permissible,
similar  elections  under any  applicable  state or local  income  tax laws with
respect to the Company and each Subsidiary. Seller will not, and will not permit
the Company or any Subsidiary to take, cause or permit to be taken any

                                       25





action  that would  disqualify  this  transaction  as a deemed  asset sale under
Section  338(h)(10) of the Code.  Each of Seller and Purchaser  shall report the
transaction  consistent  with such  elections  under  Section  338(h)(10) or any
similar  state or local  tax  provision  (the  "Elections")  and  shall  take no
position contrary thereto unless and to the extent required to do so pursuant to
a Final  Determination.  Seller  and  Purchaser  agree  that as a result  of the
Elections,  the deemed asset sales resulting from the Elections must be included
in the final  Return of the Company for the  Pre-Closing  Tax period to be filed
with any  Taxing  Authority  of a  jurisdiction  for  which  the  Elections  are
applicable.

     (ii) Each of Seller and Purchaser  shall execute at the Closing any and all
forms  necessary to effectuate  the Elections  (including,  without  limitation,
Internal  Revenue  Service  Form 8023-A and any similar  forms under  applicable
state and local income tax laws (the "Section 338  Forms")).  Each of the Seller
and the  Purchaser  shall cause the Section 338 Forms to be duly  executed by an
authorized  person  and shall  duly and  timely  file the  Section  338 Forms in
accordance with applicable Tax laws and the terms of this Agreement.

     (iii) Each of Seller and  Purchaser  agree that in making the  Elections it
shall  report the  Aggregate  Deemed  Sale Price (as  defined  under  applicable
Treasury  Regulations)  of the assets of the Company (the "ADSP") as  calculated
(x) by using only the  Closing  Payment,  as  adjusted  pursuant  to Section 2.4
hereof,  as the purchase  price of the Shares and (y) by not taking into account
as an assumed  liability  any  liability  for Taxes to the extent that Seller is
required  under this  Article  VIII to pay,  reimburse  or  indemnify  Purchaser
therefor. Each of Seller and Purchaser agrees to allocate such ADSP as set forth
in Section  8.3 of the  Disclosure  Schedule,  which  shall be  prepared  by the
parties prior to the Closing Date and which shall  reflect an allocation  agreed
to by the parties.  Each of Seller and Purchaser will reflect such allocation in
all  applicable  tax returns filed by any of them,  including but not limited to
the Section 338 Forms.  Each of Seller and  Purchaser  shall not take a position
before any Taxing Authority or otherwise  (including in any Return) inconsistent
with such  allocation  unless and to the extent  required to do so pursuant to a
Final Determination.

     8.4  Termination of Existing Tax Sharing  Agreements.  Any and all existing
tax  sharing  agreements  or  arrangements  binding  the  Company  or any of its
Subsidiaries (including,  without limitation, the Tax Sharing Agreement) and any
other  agreement,  express  or  implied,  relating  to taxable  income  shall be
terminated as of the Closing Date.

     8.5 Tax Returns.  (a) Seller  shall  timely  prepare all Tax Returns of the
Company and the Subsidiaries  for all Pre-Closing Tax Periods.  Such Tax Returns
shall be prepared in an manner  consistent  with past  practice and, on such Tax
Returns, no positions shall be taken,  elections made, or method adopted that is
inconsistent with positions taken,  elections made, or methods used in preparing
similar Tax Returns in prior  periods  without  the consent of  Purchaser  which
consent shall not be unreasonably withheld.

     (b) Seller  shall file or cause to be filed when due all Tax Returns of the
Company and the Subsidiaries for all Pre-Closing Tax Periods that are filed on a
consolidated,  combined,  or unitary basis by the Seller or the parent of Seller
(including all federal income Tax Returns), and

                                       26





Seller  shall be  responsible  for the  contents of such Tax Returns and for the
payment of all Taxes shown to be due  thereon;  provided,  however,  that Seller
shall  furnish  Purchaser and the Company with copies of such Tax Returns of the
Company  and the  Subsidiaries,  on a  separate  company  basis,  within 30 days
following  the filing  date.  Seller  shall  prepare  and send to the Company as
promptly as  practicable  but at least five  business days prior to the due date
all other Tax  Returns  that are  required  to be filed by the  Company  and the
Subsidiaries  for all Pre-Closing Tax Periods,  and Seller or, after the Closing
Date, Purchaser shall file or cause to be filed when due such other Tax Returns.
At least five  business  days prior to the date on which the Taxes shown on such
other Tax Returns are required to be paid,  Seller shall provide  Purchaser with
the funds for the payment of all Taxes unpaid as of the Closing Date shown to be
due on such other Tax Returns and Purchaser shall be responsible for the payment
of all Taxes  unpaid as of the  Closing  Date  shown to be due on such other Tax
Returns,  provided that Purchaser's obligation to pay such Taxes shall not limit
Purchaser's  indemnification  rights against Seller  pursuant to Section 8.9. If
any such Tax Return shows an overpayment  of Taxes due,  Seller may credit (upon
written  notice to  Purchaser  to that  effect)  the amount of such  overpayment
against any payment  otherwise due from Seller to Purchaser under this Agreement
and any  amount  of the  overpayment  not so  credited  shall be  reimbursed  by
Purchaser to Seller no later than five  business days after the later of receipt
by Purchaser of Seller's  written request for  reimbursement  and the earlier of
Purchaser's  receipt  of a  refund  on  account  of  such  overpayment  and  the
application  of such  overpayment  to offset a Tax  liability of Purchaser or an
Affiliate of Purchaser otherwise due.

     (c) Purchaser shall prepare and file all Tax Returns of the Company and the
Subsidiaries for all Post-Closing Tax Periods. As promptly as practicable but at
least five business  days before the due date,  Purchaser  shall furnish  Seller
with  copies of all Tax  Returns of the  Company  and the  Subsidiaries  for any
Post-Closing  Tax Period that  includes the Closing Date. At least five business
days prior to the date on which the Taxes shown on such Tax Return are  required
to be paid,  Seller shall  provide  Purchaser  with funds for the payment of all
Taxes  shown  to be due  on  such  Tax  Returns  that  are  attributable  to the
Pre-Closing Tax Period and Purchaser shall be responsible for the payment of all
Taxes shown to be due on such Tax Returns,  provided that Purchaser's obligation
to pay such Taxes shall not limit  Purchaser's  indemnification  rights  against
Seller pursuant to Section 8.9.

     8.6 Other Tax Matters.  (a) All transfer,  documentary,  sales, use, stamp,
and registration  Taxes and fees (including any penalties and interest) incurred
in connection with this Agreement, shall be paid one-half by Seller and one-half
by Buyer when due, and each party will,  at its own expense,  file all necessary
Returns and other documentation with respect to all such transfer,  documentary,
sales, use, stamp, registration and other taxes and fees.

     (b)Certification  to the effect  that  Seller is not a "foreign  person" as
defined in Section  1445 of the Code shall be signed by Seller and  delivered to
Purchaser prior to the Closing.

     8.7  Cooperation on Tax Matters.  (a) Purchaser and Seller shall  cooperate
fully,  as and to the  extent  reasonably  requested  by  the  other  party,  in
connection with any audit, litigation

                                       27





or other  proceeding  with  respect  to Taxes  and with the  preparation  of any
Returns.  Such  cooperation  shall  include  the  retention  and (upon the other
party's  request) the provision of records and information  which are reasonably
relevant to any such audit,  litigation or other proceeding and making employees
available on a mutually  convenient basis to provide additional  information and
explanation of any material provided hereunder. The Company and Seller agree (i)
to retain all books and records  with  respect to Tax matters  pertinent  to the
Company and its  Subsidiaries  relating to any  Pre-Closing  Tax Period,  and to
abide by all record retention agreements entered into with any Taxing Authority,
and  (ii)  to  give  the  other  party   reasonable   written  notice  prior  to
transferring,  destroying or  discarding  any such books and records and, if the
other party so  requests,  the Company or Seller,  as the case may be, shall not
destroy or discard  such books and  records  and shall  allow the other party to
take possession of such books and records.

     (b)Purchaser  and Seller  further  agree,  upon request,  to use their best
efforts  to obtain  any  certificate  or other  document  from any  governmental
authority  or customer of the Company or any  Subsidiary  or any other Person as
may be necessary to mitigate,  reduce or eliminate any Tax that could be imposed
(including,  but not limited to, with respect to the  transactions  contemplated
hereby).

     (c)Purchaser and Seller further agree,  upon request,  to provide the other
party with all information  that either party may be required to report pursuant
to section 6043 of the Code and all Treasury Regulations promulgated thereunder.

     8.8 Certain  Disputes.  Disputes  arising  under this  Article VIII and not
resolved by mutual  agreement as stated herein shall be resolved by a nationally
recognized  accounting firm with no affiliation or relationship  whatsoever with
Purchaser,  Seller or their  Affiliates (the  "Accounting  Referee")  chosen and
mutually  acceptable  to both  Purchaser and Seller within five business days of
the  date on  which  the need to  choose  the  Accounting  Referee  arises.  The
Accounting Referee shall resolve any disputed items within 30 days of having the
item referred to it pursuant to such  procedures  as it may require.  The costs,
fees and expenses of the Accounting  Referee shall be borne equally by Purchaser
and Seller.

     8.9 Tax Indemnification. (a) The covenants, agreements, representations and
warranties  of the  parties  hereto  contained  in this  Article  VIII or in any
certificate  or other  writing  delivered  pursuant to this  Article  VIII or in
connection  herewith  shall survive the Closing until February 28, 1999 or until
expiration of the applicable statutory period of limitation, if later.

     (b) Seller hereby indemnifies the Purchaser Indemnified Parties against and
agrees  to hold  them  harmless  from  (i) any  (x)  Tax of the  Company  or any
Subsidiary and (y) liabilities,  costs, expenses (including,  without limitation
reasonable expenses of investigation and attorneys' fees and expenses),  losses,
damages, assessments, settlements or judgments arising out of or incident to the
imposition, assessment or assertion of any Tax, and any liability as transferee,
in each case related to the Tax Indemnification Period and in each case incurred
or suffered by Purchaser,  any of its Affiliates or, effective upon the Closing,
the Company or any Subsidiary; and

                                       28





(ii) any and all  Damages  incurred or  suffered  by the  Purchaser  Indemnified
Parties arising out of any misrepresentation or breach of warranty,  covenant or
agreement  made or to be performed by Seller  pursuant to this Article VIII. The
indemnification  set forth in the  preceding  sentence  shall not apply to or in
respect of Taxes of the Company or any  Subsidiary to the extent that such Taxes
were funded by a payment by Seller to Purchaser  pursuant to Sections  8.5(b) or
8.5(c).  Purchaser hereby indemnifies the Seller Indemnified Parties against and
agrees to hold them  harmless  from any and all Damages  incurred or suffered by
the Seller Indemnified Parties arising out of any misrepresentation or breach of
warranty, covenant or agreement made or to be performed by Purchaser pursuant to
this Article VIII.

     (c)For  purposes  of Section 8.5 and this  Section  8.9, in the case of any
Taxes that are imposed on a periodic  basis and are payable for a taxable period
that includes  (but does not end on) the Closing  Date,  the portion of such Tax
related to the portion of such taxable  period  ending on the Closing Date shall
(x) in the case of any Taxes  other than Taxes  based upon or related to income,
be deemed to be the amount of such Tax for the entire taxable period  multiplied
by a fraction the numerator of which is the number of days in the taxable period
ending on the Closing Date and the denominator of which is the number of days in
the entire taxable period,  and (y) in the case of any Tax based upon or related
to income be deemed  equal to the amount  which would be payable if the relevant
taxable  period  ended on the Closing  Date.  Any credits  relating to a taxable
period  that begins  before and ends after the Closing  Date shall be taken into
account as though the relevant  taxable  period ended on the Closing  Date.  All
determinations  necessary to give effect to the foregoing  allocations  shall be
made  in a  manner  consistent  with  prior  practice  of the  Company  and  its
Subsidiaries.

     (d)Purchaser agrees to give prompt notice to Seller of the assertion of any
claim, or the commencement of any suit, action or proceeding in respect of which
indemnity may be sought hereunder,  which Purchaser deems to be within the ambit
of this Section 8.9 (specifying with  particularity the basis therefor) and will
give Seller such information with respect thereto as Seller may request.  Seller
may, at its own expense,  (i) participate in and, (ii) upon notice to Purchaser,
assume the defense of any such suit,  action or  proceeding;  provided that, (y)
Seller shall  thereafter  consult with  Purchaser  upon  Purchaser's  reasonable
request  for such  consultation  from time to time with  respect  to such  suit,
action or  proceeding  and (z) Seller shall not,  without  Purchaser's  consent,
which consent shall not be unreasonably  withheld,  agree to any settlement with
respect to any Tax if such  settlement  could  materially  adversely  affect the
past,  present or future Tax liability of Purchaser,  any of its  Affiliates or,
upon the Closing, the Company or any Subsidiary. If Seller assumes such defense,
Purchaser  shall have the right (but not the duty) to participate in the defense
thereof and to employ  counsel,  at its own expense,  separate  from the counsel
employed by Seller.  Whether or not Seller  chooses to defend or  prosecute  any
claim,  all of the parties hereto shall  cooperate in the defense or prosecution
thereof.

     (e)Seller agrees to give prompt notice to Purchaser of the assertion of any
claim, or the commencement of any suit, action or proceeding in respect of which
indemnity may be sought  hereunder  which Seller deems to be within the ambit of
this Section 8.9 (specifying with

                                       29





particularity  the basis therefor) and will give Purchaser such information with
respect thereto as Purchaser may request. Purchaser may, at its own expense, (i)
participate  in and, (ii) upon notice to Seller,  assume the defense of any such
suit,  action or  proceeding;  provided  that,  (y) Purchaser  shall  thereafter
consult with Seller upon Seller's  reasonable request for such consultation from
time to time with respect to such suit,  action or proceeding  and (z) Purchaser
shall not,  without  Seller's  consent,  which consent shall not be unreasonably
withheld,  agree to any  settlement  with respect to any Tax if such  settlement
could materially  adversely affect the past,  present or future Tax liability of
Seller or any of its Affiliates. If Purchaser assumes such defense, Seller shall
have the right (but not the duty) to participate  in the defense  thereof and to
employ  counsel,  at its own  expense,  separate  from the  counsel  employed by
Purchaser.  Whether or not  Purchaser  chooses to defend or prosecute any claim,
all of the parties hereto shall cooperate in the defense or prosecution thereof.

     (f)Seller  shall not be liable  under this  Section 8.9 with respect to any
Tax resulting from a claim or demand the defense of which it was not offered the
opportunity  to assume as provided  under  Section  8.9(d)  hereof to the extent
Seller's  liability  under  Section  8.9(a) is  adversely  affected  as a result
thereof.  No  investigation by Purchaser or any of its Affiliates at or prior to
the Closing Date shall relieve Seller of any liability hereunder.

     (g)  Purchaser  shall not be liable  under this Section 8.9 with respect to
any Tax resulting from a claim or demand the defense of which it was not offered
the  opportunity to assume as provided under Section 8.9(e) hereof to the extent
Purchaser's  liability  under Section  8.9(a) is adversely  affected as a result
thereof.  No investigation by Seller or any of its Affiliates at or prior to the
Closing Date shall relieve Purchaser of any liability hereunder.

     (h) Any amounts owed by any party to any other party under this Section 8.9
shall be paid  within 10  business  days of notice  from such other  party.  Any
amounts  which are not paid within such 10-day  period shall accrue  interest at
the monthly "Federal  Short-Term  Rate" under Section  1274(d)(1)(C) of the Code
applicable to any period for which such intent is payable.

     (i) The indemnification  provided for hereunder shall not be subject to the
provisions  of  Article  XI  and  shall   constitute  a  separate  and  distinct
indemnification obligation of the parties hereto.

                                   ARTICLE IX

                                Employee Benefits

     9.1 Employee  Benefits  Definitions.  The following  terms, as used herein,
have the following meanings:

     "Benefit Arrangement" means any employment,  severance or similar contract,
arrangement  or  policy,  or any plan or  arrangement  providing  for  severance
benefits, insurance coverage (including any self-insured arrangements), workers'
compensation,  disability benefits, supplemental unemployment benefits, vacation
benefits, retirement benefits, deferred compensation, profit-sharing,

                                       30





bonuses,  stock options,  stock appreciation  rights or other forms of incentive
compensation or post-retirement insurance,  compensation or benefits that (i) is
not an Employee Plan and (ii) is entered into or maintained, as the case may be,
by the Seller or any of its ERISA  Affiliates  and (iii)  covers any employee or
former employee of the Company or any Subsidiary of the Company.

     "ERISA" means the Employee Retirement Income Security Act of 1974.

     "ERISA Affiliate" of any entity means any other entity which, together with
such  entity,  would be treated as a single  employer  under  Section 414 of the
Code.

     "Individual  Account Plan" means the Aetna  Incentive  Savings Plan and the
U.S. Healthcare Savings Plan.

     "Multiemployer Plan" means each Employee Plan that is a multiemployer plan,
as defined in Section 3(37) of ERISA.

     "PBGC" means the Pension Benefit Guaranty Corporation.

     "Pension Plan" means the Pension Plan for Employees of Aetna Services, Inc.
and the Pension Plan for Employees of U.S. Healthcare.

     "Title IV Plan" means an Employee Plan, other than any Multiemployer  Plan,
subject to Title IV of ERISA.

     9.2. ERISA  Representations.  (a) Section 9.2(a) of the Disclosure Schedule
is an accurate and complete list of each "employee  benefit plan", as defined in
Section 3(3) of ERISA,  that (i) is subject to any  provision of ERISA,  (ii) is
maintained,  administered  or  contributed  to by the Seller or any of its ERISA
Affiliates  and (iii) covers any  employee or former  employee of the Company or
any Subsidiary.  Such plans are hereinafter referred to as the "Employee Plans".
Seller has furnished or made  available to Purchaser  copies of such plans (and,
if applicable,  related trust agreements) and all amendments thereto and written
interpretations thereof together with (i) the most recent annual report prepared
in connection  with any such plan (Form 5500 including  accompanying  schedules)
and (ii) if applicable,  the most recent actuarial  valuation report prepared in
connection  with  any such  plan.  Section  9.2(a)  of the  Disclosure  Schedule
identifies each Employee Plan that is a Title IV Plan.

     (b) Neither the Seller nor any ERISA  Affiliate  of Seller has incurred any
liability under Title IV of ERISA arising in connection with the termination of,
or complete or partial  withdrawal from, any plan covered or previously  covered
by Title IV of ERISA that could  become a liability  of the  Purchaser or any of
its ERISA Affiliates after the Closing Date.

     (c) Each  Employee  Plan that is intended  to be  qualified  under  Section
401(a)  of the Code and  each  amendment  thereto,  has been  determined  by the
Internal Revenue Service to be so qualified and no such  determination  has been
revoked  and  no  plan  amendment  that  is  not  the  subject  of  a  favorable
determination  letter would affect the qualification of the plan or the validity
of the plan's favorable determination letter. Seller has provided Purchaser with
the most recent  determination  letters of the Internal Revenue Service relating
to each such Employee Plan. Each Employee Plan has been

                                       31





maintained in substantial  compliance  with its terms and with the  requirements
prescribed by any and all applicable  statutes,  orders,  rules and regulations,
including but not limited to ERISA and the Code.
No Employee Plan is a Multiemployer Plan.

     (d) Section 9.2(d) of the  Disclosure  Schedule is an accurate and complete
list of each Benefit  Arrangement.  Seller has  furnished  or made  available to
Purchaser copies of each Benefit Arrangement.  Each Benefit Arrangement has been
maintained in substantial  compliance  with its terms and with the  requirements
prescribed by any and all applicable statutes, orders, rules and regulations.

     (e) Except as set forth in Section 9.2(e) of the Disclosure Schedule, there
is no contract, agreement, plan or arrangement with respect to which the Company
or any  Subsidiary  has any  liability  that  provides  for the  payment  to any
employee  or former  employee  of the  Company  or any  Subsidiary  of more than
$75,000 in any calendar year.

     (f) Except as set forth in Section  9.2(f) of the Disclosure  Schedule,  no
employee  or former  employee  of the  Company or any of its  Subsidiaries  will
become  entitled to any bonus,  retirement,  severance,  job security or similar
benefit solely as a result of the transactions contemplated hereby.

     (g) Except as set forth in Section  9.2(g) of the Disclosure  Schedule,  to
the knowledge of Seller, there are no governmental inspections,  investigations,
audits or  examinations  currently  pending or  threatened  with  respect to any
Employee Plan or Benefit  Arrangement.  There exists no material action, suit or
claim (other than routine claims for benefits) with respect to any Employee Plan
or Benefit  Arrangement pending or to the knowledge of Seller threatened against
any of such plans or arrangements.

     (h)  Except as to  matters  described  in  Section  3.10 of the  Disclosure
Schedule,  to the knowledge of Seller,  there are no facts or events,  including
the consummation of the transaction  contemplated by this Agreement,  that could
lead to the imposition of any material  liability on the Purchaser or any of its
ERISA  Affiliates,  of  whatever  nature  including  the  provision  of employee
benefits  with  respect  to the  employment  of any  employees  of Seller or its
Subsidiaries who are not Transferred Employees.

     (i) Except as provided in Section  9.6(a),  all  material  benefits due and
payable to any of the Transferred Employees under the Employee Plans and Benefit
Arrangements  as of the Closing Date will be paid thereto by or on behalf of the
Seller.

     9.3.  Employees.  On or prior to the  Closing  Date,  Seller will cause all
employees  of the  Seller  or any of its  Subsidiaries  identified  by Seller on
Section 9.3 of the  Disclosure  Schedule  (by name and job title) as  performing
substantially  all of their  services to the Company's  business units to become
employees  of the  Company  or one of its  Subsidiaries.  With  respect  to each
individual  who, as of the Closing Date, is employed  (including  persons absent
from  active  service for any reason,  including,  but not limited to,  illness,
disability,  family and medical leave or other leave of absence, whether paid or
unpaid) by the Company or any of its  Subsidiaries or is otherwise  described in
Section 9.3 of the Disclosure Schedule ("Transferred  Employees"),  Purchaser or
one of its Affiliates  shall  continue the  employment of each such  Transferred
Employee, and provide each such Transferred Employee with at

                                       32





least the level of base  salary per annum as in effect on the  Closing  Date for
such Transferred Employee, in each case for the longer of (i) three months after
the Closing Date and (ii) the remainder of the calendar year ending December 31,
1997.  Nothing  in this  Section  9.3 is  intended  to, or shall,  require  such
employer to employ a  Transferred  Employee on a basis other than as an employee
at will.

     9.4.  Pension Plan.  Seller and its Affiliates shall retain all liabilities
and obligations in respect of benefits accrued by both Transferred Employees and
former employees of the Company and its Subsidiaries  under the Pension Plan. No
Pension Plan assets shall be  transferred  to Purchaser or any of its Affiliates
or to any  plan of  Purchaser  or its  Affiliates.  It is  understood  that  the
Transferred  Employees will be fully vested in their accrued  benefits under the
Pension Plan as of the Closing Date.

     9.5.  Individual  Account  Plan.  Seller shall retain all  liabilities  and
obligations in respect of benefits  accrued by Transferred  Employees  under the
Individual  Account Plan. It is understood  that the  Transferred  Employees are
fully vested (or will become fully vested) in their account  balances  under the
Individual  Account Plan. On the Closing Date,  Seller shall take such action as
may be necessary,  if any, to permit each  Transferred  Employee to exercise his
rights  under  the  Individual  Account  Plan to effect a  distribution  of such
Transferred Employee's vested account balances under the Individual Account Plan
or to effect a tax-free  rollover of the taxable portion of the account balances
into an  eligible  retirement  plan,  if any,  (within  the  meaning  of Section
401(a)(31)  of the Code,  a "Direct  Rollover")  maintained  by  Purchaser  or a
subsidiary of Purchaser (the  "Purchaser  Plan") or to an individual  retirement
account.  Seller and Purchaser  shall work  together in order to facilitate  any
such  distribution  or  rollover  and to  effect a  Direct  Rollover  for  those
participants  who elect to roll over their  account  balances  directly into the
Purchaser  Plan in  accordance  with the terms and  conditions  of the Purchaser
Plan;  provided that nothing  contained herein shall obligate the Purchaser Plan
to accept a Direct  Rollover in a form other than cash or obligate  Purchaser to
establish or maintain a Purchaser Plan.

     9.6.  Other Employee Plans and Benefit  Arrangements.  (a) Purchaser  shall
assume and be liable for, and,  where  appropriate,  shall cause the Company and
its  Subsidiaries  to perform  all  obligations  in  respect of the  Transferred
Employees under the employee  agreements and  arrangements  described in Section
9.6(a)  of the  Disclosure  Schedule  (which  by  execution  of this  Agreement,
Purchaser or the Company,  as  applicable,  expressly  assumes as of the Closing
Date). Except to the extent specifically set forth herein and in Section 9.9, it
is understood  that  Purchaser  shall not assume and shall not be liable for any
obligations, responsibilities or liabilities under the Employee Plans or Benefit
Arrangements of Seller.

     (b) Subject to the provisions of Section 9.6(a),  and except as provided in
Sections 9.4 and 9.5,  Purchaser  shall assume and be liable for all liabilities
(including legal costs and fees) involving any Transferred  Employee relating to
any claim arising under any federal, state or local statute (including,  without
limitation,  Title VII of the Civil Rights Act of 1964,  the Civil Rights Act of
1991, the Age  Discrimination  in Employment Act of 1967, the Equal Pay Act, the
Americans  with  Disabilities  Act of 1990,  the Fair Labor  Standards  Act, the
Family and Medical Leave Act, and all other  statutes  regulating  the terms and
conditions of employment),  regulation,  executive order or ordinance, under the
common  law or in  equity  (including  any  claims  for  wrongful  discharge  or
otherwise), or under any policy, agreement, understanding or promise, written or
oral,  formal or  informal,  between  the  Company  or any  Subsidiary  and such
Transferred  Employee,  including  all such  liabilities  that  relate to events
occurring  on or  prior to the  Closing  Date or which  arise by  reason  of the
transactions contemplated by

                                       33





this Agreement.  Nothing in the immediately  preceding sentence shall affect the
indemnification  rights that the parties would otherwise be entitled pursuant to
Article XI of this Agreement.

     (c) For the  calendar  year in which the Closing  Date  falls,  Transferred
Employees  shall be eligible to accrue the number of  vacation  days  calculated
under the Company's  vacation policy in effect  immediately prior to the Closing
Date,  a copy of which is attached to this  Agreement  as Section  9.6(c) of the
Disclosure Schedule.  Subject to Purchaser's policies and procedures  respecting
vacation time, so long as a Transferred  Employee is employed by the Company,  a
Subsidiary or any Affiliate of Purchaser, such Transferred Employee shall accrue
at least as many  vacation days as such person was scheduled to accrue under the
Company's  vacation policy as of the beginning of such calendar year.  Purchaser
will assume the vacation  liability  accrued by Transferred  Employees as of the
Closing Date in a manner consistent with the Company's existing policy as of the
date hereof.

     9.7. Plans Following the Closing.  (a) For the period from the Closing Date
through the date 12 months  after the  Closing  Date,  Purchaser  will cause the
Company to maintain  employee  benefit plans and arrangements for the benefit of
the Transferred Employees that are substantially  comparable in the aggregate to
the  Employee  Plans.  Notwithstanding  the  foregoing,  Purchaser  shall not be
obligated  or  required to  establish  or  maintain a defined  benefit  plan (as
defined in ERISA  Section  3(35) or Code Section  414(j)) for the benefit of any
Transferred  Employee.  Purchaser  will cause the  Company  to give  Transferred
Employees  full  credit for all  purposes,  including  eligibility,  vesting and
benefit accrual, under any such plans or arrangements  maintained by the Company
pursuant to this Section 9.7 for such Transferred  Employees' service recognized
for such purposes under the Employee Plans and Benefit Arrangements.

     (b) Without  limiting the generality of the foregoing,  for the period from
the Closing Date through the date 12 months  after the Closing  Date,  Purchaser
will maintain and make available to Transferred  Employees (i) medical,  dental,
and short-term disability plans that are substantially  comparable to the Seller
plans  identified in Section  9.7(b)(i) of the Disclosure  Schedule  without any
increase in required  contributions  by  Transferred  Employees  for  comparable
benefits in  accordance  with  Section 9.8 and (ii) a severance  package that is
identical to the Seller  severance plan  described in Section  9.7(b)(ii) of the
Disclosure Schedule.

     (c) For the period  beginning on the date 12 months after the Closing Date,
Purchaser  shall  provide  benefit  plans  and  programs  that  are at  least as
favorable as such plans and programs  that are  available to other  employees of
the Purchaser and its Affiliates generally and give Transferred Employees credit
for  service  with  Seller and any of its  affiliates  as well as  service  with
Purchaser  and any of its  Affiliates  for all purposes  including  eligibility,
vesting, and benefit accrual.

     (d)  Purchaser  shall cause any  Transferred  Employee who is on short-term
disability on the Closing Date to receive without  interruption on and after the
Closing Date short-term disability benefits provided by Purchaser  substantially
identical  to the  short-term  disability  benefits  provided  by Seller for the
Transferred  Employee.  Seller shall have no liability to Purchaser with respect
to such  benefits  provided by Purchaser.  If a Transferred  Employee who was on
short-term  disability  on the Closing Date  subsequently  becomes  eligible for
coverage  and  receives  benefits  under  Seller's  long-term  disability  plan,
Purchaser  shall have no  liability  to Seller  with  respect to such  long-term
disability coverage.

                                       34





     9.8. Medical and Dental Insurance  Coverage.  (a) Purchaser shall cause all
employee  health  and  dental  plans  in  which  Transferred   Employees  become
participants  on or after the  Closing  Date to waive  any and all  pre-existing
condition  exclusions and waiting period  requirements and to recognize,  to the
extent such participation  commences other than at the beginning of a plan year,
expenses  previously  incurred for the period from the beginning of the calendar
year in which  the  Closing  Date  falls to the  Closing  Date for  purposes  of
applicable  deductible  rules to the extent such expenses are  recognized  under
Purchaser's plans in effect  immediately prior to the Closing Date. In addition,
Purchaser will continue short-term  disability benefits under the Company's sick
pay plan for any Transferred  Employee receiving such benefits as of the Closing
Date for so long as such Transferred Employee remains eligible for such benefits
(not to exceed 26 weeks).  Through the date 12 months  after the  Closing  Date,
Transferred  Employees  shall not be required to make  contributions  toward the
cost of the  applicable  coverage under  Purchaser's  health and dental plans in
excess of the  monthly  amounts,  if any,  they would have been  required to pay
under Seller's medical and dental insurance plans prior to the Closing Date.

     (b) For the period from the Closing  Date  through the date 12 months after
the Closing Date,  Purchaser agrees that in respect of any Transferred  Employee
who as of the Closing  Date is involved in a course of treatment  covered  under
Seller's  medical plans,  Purchaser  shall take no action in connection with the
continuation  of, or  establishment  of, coverage of such  Transferred  Employee
under Purchaser medical plans which will cause such Transferred Employee to have
to alter such  course of  treatment,  including  but not limited to, a change in
physician  or  location  of  covered  treatment,  in order  for such  course  of
treatment to be covered under the applicable Purchaser medical plan.

     9.9. Assumption of Liabilities. Except as otherwise provided in Section 9.4
or 9.5 or elsewhere  herein,  Purchaser agrees that,  effective on and after the
Closing  Date,  the Company and its  Subsidiaries  shall have all  liability and
responsibility  with respect to the  Transferred  Employees and Seller shall not
retain any, and shall not be deemed to have  retained  any, of such  liabilities
and responsibilities.  With respect to Transferred Employees,  and except to the
extent  provided in Section  9.6(a),  Seller shall retain those  obligations and
liabilities   relating  to  or  arising  under  any  Employee  Plan  or  Benefit
Arrangement that are attributable to benefits accrued or otherwise payable on or
prior to the  Closing  Date and are not  accrued as a  liability  on the Closing
Balance  Sheet and that  either  (i) are with  respect  to an  Employee  Plan or
Benefit  Arrangement set forth in Section 9.9 of the Disclosure Schedule or (ii)
arise  from   claims,   including   claims   challenging   the   administration,
interpretation,  or statutory or  regulatory  compliance  of an Employee Plan or
Benefit  Arrangement,  that are not routine  claims for benefits in the ordinary
course of operation of the Employee Plan or Benefit  Arrangement.  Except to the
extent  provided in the preceding  sentence or in Section 9.4 or 9.5,  Purchaser
shall, as of the Closing Date,  assume all obligations and liabilities of Seller
and any of its  Affiliates  in  respect  of  Transferred  Employees  under  each
Employee  Plan and Benefit  Arrangement;  provided  that,  except as provided in
Section 9.6 or 9.7,  nothing  contained  herein shall constitute a commitment or
obligation  on the part of  Purchaser  to  continue  any such  Employee  Plan or
Benefit Arrangement after the Closing Date.

    9.10 Third Party Beneficiaries. No provision of this Article IX shall create
any third party  beneficiary  rights in any  employee or former  employee of the
Company (including any beneficiary or dependent thereof) in respect of continued
employment  or resumed  employment,  and no  provision  of this Article IX shall
create any rights in any such persons in respect of any benefits that may be

                                       35





provided,   directly  or   indirectly,   under  any  Employee  Plan  or  Benefit
Arrangement.

                                    ARTICLE X

                              Conditions To Closing

     10.1 Conditions to Obligations of Each Party.  The obligations of Purchaser
and Seller to  consummate  the Closing are  subject to the  satisfaction  of the
following conditions:

          (a) Any  applicable  waiting  period under the HSR Act relating to the
     transactions contemplated hereby shall have expired or been terminated.

          (b) No provision of any  applicable law or regulation and no judgment,
     injunction, order or decree shall prohibit the consummation of the Closing,
     and no  proceeding  challenging  this  Agreement  or seeking  to  prohibit,
     prevent or materially  alter or delay,  or materially  impair the value of,
     the  transactions  contemplated  hereby shall have been  instituted  by any
     governmental body, agency or authority having proper jurisdiction and shall
     be pending.

          (c) All  actions by,  authorizations,  consents  or  approvals  of, or
     filings with any governmental body, agency,  official or authority required
     in order to permit the  consummation  of the Closing  shall have  occurred,
     been filed or been obtained.

     10.2 Conditions to Obligation of Purchaser.  The obligation of Purchaser to
consummate the Closing is subject to the  satisfaction of the following  further
conditions:

          (a)(i)Seller  shall have performed in all material respects all of its
     obligations  hereunder  required to be  performed  by it on or prior to the
     Closing Date, (ii) the  representations  and warranties of Seller contained
     in this Agreement shall be true and correct as of the Closing Date with the
     same effect as though such  representations and warranties had been made on
     and as of such time, other than  representations  and warranties that speak
     as of a specific  date or time  (which  need only be true and correct as of
     such date or time);  provided  that the  condition set forth in this clause
     (ii)  shall be deemed  satisfied  if the  facts,  events  or  circumstances
     underlying any inaccuracies in any such  representations  and warranties as
     of  the  Closing   Date   (without   giving   effect  to  any   materiality
     qualifications or materiality  exceptions contained therein),  individually
     or in the  aggregate,  could not  reasonably be expected to have a material
     adverse  effect on the business,  properties or financial  condition of the
     Company and the  Subsidiaries  taken as a whole and (iii)  Purchaser  shall
     have  received a  certificate  duly  executed by an  authorized  officer of
     Seller to the foregoing effect.

                                       36





          (b)  Purchaser  shall have  received the stock books,  stock  ledgers,
     minute books and corporate seal of the Company and the Subsidiaries.

          (c) Purchaser shall have received with respect to the Company and each
     Subsidiary  (i) a copy of its  certificate  or articles  of  incorporation,
     including  all  amendments,  certified  by the  Secretary of State or other
     appropriate  official of the  jurisdiction  of its  incorporation  and (ii)
     certificates from the Secretary of State or other  appropriate  official of
     the jurisdiction of its  incorporation to the effect that such person is in
     good  standing  or  subsisting  in such  jurisdiction,  listing all charter
     documents of such person on file.

          (d)  Purchaser  shall have received a  certificate,  dated the Closing
     Date  and  executed  by the  Secretary  or an  Assistant  Secretary  of the
     Company, in form and substance customary for transactions of this type.

          (e)  Purchaser  shall have received (i) a copy of the  certificate  or
     articles of incorporation, including all amendments, of Seller certified by
     the  Secretary  of State  or other  appropriate  official  of the  State of
     Connecticut  and (ii)  certificates  from the  Secretary  of State or other
     appropriate  official of the State of Connecticut to the effect that Seller
     is in good standing or subsisting in such jurisdiction, listing all charter
     documents of Seller on file.

          (f)  Purchaser  shall have received a  certificate,  dated the Closing
     Date and executed by the Secretary or an Assistant  Secretary of Seller, in
     form and substance customary for transactions of this type.

          (g)  Aetna  U.S.   Healthcare   Inc.,   a   Pennsylvania   corporation
     ("Guarantor"), shall have executed and delivered to Purchaser the Guaranty,
     substantially in the form attached as Exhibit A.

          (h)  Guarantor  shall have  executed and  delivered  to Purchaser  the
     Master Service  Agreement,  substantially in the form attached as Exhibit B
     (the "Master Agreement").

          (i)  Guarantor  shall have  executed and  delivered  to Purchaser  the
     Transition Services Agreement,  substantially in the form of Exhibit C (the
     "Transition Services Agreement").

          (j)  Guarantor  or one of  its  Affiliates  shall  have  executed  and
     delivered  to  Purchaser  the  HMO  and  non-HMO  health  care  agreements,
     substantially  in  the  form  of  the  applicable  Exhibit  to  the  Master
     Agreement.

          (k)  Guarantor  shall have  executed and  delivered  to Purchaser  the
     Non-Competition Covenant, substantially in the form of Exhibit D.

                                       37





          (l)  Since  the date of this  Agreement,  there  has been no  material
     adverse change in the business,  assets, condition (financial or otherwise)
     or results of  operations  of the Company and the  Subsidiaries  taken as a
     whole  (other  than as a  result  of  changes  (i) in  general  conditions,
     including laws and  regulations,  applicable to the  behavioral  healthcare
     industry or (ii) in general economic conditions).

          (m) The essential  software  without which the business of the Company
     and the  Subsidiaries  could not operate in the ordinary  course  listed on
     Section 10.2(m) of the Disclosure  Schedule (or its functional  equivalent)
     being  available  for license by Purchaser  or the Company on  commercially
     reasonable terms.

     10.3  Conditions  to  Obligation  of Seller.  The  obligation  of Seller to
consummate the Closing is subject to the  satisfaction of the following  further
conditions:

          (a)(i)Purchaser  shall have performed in all material  respects all of
     its obligations hereunder required to be performed by it on or prior to the
     Closing  Date,  (ii)  the   representations  and  warranties  of  Purchaser
     contained  in this  Agreement  shall be true and  correct as of the Closing
     Date with the same effect as though such representations and warranties had
     been made on and as of such time, other than representations and warranties
     that  speak as of a  specific  date or time  (which  need  only be true and
     correct as of such date or time);  provided that the condition set forth in
     this  clause  (ii)  shall be  deemed  satisfied  if the  facts,  events  or
     circumstances  underlying any inaccuracies in any such  representations and
     warranties as of the Closing Date (without giving effect to any materiality
     qualifications or materiality  exceptions contained therein),  individually
     or in the  aggregate,  could not  reasonably be expected to have a material
     adverse  effect on the business,  properties or financial  condition of the
     Purchaser and it subsidiaries  taken as a whole and (iii) Seller shall have
     received a certificate duly executed by an authorized  officer of Purchaser
     to the foregoing effect.

          (b)  Seller  shall  have  received  (i) a copy of the  certificate  or
     articles of incorporation, including all amendments, of Purchaser certified
     by the Secretary of State or other appropriate official of the jurisdiction
     of Purchaser's  incorporation  and (ii)  certificates from the Secretary of
     State or other  appropriate  official of the  jurisdiction  of  Purchaser's
     incorporation  to  the  effect  that  Purchaser  is  in  good  standing  or
     subsisting in such jurisdiction, listing all charter documents of Purchaser
     on file.

          (c) Seller shall have received a  certificate,  dated the Closing Date
     and executed by the Secretary or an Assistant  Secretary of  Purchaser,  in
     form and substance customary for transactions of this type.

          (d) The Company shall have executed and delivered to

                                       38





         Guarantor the Transition Services Agreement.

          (e)  Purchaser  and the Company  shall have  executed and delivered to
     Guarantor the Master Agreement.

          (f) The  Company  or one of its  Affiliates  shall have  executed  and
     delivered  to  Guarantor  the  HMO  and  non-HMO  health  care  agreements,
     substantially  in  the  form  of  the  applicable  Exhibit  to  the  Master
     Agreement.

          (g)  Purchaser  shall  have  executed  and  delivered  to  Seller  the
     Guaranty, substantially in the form of the applicable Exhibit to the Master
     Agreement.

                                   ARTICLE XI

                            Survival; Indemnification

     11.1 Survival. The covenants, agreements, representations and warranties of
the parties hereto  contained in this  Agreement or in any  certificate or other
writing  delivered  pursuant hereto or in connection  herewith shall survive the
Closing until the later of (x) the 12 month  anniversary of the Closing Date and
(y) January 31, 1999 (the "Expiration Date") or (i) in the case of Sections 3.2,
3.5,  3.6(b) and (c), 3.13,  4.2, 4.5, 6.1, 6.3, 6.4, 6.5 and 6.6  indefinitely,
(ii) in case of Section 6.2, for the period set forth therein, (iii) in the case
of the  covenants,  agreements,  representations  and  warranties  contained  in
Article VIII, as set forth in Section 8.9(a),  (iv) in the case of covenants and
agreements  contained in Article IX, for the periods specified therein, or if no
period is specified,  then  indefinitely.  Notwithstanding  the  foregoing,  the
covenants  and  agreements  contained in this Article XI shall survive until the
Expiration Date,  except (i) as to any claims for, or any claims that may result
in,  Damages  for  which  indemnity  may  be  sought   hereunder  of  which  the
Indemnifying  Party  has  received  written  notice  (describing  the  claim  in
reasonable  detail) from the Indemnified  Party on or before the Expiration Date
in  which  case the  indemnity  obligation  for such  claim  shall  survive  the
Expiration  Date  or  (ii)  as to  any  representation,  warranty  or  agreement
expressly surviving the Expiration Date as set forth in this Section 11.1.

     11.2   Indemnification.   (a)  Seller  hereby  indemnifies  Purchaser  and,
effective at the Closing, without duplication, the Company and the Subsidiaries,
and their respective  directors,  officers,  shareholders,  employees and agents
(collectively,  the "Purchaser  Indemnified Parties") against and agrees to hold
them harmless from any and all damage,  loss,  liability and expense  (including
without   limitation   reasonable   expenses  of  investigation  and  reasonable
attorneys' fees and expenses in connection with any action,  suit or proceeding)
("Damages")  incurred or suffered by the Purchaser  Indemnified  Parties arising
out of (x) any  misrepresentation  or breach of warranty,  covenant or agreement
made or to be  performed  by  Seller  pursuant  to this  Agreement  (other  than
pursuant to Article VIII),  (y) the  litigation  identified in Item 3 of Section
3.10 of the Disclosure  Schedule or (z) the litigation  identified in Item 21 of
Section 3.10 of the Disclosure  Schedule;  provided that (i) except as set forth
in Section 11.1, the Purchaser  Indemnified  Parties shall not have any right to
be  indemnified  under,  nor shall they make any claim pursuant to, this Section
11.2(a) after the Expiration Date, (ii) the Purchaser  Indemnified Parties shall
not have any right to be indemnified under, nor shall they make any

                                       39





claim pursuant to, this Section 11.2(a) for any single claim for Damages of less
than $20,000 ("De Minimis  Claims"),  (iii) the  Purchaser  Indemnified  Parties
shall not have any right to be indemnified  under, nor shall they make any claim
pursuant to, this Section 11.2(a) unless the aggregate  amount of all Damages to
the  Purchaser  Indemnified  Parties  (other  than De  Minimis  Claims)  exceeds
$5,000,000,  in which case the Purchaser Indemnified Parties will be entitled to
indemnification  only to the extent to which such Damages (other than De Minimis
Claims) exceed $5,000,000 and (iv) Seller's maximum liability under this Section
11.2(a) shall not exceed the Closing  Payment,  as adjusted  pursuant to Section
2.4,  together with all amounts paid to Seller pursuant to the Master Agreement.
Notwithstanding  anything to the contrary set forth in the immediately preceding
sentence,  (1) Seller's  indemnification  obligations  pursuant to clause (y) of
such  sentence  shall not be  subject  to,  and shall  not  count  towards,  the
$5,000,000  deductible  described  in  clause  (iii) of such  sentence,  and (2)
although  Seller's  indemnification  obligations  pursuant to clause (z) of such
sentence  shall  be  subject  to,  and  shall  count  towards,  such  $5,000,000
deductible,  Seller  shall  be  obligated  to  undertake  the  defense  of  such
litigation,  through  counsel  of its own  choosing  (reasonably  acceptable  to
Purchaser)  at its own expense,  in  accordance  with the  provisions of Section
11.3.

     (b)Purchaser  hereby  indemnifies  Seller  and  its  directors,   officers,
shareholders,  employees  and  agents  (collectively,  the  "Seller  Indemnified
Parties")  against  and agrees to hold them  harmless  from any and all  Damages
incurred  or  suffered  by the Seller  Indemnified  Parties  arising  out of any
misrepresentation  or breach of warranty,  covenant or  agreement  made or to be
performed  by  Purchaser  pursuant to this  Agreement  (other  than  pursuant to
Article VIII); provided that (i) except as set forth in Section 11.1, the Seller
Indemnified  Parties shall not have any right to be indemnified under, nor shall
they make any claim pursuant to, this Section 11.2(b) after the Expiration Date,
(ii) the Seller  Indemnified  Parties shall not have any right to be indemnified
under,  nor shall they make any claim pursuant to, this Section  11.2(b) for any
De Minimis Claims, (iii) the Seller Indemnified Parties shall not have any right
to be indemnified under, nor shall they make any claim pursuant to, this Section
11.2(b)  unless the  aggregate  amount of all Damages to the Seller  Indemnified
Parties (other than De Minimis  Claims)  exceeds  $5,000,000,  in which case the
Seller  Indemnified  Parties  will be  entitled to  indemnification  only to the
extent to which such Damages (other than De Minimis  Claims)  exceed  $5,000,000
and (iv)  Purchaser's  maximum  liability  under this Section  11.2(b) shall not
exceed the Closing Payment,  as adjusted  pursuant to Section 2.4, together with
all amounts paid to Seller pursuant to the Master Agreement.

     (c)The amount of any and all Damages for which  indemnification is provided
pursuant  to  this  Article  XI  shall  be net of any  amounts  received  by the
Indemnified  Party under  insurance  policies  with  respect to such Damages (it
being understood that any proceeds  obtainable from a captive  insurance company
of the  Indemnified  Party or any  amounts  which the  Indemnified  Party  self-
insures  shall not be so taken  into  account).  In the event that any claim for
indemnification asserted under this Article XI is, or may be, the subject of the
Company's or any party's  hereto  insurance  coverages,  the  Indemnified  Party
agrees to promptly  notify the  applicable  insurance  carrier of such claim and
tender defense thereof to such carrier. Each Indemnified Party shall pursue such
claims  diligently  and shall  reasonably  cooperate  with  each such  insurance
carrier, and there shall be no payment obligation with respect to such claim for
indemnification  under this  Article XI for a period of one year after  making a
claim for such insurance. If insurance coverage is denied (in whole or in part),
or if no  resolution of an insurance  claim shall have occurred  within such one
year period, upon payment of the

                                       40





relevant indemnification  obligation, the Indemnifying Party shall be subrogated
to the rights of the Indemnified Party against such insurance carrier.

     11.3 Procedures;  Exclusivity.  (a) The party seeking indemnification under
Section 11.2 (the  "Indemnified  Party") agrees to give prompt written notice to
the party against whom indemnity is sought (the  "Indemnifying  Party")  setting
forth in reasonable  detail the assertion of any claim,  or the  commencement of
any suit,  action or  proceeding,  in respect of which  indemnity  may be sought
under such Section.  The Indemnifying  Party shall have 45 days after receipt of
such notice (or five days prior to such lesser  time period as is  permitted  by
applicable  law or  administrative  rule to contest  such  claim) to  undertake,
through  counsel of its own choosing and at its own expense,  the  settlement or
defense thereof, and the Indemnified Party shall cooperate with it in connection
therewith; provided, however, that the Indemnified Party may participate in such
settlement or defense through counsel chosen by such Indemnified Party, provided
that the fees and  expenses of such counsel  shall be borne by such  Indemnified
Party.  The  Indemnified  Party  shall  not pay or settle  any  claim  which the
Indemnifying Party is contesting in good faith.  Notwithstanding  the foregoing,
the  Indemnified  Party  shall have the right to pay or settle  any such  claim;
provided that the terms of such settlement are not materially prejudicial to the
Indemnifying Party, and that in such event the Indemnified Party shall be deemed
to have waived any right of indemnity therefor by the Indemnifying Party. If the
Indemnifying  Party does not notify the  Indemnified  Party within 45 days after
the receipt of the Indemnified  Party's notice of a claim of indemnity hereunder
(or five days prior to such lesser time period as is permitted by applicable law
or  administrative  rule to contest such claim) that it elects to undertake  the
defense thereof,  the Indemnified Party shall have the right to contest,  settle
or  compromise  the claim but shall  not  thereby  waive any right to  indemnity
therefor by the Indemnifying Party.

     (b) After the Closing,  Sections  8.9 and 11.2 will  provide the  exclusive
remedy by either party for any misrepresentation,  breach of warranty,  covenant
or  other  agreement  or  other  claim  arising  out of  this  Agreement  or the
transactions contemplated hereby.

     11.4  Investigation.  Any investigation made at any time by or on behalf of
any party hereto shall not diminish in any respect whatsoever such party's right
to rely on the  representations  and warranties made by any other party pursuant
to this Agreement.

                                   ARTICLE XII

                                   Termination

     12.1 Grounds for Termination.  This Agreement may be terminated at any time
prior to the Closing:

     (i) by mutual written agreement of Seller and Purchaser; or

     (ii) at any time after March 31, 1998, by Seller or Purchaser  upon written
notification  of the  non-terminating  party  by the  terminating  party  if the
Closing  shall not have  occurred  on or before  such date and such  failure  to
consummate is not caused by a breach of this Agreement by the terminating party.

                                       41





     12.2  Effect  of  Termination.  If this  Agreement  is  validly  terminated
pursuant  to  Section  12.1,  such  termination  shall be without  liability  or
obligation of either party (or any  shareholder,  director,  officer,  employee,
agent,  consultant or  representative  of such party) to the other party to this
Agreement;  provided  that if such  termination  shall  result  from the willful
failure  of  either  party to  fulfill a  condition  to the  performance  of the
obligations  of the other  party or to perform a covenant of this  Agreement  or
from a willful  breach by either  party to this  Agreement,  such party shall be
fully liable for any and all Damages  incurred or suffered by the other party as
a result of such failure or breach.  The provisions of Sections 3.13,  4.5, 6.1,
13.3,  13.5,  13.6 and 13.7 shall  survive any  termination  hereof  pursuant to
Section 12.1.

                                  ARTICLE XIII

                                  Miscellaneous

     13.1 Notices.  All notices and other  communications  hereunder shall be in
writing  and  shall be  deemed  given  upon  receipt  if  delivered  personally,
telecopied  (which  telecopy is  confirmed) or mailed by registered or certified
mail (return receipt requested) or the next day if by overnight delivery service
to the parties at the following  addresses (or at such other address for a party
as shall be specified by like notice):

                        if to Purchaser, to:

                           Magellan Health Services, Inc.
                           3414 Peachtree Road, N.E.
                           Suite 1400
                           Atlanta, Georgia  30319
                           Attention:  General Counsel
                           Telecopy:  404-814-5717

                        with a copy to:

                           Magellan Health Services, Inc.
                           3414 Peachtree Road, N.E.
                           Suite 1400
                           Atlanta, Georgia  30319
                           Attention:  Chief Financial Officer
                           Telecopy:  404-814-5793


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                        if to Seller, to:

                           Aetna Insurance Company of Connecticut
                           c/o Aetna U.S. Healthcare Inc.
                           151 Farmington Avenue
                           Hartford, Connecticut 06156
                           Attention: Chief Legal Officer
                           Telecopy: 860-273-8340

                        with a copy to:

                           Howard, Darby & Levin
                           1330 Avenue of the Americas
                           New York, New York 10019
                           Attention: John P. Gourary
                           Telecopy: 212-841-1010


     13.2  Amendments;  No Waivers.  (a) Any provision of this  Agreement may be
amended or waived if, and only if,  such  amendment  or waiver is in writing and
signed, in the case of an amendment,  by Purchaser and Seller, or in the case of
a waiver, by the party against whom the waiver is to be effective.

     (b) No failure or delay by either party in exercising  any right,  power or
privilege  hereunder  shall operate as a waiver  thereof nor shall any single or
partial  exercise  thereof preclude any other or further exercise thereof or the
exercise of any other right, power or privilege.  The rights and remedies herein
provided  shall be  cumulative  and not  exclusive  of any  rights  or  remedies
provided by law, except as otherwise provided in Section 11.3(b).

     13.3  Expenses.  All costs and expenses  incurred in  connection  with this
Agreement shall be paid by the party incurring such cost or expense.

     13.4  Successors and Assigns.  The  provisions of this  Agreement  shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors  and  permitted  assigns;  provided  that  neither  party may assign,
delegate  or  otherwise  transfer  any of its rights or  obligations  under this
Agreement  without  the prior  written  consent of the other party  hereto.  Any
purported assignment not permitted by this Section 13.4 shall be void.

     13.5 Governing Law. This  Agreement  shall be construed in accordance  with
and  governed  by the  law of the  State  of New  York,  without  regard  to any
applicable principles of conflicts of law.

     13.6 Submission to Jurisdiction.  Each of the parties hereto hereby submits
to the  exclusive  jurisdiction  of the  United  States  District  Court for the
Southern  District  of New York and of any New York State  court  sitting in New
York City for  purposes of all legal  proceedings  arising out of or relating to
this Agreement or the

                                       43





transactions contemplated hereby. Each of the parties hereto irrevocably waives,
to the  fullest  extent  permitted  by law,  any  objection  which it may now or
hereafter  have to the laying of the venue of any  proceeding  brought in such a
court and any claim  that any such  proceeding  brought in such a court has been
brought in an inconvenient forum.

     13.7 Waiver of Jury Trial.  Each of the parties  hereto hereby  irrevocably
waives any and all right to trial by jury in any legal proceeding arising out of
or relating to this Agreement or the transactions contemplated hereby.

     13.8 Specific Performance. The parties acknowledge that money damages alone
would not a sufficient  remedy for any breach of Section 6.1 of this  Agreement,
and  that the non-  breaching  party  shall be  entitled  to  equitable  relief,
including injunction and specific performance,  as a remedy for any such breach.
Such  remedies  shall be in addition to all other  legal or  equitable  remedies
available to such party.

     13.9  Counterparts;  Effectiveness.  This  Agreement  may be  signed in any
number of counterparts, each of which shall be an original, with the same effect
as if the  signatures  thereto  and hereto were upon the same  instrument.  This
Agreement  shall become  effective  when each party hereto shall have received a
counterpart hereof signed by the other party hereto.

     13.10 Entire  Agreement.  This Agreement  constitutes the entire  agreement
between the parties with respect to the subject matter hereof and supersedes all
prior  agreements,  understandings  and  negotiations,  both  written  and oral,
between the parties with  respect to the subject  matter of this  Agreement.  No
representation,  inducement, promise,  understanding,  condition or warranty not
set forth herein has been made or relied upon by either party hereto.

     13.11  Severability.  This  Agreement  shall be deemed  severable,  and the
invalidity or  unenforceability of any term or provision of this Agreement shall
not affect the validity or enforceability of this Agreement or of any other term
hereof, which shall remain in full force and effect.

     13.12  Captions;   Construction.  The  captions  herein  are  included  for
convenience  of  reference  only and shall be  ignored  in the  construction  or
interpretation hereof. The parties acknowledge that this Agreement was initially
prepared by Seller,  and that all parties have read and  negotiated the language
used  in this  Agreement.  The  parties  agree  that,  because  all the  parties
participated in negotiating and drafting this Agreement, no rule of construction
shall apply to this Agreement which construes  ambiguous language in favor of or
against any party by reason of that party's role in drafting this Agreement.

     13.13 Third Party  Beneficiaries.  None of the provisions of this Agreement
shall be for the benefit of, or enforceable  by, any employee or creditor of any
party hereto.

     13.14 No Set-off. The parties hereto expressly waive any rights to set-off
against any amount or payment due hereunder that any party may have under law or
equity.



                                       44





     In witness  whereof,  the parties  hereto here caused this  Agreement to be
duly  executed by their  respective  authorized  officers as of the day and year
first above written.

                           Magellan Health Services, Inc.



                           By  /s/ Mac Crawford
                              -------------------------------
                              Name:  Mac Crawford
                              Title:  Chairman, President and 
                                      Chief Executive Officer


                           Aetna Insurance Company of Connecticut



                           By  /s/ James H. Dickerson, Jr.
                              --------------------------------
                              Name:  James H. Dickerson, Jr.
                              Title:  Vice President


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