CARDINAL HEALTH INC
SC 13D, 1998-10-16
DRUGS, PROPRIETARIES & DRUGGISTS' SUNDRIES
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934

                             ALLEGIANCE CORPORATION
                  ---------------------------------------------
                                (Name of Issuer)

                     Common Stock, $1.00 par value per share
                  ---------------------------------------------
                         (Title of Class of Securities)

                                    017475104
                  ---------------------------------------------
                                 (CUSIP Number)

                                Robert D. Walter
                              Cardinal Health, Inc.
                               5555 Glendon Court
                               Dublin, Ohio 43016
                                 (614) 717-5000

                                 With a copy to:

                               David A. Katz, Esq.
                         Wachtell, Lipton, Rosen & Katz
                               51 West 52nd Street
                              New York, N.Y. 10019
                                 (212) 403-1000
                  ---------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 October 8, 1998
              -----------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  which is the subject of this  Schedule  13D,  and is
filing this Schedule because of Rule13d-1(b)(3) or (4), check the following box:
/ /



                               Page 1 of 11 Pages
<PAGE>

- -----------------                                     --------------------------
CUSIP No.
017475104                              13D               Page 2 of 11 Pages
- -----------------                                     --------------------------

- ------- ------------------------------------------------------------------------
  1     Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person
        Cardinal Health, Inc.
        31-0958666
- ------- ------------------------------------------------------------------------
        Check the Appropriate Box if a Member of a Group (See Instructions)    
  2                                                        (a)  /  /           
                                                           (b)  /  /
- ------- ------------------------------------------------------------------------
  3     SEC Use Only
- ------- ------------------------------------------------------------------------
  4     Sources of Funds (See Instructions)
        WC
- ------- ------------------------------------------------------------------------
        Check Box if Disclosure of Legal Proceedings is Required Pursuant
  5     to Item 2(d) or 2(e)                                    /  /
- ------- ------------------------------------------------------------------------
  6     Citizenship or Place of Organization
        Ohio
- ------- ------------------------------------------------------------------------
                 7     Sole Voting Power
  Number of            0
               ------- ---------------------------------------------------------
   Shares        8     Shared Voting Power
Beneficially           0
               ------- ---------------------------------------------------------
  Owned By       9     Sole Dispositive Power
    Each               0
               ------- ---------------------------------------------------------
  Reporting      10    Shared Dispositive Power
 Person With           0
- -------------- ------- ---------------------------------------------------------
     11        Aggregate Amount Beneficially Owned by Each Reporting Person
               22,284,538 of Common Stock
- -------------- -----------------------------------------------------------------
               Check Box if the Aggregate Amount in Row (11) Excludes Certain 
     12        Shares (See Instructions)                        /  /
- -------------- -----------------------------------------------------------------
     13        Percent of Class Represented by Amount in Row (11)

               16.6%.  Based upon 111,982,604 shares of Common Stock outstanding
               as of September 30, 1998, as  represented  by Issuer,  calculated
               pursuant to Rule 13d-3(d)(1) and assuming, solely for purposes of
               such  calculation,  that the option to  purchase  such shares has
               been exercised.

- -------------- -----------------------------------------------------------------
     14        Type of Reporting Person (See Instructions)
               HC, CO
- -------------- -----------------------------------------------------------------

<PAGE>

ITEM 1. SECURITY AND ISSUER.

                  This Schedule 13D relates to the common stock, par value $1.00
per share ("Allegiance  Common Stock"),  of Allegiance  Corporation,  a Delaware
corporation  ("Allegiance").  The principal  executive offices of Allegiance are
located at 1430 Waukegan Road, McGaw Park, Illinois 60085.

ITEM 2. IDENTITY AND BACKGROUND.

                  This Schedule 13D is filed by Cardinal  Health,  Inc., an Ohio
corporation  ("Cardinal").  Cardinal is a national health care service provider,
providing  an array of  value-added  pharmaceutical  distribution  services to a
broad  base  of  customers   nationwide.   Through  a  number  of  wholly  owned
subsidiaries,   Cardinal  also  provides  a  variety  of  pharmaceutical-related
products and services.  Cardinal's  principal  executive  offices are located at
5555 Glendon Court, Dublin, Ohio 43016.

                  Each  executive  officer  and each  director  of Cardinal is a
citizen of the United States.  The name,  business address and present principal
occupation of each  executive  officer and director of Cardinal are set forth in
Annex I to this Schedule 13D, which is incorporated herein by this reference.

                  During  the  last  five  years,  to  the  best  of  Cardinal's
knowledge,  neither Cardinal nor any of its executive  officers or directors has
been convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors)  or has  been a  party  to a civil  proceeding  of a  judicial  or
administrative  body of competent  jurisdiction as a result of which Cardinal or
such  person was or is subject to a judgment,  decree or final  order  enjoining
future violations of, or prohibiting or mandating activities subject to, federal
or state  securities  laws, or finding any violation  with respect to such laws,
and which judgment, decree or final order was not subsequently vacated.

ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

                  As  more  fully  set  forth   below  in  Item  4  "Purpose  of
Transaction,"  pursuant to an Agreement and Plan of Merger,  dated as of October
8, 1998 (the "Merger Agreement"),  by and among Cardinal,  Boxes Merger Corp., a
Delaware corporation and a wholly-owned subsidiary of Cardinal ("Merger Corp."),
and  Allegiance,  subject to the terms and  conditions of the Merger  Agreement,
Merger Corp.  will merge (the "Merger") with and into Allegiance with Allegiance
as the surviving  corporation  (the  "Surviving  Corporation").  Allegiance will
become a  wholly-owned  subsidiary  of  Cardinal,  and each share of  Allegiance
Common Stock shall be converted  into and represent a number of Cardinal  common
shares,  without  par value  ("Cardinal  Common  Shares")  equal to 0.4150  (the
"Exchange  Ratio").  Upon the  completion  of  Cardinal's  previously  announced
3-for-2  stock split (the  record  date for which was  October 9, 1998,  and the
payment date for which is October 30, 1998), the Exchange Ratio will be adjusted
so that each  share of  Allegiance  Common  Stock  shall be  converted  into and
represent a number of Cardinal Common Shares equal to 0.6225 (the Exchange Ratio
may also be adjusted to take into account future  changes in the  capitalization
of the Cardinal Common Shares, as specified in the Merger Agreement).  A copy of
the  Merger  Agreement  is  filed as  Exhibit  2.1 to this  Schedule  13D and is
incorporated herein by this reference.  The foregoing  description of the Merger
Agreement is qualified in its entirety by reference to such exhibit. See Item 4.

                  In  connection  with  the  Merger   Agreement,   Cardinal  and
Allegiance  have entered into a Stock Option  Agreement,  dated as of October 8,
1998 (the "Stock Option Agreement"), 

                                  Page 3 of 11
<PAGE>

pursuant to which Allegiance has granted to Cardinal an option (the "Option") to
purchase  from  Allegiance,  under  certain  circumstances,   up  to  22,284,538
authorized and unissued  shares of Allegiance  Common Stock.  The exercise price
per share  under the Option is the lower of (a)  $38.46,  and (b) the product of
the  Exchange  Ratio  times the  average  of the  closing  prices  (or,  if such
securities  should  not trade on a given  day,  the  average  of the bid and ask
prices  therefor on such day) of the Cardinal  Common  Shares as reported on the
NYSE  Composite  Tape during the five  consecutive  trading  days ending on (and
including) the trading day immediately  prior to the day the option is exercised
(such  average  being the  "Cardinal  Closing  Price").  In the  event  that any
additional  shares of  Allegiance  Common Stock are issued after the date of the
Stock Option Agreement (other than under certain  circumstances set forth in the
Stock Option  Agreement),  the number of shares of Allegiance  Common Stock that
may be purchased under the Option will be adjusted so that, after such issuance,
it equals at least 19.9% of the number of shares of Allegiance Common Stock then
issued and  outstanding  (without  considering  any shares  subject to or issued
pursuant to the Option).

                  As of the date  hereof,  the  Option is not  exercisable.  The
shares  of   Allegiance   Common  Stock   subject  to  the  Option  would  equal
approximately  19.9% of the  outstanding  Allegiance  Common Stock before giving
effect to the exercise of the Option and approximately  16.6% of the outstanding
Allegiance Common Stock after giving effect to the exercise of the Option. Under
certain circumstances,  Cardinal may require Allegiance to, or Allegiance may be
permitted to, repurchase for cash the Option and any shares of Allegiance Common
Stock acquired pursuant to the exercise of the Option.

                  The  exercise  of the  Option  for the full  number  of shares
currently  covered  thereby would require  aggregate  funds of  $857,063,331.50,
based on an exercise  price of $38.46 per share.  Since the  exercise  price per
share of the  Option  is equal to the  lower of $38.46  and the  product  of the
Exchange Ratio and the Cardinal  Closing Price,  the aggregate funds required to
exercise the Option in full may be lower (but not higher)  than  $857,063,331.50
depending on the Cardinal  Closing  Price.  It is anticipated  that,  should the
Option become  exercisable and should Cardinal determine to exercise the Option,
Cardinal would obtain the funds for the purchase from working  capital and/or by
borrowing from parties whose identity is not yet known.

                  A copy of the Stock  Option  Agreement is filed as Exhibit 2.2
to this Schedule 13D and is incorporated herein by this reference. The foregoing
description  of the Stock  Option  Agreement  is  qualified  in its  entirety by
reference to such exhibit.

ITEM 4. PURPOSE OF TRANSACTION.

                  In   connection   with  the  execution  of  the  Stock  Option
Agreement,  Cardinal,  Merger  Corp.  and  Allegiance  entered  into the  Merger
Agreement,  pursuant to which,  among other matters and subject to the terms and
conditions set forth therein,  Merger Corp. will merge with and into Allegiance,
with  Allegiance as the Surviving  Corporation  of the Merger and a wholly-owned
subsidiary  of Cardinal.  The Option was granted by Allegiance as a condition of
and  in  consideration   for  Cardinal   entering  into  the  Merger  Agreement.
Consummation of the Merger is subject to certain  conditions,  including,  among
others, (i) the approval of the Merger Agreement by the holders of a majority of
the  outstanding  shares of  Allegiance  Common Stock in the manner  required by
applicable  law;  (ii)  the  approval  by the  holders  of the  majority  of the
outstanding Cardinal Common Shares of the issuance of the Cardinal Common Shares
issuable in the Merger and the transactions contemplated by the Merger Agreement
in the manner  required by applicable  law and the  applicable  rules of the New
York Stock  Exchange (the "NYSE");  (iii) the  expiration or  termination of all
waiting  periods  applicable  to  the  consummation  of  the  Merger  under  the
Hart-Scott-Rodino  Antitrust  Improvements  Act of  1976,

                                  Page 4 of 11
<PAGE>

as  amended,   and  the  obtaining  of  any  other   approvals  of  governmental
authorities;  (iv) the  absence of any  applicable  law,  regulation,  judgment,
injunction  order or decree  prohibiting  or enjoining the  consummation  of the
Merger or the transactions  contemplated by the Merger Agreement or limiting the
ownership  or  operation  by  Cardinal,  Allegiance  or any of their  respective
subsidiaries  of any material  portion of their  businesses  or assets;  (v) the
absence of any pending action instituted by a governmental authority challenging
or seeking to restrain or prohibit the  consummation of the Merger or any of the
other  transactions  contemplated  by the Merger  Agreement;  (vi) the effective
registration  of the Cardinal  Common Shares to be issued in connection with the
Merger  under the  Securities  Act of 1933,  as  amended  (and no stop  order or
similar  registration  order  suspending the  effectiveness  of the registration
statement  shall be in  effect  and no  proceedings  for such  purpose  shall be
pending  or  threatened);  (vii) the  approval  for  listing  by the NYSE of the
Cardinal  Common Shares to be issued in connection  with the Merger,  subject to
official  notice of  issuance;  (viii)  receipt by Cardinal  of an  accountant's
letter  confirming  that the  Merger  will  qualify  as a pooling  of  interests
transaction for financial reporting  purposes;  (ix) receipt by Allegiance of an
opinion of counsel  that,  among  other  things,  the Merger will  constitute  a
reorganization  under  Section  368(a) of the Internal  Revenue Code of 1986, as
amended;  (x) Cardinal's being satisfied,  in its sole discretion,  that certain
limitations  contained  in an  Allegiance  contract  referenced  in  the  Merger
Agreement (the "Subject Contract") shall not apply to the business or operations
of Cardinal, Cardinal's subsidiaries or the Surviving Corporation from and after
the time the Merger is consummated;  (xi) there shall have been no breach of the
Stock Option Agreement; and (xii) satisfaction of certain other conditions.

                  The  Subject  Contract  referenced  in  clause  (x) above is a
contract  between  Allegiance  and a third  party  that was  entered  into  when
Allegiance terminated the relationship with the third party and discontinued the
line of business it was in with the third party. The Subject Contract limits the
ability  of  Allegiance  and  certain   related  parties  to  compete  in  these
discontinued  businesses,  but only through a defined period ending on April 21,
1999  when the  contract  restriction  expires  in  accordance  with its  terms.
Allegiance is currently in compliance with the Subject  Contract.  The condition
to closing set forth in clause (x) above leaves it to Cardinal to determine,  in
its sole  discretion,  whether  certain  limitations  set  forth in the  Subject
Contract   apply  to  the  business  or  operations   of  Cardinal,   Cardinal's
subsidiaries or the Surviving  Corporation  from and after the effective time of
the Merger (the "Effective  Time"), and the condition may be satisfied or waived
by Cardinal at any time.

                  Pursuant to the Merger  Agreement,  upon  consummation  of the
Merger,  (a) the officers of  Allegiance  will be the officers of the  Surviving
Corporation,  (b) the  directors  of Merger Corp.  will be the  directors of the
Surviving  Corporation,  (c)  each  share of  Allegiance  Common  Stock  will be
converted  into Cardinal  Common Shares in accordance  with the Exchange  Ratio,
with cash paid in lieu of receipt of fractional  Cardinal Common Shares, and (d)
at the Effective Time of the Merger, the Certificate of Incorporation and Bylaws
of  Allegiance,  as the Surviving  Corporation,  will be amended to be identical
(save  for  the  name  of  the  corporation)  to  those  of  Merger  Corp.  Upon
consummation  of the Merger,  the Allegiance  Common Stock will be delisted from
the NYSE. In connection with the execution of the Merger  Agreement,  Allegiance
amended its Rights Agreement, dated as of September 30, 1996, between Allegiance
and First  Chicago Trust  Company of New York,  to make it  inapplicable  to the
Merger,  the Stock Option  Agreement  or the  transactions  contemplated  by the
Merger Agreement or the Stock Option Agreement.

                  The  Merger  Agreement  further  provides  that  the  Board of
Directors of Cardinal will take all action necessary  immediately  following the
Effective Time to elect Mr. Lester B. Knight,  the Chairman and Chief  Executive
Officer of Allegiance,  and two other individuals who were independent directors
of  Allegiance  at the date of the  Merger  Agreement  (such  individuals  to be
selected by the chairman of Cardinal  from among three  proposed by the Board of
Directors of Allegiance) as directors of Cardinal.

                                  Page 5 of 11
<PAGE>

                  The  Merger   Agreement  may  be   terminated   under  certain
circumstances described in Article VII of the Merger Agreement, including if the
Merger is not completed  prior to May 15, 1999 (provided that the party desiring
to terminate the Merger Agreement is not at fault for the Merger failing to have
occurred on or before such date).

                  A copy of the Merger Agreement is filed as Exhibit 2.1 to this
Schedule  13D and is  incorporated  herein  by  this  reference.  The  foregoing
description of the Merger Agreement is qualified in its entirety by reference to
such exhibit.

                  Except as set forth herein, Cardinal does not have any current
plans or proposals that relate to or would result in (i) the  acquisition by any
person of additional  shares of Allegiance  Common Stock or the  disposition  of
shares of Allegiance Common Stock; (ii) an extraordinary  corporate transaction,
such as a merger, reorganization or liquidation,  involving Allegiance or any of
its  subsidiaries;  (iii) a sale or transfer of any material amount of assets of
Allegiance or any of its  subsidiaries;  (iv) any change in the present board of
directors  or  management  of  Allegiance,  including  any plans or proposals to
change the number or term of  directors  or to fill any  vacancies on the board;
(v) any  material  change in the present  capitalization  or dividend  policy of
Allegiance; (vi) any other material change in Allegiance's business or corporate
structure;  (vii) any change in  Allegiance's  Certificate of  Incorporation  or
Bylaws, or instruments  corresponding  thereto, or other actions that may impede
the  acquisition of control of Allegiance by any person;  (viii) causing a class
of securities of Allegiance to be delisted from a national  securities  exchange
or to cease to be authorized to be quoted in an inter-dealer quotation system of
a registered national securities association;  (ix) a class of equity securities
of Allegiance  becoming  eligible for  termination of  registration  pursuant to
Section 12(g)(4) of the Securities  Exchange Act of 1934, as amended; or (x) any
action similar to any of those enumerated above.

ITEM 5. INTEREST IN SECURITIES OF ISSUER.

                  Although  the Option does not allow  Cardinal to purchase  any
shares  of  Allegiance  Common  Stock  pursuant  thereto  unless  and  until the
conditions to exercise the Option specified in the Stock Option Agreement occur,
assuming  for purposes of this Item 5 that such  conditions  are  satisfied  and
Cardinal is entitled to purchase  shares of Allegiance  Common Stock pursuant to
the Option,  Cardinal would currently be entitled to purchase  22,284,538 shares
of Allegiance Common Stock, or approximately 19.9% of the currently  outstanding
Allegiance  Common Stock before  giving effect to the exercise of the Option and
16.6% of the currently  outstanding  Allegiance Common Stock after giving effect
to the  exercise of the Option  (based  upon  111,982,604  shares of  Allegiance
Common Stock  outstanding as of September 30, 1998, as represented by Allegiance
in the Merger Agreement).

                  Cardinal  does not have the  right to  acquire  any  shares of
Allegiance  Common Stock under the Option unless certain events specified in the
Stock Option Agreement occur. Accordingly, Cardinal does not have sole or shared
voting or  dispositive  power with  respect to any shares of  Allegiance  Common
Stock purchasable under the Option, and Cardinal disclaims  beneficial ownership
of  Allegiance  Common  Stock  subject to the Option  until such  events  occur.
Assuming  for  purposes of this Item 5 that events  occurred  that would  enable
Cardinal to exercise  the Option and  Cardinal  exercised  the Option,  Cardinal
would have sole  voting  power and sole  dispositive  power with  respect to the
shares of Allegiance Common Stock acquired pursuant to the Option.

                                  Page 6 of 11
<PAGE>

                  A copy of the Stock  Option  Agreement is filed as Exhibit 2.2
to this Schedule 13D and is incorporated herein by this reference. The foregoing
description  of the Stock  Option  Agreement  is  qualified  in its  entirety by
reference to such exhibit.

                  As of the date hereof,  Mr.  Robert J.  Zollars,  an executive
officer of Cardinal, beneficially owns 34,456 shares of Allegiance Common Stock,
which shares represent less than 0.1% of the outstanding Allegiance Common Stock
(based upon  111,982,604  shares of Allegiance  Common Stock  outstanding  as of
September 30, 1998, as represented by Allegiance in the Merger  Agreement).  Mr.
Zollars  has the sole power to vote and  dispose of such  shares.  Except as set
forth in this paragraph with respect to Mr.  Zollars,  to the best of Cardinal's
knowledge,  as of the date hereof,  no executive officer or director of Cardinal
beneficially  owns any shares of Allegiance  Common  Stock,  nor (except for the
issuance of the Option) have any  transactions  in Allegiance  Common Stock been
effected  during the past sixty days by Cardinal  or, to the best  knowledge  of
Cardinal,  by any  executive  officer or director of Cardinal.  In addition,  no
other  person is known by  Cardinal to have the right to receive or the power to
direct the receipt of  dividends  from,  or the  proceeds  from the sale of, the
securities covered by this Schedule 13D.

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT 
        TO SECURITIES OF THE ISSUER.

                  Mr. Knight and Mr.  Joseph F. Damico,  the President and Chief
Operating  Officer of  Allegiance,  have each entered into an agreement  (each a
"Voting/Support  Agreement")  with  Cardinal  pursuant  to  which,  among  other
matters,  each of them has agreed  (i) to vote all of the  shares of  Allegiance
Common  Stock  beneficially  owned by him or over which he has  voting  power or
control to approve  the  Merger and the Merger  Agreement,  and (ii) not to vote
such shares in favor of any other  recapitalization,  merger,  consolidation  or
other  business  combination  involving  Allegiance  or any  acquisition  of any
capital stock from  Allegiance  (other than upon exercise of stock options which
are outstanding as of the date of the agreement) or 30% or more of the assets of
Allegiance and its subsidiaries,  taken as a whole, in a single transaction or a
series of related transactions, or any acquisition by Allegiance of any material
assets  or  capital  stock  of  any  other  person,  or any  combination  of the
foregoing. Mr. Knight is estimated to have voting power over approximately 1.5%,
and Mr. Damico is estimated to have voting power over approximately 1.0%, of the
outstanding  shares of Allegiance Common Stock, based upon 111,982,604 shares of
Allegiance  Common Stock outstanding as of September 30, 1998, as represented by
Allegiance in the Merger Agreement.

                   Copies of the Support/Voting  Agreements,  each dated October
8, 1998,  executed  by Messrs.  Knight and  Damico,  respectively,  are filed as
Exhibits 3.1 and 3.2,  respectively,  to this Schedule 13D and are  incorporated
herein  by this  reference.  The  foregoing  description  of the  Support/Voting
Agreements is qualified in its entirety by reference to such exhibits. A copy of
the  Merger  Agreement  is  filed as  Exhibit  2.1 to this  Schedule  13D and is
incorporated  herein by this  reference.  See Item 4. A copy of the Stock Option
Agreement  is filed as  Exhibit  2.2 to this  Schedule  13D and is  incorporated
herein by this reference. See Items 3 and 5.

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.

The following exhibits are filed as part of this Schedule 13D:

Exhibit 2.1   --   Agreement and Plan of Merger, dated as of October 8, 1998, by
                   and among Cardinal Health, Inc., Boxes Merger Corp. and
                   Allegiance Corporation.

                                  Page 7 of 11
<PAGE>

Exhibit 2.2   --   Stock Option Agreement, dated as of October 8, 1998, by and 
                   between Cardinal Health, Inc. and Allegiance Corporation.

Exhibit 3.1   --   Voting/Support Agreement, dated as of October 8, 1998, by and
                   between Cardinal Health, Inc. and Lester B. Knight

Exhibit 3.2   --   Voting/Support Agreement, dated as of October 8, 1998, by and
                   between Cardinal Health, Inc. and Joseph F. Damico











                                  Page 8 of 11
<PAGE>
                                     ANNEX I

            DIRECTORS AND EXECUTIVE OFFICERS OF CARDINAL HEALTH, INC.

                  Set forth below are the name and present principal  occupation
of each director and executive  officer of Cardinal  Health,  Inc. as of October
16, 1998.  The business  address of each such director and executive  officer is
c/o Cardinal Health, Inc., 5555 Glendon Court, Dublin, Ohio 43016.

DIRECTOR                                         PRINCIPAL OCCUPATION
- --------                                         --------------------

Aleksander Erdeljan             Former Chairman, R.P. Scherer Corporation,  a 
                                subsidiary  of  Cardinal  Health,  Inc.  and a
                                developer  and  manufacturer  of drug delivery
                                systems.


John F. Finn                    Chairman and Chief Executive Officer of Gardner,
                                Inc., an outdoor power equipment distributor.


Robert L. Gerbig                Chairman and Chief Executive Officer of  Gerbig,
                                Snell/Weisheimer  &  Associates,  Inc.,  an
                                advertising agency.

John F. Havens                  Retired Chairman and  Director  Emeritus of Banc
                                One Corporation, a bank holding company.

Regina E. Herzlinger            Professor,  Harvard  University  Graduate School
                                of Business Administration.


John C. Kane                    President  and  Chief  Operating   Officer  of  
                                Cardinal Health, Inc.

J. Michael Losh                 Executive  Vice  President  and  Chief Financial
                                Officer  of  General   Motors   Corporation,   a
                                manufacturer of automobiles.

George R. Manser                Chairman  of Uniglobe  Travel (Capital  Cities) 
                                Inc.  and  Director  of  Corporate   Finance  of
                                Uniglobe  Travel  (U.S.A.) LLC,  travel planning
                                services companies.

John B.  McCoy                  Chairman and Chief Executive Officer of Banc One
                                Corporation, a bank holding company.

                                  Page 9 of 11
<PAGE>

Jerry E. Robertson              Retired  Executive  Vice  President of the  Life
                                Sciences   Sector  and  Corporate   Services  of
                                Minnesota  Mining  &  Manufacturing  Company,  a
                                manufacturer of industrial,  commercial,  health
                                care and consumer products.

L. Jack Van Fossen              Retired  President  and Chief  Executive Officer
                                of Red Roof Inns, Inc., a lodging company.

Robert D. Walter                Chairman  and  Chief   Executive   Officer  of  
                                Cardinal Health, Inc.

Melburn G. Whitmire             Vice Chairman of Cardinal Health, Inc.

EXECUTIVE OFFICERS (OTHER THAN EXECUTIVE                    PRINCIPAL OCCUPATION
OFFICERS WHO ARE ALSO DIRECTORS):                           --------------------
- ---------------------------------

David A. Abrahamson             Executive Vice President; President - Medicine 
                                Shoppe.

George H. Bennett, Jr.          Executive Vice President, General Counsel and 
                                Secretary.

George L. Fotiades              Executive Vice President; Group President - R.P.
                                Scherer Corporation.

James F. Millar                 Executive  Vice  President;  Group  President - 
                                Cardinal Distribution.

Richard J. Miller               Vice  President,  Controller  and  Principal  
                                Accounting   Officer;   Acting  Chief  Financial
                                Officer.

Carl A. Spalding                Executive Vice  President;  Group President - 
                                Healthcare Product Services.

Robert J. Zollars               Executive  Vice  President;  Group  President - 
                                Pharmacy Automation & Management.









                                 Page 10 of 11
<PAGE>


                                   SIGNATURE


                  After  reasonable  inquiry and to the best of my knowledge and
belief,  the  undersigned  certifies  that  the  information  set  forth in this
Statement is true, complete and correct.


Dated:  October 16, 1998



                                      CARDINAL HEALTH, INC.


                                      By:   /s/ George H. Bennett, Jr.
                                         ---------------------------------------
                                            George H. Bennett, Jr.
                                            Executive Vice President, General 
                                            Counsel and Secretary











                                 Page 11 of 11

                                                                    EXHIBIT 2.1






                          AGREEMENT AND PLAN OF MERGER

                                      AMONG

                              CARDINAL HEALTH, INC.
                                  ("Cardinal"),

                               BOXES MERGER CORP.
                  a wholly owned direct subsidiary of Cardinal
                                  ("Subcorp"),



                                       and



                             ALLEGIANCE CORPORATION
                                 ("Allegiance")







                                 October 8, 1998



<PAGE>


                                TABLE OF CONTENTS


                                                                            Page

PRELIMINARY STATEMENTS.........................................................1
AGREEMENT             .........................................................1
ARTICLE I.           THE MERGER................................................2
          1.1     The Merger...................................................2
          1.2     Effective Time...............................................2
          1.3     Effects of the Merger........................................2
          1.4     Certificate of Incorporation and Bylaws......................2
          1.5     Directors and Officers of the Surviving Corporation..........2
          1.6     Additional Actions...........................................3
ARTICLE II.          CONVERSION OF SECURITIES .................................3
          2.1     Conversion of Capital Stock..................................3
          2.2     Exchange Ratio; Fractional Shares; Adjustments...............3
          2.3     Exchange of Certificates.....................................4
                  (a)Exchange Agent............................................4
                  (b)Exchange Procedures.......................................4
                  (c)Distributions with Respect to Unexchanged Shares..........5
                  (d)No Further Ownership Rights in Allegiance Common Stock....6
                  (e)Termination of Exchange Fund..............................6
                  (f)No Liability..............................................6
                  (g)Investment of Exchange Fund...............................7
                  (h)Withholding Rights........................................7
          2.4     Treatment of Stock Options and Employee Stock Purchase Plan..7
ARTICLE III.         REPRESENTATIONS AND WARRANTIES OF CARDINAL AND
                     SUBCORP ..................................................8
          3.1     Organization and Standing....................................8
          3.2     Corporate Power and Authority................................9
          3.3     Capitalization of Cardinal and Subcorp.......................9
          3.4     Conflicts; Consents and Approval............................10
          3.5     Brokerage and Finder's Fees.................................11
          3.6     Accounting Matters; Reorganization..........................11
          3.7     Cardinal SEC Documents......................................11
          3.8     Registration Statement; Joint Proxy Statement...............11
          3.9     Compliance with Law.........................................12
          3.10    Litigation..................................................12
          3.11    Board Recommendation; Required Vote.........................13
          3.12    No Material Adverse Change..................................13
          3.13    Undisclosed Liabilities.....................................13
ARTICLE IV.          REPRESENTATIONS AND WARRANTIES OF ALLEGIANCE ............13
          4.1     Organization and Standing...................................13
          4.2     Subsidiaries................................................14


<PAGE>

          4.3     Corporate Power and Authority...............................14
          4.4     Capitalization of Allegiance................................15
          4.5     Conflicts; Consents and Approvals...........................15
          4.6     No Material Adverse Change..................................16
          4.7     Allegiance SEC Documents....................................16
          4.8     Taxes.......................................................17
          4.9     Compliance with Law.........................................18
          4.10    Intellectual Property.......................................19
          4.11    Registration Statement; Joint Proxy Statement...............20
          4.12    Litigation; Products Liability..............................20
          4.13    Brokerage and Finder's Fees.................................20
          4.14    Accounting Matters; Reorganization..........................20
          4.15    Employee Benefit Plans......................................21
          4.16    Contracts...................................................23
          4.17    Labor Matters...............................................24
          4.18    Undisclosed Liabilities.....................................24
          4.19    Permits; Compliance.........................................24
          4.20    Environmental Matters.......................................25
          4.21    Opinion of Financial Advisor................................26
          4.22    Board Recommendation; Required Vote.........................26
          4.23    Section 203 of DGCL; Rights Agreement.......................26
          4.24    Employee Agreements.........................................27
ARTICLE V.           COVENANTS OF THE PARTIES ................................27
          5.1     Mutual Covenants............................................27
                  (a)HSR Act Filings; Reasonable Best Efforts; Notification...27
                  (b)Pooling-of-Interests.....................................29
                  (c)Tax-Free Treatment.......................................30
                  (d)Public Announcements.....................................30
          5.2     Covenants of Cardinal.......................................30
                  (a)Cardinal Shareholders Meeting............................30
                  (b)Preparation of Registration Statement....................30
                  (c)Conduct of Cardinal's Operations.........................31
                  (d)Indemnification; Directors' and Officers' Insurance......32
                  (e)Merger Sub...............................................32
                  (f)NYSE Listing.............................................32
                  (g)Access...................................................32
                  (h)Board of Directors of Cardinal...........................32
                  (i)Employees and Employee Benefits..........................33
                  (j)Restrictions on Termination of Employees Benefits........34
                  (k)SIP......................................................34
          5.3     Covenants of Allegiance.....................................34
                  (a)Allegiance Stockholders Meeting..........................34
                  (b)Information for the Registration Statement and Preparation 
                     of Joint Proxy Statement.................................34
                  (c)Conduct of Allegiance's Operations.......................35


                                      -ii-
<PAGE>

                  (d)No Solicitation..........................................37
                  (e)Termination Right........................................39
                  (f)Affiliates of Allegiance.................................40
                  (g)Access...................................................40
                  (h)Subsequent Financial Statements..........................40
ARTICLE VI.          CONDITIONS ..............................................40
          6.1     Conditions to the Obligations of Each Party.................40
          6.2     Conditions to Obligations of Allegiance.....................41
          6.3     Conditions to Obligations of Cardinal and Subcorp...........42
ARTICLE VII.         TERMINATION AND AMENDMENT ...............................43
          7.1     Termination.................................................43
          7.2     Effect of Termination.......................................44
          7.3     Amendment...................................................45
          7.4     Extension; Waiver...........................................45
ARTICLE VIII.        MISCELLANEOUS ...........................................46
          8.1     Survival of Representations and Warranties..................46
          8.2     Notices.....................................................46
          8.3     Interpretation..............................................47
          8.4     Counterparts................................................48
          8.5     Entire Agreement............................................48
          8.6     Third-Party Beneficiaries...................................48
          8.7     Governing Law...............................................48
          8.8     Consent to Jurisdiction; Venue..............................48
          8.9     Specific Performance........................................48
          8.10    Assignment..................................................49
          8.11    Expenses....................................................49



                                     -iii-
<PAGE>


                          AGREEMENT AND PLAN OF MERGER

          This Agreement and Plan of Merger (this "Agreement") is made and
entered into as of the 8th day of October, 1998, by and among Cardinal Health,
Inc., an Ohio corporation ("Cardinal"), Boxes Merger Corp., a Delaware
corporation and a wholly owned subsidiary of Cardinal ("Subcorp"), and
Allegiance Corporation, a Delaware corporation ("Allegiance").


                             PRELIMINARY STATEMENTS

          A. Cardinal desires to combine its businesses with the businesses
operated by Allegiance through the merger of Subcorp with and into Allegiance,
with Allegiance as the surviving corporation (the "Merger"), pursuant to which
each share of Allegiance Common Stock (as defined in Section 4.4(a)) outstanding
at the Effective Time (as defined in Section 1.2) will be converted into the
right to receive Cardinal Common Shares (as defined in Section 3.3(a)) as more
fully provided herein.

          B. The Board of Directors of Allegiance has determined that the Merger
is consistent with and in furtherance of the long-term business strategy of
Allegiance and Allegiance desires to combine its businesses with the businesses
operated by Cardinal and for the holders of shares of Allegiance Common Stock
("Allegiance Stockholders") to have a continuing equity interest in the combined
Cardinal/Allegiance businesses through the ownership of Cardinal Common Shares.

          C. The parties intend that the Merger constitute a tax-free
"reorganization" within the meaning of Section 368(a)(1)(A) of the Internal
Revenue Code of 1986, as amended (the "Code"), by reason of Section 368(a)(2)(E)
of the Code.

          D. The parties intend that the Merger be accounted for as a
pooling-of-interests for financial reporting purposes.

          E. The respective Boards of Directors of Cardinal, Subcorp and
Allegiance have determined the Merger in the manner contemplated herein to be
desirable and in the best interests of their respective shareholders and, by
resolutions duly adopted, have approved and adopted this Agreement.


                                    AGREEMENT

          Now, therefore, in consideration of these premises and the mutual and
dependent promises hereinafter set forth, the parties hereto agree as follows:



<PAGE>

                                   ARTICLE I.

                                   THE MERGER

          1.1 The Merger. Upon the terms and subject to the conditions hereof,
and in accordance with the provisions of the Delaware General Corporation Law
(the "DGCL"), Subcorp shall be merged with and into Allegiance at the Effective
Time. As a result of the Merger, the separate corporate existence of Subcorp
shall cease and Allegiance shall continue its existence under the laws of the
State of Delaware. Allegiance, in its capacity as the corporation surviving the
Merger, is hereinafter sometimes referred to as the "Surviving Corporation."

          1.2 Effective Time. As promptly as possible on the Closing Date (as
defined below), the parties shall cause the Merger to be consummated by filing
with the Secretary of State of the State of Delaware (the "Delaware Secretary of
State") a certificate of merger (the "Certificate of Merger") in such form as is
required by and executed in accordance with Section 251 of the DGCL. The Merger
shall become effective (the "Effective Time") when the Certificate of Merger has
been filed with the Delaware Secretary of State or at such later time as shall
be agreed upon by Cardinal and Allegiance and specified in the Certificate of
Merger. Prior to the filing referred to in this Section 1.2, a closing (the
"Closing") shall be held at the offices of Cardinal, 5555 Glendon Court, Dublin,
Ohio 43016, or such other place as the parties may agree as soon as practicable
(but in any event within ten business days) following the date upon which all
conditions set forth in Article VI have been satisfied or waived, or at such
other date as Cardinal and Allegiance may agree; provided, that the conditions
set forth in Article VI have been satisfied or waived at or prior to such date.
The date on which the Closing takes place is referred to herein as the "Closing
Date." For all tax purposes, the Closing shall be effective at the end of the
day on the Closing Date.

          1.3 Effects of the Merger. From and after the Effective Time, the
Merger shall have the effects set forth in Section 259 of the DGCL.

          1.4 Certificate of Incorporation and Bylaws. The Certificate of Merger
shall provide that at the Effective Time (i) the Certificate of Incorporation of
the Surviving Corporation as in effect immediately prior to the Effective Time
shall be amended as of the Effective Time so as to contain the provisions, and
only the provisions, contained immediately prior thereto in the Certificate of
Incorporation of Subcorp, except for Article I thereof, which shall continue to
read "The name of the corporation is 'ALLEGIANCE CORPORATION'", and (ii) the
Bylaws of Subcorp in effect immediately prior to the Effective Time shall be the
Bylaws of the Surviving Corporation; in each case, until amended in accordance
with the DGCL.

          1.5 Directors and Officers of the Surviving Corporation. From and
after the Effective Time, the officers of Allegiance shall be the officers of
the Surviving Corporation and the directors of Subcorp shall be the directors of
the Surviving Corporation, in each case, until their respective successors are
duly elected and qualified. On or prior to the Closing Date, Allegiance shall
deliver to Cardinal evidence satisfactory to Cardinal of the resignations of the
directors of Allegiance, such resignations to be effective as of the Effective
Time.


                                      -2-
<PAGE>

          1.6 Additional Actions. If, at any time after the Effective Time, the
Surviving Corporation shall consider or be advised that any further deeds,
assignments or assurances in law or any other acts are necessary or desirable to
(a) vest, perfect or confirm, of record or otherwise, in the Surviving
Corporation its right, title or interest in, to or under any of the rights,
properties or assets of Allegiance, or (b) otherwise carry out the provisions of
this Agreement, Allegiance and its officers and directors shall be deemed to
have granted to the Surviving Corporation an irrevocable power of attorney to
execute and deliver all such deeds, assignments or assurances in law and to take
all acts necessary, proper or desirable to vest, perfect or confirm title to and
possession of such rights, properties or assets in the Surviving Corporation and
otherwise to carry out the provisions of this Agreement, and the officers and
directors of the Surviving Corporation are authorized in the name of Allegiance
or otherwise to take any and all such action.


                                   ARTICLE II.

                            CONVERSION OF SECURITIES

          2.1 Conversion of Capital Stock. At the Effective Time, by virtue of
the Merger and without any action on the part of Cardinal, Subcorp or Allegiance
or their respective shareholders:

          (a) Each share of common stock, $0.01 par value, of Subcorp ("Subcorp
     Common Stock") issued and outstanding immediately prior to the Effective
     Time shall be converted into one share of common stock, $0.01 par value, of
     the Surviving Corporation. Such newly issued shares shall thereafter
     constitute all of the issued and outstanding capital stock of the Surviving
     Corporation.

          (b) Subject to the other provisions of this Article II, each share of
     Allegiance Common Stock issued and outstanding immediately prior to the
     Effective Time shall be converted into and represent a number of Cardinal
     Common Shares equal to the Exchange Ratio (as defined in Section 2.2(a)).

          (c) Each share of capital stock of Allegiance held in the treasury of
     Allegiance shall be cancelled and retired and no payment shall be made in
     respect thereof.

          2.2 Exchange Ratio; Fractional Shares; Adjustments.

          (a) The "Exchange Ratio" shall be equal to 0.4150.1*

- --------------------------
* In light of record date of October 9, 1998 for 3-2 stock split of RED Common
Shares, Exchange Ratio will thereafter be adjusted to 0.6225.

                                      -3-
<PAGE>

          (b) No certificates for fractional Cardinal Common Shares shall be
     issued as a result of the conversion provided for in Section 2.1(b) and
     such fractional share interests will not entitle the owner thereof to vote
     or have any rights of a Cardinal Shareholder (as defined in Section 3.2) or
     a holder of Cardinal Common Shares.

          (c) In lieu of any such fractional Cardinal Common Shares, the holder
     of a certificate previously evidencing Allegiance Common Stock, upon
     presentation of such fractional interest represented by an appropriate
     certificate for Allegiance Common Stock to the Exchange Agent (as defined
     in Section 2.3(a) pursuant to Section 2.3, shall be entitled to receive a
     cash payment therefor in an amount equal to the value (determined with
     reference to the closing price of Cardinal Common Shares as reported on the
     New York Stock Exchange ("NYSE") Composite Tape ("NYSE Composite Tape") on
     the last full trading day immediately prior to the Closing Date) of such
     fractional interest. Such payment with respect to fractional shares is
     merely intended to provide a mechanical rounding off of, and is not a
     separately bargained for, consideration. If more than one certificate
     representing shares of Allegiance Common Stock shall be surrendered for the
     account of the same holder, the number of Cardinal Common Shares for which
     certificates have been surrendered shall be computed on the basis of the
     aggregate number of shares represented by the certificates so surrendered.

          (d) In the event that prior to the Effective Time Cardinal shall
     declare a stock dividend or other distribution payable in Cardinal Common
     Shares or securities convertible into Cardinal Common Shares, or effect a
     stock split, reclassification, combination or other change with respect to
     Cardinal Common Shares, the Exchange Ratio set forth in this Section 2.2
     shall be adjusted to reflect such dividend, distribution, stock split,
     reclassification, combination or other change.

          2.3 Exchange of Certificates.

          (a) Exchange Agent. Promptly following the Effective Time, Cardinal
     shall deposit with ChaseMellon Stockholder Services, Inc. or such other
     exchange agent as may be designated by Cardinal (the "Exchange Agent"), for
     the benefit of Allegiance Stockholders, for exchange in accordance with
     this Section 2.3, certificates representing Cardinal Common Shares issuable
     pursuant to Section 2.1 in exchange for outstanding shares of Allegiance
     Common Stock and shall from time-to-time deposit cash in an amount
     reasonably expected to be paid pursuant to Section 2.2 (such Cardinal
     Common Shares and cash, together with any dividends or distributions with
     respect thereto, the "Exchange Fund").

          (b) Exchange Procedures. As soon as practicable after the Effective
     Time, the Exchange Agent shall mail to each holder of record of a
     certificate or certificates (the "Certificates") that immediately prior to
     the Effective Time represented outstanding shares of Allegiance Common
     Stock whose shares were converted into the right to receive Cardinal Common
     Shares pursuant to Section 2.1(b), (i) a letter of transmittal (which shall
     specify that delivery shall be effected, and risk of loss and title to the
     Certificates shall 


                                      -4-
<PAGE>

     pass, only upon delivery of the Certificates to the Exchange Agent, and
     shall be in such form and have such other customary provisions as Cardinal
     may reasonably specify) and (ii) instructions for effecting the surrender
     of the Certificates in exchange for certificates representing Cardinal
     Common Shares. Upon surrender of a Certificate for cancellation to the
     Exchange Agent, together with a duly executed letter of transmittal, the
     holder of such Certificate shall be entitled to receive in exchange
     therefor (i) a certificate or certificates representing that whole number
     of Cardinal Common Shares which such holder has the right to receive
     pursuant to Section 2.1 in such denominations and registered in such names
     as such holder may request and (ii) a check representing the amount of cash
     in lieu of fractional shares, if any, and unpaid dividends and
     distributions, if any, which such holder has the right to receive pursuant
     to the provisions of this Article II, after giving effect to any required
     withholding tax. The shares represented by the Certificate so surrendered
     shall forthwith be cancelled. No interest will be paid or accrued on the
     cash in lieu of fractional shares, if any, and unpaid dividends and
     distributions, if any, payable to holders of shares of Allegiance Common
     Stock. In the event of a transfer of ownership of shares of Allegiance
     Common Stock that is not registered on the transfer records of Allegiance,
     a certificate representing the proper number of Cardinal Common Shares,
     together with a check for the cash to be paid in lieu of fractional shares,
     if any, and unpaid dividends and distributions, if any, may be issued to
     such transferee if the Certificate representing such shares of Allegiance
     Common Stock held by such transferee is presented to the Exchange Agent,
     accompanied by all documents required to evidence and effect such transfer
     and to evidence that any applicable stock transfer taxes have been paid.
     Until surrendered as contemplated by this Section 2.3, each Certificate
     shall be deemed at any time after the Effective Time to represent only the
     right to receive upon surrender a certificate representing Cardinal Common
     Shares and cash in lieu of fractional shares, if any, and unpaid dividends
     and distributions, if any, as provided in this Article II. If any
     Certificate shall have been lost, stolen or destroyed, upon the making of
     an affidavit of that fact by the person claiming such Certificate to be
     lost, stolen or destroyed and, if required by Cardinal, the posting by such
     person of a bond in such reasonable amount as Cardinal may direct as
     indemnity against any claim that may be made against it with respect to
     such Certificate, the Exchange Agent will deliver in exchange for such
     lost, stolen or destroyed Certificate, a certificate representing the
     proper number of Cardinal Common Shares, together with a check for the cash
     to be paid in lieu of fractional shares, if any, with respect to the shares
     of Allegiance Common Stock formerly represented thereby, and unpaid
     dividends and distributions on Cardinal Common Shares, if any, as provided
     in this Article II.

          (c) Distributions with Respect to Unexchanged Shares. Notwithstanding
     any other provisions of this Agreement, no dividends or other distributions
     declared or made after the Effective Time with respect to Cardinal Common
     Shares having a record date after the Effective Time shall be paid to the
     holder of any unsurrendered Certificate, and no cash payment in lieu of
     fractional shares shall be paid to any such holder, until the holder shall
     surrender such Certificate as provided in this Section 2.3. Subject to the
     effect of Applicable Laws (as defined in Section 3.9), following surrender
     of any such Certificate, there shall be paid to the holder of the
     certificates representing whole Cardinal Common Shares issued in exchange
     therefor, without interest, (i) at the time of such surrender, the 


                                      -5-
<PAGE>

     amount of dividends or other distributions with a record date after the
     Effective Time theretofore payable with respect to such whole Cardinal
     Common Shares and not paid, less the amount of any withholding taxes that
     may be required thereon, and (ii) at the appropriate payment date
     subsequent to surrender, the amount of dividends or other distributions
     with a record date after the Effective Time but prior to surrender and a
     payment date subsequent to surrender payable with respect to such whole
     Cardinal Common Shares, less the amount of any withholding taxes which may
     be required thereon.

          (d) No Further Ownership Rights in Allegiance Common Stock. All
     Cardinal Common Shares issued upon surrender of Certificates in accordance
     with the terms hereof (including any cash paid pursuant to this Article II)
     shall be deemed to have been issued in full satisfaction of all rights
     pertaining to such shares of Allegiance Common Stock represented thereby,
     and, as of the Effective Time, the stock transfer books of Allegiance shall
     be closed and there shall be no further registration of transfers on the
     stock transfer books of Allegiance of shares of Allegiance Common Stock
     outstanding immediately prior to the Effective Time. If, after the
     Effective Time, Certificates are presented to the Surviving Corporation for
     any reason, they shall be cancelled and exchanged as provided in this
     Section 2.3. Certificates surrendered for exchange by any person
     constituting an "affiliate" of Allegiance for purposes of Rule 145(c) under
     the Securities Act of 1933, as amended (together with the rules and
     regulations thereunder, the "Securities Act"), shall not be exchanged until
     Cardinal has received written undertakings from such person in the form
     attached as Exhibit A to this Agreement.

          (e) Termination of Exchange Fund. Any portion of the Exchange Fund
     that remains undistributed to Allegiance Stockholders six months after the
     date of the mailing required by Section 2.3(b) shall be delivered to
     Cardinal, upon demand thereby, and holders of Certificates previously
     representing shares of Allegiance Common Stock who have not theretofore
     complied with this Section 2.3 shall thereafter look only to Cardinal for
     payment of any claim to Cardinal Common Shares, cash in lieu of fractional
     shares thereof, or dividends or distributions, if any, in respect thereof.

          (f) No Liability. None of Cardinal, the Surviving Corporation or the
     Exchange Agent shall be liable to any person in respect of any shares of
     Allegiance Common Stock (or dividends or distributions with respect
     thereto) or cash from the Exchange Fund delivered to a public official
     pursuant to any applicable abandoned property, escheat or similar law. If
     any Certificates shall not have been surrendered prior to seven years after
     the Effective Time (or immediately prior to such earlier date on which any
     cash, any cash in lieu of fractional shares or any dividends or
     distributions with respect to whole shares of Allegiance Common Stock in
     respect of such Certificate would otherwise escheat to or become the
     property of any Governmental Authority (as defined in Section 3.4(d))), any
     such cash, dividends or distributions in respect of such Certificate shall,
     to the extent permitted by Applicable Laws, become the property of
     Cardinal, free and clear of all claims or interest of any person previously
     entitled thereto.


                                      -6-
<PAGE>

          (g) Investment of Exchange Fund. The Exchange Agent shall invest any
     cash included in the Exchange Fund, as directed by Cardinal, on a daily
     basis. Any interest and other income resulting from such investments shall
     be paid to Cardinal upon termination of the Exchange Fund pursuant to
     Section 2.3(e).

          (h) Withholding Rights. Each of the Surviving Corporation and Cardinal
     shall be entitled to deduct and withhold from the consideration otherwise
     payable pursuant to this Agreement to any holder of shares of Allegiance
     Common Stock such amounts as it is required to deduct and withhold with
     respect to the making of such payment under the Code and the rules and
     regulations promulgated thereunder, or any provision of state, local or
     foreign tax law. To the extent that amounts are so withheld by the
     Surviving Corporation or Cardinal, as the case may be, such withheld
     amounts shall be treated for all purposes of this Agreement as having been
     paid to the holder of the shares of Allegiance Common Stock in respect of
     which such deduction and withholding was made by the Surviving Corporation
     or Cardinal, as the case may be.

          2.4 Treatment of Stock Options and Employee Stock Purchase Plan.

          (a) Prior to the Effective Time, Cardinal and Allegiance shall take
     all such actions as may be necessary to cause each unexpired and
     unexercised outstanding option granted or issued under stock option plans
     of Allegiance in effect on the date hereof (each, an "Allegiance Option")
     to be automatically converted at the Effective Time into an option (a
     "Cardinal Exchange Option") to purchase that number of Cardinal Common
     Shares equal to the number of shares of Allegiance Common Stock subject to
     the Allegiance Option immediately prior to the Effective Time (without
     regard to any actual restrictions on exerciseability) multiplied by the
     Exchange Ratio (and rounded to the nearest share), with an exercise price
     per share equal to the exercise price per share that existed under the
     corresponding Allegiance Option divided by the Exchange Ratio (and rounded
     to the nearest cent), and with other terms and conditions that are the same
     as the terms and conditions of such Allegiance Option immediately before
     the Effective Time; provided that with respect to any Allegiance Option
     that is an "incentive stock option" within the meaning of Section 422 of
     the Code, the foregoing conversion shall be carried out in a manner
     satisfying the requirements of Section 424(a) of the Code.

          (b) Prior to the Effective Time, Cardinal and Allegiance shall take
     all such actions as may be necessary to cause all rights outstanding under
     the Allegiance Employee Stock Purchase Plan (the "ESPP") as of the
     Effective Time to purchase shares of Allegiance Common Stock (each, an
     "ESPP Right") to be automatically converted at the Effective Time into a
     right (a "Cardinal Right") to purchase that number of Cardinal Common
     Shares equal to the number of shares of Allegiance Common Stock subject to
     the ESPP Right immediately prior to the Effective Time (without regard to
     any actual restrictions on exerciseability) multiplied by the Exchange
     Ratio (and rounded down to the nearest share), with a Subscription Price
     (as defined in the ESPP) equal to the Subscription Price that existed under
     the corresponding ESPP Right divided by the Exchange Ratio (and rounded up
     to the nearest cent), and with other terms and conditions that are the same
     as

                                      -7-
<PAGE>



     the terms and conditions of such ESPP Right immediately before the
     Effective Time; provided that the foregoing conversion shall be carried out
     in a manner satisfying the requirements of Section 424(a) of the Code.

          (c) In connection with the issuance of Cardinal Exchange Options and
     Cardinal Rights, Cardinal shall (i) reserve for issuance the number of
     Cardinal Common Shares that will become subject to Cardinal Exchange
     Options and Cardinal Rights pursuant to this Section 2.4 and (ii) from and
     after the Effective Time, upon exercise of Cardinal Exchange Options and
     Cardinal Rights, make available for issuance all Cardinal Common Shares
     covered thereby, subject to the terms and conditions applicable thereto.

          (d) Allegiance agrees to issue treasury shares of Allegiance, to the
     extent available, upon the exercise of Allegiance Options and ESPP Rights
     prior to the Effective Time.

          (e) Cardinal agrees to use its reasonable efforts to file with the
     Securities and Exchange Commission (the "Commission") within 30 days after
     the Closing Date a registration statement on Form S-8 or other appropriate
     form under the Securities Act to register Cardinal Common Shares issuable
     upon exercise of the Cardinal Exchange Options and Cardinal Rights and to
     use its reasonable efforts to cause such registration statement to remain
     effective until the exercise or expiration of such options and rights.


                                  ARTICLE III.

             REPRESENTATIONS AND WARRANTIES OF CARDINAL AND SUBCORP

          In order to induce Allegiance to enter into this Agreement, Cardinal
and Subcorp hereby represent and warrant to Allegiance that the statements
contained in this Article III are true, correct and complete.

          3.1 Organization and Standing. Each of Cardinal and Subcorp is a
corporation duly organized, validly existing and in good standing under the laws
of its state of incorporation with full corporate power and authority to own,
lease, use and operate its properties and to conduct its business as and where
now owned, leased, used, operated and conducted. Each of Cardinal and Subcorp is
duly qualified to do business and is in good standing in each jurisdiction in
which the nature of the business conducted by it or the property it owns, leases
or operates, requires it to so qualify, except where the failure to be so
qualified or in good standing in such jurisdiction would not have a Material
Adverse Effect (as defined in Section 8.3) on Cardinal or Subcorp, as the case
may be. Cardinal is not in default in the performance, observance or fulfillment
of any provision of the Cardinal Amended and Restated Articles of Incorporation,
as amended (the "Cardinal Articles"), or the Cardinal Code of Regulations, as
amended and restated (the "Cardinal Code of Regulations"), and Subcorp is not in
default in the performance, observance or fulfillment of any provisions of its
Certificate of Incorporation or Bylaws. Cardinal has heretofore furnished to
Allegiance a complete and correct copy of (i) the Cardinal


                                      -8-
<PAGE>

Articles and the Cardinal Code of Regulations, each as in effect as of the date
of this Agreement and as proposed to be amended in the manner described in
Cardinal's proxy statement dated September 28, 1998, and (ii) the Certificate of
Incorporation of Subcorp.

          3.2 Corporate Power and Authority. Each of Cardinal and Subcorp has
all requisite corporate power and authority to enter into and deliver this
Agreement, subject to approval of the issuance of Cardinal Common Shares
issuable in the Merger and the transactions contemplated hereby by the holders
of Cardinal Common Shares (the "Cardinal Shareholders") (the "Share Issuance"),
to perform its obligations hereunder and to consummate the transactions
contemplated by this Agreement. The execution and delivery of this Agreement and
the consummation of the transactions contemplated hereby by Cardinal and Subcorp
have been duly authorized by all necessary corporate action on the part of each
of Cardinal and Subcorp, subject to approval by the Cardinal Shareholders of the
Share Issuance. This Agreement has been duly executed and delivered by each of
Cardinal and Subcorp, and constitutes the legal, valid and binding obligation of
each of Subcorp and Cardinal enforceable against each of them in accordance with
its terms.

          3.3 Capitalization of Cardinal and Subcorp.

          (a) As of October 7, 1998, Cardinal's authorized capital stock
     consisted solely of (A) 300,000,000 common shares, without par value
     ("Cardinal Common Shares"), of which (i) 133,797,688 shares were issued and
     outstanding, (ii) 289,434 shares were issued and held in treasury (which
     does not include Cardinal Common Shares reserved for issuance as set forth
     in clause (a)(iii) below) and (iii) 6,984,410 shares were reserved for
     issuance upon the exercise or conversion of options, warrants or
     convertible securities granted or issuable by Cardinal, (B) 5,000,000 Class
     B common shares, without par value, none of which was issued and
     outstanding or reserved for issuance, and (C) 500,000 Non-Voting Preferred
     Shares, without par value, none of which was issued and outstanding or
     reserved for issuance. Each outstanding share of Cardinal capital stock is,
     and all Cardinal Common Shares to be issued in connection with the Merger
     will be, duly authorized and validly issued, fully paid and nonassessable,
     and each outstanding share of Cardinal capital stock has not been, and all
     Cardinal Common Shares to be issued in connection with the Merger will not
     be, issued in violation of any preemptive or similar rights. As of the date
     hereof, other than as set forth in the first sentence hereof or in Section
     3.3 to the disclosure schedule delivered by Cardinal to Allegiance and
     dated the date hereof (the "Cardinal Disclosure Schedule"), there are no
     outstanding subscriptions, options, warrants, puts, calls, agreements,
     understandings, claims or other commitments or rights of any type relating
     to the issuance, sale, repurchase, transfer or registration by Cardinal of
     any equity securities of Cardinal, nor are there outstanding any securities
     that are convertible into or exchangeable for any shares of capital stock
     of Cardinal and Cardinal has no obligation of any kind to issue any
     additional securities. The Cardinal Common Shares (including those Cardinal
     Common Shares to be issued in the Merger) are registered under the
     Securities Exchange Act of 1934, as amended (together with the rules and
     regulations thereunder, the "Exchange Act"). Except as set forth in Section
     3.3 to the Cardinal Disclosure Schedule, as of the date hereof, Cardinal
     has not agreed to register any securities under the Securities 


                                      -9-
<PAGE>

     Act or under any state securities law or granted registration rights to any
     person or entity (which rights are currently exerciseable).

          (b) Subcorp's authorized capital stock consists solely of 1,000 shares
     of Subcorp Common Stock, of which, as of the date hereof, 100 were issued
     and outstanding and none were reserved for issuance. As of the date hereof,
     all of the outstanding shares of Subcorp Common Stock are owned free and
     clear of any liens, claims or encumbrances by Cardinal.

          3.4 Conflicts; Consents and Approval. Neither the execution and
delivery of this Agreement by Cardinal or Subcorp nor the consummation of the
transactions contemplated hereby will:

          (a) conflict with, or result in a breach of any provision of the
     Cardinal Articles or the Cardinal Code of Regulations or the Certificate of
     Incorporation or Bylaws of Subcorp, subject to approval by the Cardinal
     Shareholders of the amendment to the Cardinal Articles set forth in
     Cardinal's proxy statement dated September 28, 1998;

          (b) violate, or conflict with, or result in a breach of any provision
     of, or constitute a default (or an event that, with the giving of notice,
     the passage of time or otherwise, would constitute a default) under, or
     entitle any party (with the giving of notice, the passage of time or
     otherwise) to terminate, accelerate, modify or call a default under, or
     result in the creation of any lien, security interest, charge or
     encumbrance upon any of the properties or assets of Cardinal or any of its
     subsidiaries under, any of the terms, conditions or provisions of any note,
     bond, mortgage, indenture, deed of trust, license, contract, undertaking,
     agreement, lease or other instrument or obligation to which Cardinal or any
     of its subsidiaries is a party;

          (c) violate any order, writ, injunction, decree, statute, rule or
     regulation applicable to Cardinal or any of its subsidiaries or any of
     their respective properties or assets; or

          (d) require any action or consent or approval of, or review by, or
     registration or filing by Cardinal or any of its affiliates with, any third
     party or any local, domestic, foreign or multi-national court, arbitral
     tribunal, administrative agency or commission or other governmental or
     regulatory body, agency, instrumentality or authority (a "Governmental
     Authority"), other than (i) approval by the Cardinal Shareholders of the
     Share Issuance, (ii) authorization for inclusion of the Cardinal Common
     Shares to be issued in the Merger and the transactions contemplated hereby
     on the NYSE, subject to official notice of issuance, (iii) actions required
     by the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended
     (together with the rules and regulations thereunder, the "HSR Act"), (iv)
     registrations or other actions required under federal and state securities
     laws as are contemplated by this Agreement, or (v) consents or approvals of
     any Governmental Authority set forth in Section 3.4 to the Cardinal
     Disclosure Schedule;

                                      -10-
<PAGE>

except in the case of clauses (b), (c) and (d) for any of the foregoing that
would not, individually or in the aggregate, have a Material Adverse Effect on
Cardinal or a material adverse effect on the ability of the parties to
consummate the transactions contemplated hereby.

          3.5 Brokerage and Finder's Fees. Except as set forth in Section 3.5 of
the Cardinal Disclosure Schedule, neither Cardinal nor any shareholder,
director, officer or employee thereof has incurred or will incur on behalf of
Cardinal any brokerage, finder's or similar fee in connection with the
transactions contemplated by this Agreement.

          3.6 Accounting Matters; Reorganization. To the best knowledge of
Cardinal (including its executive officers and directors) after due
investigation, neither Cardinal nor any of its affiliates has taken or agreed to
take any action that (without giving effect to any actions taken or agreed to be
taken by Allegiance or any of its affiliates) would (a) prevent Cardinal from
accounting for the business combination to be effected by the Merger as a
pooling-of-interests for financial reporting purposes or (b) prevent the Merger
from constituting a "reorganization" qualifying under the provisions of Section
368(a) of the Code.

          3.7 Cardinal SEC Documents. Cardinal has timely filed with the
Commission all forms, reports, schedules, statements and other documents
required to be filed by it since January 1, 1996 under the Exchange Act or the
Securities Act (such documents, as supplemented and amended since the time of
filing, collectively, the "Cardinal SEC Documents"). The Cardinal SEC Documents,
including, without limitation, any financial statements or schedules included
therein, at the time filed (and, in the case of registration statements and
proxy statements, on the dates of effectiveness and the dates of mailing,
respectively and, in the case of any Cardinal SEC Document amended or superseded
by a filing prior to the date of this Agreement, then on the date of such
amending or superseding filing) (a) did not contain any untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not misleading, and (b) complied in all material
respects with the applicable requirements of the Exchange Act and the Securities
Act, as the case may be. The financial statements of Cardinal included in the
Cardinal SEC Documents at the time filed (and, in the case of registration
statements and proxy statements, on the dates of effectiveness and the dates of
mailing, respectively, and, in the case of any Cardinal SEC Document amended or
superseded by a filing prior to the date of this Agreement, then on the date of
such amending or superseding filing) complied as to form in all material
respects with applicable accounting requirements and with the published rules
and regulations of the Commission with respect thereto, were prepared in
accordance with generally accepted accounting principles applied on a consistent
basis during the periods involved (except as may be indicated in the notes
thereto or, in the case of unaudited statements, as permitted by Form 10-Q of
the Commission), and fairly present (subject, in the case of unaudited
statements, to normal, recurring audit adjustments) the consolidated financial
position of Cardinal and its consolidated subsidiaries as at the dates thereof
and the consolidated results of their operations and cash flows for the periods
then ended.

          3.8 Registration Statement; Joint Proxy Statement. None of the
information provided in writing by Cardinal for inclusion in the registration
statement on Form S-4 (such


                                      -11-
<PAGE>

registration statement as amended, supplemented or modified, the "Registration
Statement") to be filed with the Commission by Cardinal under the Securities
Act, including the prospectus relating to Cardinal Common Shares to be issued in
the Merger (as amended, supplemented or modified, the "Prospectus") and the
joint proxy statement and form of proxies relating to the vote of Allegiance
Stockholders with respect to the Merger and the vote of Cardinal Shareholders
with respect to the Share Issuance (as amended, supplemented or modified, the
"Joint Proxy Statement"), at the time the Registration Statement becomes
effective or, in the case of the Joint Proxy Statement, at the date of mailing
and at the date of the Allegiance Stockholders Meeting (as defined in Section
5.3(a)) or the Cardinal Shareholders Meeting (as defined in Section 5.2(a)) to
consider the Merger and the transactions contemplated thereby, will contain any
untrue statement of a material fact or omit to state any material fact required
to be stated therein or necessary in order to make the statements therein, in
light of the circumstances under which they are made, not misleading. The
Registration Statement and Joint Proxy Statement, except for such portions
thereof that relate only to Allegiance, will each comply as to form in all
material respects with the provisions of the Securities Act and the Exchange
Act.

          3.9 Compliance with Law. Except as set forth in Section 3.9 to the
Cardinal Disclosure Schedule, Cardinal is in compliance, and at all times since
October 1, 1996 has been in compliance, with all applicable laws, statutes,
orders, rules, regulations, policies or guidelines promulgated, or judgments,
decisions or orders entered by any Governmental Authority (collectively,
"Applicable Laws") relating to Cardinal or its business or properties, except
where the failure to be in compliance with such Applicable Laws, individually or
in the aggregate, would not reasonably be expected to have a Material Adverse
Effect on Cardinal. Except as set forth in Section 3.9 to the Cardinal
Disclosure Schedule, no investigation or review by any Governmental Authority
with respect to Cardinal or its subsidiaries is pending, or, to the knowledge of
Cardinal, threatened, nor has any Governmental Authority indicated in writing an
intention to conduct the same, other than those the outcome of which would not
reasonably be expected to have a Material Adverse Effect on Cardinal.

          3.10 Litigation. Except as set forth in Section 3.10 to the Cardinal
Disclosure Schedule or in the Cardinal SEC Documents, there is no suit, claim,
action, proceeding, hearing, notice of violation, demand letter or investigation
(an "Action") pending or, to the knowledge of Cardinal (or its executive
officers or directors), threatened against Cardinal or any executive officer or
director of Cardinal that, individually or in the aggregate, would reasonably be
expected to have a Material Adverse Effect on Cardinal or a material adverse
effect on the ability of Cardinal to consummate the transactions contemplated
hereby. Cardinal is not subject to any outstanding order, writ, injunction or
decree that, individually or in the aggregate, insofar as can be reasonably
foreseen, would have a Material Adverse Effect on Cardinal or a material adverse
effect on the ability of Cardinal to consummate the transactions contemplated
hereby. Except as set forth in Section 3.10 to the Cardinal Disclosure Schedule,
since October 1, 1996, Cardinal has not been subject to any outstanding order,
writ, injunction or decree relating to Cardinal's method of doing business or
its relationship with past, existing or future users or purchasers of any goods
or services of Cardinal.

                                      -12-
<PAGE>

          3.11 Board Recommendation; Required Vote. The Board of Directors of
Cardinal, at a meeting duly called and held, has by unanimous vote of those
directors present (i) determined that this Agreement and the transactions
contemplated hereby, including the Merger, taken together, are fair to and in
the best interests of Cardinal and the Cardinal Shareholders, and (ii) resolved
to recommend that the Cardinal Shareholders approve and authorize the Share
Issuance. The affirmative vote of holders of a majority of the Cardinal Common
Shares outstanding to approve the Share Issuance is the only vote of the
Cardinal Shareholders necessary to adopt this Agreement and approve the
transactions contemplated hereby.

          3.12 No Material Adverse Change. Except as set forth in Section 3.12
to the Cardinal Disclosure Schedule, or as disclosed in the Cardinal SEC
Documents filed prior to the date of this Agreement, since June 30, 1998, there
has been no material adverse change in the business, results of operations or
financial condition of Cardinal and its subsidiaries taken as a whole other than
any change relating to the economy, the securities markets in general or the
industries generally in which Cardinal and its subsidiaries operate, or any
event, occurrence or development that would reasonably be expected to have a
Material Adverse Effect on Cardinal or a material adverse effect on the ability
of Cardinal to consummate the transactions contemplated hereby.

          3.13 Undisclosed Liabilities. Except (i) as and to the extent
disclosed or reserved against on the balance sheet of Cardinal as of June 30,
1998 included in the Cardinal SEC Documents, (ii) as incurred after the date
thereof in the ordinary course of business consistent with prior practice and
not prohibited by this Agreement, or (iii) as set forth in Section 3.13 to the
Cardinal Disclosure Schedule, Cardinal does not have any liabilities or
obligations of any nature, whether known or unknown, absolute, accrued,
contingent or otherwise and whether due or to become due, that, individually or
in the aggregate, have had or would reasonably be expected to have a Material
Adverse Effect on Cardinal.


                                   ARTICLE IV.

                  REPRESENTATIONS AND WARRANTIES OF ALLEGIANCE

          In order to induce Subcorp and Cardinal to enter into this Agreement,
Allegiance hereby represents and warrants to Cardinal and Subcorp that the
statements contained in this Article IV are true, correct and complete.

          4.1 Organization and Standing. Allegiance is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware with full corporate power and authority to own, lease, use and operate
its properties and to conduct its business as and where now owned, leased, used,
operated and conducted. Each of Allegiance and each subsidiary of Allegiance is
duly qualified to do business and in good standing in each jurisdiction in which
the nature of the business conducted by it or the property it owns, leases or
operates requires it to so qualify, except where the failure to be so qualified
or in good standing in such jurisdiction would not have a Material Adverse
Effect on Allegiance. Allegiance is not in default


                                      -13-
<PAGE>

in the performance, observance or fulfillment of any provision of its Amended
and Restated Certificate of Incorporation (the "Allegiance Certificate"), or its
Bylaws, as in effect on the date hereof (the "Allegiance Bylaws"). Allegiance
has heretofore furnished to Cardinal a complete and correct copy of the
Allegiance Certificate and the Allegiance Bylaws. Listed in Section 4.1 to the
disclosure schedule delivered by Allegiance to Cardinal and dated the date
hereof (the "Allegiance Disclosure Schedule") is each jurisdiction in which
Allegiance or a subsidiary of Allegiance is qualified to do business and,
whether Allegiance (or the subsidiaries of Allegiance) is in good standing as of
the date of the Agreement.

          4.2 Subsidiaries. Allegiance does not own, directly or indirectly, any
equity or other ownership interest in any corporation, partnership, joint
venture or other entity or enterprise, except for (i) those that, individually
or in the aggregate, are immaterial and (ii) the subsidiaries set forth in
Section 4.2 to the Allegiance Disclosure Schedule. Except as set forth in
Section 4.2 to the Allegiance Disclosure Schedule, Allegiance is not subject to
any obligation or requirement to provide funds to or make any investment (in the
form of a loan, capital contribution or otherwise) in any such entity or any
other person. Except as set forth in Section 4.2 to the Allegiance Disclosure
Schedule, and except for those that are, individually or in the aggregate,
immaterial, Allegiance owns, directly or indirectly, each of the outstanding
shares of capital stock (or other ownership interests having by their terms
ordinary voting power to elect a majority of directors or others performing
similar functions with respect to such subsidiary) of each of Allegiance's
subsidiaries. Each of the outstanding shares of capital stock of each of
Allegiance's subsidiaries is duly authorized, validly issued, fully paid and
nonassessable, and is owned, directly or indirectly, by Allegiance free and
clear of all liens, pledges, security interests, claims or other encumbrances.
The following information for each subsidiary of Allegiance (other than those
that are, individually or in the aggregate, immaterial) is set forth in Section
4.2 to the Allegiance Disclosure Schedule, as applicable: (i) its name and
jurisdiction of incorporation or organization; (ii) its authorized capital stock
or share capital; and (iii) the number of issued and outstanding shares of
capital stock or share capital and the record owner(s) thereof. Other than as
set forth in Section 4.2 to the Allegiance Disclosure Schedule, there are no
outstanding subscriptions, options, warrants, puts, calls, agreements,
understandings, claims or other commitments or rights of any type relating to
the issuance, sale or transfer of any securities of any subsidiary of Allegiance
(other than those that are, individually or in the aggregate, immaterial), nor
are there outstanding any securities that are convertible into or exchangeable
for any shares of capital stock of any subsidiary of Allegiance, and neither
Allegiance nor any subsidiary of Allegiance has any obligation of any kind to
issue any additional securities or to pay for or repurchase any securities of
any subsidiary of Allegiance or any predecessor thereof.

          4.3 Corporate Power and Authority. Allegiance has all requisite
corporate power and authority to enter into and deliver this Agreement, to
perform its obligations hereunder and, subject to authorization of the Merger
and the transactions contemplated hereby by Allegiance Stockholders, to
consummate the transactions contemplated by this Agreement. The execution and
delivery of this Agreement by Allegiance have been duly authorized by all
necessary corporate action on the part of Allegiance, subject to authorization
of the Merger and the transactions contemplated hereby by Allegiance
Stockholders. This Agreement has been


                                      -14-
<PAGE>

duly executed and delivered by Allegiance and constitutes the legal, valid and
binding obligation of Allegiance enforceable against it in accordance with its
terms.

          4.4 Capitalization of Allegiance. As of September 30, 1998,
Allegiance's authorized capital stock consisted solely of (a) 200,000,000 shares
of common stock, par value $1.00 per share ("Allegiance Common Stock"), of which
(i) 111,982,604 shares were issued and outstanding, (ii) 4,249,117 shares were
issued and held in treasury (which does not include shares of Allegiance Common
Stock reserved for issuance set forth in clause (iii) below), (iii) 17,962,765
shares were reserved for issuance upon the exercise of outstanding Allegiance
Options, and (iv) 22,284,538 shares of Allegiance Common Stock were reserved for
future issuance under the Stock Option Agreement dated October 8, 1998 between
Cardinal and Allegiance (the "Allegiance Stock Option Agreement"); and (b)
20,000,000 shares of preferred stock, par value $.01 per share ("Allegiance
Preferred Stock"), of which (i) none was issued and outstanding, and (ii)
2,000,000 shares have been designated as Series A Junior Participating Preferred
Stock (the "Series A Preferred Stock") reserved for issuance pursuant to the
rights issued under the Allegiance Rights Agreement (as defined in Section
4.23). Since September 30, 1998, Allegiance has not issued any additional shares
of capital stock except for the issuance of Allegiance Common Stock in
connection with the exercise of Allegiance Options or ESPP Rights. Each
outstanding share of Allegiance capital stock is duly authorized and validly
issued, fully paid and nonassessable, and has not been issued in violation of
any preemptive or similar rights. Other than as set forth in the first sentence
hereof, in Section 4.4 to the Allegiance Disclosure Schedule or as contemplated
by the Allegiance Stock Option Agreement, there are no outstanding
subscriptions, options, warrants, puts, calls, agreements, understandings,
claims or other commitments or rights of any type relating to the issuance,
sale, repurchase or transfer of any securities of Allegiance, nor are there
outstanding any securities which are convertible into or exchangeable for any
shares of capital stock of Allegiance, and neither Allegiance nor any subsidiary
of Allegiance has any obligation of any kind to issue any additional securities
or to pay for or repurchase any securities of Allegiance or any predecessor. The
issuance and sale of all of the shares of capital stock described in this
Section 4.4 have been in compliance with federal and state securities laws.
Allegiance has previously provided Cardinal with a schedule setting forth the
names of, and the number of shares of each class (including the number of shares
issuable upon exercise of Allegiance Options and the exercise price and vesting
schedule with respect thereto) and the number of options held by, all holders of
options to purchase Allegiance capital stock. Section 4.4 to the Allegiance
Disclosure Schedule sets forth the average exercise price for outstanding
Allegiance Options. Except as set forth in Section 4.4 to the Allegiance
Disclosure Schedule, Allegiance has not agreed to register any securities under
the Securities Act or under any state securities law or granted registration
rights to any person or entity; copies of all such agreements have previously
been provided to Cardinal.

          4.5 Conflicts; Consents and Approvals. Neither the execution and
delivery of this Agreement or the Allegiance Stock Option Agreement by
Allegiance, nor the consummation of the transactions contemplated hereby or
thereby will:

          (a) conflict with, or result in a breach of any provision of, the
     Allegiance Certificate or the Allegiance Bylaws;

                                      -15-
<PAGE>

          (b) violate, or conflict with, or result in a breach of any provision
     of, or constitute a default (or an event that, with the giving of notice,
     the passage of time or otherwise, would constitute a default) under, or
     entitle any party (with the giving of notice, the passage of time or
     otherwise) to terminate, accelerate, modify or call a default under, or
     result in the creation of any lien, security interest, charge or
     encumbrance upon any of the properties or assets of Allegiance or any of
     its subsidiaries under, any of the terms, conditions or provisions of any
     note, bond, mortgage, indenture, deed of trust, license, contract,
     undertaking, agreement, lease or other instrument or obligation to which
     Allegiance or any of its subsidiaries is a party;

          (c) violate any order, writ, injunction, decree, statute, rule or
     regulation applicable to Allegiance or any of its subsidiaries or any of
     their respective properties or assets; or

          (d) require any action or consent or approval of, or review by, or
     registration or filing by Allegiance or any of its affiliates with, any
     third party or any Governmental Authority, other than (i) authorization of
     the Merger and the transactions contemplated hereby by Allegiance
     Stockholders, (ii) actions required by the HSR Act, (iii) registrations or
     other actions required under federal and state securities laws as are
     contemplated by this Agreement and (iv) consents or approvals of any
     Governmental Authority set forth in Section 4.5 to the Allegiance
     Disclosure Schedule;

except in the case of clause (b) which is set forth in Section 4.5(b) to the
Allegiance Disclosure Schedule or, individually or in the aggregate, are
otherwise immaterial, and in the case of clauses (c) and (d) for any of the
foregoing that would not, individually or in the aggregate, have a Material
Adverse Effect on Allegiance or a material adverse effect on the ability of the
parties to consummate the transaction contemplated hereby.

          4.6 No Material Adverse Change. Except as set forth in Section 4.6 to
the Allegiance Disclosure Schedule or disclosed in the Allegiance SEC Documents
(as defined in Section 4.7 hereof) filed prior to the date of this Agreement,
since December 31, 1997, there has been no material adverse change in the
business, results of operations or financial condition of Allegiance and its
subsidiaries taken as a whole other than any change relating to the economy, the
securities markets in general or the industries in which Allegiance and its
subsidiaries operate, or any event, occurrence or development that would
reasonably be expected to have a Material Adverse Effect on Allegiance or a
material adverse effect on the ability of Allegiance to consummate the
transactions contemplated hereby.

          4.7 Allegiance SEC Documents. Allegiance has timely filed with the
Commission all forms, reports, schedules, statements and other documents
required to be filed by it since June 1, 1996 under the Exchange Act or the
Securities Act (such documents, as supplemented and amended since the time of
filing, collectively, the "Allegiance SEC Documents"). The Allegiance SEC
Documents, including, without limitation, any financial statements or schedules
included therein, at the time filed (and, in the case of registration statements
and proxy statements, on the dates of effectiveness and the dates of mailing,

                                      -16-
<PAGE>

respectively and, in the case of any Allegiance SEC Document amended or
superseded by a filing prior to the date of this Agreement, then on the date of
such amending or superseding filing) (a) did not contain any untrue statement of
a material fact or omit to state a material fact required to be stated therein
or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading, and (b) complied in
all material respects with the applicable requirements of the Exchange Act and
the Securities Act, as the case may be. The financial statements of Allegiance
included in the Allegiance SEC Documents at the time filed (and, in the case of
registration statements and proxy statements, on the dates of effectiveness and
the dates of mailing, respectively, and, in the case of any Allegiance SEC
Document amended or superseded by a filing prior to the date of this Agreement,
then on the date of such amending or superseding filing) complied as to form in
all material respects with applicable accounting requirements and with the
published rules and regulations of the Commission with respect thereto, were
prepared in accordance with generally accepted accounting principles applied on
a consistent basis during the periods involved (except as may be indicated in
the notes thereto or, in the case of unaudited statements, as permitted by Form
10-Q of the Commission), and fairly present (subject, in the case of unaudited
statements, to normal, recurring audit adjustments) the consolidated financial
position of Allegiance and its consolidated subsidiaries as at the dates thereof
and the consolidated results of their operations and cash flows for the periods
then ended. No subsidiary of Allegiance is subject to the periodic reporting
requirements of the Exchange Act or required to file any form, report or other
document with the Commission, the NYSE, any other stock exchange or any other
comparable Governmental Authority.

          4.8 Taxes.

          (a) Allegiance and its subsidiaries have duly filed all material
federal, state, local and foreign income, franchise, excise, real and personal
property and other Tax Returns (as defined below) and reports (including, but
not limited to, those filed on a consolidated, combined or unitary basis)
required to have been filed by Allegiance or its subsidiaries prior to the date
hereof. All of the foregoing Tax Returns and reports are true and correct
(except for such inaccuracies that are, individually or in the aggregate,
immaterial), and Allegiance and its subsidiaries have within the time and manner
prescribed by Applicable Law paid or, prior to the Effective Time, will pay all
Taxes (as defined below), interest and penalties required to be paid in respect
of the periods covered by such returns or reports or otherwise due to any
federal, state, foreign, local or other taxing authority. Except as disclosed on
Section 4.8 to the Allegiance Disclosure Schedule, neither Allegiance nor any of
its subsidiaries have any material liability for any Taxes in excess of the
amounts so paid or reserves so established and neither Allegiance nor any of its
subsidiaries is delinquent in the payment of any material Tax. None of them has
requested or filed any document having the effect of causing any extension of
time within which to file any returns in respect of any fiscal year which have
not since been filed. No deficiencies for any material Tax have been proposed in
writing, asserted or assessed (tentatively or definitely), in each case, by any
taxing authority, against Allegiance or any of its subsidiaries for which there
are not adequate reserves. Neither Allegiance nor any of its subsidiaries is the
subject of any currently ongoing Tax audit except for those that are,
individually or in the aggregate, immaterial. As of the date of this Agreement,
there are no pending requests for 


                                      -17-
<PAGE>

waivers of the time to assess any material Tax, other than those made in the
ordinary course and for which payment has been made or there are adequate
reserves. Neither Allegiance nor any of its subsidiaries has waived any statute
of limitations in respect of Taxes or agreed to any extension of time with
respect to a Tax assessment or deficiency. There are no liens with respect to
Taxes upon any of the properties or assets, real or personal, tangible or
intangible of Allegiance or any of its subsidiaries (other than liens for Taxes
not yet due). To the knowledge of Allegiance, no claim has ever been made in
writing by an authority in a jurisdiction where none of Allegiance and its
subsidiaries files Tax Returns that Allegiance or any of its subsidiaries is or
may be subject to taxation by that jurisdiction. Allegiance has not filed an
election under Section 341(f) of the Code to be treated as a consenting
corporation.

          (b) Except as set forth in Section 4.8 to the Allegiance Disclosure
Schedule, neither Allegiance nor any of its subsidiaries is obligated by any
contract, agreement or other arrangement to indemnify any other person with
respect to material Taxes. Except as set forth in Section 4.8 to the Allegiance
Disclosure Schedule, neither Allegiance nor any of its subsidiaries are now or
have ever been a party to or bound by any agreement or arrangement (whether or
not written and including, without limitation, any arrangement required or
permitted by law) binding Allegiance or any of its subsidiaries that (i)
requires Allegiance or any of its subsidiaries to make any Tax payment to or for
the account of any other person, (ii) affords any other person the benefit of
any net operating loss, net capital loss, investment Tax credit, foreign Tax
credit, charitable deduction or any other credit or Tax attribute which could
reduce Taxes (including, without limitation, deductions and credits related to
alternative minimum Taxes) of Allegiance or any of its subsidiaries, or (iii)
requires or permits the transfer or assignment of income, revenues, receipts or
gains to Allegiance or any of its subsidiaries, from any other person.

          (c) Allegiance and its subsidiaries have withheld and paid all
material Taxes required to have been withheld and paid in connection with
amounts paid or owing to any employee, independent contractor, creditor,
shareholder or other third party.

          (d) "Tax Returns" means returns, reports and forms required to be
filed with any Governmental Authority of the United States or any other
jurisdiction responsible for the imposition or collection of Taxes.

          (e) "Taxes" means (i) all Taxes (whether federal, state, local or
foreign) based upon or measured by income and any other Tax whatsoever,
including, without limitation, gross receipts, profits, sales, use, occupation,
value added, ad valorem, transfer, franchise, withholding, payroll, employment,
excise, or property Taxes, together with any interest or penalties imposed with
respect thereto and (ii) any obligations under any agreements or arrangements
with respect to any Taxes described in clause (i) above.

          4.9 Compliance with Law. Allegiance is in compliance, and at all times
since October 1, 1996 has been in compliance, with all Applicable Laws relating
to Allegiance or its business or properties, except where the failure to be in
compliance with such Applicable Laws (individually or in the aggregate) would
not reasonably be expected to have a Material Adverse Effect on Allegiance. No
investigation or review by any Governmental Authority with respect to


                                      -18-
<PAGE>

Allegiance is pending, or, to the knowledge of Allegiance, threatened, nor has
any Governmental Authority indicated in writing an intention to conduct the
same, other than those the outcome of which would not reasonably be expected to
have a Material Adverse Effect on Allegiance.

          4.10 Intellectual Property.

          (a) "Intellectual Property" shall mean all intellectual property or
other proprietary rights of every kind, including, all domestic or foreign
patents, domestic or foreign patent applications, inventions (whether or not
patentable), processes, products, technologies, discoveries, copyrightable and
copyrighted works, apparatus, trade secrets, trademarks, trademark registrations
and applications, service marks, service mark registrations and applications,
trade names, trade dress, copyright registrations, customer lists, marketing and
customer information, licenses, technical information (whether confidential or
otherwise), software, and all documentation thereof.

          (b) Except as would not reasonably be expected to have a Material
Adverse Effect on Allegiance, Allegiance has the defensible right to use,
whether through ownership, licensing or otherwise, all Intellectual Property
necessary for the operation of the business of Allegiance in substantially the
same manner as such business is presently conducted. Except as set forth in
Section 4.10 to the Allegiance Disclosure Schedule (i) to the knowledge of
Allegiance, no written claim of invalidity or ownership with respect to any
material Intellectual Property has been made by a third party and such
Intellectual Property is not the subject of any threatened or pending Action;
(ii) no person or entity has given written notice to Allegiance that, with
respect to the material Intellectual Property, Allegiance or a licensee of
Allegiance is infringing or has infringed any domestic or foreign patent,
trademark, service mark, trade name, or copyright or design right, or has
misappropriated or improperly used or disclosed any trade secret, confidential
information or know-how; (iii) the making, using, selling, manufacturing,
marketing, licensing, reproduction, distribution, or publishing of any process,
machine, manufacture, composition of matter, or material related to any material
Intellectual Property, does not and will not infringe in any material respect
any domestic or foreign patent, trademark, service mark, trade name, copyright
or other intellectual property right of any third party, and does not and will
not involve the misappropriation or improper use or disclosure of any trade
secrets, confidential information or know-how of any third party; (iv) to
Allegiance's knowledge, no valid foreign or domestic patents or patent
applications exist that are adverse to the material interests of Allegiance; (v)
to Allegiance's knowledge there exists no (A) prior act that would void or
invalidate any material Intellectual Property or (B) conduct or use by
Allegiance or any third party that would void or invalidate any material
Intellectual Property; and (vi) the execution, delivery and performance of this
Agreement by Allegiance, and the consummation of the transactions contemplated
thereby, will not breach, violate or conflict with any material instrument or
agreement governing or contained within any material Intellectual Property, will
not cause the forfeiture or termination or give rise to a right of forfeiture or
termination of any of the material Intellectual Property or in any way impair
the right of Cardinal or the Surviving Corporation to make, use, sell, license
or dispose of, or to bring any action for the infringement of, any material
Intellectual Property.

                                      -19-
<PAGE>

          4.11 Registration Statement; Joint Proxy Statement. None of the
information provided in writing by Allegiance for inclusion in the Registration
Statement at the time it becomes effective or, in the case of the Joint Proxy
Statement, at the date of mailing and at the date of the Allegiance Stockholders
Meeting or the Cardinal Shareholders Meeting, will contain any untrue statement
of a material fact or omit to state a material fact required to be stated
therein or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading. The Registration
Statement and Joint Proxy Statement, except for such portions thereof that
relate only to Cardinal and its subsidiaries, will each comply as to form in all
material respects with the provisions of the Securities Act and the Exchange
Act.

          4.12 Litigation; Products Liability. Except as set forth in Section
4.12 to the Allegiance Disclosure Schedule, there is no Action pending or, to
the knowledge of Allegiance (or its executive officers or directors), threatened
against Allegiance or any executive officer or director of Allegiance that,
individually or in the aggregate, would reasonably be expected to have a
Material Adverse Effect on Allegiance or a material adverse effect on the
ability of Allegiance to consummate the transactions contemplated hereby.
Allegiance is not subject to any outstanding order, writ, injunction or decree
that, individually or in the aggregate, insofar as can be reasonably foreseen,
would have a Material Adverse Effect on Allegiance or a material adverse effect
on the ability of Allegiance to consummate the transactions contemplated hereby.
Except as set forth in Section 4.12 to the Allegiance Disclosure Schedule, since
October 1, 1996, Allegiance has not been subject to any outstanding order, writ,
injunction or decree relating to Allegiance's method of doing business or its
relationship with past, existing or future users or purchasers of any goods or
services of Allegiance. Except as set forth in Section 4.12 to the Allegiance
Disclosure Schedule, there is no Action presently pending or, to the knowledge
of Allegiance (or its executive officers or directors), threatened against
Allegiance relating to any alleged hazard or alleged defect in design,
manufacture, materials or workmanship, including, without limitation, any
failure to warn or alleged breach of express or implied warranty or
representation, relating to any product manufactured, distributed or sold by or
on behalf of Allegiance, which if adversely determined, would have a Material
Adverse Effect on Allegiance.

          4.13 Brokerage and Finder's Fees. Except for Allegiance's obligations
to Credit Suisse First Boston Corporation ("CSFB") (copies of all agreements
relating to such obligations having previously been provided to Cardinal),
neither Allegiance nor any stockholder, director, officer or employee thereof,
has incurred or will incur on behalf of Allegiance, any brokerage, finder's or
similar fee in connection with the transactions contemplated by this Agreement.

          4.14 Accounting Matters; Reorganization. To the best knowledge of
Allegiance (including its executive officers and directors) after due
investigation, neither Allegiance nor any of its affiliates has taken or agreed
to take any action that (without giving effect to any actions taken or agreed to
be taken by Cardinal or any of its affiliates) would (a) prevent Cardinal from
accounting for the business combination to be effected by the Merger as a
pooling-of-interests for financial reporting purposes or (b) prevent the Merger
from constituting a "reorganization" qualifying under the provisions of Section
368(a) of the Code.

                                      -20-
<PAGE>

          4.15 Employee Benefit Plans.

          (a) For purposes of this Section 4.15, the following terms have the
definitions given below:

          "Controlled Group Liability" means any and all liabilities under (i)
     Title IV of ERISA, (ii) section 302 of ERISA, (iii) sections 412 and 4971
     of the Code, (iv) the continuation coverage requirements of section 601 et
     seq. of ERISA and section 4980B of the Code, and (v) corresponding or
     similar provisions of foreign laws or regulations, in each case other than
     pursuant to the Plans listed in Section 4.15 of the Allegiance Disclosure
     Schedule.

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
     amended, and the regulations thereunder.

          "ERISA Affiliate" means, with respect to any entity, trade or
     business, any other entity, trade or business that is a member of a group
     described in Section 414(b), (c), (m) or (o) of the Code or Section
     4001(b)(1) of ERISA that includes the first entity, trade or business, or
     that is a member of the same "controlled group" as the first entity, trade
     or business pursuant to Section 4001(a)(14) of ERISA.

          "Plans" means all employee benefit plans, programs and other
     arrangements providing benefits to any employee or former employee in
     respect of services provided to Allegiance or beneficiary or dependent
     thereof, and whether covering one person or more than one person, sponsored
     or maintained by Allegiance or any of its subsidiaries or to which
     Allegiance or any of its subsidiaries contributes or is obligated to
     contribute. Without limiting the generality of the foregoing, the term
     "Plans" includes any defined benefit or defined contribution pension plan,
     profit sharing plan, stock ownership plan, deferred compensation agreement
     or arrangement, vacation pay, sickness, disability or death benefit plan
     (whether provided through insurance, on a funded or unfunded basis or
     otherwise), employee stock option or stock purchase plan, bonus or
     incentive plans or programs, severance pay plan policy, practice or
     agreement, employment agreement, retiree medical benefits plan and each
     other employee benefit plan, program or arrangement including, without
     limitation, each "employee benefit plan" within the meaning of Section 3(3)
     of ERISA.

          (b) Section 4.15 to the Allegiance Disclosure Schedule lists all Plans
covering individuals who are or were employed in the United States. With respect
to each Plan, Allegiance has made available to Cardinal a true, correct and
complete copy of the following (where applicable): (i) each writing constituting
a part of such Plan, including without limitation all plan documents, benefit
schedules, trust agreements, and insurance contracts and other funding vehicles;
(ii) the most recent Annual Report (Form 5500 Series) and accompanying schedule,
if any; (iii) the current summary plan description, if any; (iv) the most recent
annual financial report, if any; and (v) the most recent determination letter
from the Internal Revenue Service, if any.

                                      -21-
<PAGE>

          (c) The Internal Revenue Service has issued a favorable determination
letter with respect to each Plan that is intended to be a "qualified plan"
within the meaning of Section 401(a) of the Code (a "Qualified Plan") and there
are no existing circumstances nor any events that have occurred that could
adversely affect the qualified status of any Qualified Plan or the related
trust.

          (d) All contributions required to be made to any Plan by Applicable
Laws or by any plan document or other contractual undertaking, and all premiums
due or payable with respect to insurance policies funding any Plan, for any
period through the date hereof have been timely made or paid in full and through
the Closing Date will be timely made or paid in full.

          (e) Allegiance and its subsidiaries have complied, and are now in
compliance, in all material respects, with all provisions of ERISA, the Code and
all laws and regulations applicable to the Plans. Each Plan has been operated in
material compliance with its terms. There is not now, and there are no existing
circumstances that could reasonably be expected to give rise to, any requirement
for the posting of security with respect to a Plan or the imposition of any lien
on the assets of Allegiance or any of its subsidiaries under ERISA or the Code.

          (f) No Plan is subject to Title IV or Section 302 of ERISA or Section
412 or 4971 of the Code. No Plan is a "multiemployer plan" within the meaning of
Section 4001(a)(3) of ERISA (a "Multiemployer Plan") or a plan that has two or
more contributing sponsors at least two of whom are not under common control,
within the meaning of Section 4063 of ERISA (a "Multiple Employer Plan"). None
of Allegiance, its subsidiaries nor any of their respective ERISA Affiliates
has, at any time since October 1, 1996, contributed to or been obligated to
contribute to any Multiemployer Plan or Multiple Employer Plan.

          (g) There does not now exist, and to the knowledge of Allegiance,
there are no existing circumstances that could reasonably be expected to result
in any material Controlled Group Liability that would be a liability of
Allegiance or any of its subsidiaries following the Closing.

          (h) Except for health continuation coverage as required by Section
4980B of the Code or Part 6 of Title I of ERISA and except as set forth in
Section 4.15(h) to the Allegiance Disclosure Schedule, neither Allegiance nor
any of its subsidiaries has any material liability for life, health, medical or
other welfare benefits to former employees or beneficiaries or dependents
thereof which are not reflected in the financial statement included in the
Allegiance SEC Documents. To the knowledge of Allegiance, there has been no
communication to employees of Allegiance or its subsidiaries that could
reasonably be expected to promise or guarantee such employees retiree health or
life insurance benefits or other retiree death benefits on a permanent basis.

          (i) Except as disclosed in Section 4.15(i) to the Allegiance
Disclosure Schedule, neither the execution and delivery of this Agreement nor
the consummation of the transactions contemplated hereby will result in, cause
the accelerated vesting or delivery of, or increase the amount or value of, any
payment or benefit to any employee, officer, director or consultant of
Allegiance or any of its subsidiaries. Without limiting the generality of the

                                      -22-
<PAGE>

foregoing, except as set forth in Section 4.15(i) to the Allegiance Disclosure
Schedule, no amount paid or payable by Allegiance or any of its subsidiaries in
connection with the transactions contemplated hereby either solely as a result
thereof or as a result of such transactions in conjunction with any other events
will be an "excess parachute payment" within the meaning of Section 280G of the
Code.

          (j) Except as disclosed in Section 4.15(j) to the Allegiance
Disclosure Schedule, there are no pending or to the knowledge of Allegiance
threatened claims (other than claims for benefits in the ordinary course),
lawsuits or arbitrations which have been asserted or instituted against the
Plans, any fiduciaries thereof with respect to their duties to the Plans or the
assets of any of the trusts under any of the Plans that could reasonably be
expected to result in any material liability of Allegiance or any of its
subsidiaries to the Pension Benefit Guaranty Corporation, the Department of
Treasury, the Department of Labor or any Multiemployer Plan.

          (k) Allegiance has disclosed to Cardinal in writing the following
information for each executive officer of Allegiance and each other employee who
is a party to an agreement pursuant to the Allegiance Change in Control Plan (a
"Change in Control Agreement"): such individual's current cash compensation
(including, without limitation, salary and target annual bonus) and a
description or other documentation of such individual's material non-cash
compensation. Except as set forth in Section 4.15(k) to the Allegiance
Disclosure Schedule, no officer, director, or employee of Allegiance or any
other affiliate of Allegiance, or any immediate family member of any of the
foregoing, provides or causes to be provided to Allegiance any material assets,
services or facilities and Allegiance does not provide or cause to be provided
to any such officer, director, employee or affiliate, or any immediate family
member of any of the foregoing, any material assets, services or facilities.

          (l) All Plans subject to the laws of any jurisdiction outside of the
United States (i) have been maintained in accordance with all applicable
requirements, (ii) if they are intended to qualify for special tax treatment,
meet all requirements for such treatment, and (iii) if they are intended to be
funded and/or book-reserved, are actually fully funded and/or book reserved, as
appropriate, based upon reasonable actuarial assumptions.

          4.16 Contracts. Section 4.16 to the Allegiance Disclosure Schedule
lists as of the date hereof all written or oral contracts, agreements,
guarantees, leases and executory commitments other than Plans (each a
"Contract") to which Allegiance is a party and that fall within any of the
following categories: (a) joint venture, partnership and like agreements, other
than those that are, individually or in the aggregate, immaterial, (b) Contracts
containing covenants purporting to limit the freedom of Allegiance to compete in
any line of business in any geographic area or to hire any individual or group
of individuals, other than those that are, individually or in the aggregate,
immaterial (c) Contracts that after the Effective Time would have the effect of
limiting the freedom of Cardinal or its subsidiaries (other than Allegiance and
its subsidiaries) to compete in any line of business in any geographic area or
to hire any individual or group of individuals, (d) Contracts that contain
requirements or other terms that restrict or limit the purchasing relationships
of Allegiance or its affiliates, other than those that are, individually or in
the aggregate, immaterial, (e) Contracts with any labor organization or


                                      -23-
<PAGE>

union, (f) Contracts involving annual revenues to the business of Allegiance in
excess of 2.5% of Allegiance's annual revenues, (g) Contracts providing for
"earn-outs", "savings guarantees", "performance guarantees", or other contingent
payments by Allegiance involving more than $1,000,000 over the term of the
Contract, and (h) Contracts with or for the benefit of any affiliate of
Allegiance or immediate family member thereof (other than subsidiaries of
Allegiance) involving more than $60,000 in the aggregate per affiliate. All such
Contracts are valid and binding obligations of Allegiance and, to the knowledge
of Allegiance, the valid and binding obligation of each other party thereto
except such Contracts that if not so valid and binding would not, individually
or in the aggregate, have a Material Adverse Effect on Allegiance. Neither
Allegiance nor, to the knowledge of Allegiance, any other party thereto is in
violation of or in default in respect of, nor has there occurred an event or
condition that with the passage of time or giving of notice (or both) would
constitute a default under or permit the termination of, any such Contract
except such violations or defaults under or terminations that, individually or
in the aggregate, would not have a Material Adverse Effect on Allegiance. Set
forth in Section 4.16 to the Allegiance Disclosure Schedule is the amount of the
annual premium currently paid by Allegiance for its directors' and officers'
liability insurance.

          4.17 Labor Matters. Allegiance does not have any labor contracts or
collective bargaining agreements with any persons employed by Allegiance or any
persons otherwise performing services primarily for Allegiance. Except as set
forth in Section 4.17 to the Allegiance Disclosure Schedule, there is no labor
strike, dispute or stoppage pending or, to the knowledge of Allegiance,
threatened against Allegiance, and Allegiance has not experienced any labor
strike, dispute or stoppage or other material labor difficulty involving its
employees since October 1, 1996. Except as set forth in Section 4.17 to the
Allegiance Disclosure Schedule, to the knowledge of Allegiance, since October 1,
1996, no campaign or other attempt for recognition has been made by any labor
organization or employees with respect to employees of Allegiance or any of its
subsidiaries.

          4.18 Undisclosed Liabilities. Except (i) as and to the extent
disclosed or reserved against on the balance sheet of Allegiance as of December
31, 1997 included in the Allegiance SEC Documents, or (ii) as incurred after the
date thereof in the ordinary course of business consistent with prior practice
and not prohibited by this Agreement, Allegiance does not have any liabilities
or obligations of any nature, whether known or unknown, absolute, accrued,
contingent or otherwise and whether due or to become due, that, individually or
in the aggregate, have had or would reasonably be expected to have a Material
Adverse Effect on Allegiance.

          4.19 Permits; Compliance.

          (a) Allegiance is in possession of all material franchises, grants,
authorizations, licenses, permits, easements, variances, exemptions, consents,
certificates, approvals and orders necessary to own, lease and operate its
properties and to carry on its business as it is now being conducted
(collectively, the "Allegiance Permits"), and there is no Action pending or, to
the knowledge of Allegiance, threatened regarding any of the Allegiance Permits.
Allegiance is not in conflict with, or in default or violation of any of the
Allegiance Permits, except for any such 


                                      -24-
<PAGE>

conflicts, defaults or violations which, individually or in the aggregate, could
not reasonably be expected to have a Material Adverse Effect on Allegiance.

          (b) Except as would not, individually or in the aggregate, reasonably
be expected to have a Material Adverse Effect on Allegiance:

          (i) all necessary clearances or approvals from Governmental
     Authorities for all drug and device products which are manufactured and/or
     sold by Allegiance and its subsidiaries have, to the knowledge of
     Allegiance, been obtained, and Allegiance and its subsidiaries are in
     substantial compliance with the most current form of each applicable
     clearance or approval with respect to the manufacture, storage,
     distribution, promotion and sale by Allegiance and its subsidiaries of such
     products;

          (ii) none of Allegiance, or any of its officers, employees or agents
     (during the term of such person's employment by Allegiance or while acting
     as an agent of Allegiance, or, to Allegiance's actual knowledge, prior to
     such employment) has made any untrue statement of a material fact or
     fraudulent statement to the Food & Drug Administration, (the "FDA") or any
     similar Governmental Authorities, failed to disclose a material fact
     required to be disclosed to the FDA or similar Governmental Authorities, or
     committed an act, made a statement or failed to make a statement that could
     reasonably be expected to provide a basis for the FDA or similar
     Governmental Authorities to invoke its policy respecting "Fraud, Untrue
     Statements of Material Facts, Bribery, and Illegal Gratuities" or similar
     governmental policy, rule, regulation or law;

          (iii) as to each article of drug, device, cosmetic or vitamin
     manufactured (directly or indirectly) and/or, to the knowledge of
     Allegiance, distributed by Allegiance, such article is not adulterated or
     misbranded within the meaning of the Food, Drug and Cosmetic Act or any
     similar governmental act or law of any jurisdiction; and

          (iv) none of Allegiance or any of its officers, employees or agents
     (during the term of such person's employment by Allegiance or while acting
     as an agent of Allegiance, or, to Allegiance's knowledge, prior to such
     employment), subsidiaries or affiliates has been convicted of any crime or
     engaged in any conduct for which debarment or similar punishment is
     mandated or permitted by any Applicable Law.

          4.20 Environmental Matters. Except as disclosed in the Allegiance SEC
Documents, (i) the properties, operations and activities of Allegiance and its
subsidiaries are in compliance with all applicable Environmental Laws (as
defined below) and all past noncompliance of Allegiance or any Allegiance
subsidiary with any Environmental Laws or Environmental Permits (as defined
below), has been resolved without any pending, ongoing or future obligation,
cost or liability; (ii) Allegiance and its subsidiaries and the properties and
operations of Allegiance and its subsidiaries are not subject to any existing,
pending or, to the knowledge of Allegiance, threatened Action by or before any
court or Governmental Authority under any Environmental Law; (iii) there has
been no release of any hazardous substance,


                                      -25-
<PAGE>

pollutant or contaminant into the environment by Allegiance or its subsidiaries
or in connection with their properties or operations; and (iv) there has been no
exposure of any person or property to any hazardous substance, pollutant or
contaminant in connection with the properties, operations and activities of
Allegiance and its subsidiaries, in each case, other than those matters that,
individually or in the aggregate, would not reasonably be expected to have a
Material Adverse Effect on Allegiance. The term "Environmental Laws" means all
federal, state, local or foreign laws relating to pollution, or protection of
human health from Hazardous Materials (as defined below) or the environment
(including, without limitation, ambient air, surface water, groundwater, land
surface or subsurface strata), including, without limitation, laws relating to
emissions, discharges, releases or threatened releases of chemicals, pollutants,
contaminants, or industrial, toxic or hazardous substances or wastes
(collectively, "Hazardous Materials") into the environment, or otherwise
relating to the manufacture, processing, distribution, use, treatment, storage,
disposal, transport or handling of Hazardous Materials, as well as all
authorizations, codes, decrees, injunctions, judgments, licenses, notices,
orders, permits, plans or regulations issued, entered, promulgated or approved
thereunder. "Environmental Permit" means any permit, approval, license or other
authorization required under or issued pursuant to any applicable Environmental
Law.

          4.21 Opinion of Financial Advisor. Allegiance has received the written
opinion of CSFB, its financial advisor, to the effect that, as of the date of
this Agreement, the Exchange Ratio is fair to the Allegiance Stockholders from a
financial point of view. Allegiance has heretofore provided copies of such
opinion to Cardinal and such opinion has not been withdrawn or revoked or
modified in any material respect.

          4.22 Board Recommendation; Required Vote. The Board of Directors of
Allegiance, at a meeting duly called and held, has by unanimous vote of those
directors present (who constituted 100% of the directors then in office) (i)
determined that this Agreement and the transactions contemplated hereby,
including the Merger, and the Allegiance Stock Option Agreement and the
transactions contemplated thereby, taken together, are fair to and in the best
interests of the Allegiance Stockholders, and (ii) resolved to recommend that
the holders of the shares of Allegiance Common Stock approve this Agreement and
the transactions contemplated herein, including the Merger (the "Allegiance
Board Recommendation"). The affirmative vote of holders of a majority of the
outstanding shares of Allegiance Common Stock to approve the Merger is the only
vote of the holders of any class or series of Allegiance Common Stock necessary
to adopt the Agreement and approve the transactions contemplated hereby.

          4.23 Section 203 of DGCL; Rights Agreement. Prior to the date hereof,
the Board of Directors of Allegiance has taken all action necessary to exempt
under or make not subject to (x) the provisions of Section 203 of the DGCL and
(y) any other state takeover law or state law that purports to limit or restrict
business combinations or the ability to acquire or vote shares: (i) the
execution of this Agreement, the Allegiance Stock Option Agreement and the
Support/Voting Agreements dated as of October 8, 1998 between Cardinal and
certain Allegiance Stockholders (collectively, the "Support Agreements"), (ii)
the Merger and (iii) the transactions contemplated hereby and by the Allegiance
Stock Option Agreement and the Support Agreements. The Rights Agreement, dated
as of September 30, 1996 (the "Allegiance


                                      -26-
<PAGE>

Rights Agreement"), between Allegiance and First Chicago Trust Company of New
York, a New York banking corporation, has been amended so that Cardinal and
Subcorp are each exempt from the definition of "Acquiring Person" contained in
the Allegiance Rights Agreement, no "Stock Acquisition Date" or "Distribution
Date" or "Triggering Event" (as such terms are defined in the Allegiance Rights
Agreement) will occur as a result of the execution of this Agreement or the
Allegiance Stock Option Agreement or the consummation of the Merger pursuant to
this Agreement or the acquisition or transfer of shares of Allegiance Common
Stock by Cardinal pursuant to the Allegiance Stock Option Agreement and the
Allegiance Rights Agreement will expire immediately prior to the Effective Time,
and the Allegiance Rights Agreement, as so amended, has not been further amended
or modified. Copies of all such amendments to the Allegiance Rights Agreement
have been previously provided to Cardinal.

          4.24 Employee Agreements. Each of the two employees of Allegiance
specified in Section 4.24 to the Allegiance Disclosure Schedule has duly
executed and delivered an amendment to such employee's Change in Control
Agreement with Allegiance, and such amendments have not been further amended or
terminated. Allegiance has previously provided to Cardinal copies of all such
amendments.


                                   ARTICLE V.

                            COVENANTS OF THE PARTIES

                  The parties hereto agree that:

          5.1 Mutual Covenants.

          (a) HSR Act Filings; Reasonable Best Efforts; Notification.

          (i) Each of Cardinal and Allegiance shall (A) make or cause to be made
     the filings required of such party or any of its subsidiaries or affiliates
     under the HSR Act with respect to the transactions contemplated hereby as
     promptly as practicable and in any event within fifteen business days after
     the date of this Agreement, (B) comply at the earliest practicable date
     with any request under the HSR Act for additional information, documents,
     or other materials received by such party or any of its subsidiaries from
     the Federal Trade Commission or the Department of Justice or any other
     Governmental Authority in respect of such filings or such transactions, and
     (C) cooperate with the other party in connection with any such filing
     (including, with respect to the party making a filing, providing copies of
     all such documents to the non-filing party and its advisors prior to filing
     (other than documents containing confidential business information that
     shall be shared only with outside counsel to the non-filing party) and, if
     requested, to accept all reasonable additions, deletions or changes
     suggested in connection therewith) and in connection with resolving any
     investigation or other inquiry of any such agency or other Governmental
     Authority under any Antitrust Laws (as defined in Section 5.1(a)(ii)) with
     respect to any such filing or any such transaction. Each party shall use
     its reasonable best efforts to 


                                      -27-
<PAGE>

     furnish to each other all information required for any application or other
     filing to be made pursuant to any Applicable Law in connection with the
     Merger and the other transactions contemplated by this Agreement. Each
     party shall promptly inform the other party of any communication with, and
     any proposed understanding, undertaking, or agreement with, any
     Governmental Authority regarding any such filings or any such transaction.
     Neither party shall independently participate in any meeting with any
     Governmental Authority in respect of any such filings, investigation, or
     other inquiry without giving the other party prior notice of the meeting
     and, to the extent permitted by such Governmental Authority, the
     opportunity to attend and/or participate. The parties hereto will consult
     and cooperate with one another, in connection with any analyses,
     appearances, presentations, memoranda, briefs, arguments, opinions and
     proposals made or submitted by or on behalf of any party hereto in
     connection with proceedings under or relating to the HSR Act or other
     Antitrust Laws.

          (ii) Each of Cardinal and Allegiance shall use its reasonable best
     efforts to resolve such objections, if any, as may be asserted by any
     Governmental Authority with respect to the transaction contemplated by this
     Agreement under the HSR Act, the Sherman Act, as amended, the Clayton Act,
     as amended, the Federal Trade Commission Act, as amended, and any other
     federal, state or foreign statues, rules, regulations, orders, decrees,
     administrative or judicial doctrines or other laws that are designed to
     prohibit, restrict or regulate actions having the purpose or effect of
     monopolization or restraint of trade (collectively, "Antitrust Laws"). In
     connection therewith, if any administrative or judicial action or
     proceeding is instituted (or threatened to be instituted) challenging any
     transaction contemplated by this Agreement as violative of any Antitrust
     Law, each of Cardinal and Allegiance shall cooperate and use its reasonable
     best efforts vigorously to contest and resist any such action or
     proceeding, including any legislative, administrative or judicial action,
     and to have vacated, lifted, reversed, or overturned any decree, judgment,
     injunction or other order whether temporary, preliminary or permanent (each
     an "Order"), that is in effect and that prohibits, prevents, or restricts
     consummation of the Merger or any other transactions contemplated by this
     Agreement, including, without limitation, by vigorously pursuing all
     available avenues of administrative and judicial appeal and all available
     legislative action, unless by mutual agreement Cardinal and Allegiance
     decide that litigation is not in their respective best interests.
     Notwithstanding the foregoing or any other provision of this Agreement,
     nothing in this Section 5.1(a) shall limit a party's right to terminate
     this Agreement pursuant to Section 7.1, so long as such party has up to
     then complied in all material respects with its obligations under this
     Section 5.1(a). Each of Cardinal and Allegiance shall use all reasonable
     efforts to take such action as may be required to cause the expiration of
     the notice periods under the HSR Act or other Antitrust Laws with respect
     to such transactions as promptly as possible after the execution of this
     Agreement.

          (iii) Each of the parties agrees to use its reasonable best efforts to
     take, or cause to be taken, all actions, and to do, or cause to be done,
     and to assist and 


                                      -28-
<PAGE>

     cooperate with the other parties in doing, all things necessary, proper or
     advisable to consummate and make effective, in the most expeditious manner
     practicable, the Merger and the other transactions contemplated by this
     Agreement, including (A) the obtaining of all other necessary actions or
     nonactions, waivers, consents, licenses, permits, authorizations, orders
     and approvals from Governmental Authorities and the making of all other
     necessary registrations and filings (including other filings with
     Governmental Authorities, if any), (B) the obtaining of all consents,
     approvals or waivers from third parties related to or required in
     connection with the Merger that are necessary to consummate the Merger and
     the transactions contemplated by this Agreement or required to prevent a
     Material Adverse Effect on Cardinal or Allegiance from occurring prior to
     or after the Effective Time, (C) the preparation of the Joint Proxy
     Statement, the Prospectus and the Registration Statement, (D) the taking
     all action necessary to ensure that it is a "poolable entity" eligible to
     participate in a transaction to be accounted for as a pooling-of-interests
     for financial reporting purposes, and (E) the execution and delivery of any
     additional instruments necessary to consummate the transaction contemplated
     by, and to fully carry out the purposes of, this Agreement.

          (iv) Notwithstanding anything to the contrary in this Agreement, (A)
     neither Cardinal nor any of its subsidiaries shall be required to hold
     separate (including by trust or otherwise) or to divest any of their
     respective businesses or assets, or to take or agree to take any action or
     agree to any limitation that could reasonably be expected to have a
     Material Adverse Effect on Cardinal and its subsidiaries taken as a whole
     or a material adverse effect on the assets, liabilities, results of
     operations or financial condition of Cardinal combined with the Surviving
     Corporation after the Effective Time, (B) prior to the Effective Time,
     neither Allegiance nor its subsidiaries shall be required to hold separate
     (including by trust or otherwise) or to divest any of their respective
     businesses or assets, or to take or agree to take any other action or agree
     to any limitation that could reasonably be expected to have a Material
     Adverse Effect on Allegiance and its subsidiaries taken as a whole, (C)
     neither party nor their respective subsidiaries shall be required to take
     any action that would reasonably be expected to substantially impair the
     overall benefits expected, as of the date hereof, to be realized from
     consummation of the Merger and (D) neither party shall be required to waive
     any of the conditions to the Merger set forth in Article VI as they apply
     to such party.

          (b) Pooling-of-Interests. Each of the parties agrees that it shall
not, and shall not permit any of its subsidiaries to, take any actions
(regardless of whether such action would otherwise be permitted or not
prohibited hereunder) that would, or would be reasonably likely to, prevent
Cardinal from accounting, and shall use its reasonable best efforts (including,
without limitation, providing appropriate representation letters to Cardinal's
accountants) to allow Cardinal to account, for the Merger in accordance with the
pooling-of-interests method of accounting under the requirements of Opinion No.
16 "Business Combinations" of the Accounting Principles Board of the American
Institute of Certified Public Accountants, as amended by applicable
pronouncements by the Financial Accounting Standards Board, and all 


                                      -29-
<PAGE>

related published rules, regulations and policies of the Commission ("APB No.
16"), and to obtain a letter, in form and substance reasonably satisfactory to
Cardinal, from Deloitte & Touche LLP dated the Closing Date stating that they
concur with management's conclusion that the Merger will qualify as a
transaction to be accounted for by Cardinal in accordance with the
pooling-of-interests method of accounting under the requirements of APB No. 16.

          (c) Tax-Free Treatment. Each of the parties shall use its reasonable
best efforts to cause the Merger to constitute a tax-free "reorganization" under
Section 368(a) of the Code and to cooperate with one another in obtaining an
opinion from Davis Polk & Wardwell, counsel to Allegiance, as provided for in
Section 6.2(d). In connection therewith, each of Cardinal and Allegiance shall
deliver to Davis Polk & Wardwell representation letters and Allegiance shall use
all reasonable efforts to obtain representation letters from appropriate
shareholders of Allegiance and shall deliver any such letters obtained to Davis
Polk & Wardwell, in each case, in form and substance reasonably satisfactory to
Davis Polk & Wardwell.

          (d) Public Announcements. The initial press release concerning the
Merger and the transactions contemplated hereby shall be a joint press release.
Unless otherwise required by Applicable Laws or requirements of the NYSE (and,
in that event, only if time does not permit), at all times prior to the earlier
of the Effective Time or termination of this Agreement pursuant to Section 7.1,
Cardinal and Allegiance shall consult with each other before issuing any press
release with respect to the Merger and shall not issue any such press release
prior to such consultation.

          5.2 Covenants of Cardinal.

          (a) Cardinal Shareholders Meeting. Cardinal shall take all action in
accordance with the federal securities laws, the Ohio Revised Code, the Cardinal
Articles and the Cardinal Code of Regulations, necessary to duly call, give
notice of, convene and hold a special meeting of Cardinal Shareholders (the
"Cardinal Shareholders Meeting") to be held on the earliest practical date
determined in consultation with Allegiance, and to obtain the consent and
approval of Cardinal Shareholders with respect to the Share Issuance and the
transactions contemplated hereby. Cardinal shall take all lawful action to
solicit the approval of the Share Issuance by the Cardinal Shareholders and the
Board of Directors of Cardinal shall recommend approval of the Share Issuance by
the Cardinal Shareholders.

          (b) Preparation of Registration Statement. Cardinal shall, as soon as
is reasonably practicable, prepare the Joint Proxy Statement for filing with the
Commission on a confidential basis (unless Cardinal shall reasonably determine,
in consultation with Allegiance, that it is appropriate to file the Joint Proxy
Statement with the Commission on a non-confidential basis as the Registration
Statement) and shall file the Joint Proxy Statement. Consistent with the timing
for the Cardinal Shareholders Meeting and the Allegiance Stockholders Meeting as
determined by Cardinal after consultation with Allegiance, Cardinal shall
prepare and file the Registration Statement with the Commission as soon as is
reasonably practicable following clearance of the Joint Proxy Statement by the
Commission and shall use its reasonable best efforts to have the Registration
Statement declared effective by the Commission as promptly as 


                                      -30-
<PAGE>

practicable and to maintain the effectiveness of the Registration Statement
through the Effective Time. If, at any time prior to the Effective Time,
Cardinal shall obtain knowledge of any information pertaining to Cardinal
contained in or omitted from the Registration Statement that would require an
amendment or supplement to the Registration Statement or the Joint Proxy
Statement, Cardinal will so advise Allegiance in writing and will promptly take
such action as shall be required to amend or supplement the Registration
Statement and/or the Joint Proxy Statement. Cardinal shall promptly furnish to
Allegiance all information concerning it as may be required for supplementing
the Joint Proxy Statement. Cardinal shall cooperate with Allegiance in the
preparation of the Joint Proxy Statement in a timely fashion and shall use its
reasonable best efforts to assist Allegiance in clearing the Joint Proxy
Statement with the Staff of the Commission. Consistent with the timing of the
Cardinal Shareholders Meeting and the Allegiance Stockholder Meeting, Cardinal
shall use all reasonable best efforts to mail at the earliest practicable date
to Cardinal Shareholders the Joint Proxy Statement, which Joint Proxy Statement
shall include all information required under Applicable Law to be furnished to
Cardinal Shareholders in connection with the Share Issuance and shall include
the recommendation of the Cardinal Board of Directors that the Cardinal
Shareholders approve the Share Issuance. Cardinal shall also take such other
reasonable actions (other than qualifying to do business in any jurisdiction in
which it is not so qualified) required to be taken under any applicable state
securities laws in connection with the issuance of Cardinal Common Shares in the
Merger. No filing of, or amendment or supplement to, the Registration Statement
or to the Joint Proxy Statement will be made by Cardinal without providing
Allegiance the opportunity to review and comment thereon. Cardinal will advise
Allegiance, promptly after it receives notice thereof, of the time when the
Registration Statement has become effective or any supplement or amendment has
been filed, the issuance of any stop order, the suspension of the qualification
of Cardinal Common Stock issuable in connection with the Merger for offering or
sale in any jurisdiction, or any request by the Commission for amendment of the
Joint Proxy Statement or the Registration Statement or comments thereon and
responses thereto or requests by the Commission for additional information.
Cardinal will hold the Cardinal Shareholders Meeting no later than the date of
the Allegiance Stockholder Meeting and as soon as practicable after the date
hereof

          (c) Conduct of Cardinal's Operations. During the period from the date
of this Agreement to the Effective Time, Cardinal shall use its reasonable best
efforts to maintain and preserve its business organization and to retain the
services of its officers and key employees and maintain relationships with
customers, suppliers and other third parties to the end that their goodwill and
ongoing business shall not be impaired in any material respect. During the
period from the date of this Agreement to the Effective Time, Cardinal shall not
(i) make any amendment to the Cardinal Articles that changes the fundamental
attributes of the Cardinal Common Stock, (ii) make any material changes to the
Certificate of Incorporation of Subcorp, (iii) make, declare or pay any
extraordinary cash dividend, other than extraordinary dividends between Cardinal
and a subsidiary of Cardinal and non-extraordinary dividends, (iv) permit or
cause any subsidiaries to do any of the foregoing or agree or commit to any of
the foregoing, or (v) agree in writing or otherwise to take any of the foregoing
actions.

                                      -31-
<PAGE>

          (d) Indemnification; Directors' and Officers' Insurance.

          (i) From and after the Effective Time, Cardinal shall cause, the
     Surviving Corporation to indemnify and hold harmless the present and former
     officers and directors of Allegiance in respect of acts or omissions
     occurring prior to the Effective Time to the extent provided under the
     Allegiance Certificate or the Allegiance Bylaws, and

          (ii) Cardinal shall use all reasonable efforts to cause the Surviving
     Corporation or Cardinal to obtain and maintain in effect for a period of
     six years after the Effective Time policies of directors' and officers'
     liability insurance at no cost to the beneficiaries thereof with respect to
     acts or omissions occurring prior to the Effective Time with substantially
     the same coverage and containing substantially similar terms and conditions
     as existing policies; provided, however, that neither the Surviving
     Corporation nor Cardinal shall be required to pay an aggregate premium for
     such insurance coverage in excess of 150% of the amount set forth in
     Section 4.16 to the Allegiance Disclosure Schedule.

          (e) Merger Sub. Prior to the Effective Time, Subcorp shall not conduct
any business or make any investments other than as specifically contemplated by
this Agreement and will not have any assets (other than a de minimis amount of
cash paid to Subcorp for the issuance of its stock to Cardinal) or any material
liabilities. Cardinal will take all action necessary to cause Subcorp to perform
its obligations under this Agreement and to consummate the Merger on the terms
and conditions set forth in this Agreement.

          (f) NYSE Listing. Cardinal shall use its reasonable efforts to cause
the Cardinal Common Shares issuable pursuant to the Merger (including pursuant
to Cardinal Exchange Options) to be approved for listing on the NYSE, subject to
official notice of issuance, prior to the Effective Time.

          (g) Access. Cardinal shall permit representatives of Allegiance to
have appropriate access at all reasonable times to Cardinal's premises,
properties, books, records, contracts, documents, customers and suppliers.
Information obtained by Allegiance pursuant to this Section 5.2 shall be subject
to the provisions of the confidentiality agreement between Cardinal and
Allegiance dated October 1, 1998 (the "Confidentiality Agreement"), which
agreement remains in full force and effect. No investigation conducted pursuant
to this Section 5.2 shall affect or be deemed to modify any representation or
warranty made in this Agreement.

          (h) Board of Directors of Cardinal. The Board of Directors of Cardinal
shall take all action necessary immediately following the Effective Time to
elect as directors of Cardinal Mr. Lester Knight, and two other independent
directors who are currently members of the Board of Directors of Allegiance
chosen by the Chairman of Cardinal from three directors of Allegiance proposed
by the Board of Directors of Allegiance prior to the Effective Time, for a term
expiring at Cardinal's next annual meeting of shareholders following the
Effective Time at which the term of the class to which such director is elected
expires, subject to being renominated as a director of Cardinal at the
discretion of Cardinal's Board of Directors, 


                                      -32-
<PAGE>

provided, however, that not more than one of such directors will be in the class
whose term expires at Cardinal's 1999 annual meeting of shareholders.

          (i) Employees and Employee Benefits.

               (A) From and after the Effective Time, Cardinal shall treat all
     service by Allegiance Employees (as defined below) with Allegiance and
     their respective predecessors prior to the Effective Time for all purposes
     as service with Cardinal (except for purposes of benefit accrual under
     defined benefit pension plans or to the extent such treatment would result
     in duplicative accrual on or after the Closing Date of benefits for the
     same period of service), and, with respect to any medical or dental benefit
     plan in which Allegiance Employees participate after the Effective Time,
     Cardinal shall waive or cause to be waived any pre-existing condition
     exclusions and actively-at-work requirements (provided, however, that no
     such waiver shall apply to a pre-existing condition of any Allegiance
     Employee who was, as of the Effective Time, excluded from participation in
     an Allegiance Plan by virtue of such pre-existing condition), and shall
     provide that any covered expenses incurred on or before the Effective Time
     during the plan year of the applicable Allegiance Plan in which the
     Effective Time occurs by an Allegiance Employee or an Allegiance Employee's
     covered dependent shall be taken into account for purposes of satisfying
     applicable deductible, coinsurance and maximum out-of-pocket provisions
     after the Effective Time to the same extent as such expenses are taken into
     account for the benefit of similarly situated employees of Cardinal and
     subsidiaries of Cardinal. For purposes of this Section 5.2(i), "Allegiance
     Employees" shall mean persons who are, as of the Effective Time, employees
     of Allegiance.

               (B) For a period of one year following the Effective Time,
     Cardinal agrees that it will, or will cause the Surviving Corporation and
     each subsidiary of the Surviving Corporation to, continue to maintain for
     the benefit of individuals who are employees of Allegiance and its
     subsidiaries who continue to be employed following the Effective Time
     ("Continuing Allegiance Employees") compensation and benefit plans,
     programs, arrangements and policies which provide compensation and benefits
     that are substantially comparable, in the aggregate, to those provided by
     Allegiance or any subsidiary of Allegiance, if applicable, for the benefit
     of such Continuing Allegiance Employees immediately prior to the Effective
     Time; provided that termination or amendment of the ESPP shall not be
     deemed to violate this sentence.

               (C) If any individual who is employed by Allegiance or any
     subsidiary of Allegiance immediately prior to the Effective Time is
     terminated by Cardinal at the Effective Time or during the one-year period
     following the Effective Time, Cardinal shall pay to such individual
     severance pay, and ensure benefit continuation, including coverage by any
     relevant group medical or life insurance benefits, on a basis no less
     favorable to such individual than under the severance policies of
     Allegiance in existence immediately prior to the Effective Time, based on
     the salary of such individual in effect on his or her termination date,
     with appropriate credit for accumulated service with Allegiance, its
     Affiliates and Cardinal, and during any period of salary continuation.

                                      -33-
<PAGE>

               (D) Cardinal agrees to, or to cause the Surviving Corporation to
     continue to, provide the transition benefit specified under subsection 4.3
     of the Allegiance Retirement Plan to all eligible Allegiance Employees in
     the same amounts, at the same times and pursuant to the same terms and
     conditions as specified in the Allegiance Retirement Plan prior to the
     Effective Time.

          (j) Restrictions on Termination of Employees. Cardinal shall not
terminate any Allegiance Employee who is prohibited from selling Cardinal Common
Shares or shares of Allegiance Common Stock pursuant to the restrictions in
connection with the pooling-of-interests method of accounting under APB No. 16
or any other restrictions under federal or state securities laws during the time
period such employee is prohibited from selling such shares pursuant to such
restrictions; provided, that the foregoing shall not prevent Cardinal from
terminating any such Allegiance Employee (i) for cause, as determined by
Cardinal in good faith or (ii) at any time after the expiration of six months
after the Effective Time; and provided, further, that there shall not be taken
into account for purposes of the foregoing any restrictions under federal or
state securities laws that arise as a result of actions of the Allegiance
employee in question after the Effective Time.

          (k) SIP. If no waiver as described in the next sentence is obtained,
Cardinal shall assume the obligations of Allegiance under the Facility and
Guaranty Agreement (the "Facility Agreement") dated as of May 2, 1997 by and
between Allegiance, the Lenders thereunder and The First National Bank of
Chicago ("First National"), individually and as Agent for the Lenders
thereunder. Cardinal shall cooperate and use its best efforts to cause First
National to waive the provisions for early repayment upon the occurrence of a
Change of Control set forth in Section 2(a) of the Form of Master Promissory
Note under the Facility Agreement.

          5.3 Covenants of Allegiance.

          (a) Allegiance Stockholders Meeting. Allegiance shall take all action
in accordance with the federal securities laws, the DGCL and the Allegiance
Certificate and the Allegiance Bylaws necessary to duly call, give notice of,
convene and hold a special meeting of Allegiance Stockholders (the "Allegiance
Stockholders Meeting") to be held on the earliest practicable date determined in
consultation with Cardinal to consider and vote upon approval of the Merger,
this Agreement and the transactions contemplated hereby. Allegiance shall take
all lawful actions to solicit the approval of the Merger, this Agreement and the
transactions contemplated hereby, by the Allegiance Stockholders, and the Board
of Directors of Allegiance shall recommend approval of the Merger, this
Agreement and the transactions contemplated hereby by the Allegiance
Stockholders (to the extent not previously withdrawn pursuant to Section
5.3(d)).

          (b) Information for the Registration Statement and Preparation of
Joint Proxy Statement. Allegiance shall promptly furnish Cardinal with all
information concerning it as may be required for inclusion in the Joint Proxy
Statement and the Registration Statement. Allegiance shall cooperate with
Cardinal in the preparation of the Joint Proxy Statement and the Registration
Statement in a timely fashion and shall use all reasonable efforts to assist
Cardinal 


                                      -34-
<PAGE>

in having the Registration Statement declared effective by the Commission as
promptly as practicable consistent with the timing for the Cardinal Shareholders
Meeting and the Allegiance Stockholders Meeting as determined by Cardinal after
consultation with Allegiance. If, at any time prior to the Effective Time,
Allegiance obtains knowledge of any information pertaining to Allegiance that
would require any amendment or supplement to the Registration Statement or the
Joint Proxy Statement, Allegiance shall so advise Cardinal and shall promptly
furnish Cardinal with all information as shall be required for such amendment or
supplement and shall promptly amend or supplement the Registration Statement
and/or Joint Proxy Statement. Allegiance shall use all reasonable efforts to
cooperate with Cardinal in the preparation and filing of the Joint Proxy
Statement with the Commission on a confidential basis (except to the extent
determined pursuant to the terms of Section 5.2(b)). Consistent with the timing
for the Cardinal Shareholders Meeting and the Allegiance Stockholders Meeting as
determined by Cardinal after consultation with Allegiance, Allegiance shall use
all reasonable efforts to mail at the earliest practicable date to Allegiance
Stockholders the Joint Proxy Statement, which shall include all information
required under Applicable Law to be furnished to Allegiance Stockholders in
connection with the Merger and the transactions contemplated thereby and shall
include the Allegiance Board Recommendation to the extent not previously
withdrawn in compliance with Section 5.3(d) and the written opinion of CSFB
described in Section 4.21.

          (c) Conduct of Allegiance's Operations. Allegiance shall conduct its
operations in the ordinary course except as expressly contemplated by this
Agreement and the transactions contemplated hereby and shall use its reasonable
best efforts to maintain and preserve its business organization and its material
rights and franchises and to retain the services of its officers and key
employees and maintain relationships with customers, suppliers, lessees,
licensees and other third parties, and to maintain all of its operating assets
in their current condition (normal wear and tear excepted), to the end that
their goodwill and ongoing business shall not be impaired in any material
respect. Without limiting the generality of the foregoing, during the period
from the date of this Agreement to the Effective Time, Allegiance shall not,
except as otherwise expressly contemplated by this Agreement and the
transactions contemplated hereby or as set forth in Section 5.3(c) to the
Allegiance Disclosure Schedule, without the prior written consent of Cardinal:

               (i) do or effect any of the following actions with respect to its
          securities: (A) adjust, split, combine or reclassify its capital
          stock, (B) make, declare or pay any dividend (other than regular
          quarterly dividends on Allegiance Common Stock of $0.0525 per share
          with record and payment dates consistent with past practice) or
          distribution on, or, directly or indirectly, redeem, purchase or
          otherwise acquire, any shares of its capital stock or any securities
          or obligations convertible into or exchangeable for any shares of its
          capital stock, (C) grant any person any right or option to acquire any
          shares of its capital stock, (D) issue, deliver or sell or agree to
          issue, deliver or sell any additional shares of its capital stock or
          any securities or obligations convertible into or exchangeable or
          exercisable for any shares of its capital stock or such securities
          (except pursuant to the exercise of Allegiance Options that are
          outstanding as of the date hereof or the exercise of ESPP Rights), or
          (E) enter 


                                      -35-
<PAGE>

     into any agreement, understanding or arrangement with respect to the sale,
     voting, registration or repurchase of its capital stock;

               (ii) directly or indirectly sell, transfer, lease, pledge,
          mortgage, encumber or otherwise dispose of any of its property or
          assets other than in the ordinary course of business;

               (iii) make or propose any changes in the Allegiance Certificate
          or the Allegiance Bylaws;

               (iv) merge or consolidate with any other person;

               (v) acquire a material amount of assets or capital stock of any
          other person;

               (vi) amend or modify, or propose to amend or modify, the
          Allegiance Rights Agreement, as amended as of the date hereof;

               (vii) incur, create, assume or otherwise become liable for any
          indebtedness for borrowed money or assume, guarantee, endorse or
          otherwise as an accommodation become responsible or liable for the
          obligations of any other individual, corporation or other entity,
          other than in the ordinary course of business, consistent with past
          practice;

               (viii) create any subsidiaries;

               (ix) enter into or modify any employment, severance, termination
          or similar agreements or arrangements with, or grant any bonuses,
          salary increases, severance or termination pay to, any officer,
          director, consultant or employee other than in the ordinary course of
          business consistent with past practice (except for change-of-control
          severance agreements that in all cases shall require the prior written
          consent of Cardinal), or otherwise increase the compensation or
          benefits provided to any officer, director, consultant or employee
          except as may be required by Applicable Law or in the ordinary course
          of business consistent with past practice, or grant, reprice, or
          accelerate the exercise or payment of any Allegiance Options or other
          equity-based awards;

               (x) enter into, adopt or amend any employee benefit or similar
          plan, except as may be required by Applicable Law;

               (xi) take any action that could give rise to a right to severance
          benefits pursuant to any Change in Control Agreement;

               (xii) change any method or principle of accounting in a manner
          that is inconsistent with past practice except to the extent required
          by United States generally accepted accounting principles as advised
          by Allegiance's regular independent accountants;

                                      -36-
<PAGE>

               (xiii) settle any Actions, whether now pending or hereafter made
          or brought involving, individually or in the aggregate, an amount in
          excess of $1,000,000;

               (xiv) modify, amend or terminate, or waive, release or assign any
          material rights or claims with respect to any confidentiality
          agreement to which Allegiance is a party;

               (xv) enter into any confidentiality agreements or arrangements
          other than in the ordinary course of business consistent with past
          practice (other than as permitted, in each case, by Section 5.3(d));

               (xvi) write up, write down or write off the book value of any
          assets, individually or in the aggregate, in excess of $1 million
          except for depreciation and amortization in accordance with generally
          accepted accounting principles consistently applied;

               (xvii) incur or commit to any capital expenditures other than
          pursuant to the Allegiance Corporation Operating Plan as in effect on
          the date of this Agreement, provided that no individual capital
          expenditure will be in excess of $5 million;

               (xviii) make any payments in respect of policies of directors'
          and officers' liability insurance (premiums or otherwise) other than
          premiums paid in respect of its current policies not in excess of the
          amount paid prior to the date of this Agreement;

               (xix) take any action to exempt or make not subject to (x) the
          provisions of Section 203 of the DGCL or (y) any other state takeover
          law or state law that purports to limit or restrict business
          combinations or the ability to acquire or vote shares, any person or
          entity (other than Cardinal or its subsidiaries) or any action taken
          thereby, which person, entity or action would have otherwise been
          subject to the restrictive provisions thereof and not exempt
          therefrom;

               (xx) take any action that would likely result in the
          representations and warranties set forth in Article IV becoming false
          or inaccurate in any material respect;

               (xxi) enter into or carry out any other transaction other than in
          the ordinary and usual course of business;

               (xxii) permit or cause any subsidiary to do any of the foregoing
          or agree or commit to do any of the foregoing; or

               (xxiii) agree in writing or otherwise to take any of the
          foregoing actions.

          (d) No Solicitation. Allegiance agrees that, during the term of this
Agreement, it shall not, and shall not authorize or permit any of its
subsidiaries or any of its or its subsidiaries' directors, officers, employees,
agents or representatives, directly or indirectly, to 


                                      -37-
<PAGE>

solicit, initiate, encourage or knowingly facilitate, or furnish or disclose
non-public information in furtherance of, any inquiries or the making of any
proposal with respect to any recapitalization, merger, consolidation or other
business combination involving Allegiance, or acquisition of any capital stock
(other than upon exercise of Allegiance Options that are outstanding as of the
date hereof) or 15% or more of the assets of Allegiance and its subsidiaries,
taken as a whole, in a single transaction or a series of related transactions,
or any combination of the foregoing (a "Competing Transaction"), or negotiate,
explore or otherwise engage in discussions with any person (other than Cardinal,
Subcorp or their respective directors, officers, employees, agents and
representatives) with respect to any Competing Transaction or enter into any
agreement, arrangement or understanding requiring it to abandon, terminate or
fail to consummate the Merger or any other transactions contemplated by this
Agreement; provided that, at any time prior to the approval of the Merger by the
Allegiance Stockholders, Allegiance may furnish information to, and negotiate or
otherwise engage in discussions with, any party who delivers a written proposal
for a Competing Transaction which was not solicited or encouraged after the date
of this Agreement if and so long as the Board of Directors of Allegiance
determines in good faith by resolution duly adopted after consultation with its
outside counsel (who may be its regularly engaged outside counsel) that the
failure to take such action would reasonably be expected to constitute a breach
of its fiduciary duties under Applicable Law and determines that such a proposal
is, after consulting with CSFB (or any other nationally recognized investment
banking firm), more favorable to Allegiance Stockholders from a financial point
of view than the transactions contemplated by this Agreement (including any
adjustment to the terms and conditions proposed by Cardinal in response to such
Competing Transaction) (a "Superior Proposal"). Allegiance will immediately
cease all existing activities, discussions and negotiations with any parties
conducted heretofore with respect to any proposal for a Competing Transaction
and request the return of all confidential information regarding Allegiance
provided to any such parties prior to the date hereof pursuant to the terms of
any confidentiality agreements or otherwise. In the event that prior to the
approval of the Merger by the Allegiance Stockholders the Board of Directors of
Allegiance receives a Superior Proposal that was not solicited or encouraged
after the date of this Agreement, and the Board of Directors of Allegiance
determines in good faith by resolution duly adopted after consultation with its
outside counsel (who may be its regularly engaged outside counsel) that the
failure to take such action would reasonably be expected to constitute a breach
of its fiduciary duties under Applicable Law, the Board of Directors of
Allegiance may (subject to this and the following sentences) withdraw, modify or
change, in a manner adverse to Cardinal, the Allegiance Board Recommendation
and/or comply with Rule 14e-2 promulgated under the Exchange Act with respect to
a Competing Transaction, provided that it gives Cardinal three business days'
prior written notice of its intention to do so (provided that the foregoing
shall in no way limit or otherwise affect Cardinal's right to terminate this
Agreement pursuant to Section 7.1(d) at such time as the requirements of such
subsection have been met). Any such withdrawal, modification or change of the
Allegiance Board Recommendation shall not change the approval of the Board of
Directors of Allegiance for purposes of causing any state takeover statute or
other state law to be inapplicable to the transactions contemplated hereby,
including the Merger, the Allegiance Stock Option Agreement or the Support
Agreements or change the obligation of Allegiance to present the Merger for
approval at a duly called Allegiance Stockholders Meeting on the earliest
practicable date determined in consultation with Cardinal. From and after the
execution of this 


                                      -38-
<PAGE>

Agreement, Allegiance shall promptly (but in any event within one calendar day)
advise Cardinal in writing of the receipt, directly or indirectly, of any
inquiries, discussions, negotiations, or proposals relating to a Competing
Transaction (including the specific terms thereof and the identity of the other
party or parties involved) and promptly furnish to Cardinal a copy of any such
written proposal in addition to any information provided to or by any third
party relating thereto. In addition, Allegiance shall promptly (but in any event
within one calendar day) advise Cardinal, in writing, if the Board of Directors
of Allegiance shall make any determination as to any Competing Transaction as
contemplated by the proviso to the first sentence of this Section 5.3(d).

          (e) Termination Right. If prior to the approval of the Merger by the
Allegiance Stockholders the Board of Directors of Allegiance shall determine in
good faith, after consultation with its financial and legal advisors, that any
written proposal from a third party for a Competing Transaction received after
the date hereof that was not solicited or encouraged by Allegiance or any of its
subsidiaries or affiliates in violation of this Agreement is more favorable to
the Allegiance Stockholders from a financial point of view than the transactions
contemplated by this Agreement (including any adjustment to the terms and
conditions of such transaction proposed in writing by Cardinal in response to
such Competing Transaction) and is in the best interest of the Allegiance
Stockholders and (x) the Board of Directors of Allegiance has determined in good
faith by resolution duly adopted after consultation with its outside counsel
(who may be its regularly engaged outside counsel) that the failure to enter
into such a Competing Transaction would reasonably be expected to constitute a
breach of the its fiduciary duties under Applicable Law and (y) Allegiance has
received a written opinion (a copy of which has been delivered to Cardinal) from
CSFB (or any other nationally recognized investment banking firm) that the
Competing Transaction is more favorable from a financial point of view to the
Allegiance Stockholders than the transactions contemplated by this Agreement
(including any adjustment to the terms and conditions of such transaction
proposed in writing by Cardinal), Allegiance may terminate this Agreement and
enter into a letter of intent, agreement-in-principle, acquisition agreement or
other similar agreement (each, an "Acquisition Agreement") with respect to such
Competing Transaction provided that, prior to any such termination, (i)
Allegiance has provided Cardinal written notice that it intends to terminate
this Agreement pursuant to this Section 5.3(e), identifying the Competing
Transaction then determined to be more favorable and the parties thereto and
delivering a copy of the Acquisition Agreement for such Competing Transaction in
the form to be entered into, and (ii) at least three full business days after
Allegiance has provided the notice referred to in clause (i) above (provided
that the resolution referred to in clause (x) above and the opinion referred to
in clause (y) above shall continue in effect without revision or modification),
Allegiance delivers to Cardinal (A) a written notice of termination of this
Agreement pursuant to this Section 5.3(e), (B) a check in the amount of
Cardinal's Costs (as defined in Section 7.2) as the same may have been estimated
by Cardinal in good faith prior to the date of such delivery (subject to an
adjustment payment between the parties upon Cardinal's definitive determination
of such Costs), plus the amount of the termination fee as provided in Section
7.2, (C) a written acknowledgment from Allegiance that (x) the termination of
this Agreement and the entry into the Acquisition Agreement for the Competing
Transaction will be a "Purchase Event" (as defined in the Allegiance Stock
Option Agreement) and (y) the Allegiance Stock Option Agreement shall be honored
in accordance with 


                                      -39-
<PAGE>

its terms and (D) a written acknowledgment from each other party to such
Competing Transaction that it is aware of the substance of Allegiance's
acknowledgment under clause (C) above and waives any right it may have to
contest the matters thus acknowledged by Allegiance.

          (f) Affiliates of Allegiance. Allegiance shall cause each such person
who may be at the Effective Time or was on the date hereof an "affiliate" of
Allegiance for purposes of Rule 145 under the Securities Act or applicable
accounting releases of the Commission with respect to pooling-of-interests
accounting treatment, to execute and deliver to Cardinal no less than 30 days
prior to the date of the Allegiance Stockholders Meeting, the written
undertakings in the form attached hereto as Exhibit A (the "Allegiance Affiliate
Letter"). No later than 45 days prior to such date, Allegiance, after
consultation with its outside counsel, shall provide Cardinal with a letter
(reasonably satisfactory to outside counsel to Cardinal) specifying all of the
persons or entities who, in Allegiance's opinion, may be deemed to be
"affiliates" of Allegiance under the preceding sentence. The foregoing
notwithstanding, Cardinal shall be entitled to place legends as specified in the
Allegiance Affiliate Letter on the certificates evidencing any of the Cardinal
Common Shares to be received by (i) any such "affiliate" of Allegiance specified
in such letter or (ii) any person Cardinal reasonably identifies (by written
notice to Allegiance) as being a person who may be deemed an "affiliate" for
purposes of Rule 145 under the Securities Act or applicable accounting releases
of the Commission with respect to pooling-of-interests accounting treatment,
pursuant to the terms of this Agreement, and to issue appropriate stop transfer
instructions to the transfer agent for the Cardinal Common Shares, consistent
with the terms of the Allegiance Affiliate Letter, regardless of whether such
person has executed the Allegiance Affiliate Letter and regardless of whether
such person's name appears on the letter to be delivered pursuant to the
preceding sentence.

          (g) Access. Allegiance shall permit representatives of Cardinal to
have appropriate access at all reasonable times to Allegiance's premises,
properties, books, records, contracts, documents, customers and suppliers.
Information obtained by Cardinal pursuant to this Section 5.3(g) shall be
subject to the provisions of the Confidentiality Agreement, which agreement
remains in full force and effect. No investigation conducted pursuant to this
Section 5.3(g) shall affect or be deemed to modify any representation or
warranty made in this Agreement.

          (h) Subsequent Financial Statements. Allegiance shall consult with
Cardinal prior to making publicly available its financial results for any period
after the date of this Agreement and prior to filing any Allegiance SEC
Documents after the date of this Agreement.

                                   ARTICLE VI.

                                   CONDITIONS

          6.1 Conditions to the Obligations of Each Party. The obligations of
Allegiance, Cardinal and Subcorp to consummate the Merger shall be subject to
the satisfaction of the following conditions:

                                      -40-
<PAGE>

          (a) (i) This Agreement, the Merger and the transactions contemplated
hereby shall have been approved and adopted by the Allegiance Stockholders in
the manner required by any Applicable Law, and (ii) the Share Issuance shall
have been approved by the Cardinal Shareholders in the manner required by any
Applicable Law and the applicable rules of the NYSE.

          (b) Any applicable waiting periods under the HSR Act relating to the
Merger and the transactions contemplated by this Agreement shall have expired or
been terminated and any other approvals of any Governmental Authority shall have
been obtained.

          (c) No provision of any applicable law or regulation and no judgment,
injunction, order or decree shall prohibit or enjoin the consummation of the
Merger or the transactions contemplated by this Agreement or limiting the
ownership or operation by Cardinal, Allegiance or any of their respective
subsidiaries of any material portion of the business or assets of Cardinal or
Allegiance.

          (d) There shall not be pending any Action instituted by any
Governmental Authority challenging or seeking to restrain or prohibit the
consummation of the Merger or any of the other transactions contemplated by this
Agreement.

          (e) The Commission shall have declared the Registration Statement
effective under the Securities Act, and no stop order or similar restraining
order suspending the effectiveness of the Registration Statement shall be in
effect and no proceedings for such purpose shall be pending before or threatened
by the Commission or any state securities administrator.

          (f) The Cardinal Common Shares to be issued in the Merger (including
pursuant to Cardinal Exchange Options) shall have been approved for listing on
the NYSE, subject to official notice of issuance.

          (g) Cardinal shall have received a letter, in form and substance
reasonably satisfactory to Cardinal, from Deloitte & Touche LLP dated the date
of the Effective Time stating that they concur with management's conclusion that
the Merger will qualify as a transaction to be accounted for by Cardinal in
accordance with the pooling-of-interests method of accounting under the
requirements of APB No. 16.

          6.2 Conditions to Obligations of Allegiance. The obligations of
Allegiance to consummate the Merger and the transactions contemplated hereby
shall be subject to the fulfillment of the following conditions unless waived by
Allegiance:

          (a) Each of the representations and warranties of each of Cardinal and
Subcorp set forth in Article III shall be true and correct in all respects (but
without regard to any materiality qualifications or references to Material
Adverse Effect contained in any specific representation or warranty) on the date
of this Agreement and on and as of the Determination Date (as defined in Section
8.3) as though made on and as of the Determination Date (except for
representations and warranties made as of a specified date, the accuracy of
which will be determined as of the specified date), except where any such
failure of the representations and 


                                      -41-
<PAGE>

warranties in the aggregate to be true and correct in all respects would not
reasonably be expected to have a Material Adverse Effect on Cardinal.

          (b) Each of Cardinal and Subcorp shall have performed in all material
respects all obligations and agreements and shall have complied in all material
respects with all covenants to be performed and complied with by it hereunder at
or prior to the Effective Time.

          (c) Each of Cardinal and Subcorp shall have furnished Allegiance with
a certificate dated the Closing Date signed on behalf of it by the Chairman or
President to the effect that the conditions set forth in Sections 6.2(a) and (b)
have been satisfied.

          (d) Allegiance shall have received the opinion of Davis Polk &
Wardwell, dated on or prior to the effective date of the Registration Statement,
to the effect that (i) the Merger will constitute a reorganization under section
368(a) of the Code, (ii) Allegiance, Cardinal and Subcorp will each be a party
to that reorganization, and (iii) no gain or loss will be recognized by the
shareholders of Allegiance upon the receipt of Cardinal Common Shares in
exchange for shares of Allegiance Common Stock pursuant to the Merger except
with respect to cash received in lieu of fractional share interests in Cardinal
Common Shares.

          6.3 Conditions to Obligations of Cardinal and Subcorp. The obligations
of Cardinal and Subcorp to consummate the Merger and the other transactions
contemplated hereby shall be subject to the fulfillment of the following
conditions unless waived by Cardinal:

          (a) Each of the representations and warranties of Allegiance set forth
in Article IV (other than the representations and warranties of Allegiance set
forth in Section 4.4) shall be true and correct in all respects (but without
regard to any materiality qualifications or references to Material Adverse
Effect contained in any specific representation or warranty) on the date of this
Agreement and on and as of the Determination Date as though made on and as of
the Determination Date (except for representations and warranties made as of a
specified date, the accuracy of which will be determined as of the specified
date), except where any such failure of the representations and warranties in
the aggregate to be true and correct in all respects would not reasonably be
expected to have a Material Adverse Effect on Allegiance. The representations
and warranties of Allegiance set forth in Section 4.4 of this Agreement shall be
true and correct in all material respects on the date of this Agreement and on
and as of the Closing Date as though made on and as of the Closing Date (except
for representations and warranties made as of a specified date, the accuracy of
which will be determined as of the specified date).

          (b) Allegiance shall have performed in all material respects all
obligations and agreements and shall have complied in all material respects with
all covenants to be performed and complied with by it hereunder at or prior to
the Effective Time.

          (c) Allegiance shall have furnished Cardinal with a certificate dated
the Closing Date signed on its behalf by its Chairman or President to the effect
that the conditions set forth in Sections 6.3(a) and (b) have been satisfied.

                                      -42-
<PAGE>

          (d) Cardinal shall be satisfied, in its sole discretion, that the
limitations set forth in Section 1.1 of the agreement set forth in Section
6.3(d) of the Cardinal Disclosure Schedule shall not apply to the business or
operations of Cardinal, Cardinal's subsidiaries or the Surviving Corporation
from and after the Effective Time.

          (e) There shall not have been a breach of the Allegiance Stock Option
Agreement.

          (f) The amendments to the Change in Control Agreement, between
Allegiance and each employee of Allegiance set forth in Section 4.24 to the
Allegiance Disclosure Schedule, each as entered into as of the date of this
Agreement, shall be in full force and effect and shall not have been terminated.


                                  ARTICLE VII.

                            TERMINATION AND AMENDMENT

          7.1 Termination. This Agreement may be terminated and the Merger may
be abandoned at any time prior to the Effective Time (notwithstanding any
approval of this Agreement by Allegiance Stockholders and Cardinal
Shareholders):

          (a) by mutual written consent of Cardinal and Allegiance;

          (b) by either Cardinal or Allegiance if there shall be any law or
     regulation that makes consummation of the Merger illegal or otherwise
     prohibited, or if any judgment, injunction, order or decree of a court or
     other competent Governmental Authority (which the parties shall have used
     all reasonable efforts to resist, resolve or lift, as applicable, in
     accordance with Section 5.1(a)) enjoining Cardinal or Allegiance from
     consummating the Merger shall have been entered and such judgment,
     injunction, order or decree shall have become final and nonappealable;

          (c) by either Cardinal or Allegiance if the Merger shall not have been
     consummated before May 15, 1999, provided, however, that the right to
     terminate this Agreement under this Section 7.1(c) shall not be available
     to any party whose failure or whose affiliate's failure to perform any
     material covenant or obligation under this Agreement has been the cause of
     or resulted in the failure of the Merger to occur on or before such date;

          (d) by Cardinal if the Board of Directors of Allegiance shall
     withdraw, modify or change the Allegiance Board Recommendation in a manner
     adverse to Cardinal, if the Board of Directors of Allegiance approves or
     recommends any Competing Transaction;

          (e) by Cardinal or Allegiance if at the Allegiance Stockholders
     Meeting (including any adjournment or postponement thereof) the requisite
     vote of the Allegiance


                                      -43-
<PAGE>

     Stockholders to approve the Merger and the transactions contemplated hereby
     shall not have been obtained;

          (f) by Cardinal or Allegiance if at the Cardinal Shareholders Meeting
     (including any adjournment or postponement thereof) the requisite vote of
     the Cardinal Shareholders to approve the Share Issuance shall not have been
     obtained;

          (g) by Allegiance, pursuant to Section 5.3(e);

          (h) by Cardinal if Allegiance shall have breached any of its
     obligations under the Allegiance Stock Option Agreement;

          (i) by Cardinal if at any time Cardinal shall have been advised in
     writing by Deloitte & Touche LLP that the condition set forth in Section
     6.1(g) is not capable of being satisfied, provided that Cardinal has given
     Allegiance at least five business days' prior notice;

          (j) by Cardinal or Allegiance if there shall have been a material
     breach by the other of any of its covenants or agreements contained in this
     Agreement and such breach shall not have been cured within 30 days after
     notice thereof shall have been received by the party alleged to be in
     breach; or

          (k) by Allegiance if the Board of Directors of Cardinal shall
     withdraw, modify or change its recommendation to Cardinal Shareholders that
     they approve the Share Issuance

          7.2 Effect of Termination. In the event of the termination of this
Agreement pursuant to Section 7.1, this Agreement, except for the provisions of
the second sentence of each of Section 5.2(g) and Section 5.3(g) and the
provisions of Sections 7.2 and 8.11, shall become void and have no effect,
without any liability on the part of any party or its directors, officers or
stockholders. Notwithstanding the foregoing, nothing in this Section 7.2 shall
relieve any party to this Agreement of liability for a material breach of any
provision of this Agreement and provided, further, however, that if it shall be
judicially determined that termination of this Agreement was caused by an
intentional breach of this Agreement, then, in addition to other remedies at law
or equity for breach of this Agreement, the party so found to have intentionally
breached this Agreement shall indemnify and hold harmless the other parties for
their respective out-of-pocket costs, fees and expenses of their counsel,
accountants, financial advisors and other experts and advisors as well as fees
and expenses incident to negotiation, preparation and execution of this
Agreement and related documentation and shareholders' meetings and consents
("Costs"). If this Agreement is terminated (A) for any reason pursuant to
Section 7.1 (other than a termination pursuant to Section 7.1(a) (prior to the
public announcement of a Competing Transaction), 7.1(b), 7.1(c) (other than a
termination by Cardinal pursuant to Section 7.1(c) if Allegiance's failure to
perform any material covenant or obligation under this Agreement has been the
cause of or resulted in the failure of the Merger to occur on or before May 15,
1999), 7.1(e), 7.1(f), 7.1(i), 7.1(j) or 7.1(k)) or (B) pursuant to Section
7.1(e) and at any time prior to such termination there shall have been made to
Allegiance or publicly disclosed a Competing 


                                      -44-
<PAGE>

Transaction with respect to Allegiance, and within 12 months after the date of
termination Allegiance enters into an Acquisition Agreement for a Business
Combination (as defined below) or consummates a Business Combination, then
Allegiance will, in the case of a termination by Cardinal, within three business
days following any such termination or, in the case of a termination by
Allegiance, (except in each case, if the termination is pursuant to Section
7.1(e), then, prior to the earlier consummation of a Business Combination or
execution of a definitive agreement with respect thereto) concurrently with such
termination, pay to Cardinal in cash by wire transfer in immediately available
funds to an account designated by Cardinal (i) in reimbursement for Cardinal's
expenses an amount in cash equal to the aggregate amount of Cardinal's Costs
incurred in connection with pursuing the transactions contemplated by this
Agreement, including, without limitation, legal, accounting and investment
banking fees, up to but not in excess of an amount equal to $5 million in the
aggregate and (ii) a termination fee in an amount equal to $155 million. For the
purposes of this Section 7.2, "Business Combination" means (i) a merger,
consolidation, share exchange, business combination or similar transaction
involving Allegiance as a result of which the Allegiance Stockholders prior to
such transaction in the aggregate cease to own at least 60% of the voting
securities of the entity surviving or resulting from such transaction (or the
ultimate parent entity thereof), (ii) a sale, lease, exchange, transfer or other
disposition of more than 30% of the assets of Allegiance and its subsidiaries,
taken as a whole, in a single transaction or a series of related transactions,
or (iii) the acquisition, by a person (other than Cardinal or any affiliate
thereof) or group (as such term is defined under Section 13(d) of the Exchange
Act and the rules and regulations thereunder) of beneficial ownership (as
defined in Rule 13d-3 under the Exchange Act) of more than 20% of the Allegiance
Common Stock whether by tender or exchange offer or otherwise.

          7.3 Amendment. This Agreement may be amended by the parties hereto, by
action taken or authorized by their respective Boards of Directors, at any time
before or after adoption of this Agreement by Allegiance Stockholders, but after
any such approval, no amendment shall be made which by law requires further
approval or authorization by the Allegiance Stockholders without such further
approval or authorization. Notwithstanding the foregoing, this Agreement may not
be amended except by an instrument in writing signed on behalf of each of the
parties hereto.

          7.4 Extension; Waiver. At any time prior to the Effective Time,
Cardinal (with respect to Allegiance) and Allegiance (with respect to Cardinal
and Subcorp) by action taken or authorized by their respective Boards of
Directors, may, to the extent legally allowed, (a) extend the time for the
performance of any of the obligations or other acts of such party, (b) waive any
inaccuracies in the representations and warranties contained herein or in any
document delivered pursuant hereto and (c) waive compliance with any of the
agreements or conditions contained herein. Any agreement on the part of a party
hereto to any such extension or waiver shall be valid only if set forth in a
written instrument signed on behalf of such party.


                                      -45-
<PAGE>

                                  ARTICLE VIII.

                                  MISCELLANEOUS

          8.1 Survival of Representations and Warranties. The representations
and warranties made herein by the parties hereto shall not survive the Effective
Time. This Section 8.1 shall not limit any covenant or agreement of the parties
hereto, which by its terms contemplates performance after the Effective Time or
after the termination of this Agreement.

          8.2 Notices. All notices and other communications hereunder shall be
in writing and shall be deemed given if delivered personally, telecopied (which
is confirmed) or dispatched by a nationally recognized overnight courier service
to the parties at the following addresses (or at such other address for a party
as shall be specified by like notice):

          (a) if to Cardinal or Subcorp:

               Cardinal Health, Inc.
               5555 Glendon Court
               Dublin, Ohio  43016
               Attention:  Robert D. Walter
               Telecopy  No.:  (614) 717-8919



               with a copy to

               David A. Katz, Esq.
               Wachtell, Lipton, Rosen & Katz
               51 West 52nd Street
               New York, New York  10019
               Telecopy No.:  (212) 403-2000

          (b) if to Allegiance:

               Allegiance Corporation
               1430 Waukegan Road
               McGaw Park, Illiniois  60085
               Attention:  Lester B. Knight
               Telecopy No.:  (847) 578-4448



                                      -46-
<PAGE>

               with a copy to

               John A. Bick, Esq.
               Davis Polk & Wardwell
               450 Lexington Avenue
               New York, New York  10017
               Telecopy No:  (212) 450-4800

          8.3 Interpretation. When a reference is made in this Agreement to an
Article or Section, such reference shall be to an Article or Section of this
Agreement unless otherwise indicated. The headings and the table of contents
contained in this Agreement are for reference purposes only and shall not affect
in any way the meaning or interpretation of this Agreement. When a reference is
made in this Agreement to Allegiance, such reference shall be deemed to include
any and all subsidiaries of Allegiance, individually and in the aggregate,
except for Sections 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.8, 4.15, 4.21, 4.22 and
4.23. For the purposes of any provision of this Agreement, a "Material Adverse
Effect" with respect to any party shall be deemed to occur if (i) in any
individual representation or warranty in this Agreement, if the aggregate
consequences of breaches and inaccuracies of such representation and warranty
would have a material adverse effect on the business, results of operations or
financial condition of such party and its subsidiaries taken as a whole, and
(ii) elsewhere in the Agreement, the aggregate consequences of all breaches and
inaccuracies of covenants and representations of such party under this
Agreement, when read without any exception or qualification for a material
adverse effect, would have a material adverse effect on the business, results of
operations or financial condition of such party and its subsidiaries taken as a
whole; provided, however, that a Material Adverse Effect with respect to any
party shall not include any change in or effect upon the business, assets
(including intangible assets), liabilities (contingent or otherwise), condition
(financial or otherwise), or results of operations of such party or any of its
subsidiaries directly or indirectly arising out of or attributable to the
economy, the securities markets in general or the industries generally in which
a party and its subsidiaries operate, or to any decrease in the market price of
Cardinal Common Shares in the case of Cardinal or Allegiance Common Stock in the
case of Allegiance (but, in either case, not any change or effect underlying
such decrease to the extent such change or effect would otherwise constitute a
Material Adverse Effect on such party). For purposes of this Agreement, a
"subsidiary" when used with respect to any party means any corporation or other
organization, incorporated or unincorporated, (i) of which such party or another
subsidiary of such party is a general partner (excluding partnerships, the
general partnership interests of which held by such party or any subsidiary of
such party do not have 50% or more of the voting interests in such partnership)
or (ii) 50% or more of the securities or other interests of which having by
their terms ordinary voting power to elect at least 50% of the Board of
Directors or others performing similar functions with respect to such
corporation or other organization is directly or indirectly owned or controlled
by such party or one or more of its subsidiaries (or if there are no such voting
securities or interests, 50% or more of the equity interests of which is
directly or indirectly owned or controlled by such party or one or more of its
subsidiaries). For the purposes of Section 6.2(a) and Section 6.3(a), the
"Determination Date" shall be the earlier of the Closing Date or the tenth
business day after the satisfaction of all of the conditions set forth in
Article VI (other than those conditions that by their nature are to be 


                                      -47-
<PAGE>

satisfied at the Closing, and other than the conditions set forth in Sections
6.2(a), 6.3(a) and 6.3(d)).

          8.4 Counterparts. This Agreement may be executed in counterparts,
which together shall constitute one and the same Agreement. The parties may
execute more than one copy of the Agreement, each of which shall constitute an
original.

          8.5 Entire Agreement. This Agreement (including the documents and the
instruments referred to herein), the Support Agreements, the Allegiance Stock
Option Agreement and the Confidentiality Agreement constitute the entire
agreement among the parties and supersede all prior agreements and
understandings, agreements or representations by or among the parties, written
and oral, with respect to the subject matter hereof and thereof.

          8.6 Third-Party Beneficiaries. Except for the agreement set forth in
Section 5.2(d), nothing in this Agreement, express or implied, is intended or
shall be construed to create any third-party beneficiaries.

          8.7 Governing Law. Except to the extent that the laws of the
jurisdiction of organization of any party hereto, or any other jurisdiction, are
mandatorily applicable to the Merger or to matters arising under or in
connection with this Agreement, this Agreement shall be governed by the laws of
the State of Delaware. All actions and proceedings arising out of or relating to
this Agreement shall be heard and determined in any state or federal court
sitting in the City of Wilmington, Delaware.

          8.8 Consent to Jurisdiction; Venue.

          (a) Each of the parties hereto irrevocably submits to the exclusive
jurisdiction of the state courts of Delaware and to the jurisdiction of the
United States District Court for the District of Delaware, for the purpose of
any action or proceeding arising out of or relating to this Agreement and each
of the parties hereto irrevocably agrees that all claims in respect to such
action or proceeding may be heard and determined exclusively in any Delaware
state or federal court sitting in the City of Wilmington, Delaware. Each of the
parties hereto agrees that a final judgment in any action or proceeding shall be
conclusive and may be enforced in other jurisdictions by suit on the judgment or
in any other manner provided by law.

          (b) Each of the parties hereto irrevocably consents to the service of
any summons and complaint and any other process in any other action or
proceeding relating to the Merger, on behalf of itself or its property, by the
personal delivery of copies of such process to such party. Nothing in this
Section 8.8 shall affect the right of any party hereto to serve legal process in
any other manner permitted by law.

          8.9 Specific Performance. The transactions contemplated by this
Agreement are unique. Accordingly, each of the parties acknowledges and agrees
that, in addition to all other remedies to which it may be entitled, each of the
parties hereto is entitled to a decree of specific performance, provided such
party is not in material default hereunder.

                                      -48-
<PAGE>

          8.10 Assignment. Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned by any of the parties
hereto (whether by operation of law or otherwise) without the prior written
consent of the other parties. Subject to the preceding sentence, this Agreement
shall be binding upon, inure to the benefit of and be enforceable by the parties
and their respective successors and assigns.

          8.11 Expenses. Subject to the provisions of Section 7.2, all costs and
expenses incurred in connection with this Agreement and the transactions
contemplated hereby and thereby shall be paid by the party incurring such
expenses, except that those expenses incurred in connection with filing,
printing and mailing the Registration Statement and the Joint Proxy Statement
(including filing fees related thereto) will be shared equally by Cardinal and
Allegiance.
















                                      -49-
<PAGE>


          IN WITNESS WHEREOF, Cardinal, Subcorp and Allegiance have signed this
Agreement as of the date first written above.


                                    CARDINAL HEALTH, INC.

                                    By: /s/ Robert D. Walter 
                                       ------------------------
                                       Name:  Robert D. Walter
                                       Title:

                                    BOXES MERGER CORP.

                                    By: /s/ Robert D. Walter       
                                       ------------------------
                                       Name: Robert D. Walter
                                       Title:

                                    ALLEGIANCE CORPORATION

                                    By:/s/ Lester B. Knight               
                                       ------------------------
                                       Name: Lester B. Knight
                                       Title:






                                      -50-

                                                                    EXHIBIT 2.2
                             STOCK OPTION AGREEMENT


                  STOCK OPTION AGREEMENT ("Option Agreement") dated October 8,
1998, between Cardinal Health, Inc., an Ohio corporation ("Cardinal"), and
Allegiance Corporation, a Delaware corporation ("Allegiance").


                              W I T N E S S E T H:

                  WHEREAS, the Board of Directors of Cardinal and the Board of
Directors of Allegiance have approved an Agreement and Plan of Merger dated as
of even date herewith (the "Merger Agreement") providing for the merger of a
wholly owned subsidiary of Cardinal with and into Allegiance;

                  WHEREAS, as a condition to Cardinal's entering into the Merger
Agreement, Cardinal has required that Allegiance agree, and Allegiance has
agreed, to grant to Cardinal the option set forth herein to purchase authorized
but unissued shares of Allegiance Common Stock;

                  NOW, THEREFORE, in consideration of the premises herein
contained, the parties agree as follows:

                  1. Definitions.

                  Capitalized terms used but not defined herein shall have the
same meanings as in the Merger Agreement.

                  2. Grant of Option.

                  Subject to the terms and conditions set forth herein,
Allegiance hereby grants to Cardinal an option (the "Option") to purchase up to
22,284,538 authorized and unissued shares of Allegiance Common Stock (the
"Option Shares") at a price per share equal to the lower of (x) $38.46 or (y)
the Exchange Ratio multiplied by the Closing Price (as defined below) of
Cardinal Common Shares on the date of exercise (the "Purchase Price") payable in
cash as provided in Section 4 hereof. As used herein, the term "Closing Price"
as of any date with respect to any Cardinal Common Shares means the average of
the closing prices (or, if such securities should not trade on any trading day,
the average of the bid and asked prices therefor on such day) of such Cardinal
Common Shares as reported on the NYSE Composite Tape during the five consecutive
trading days ending on (and including) the trading day immediately prior to such
date (or, if such Cardinal Common Shares are not traded on the NYSE, on such
other exchange or quotation system on which such Cardinal Common Shares are then
traded).
<PAGE>

                  3. Exercise of Option.

                   (a) Cardinal may exercise the Option, in whole or in part, at
any time or from time to time if a Purchase Event (as defined below) shall have
occurred and the Merger Agreement shall have been terminated; provided, however,
that, to the extent the Option shall not have been exercised, it shall terminate
and be of no further force and effect upon the earliest to occur of:

                  (i) the Effective Time of the Merger;

                  (ii) if no Purchase Event has occurred and the Merger
         Agreement is terminated in accordance with its terms pursuant to
         Section 7.1(a), Section 7.1(b), Section 7.1(c) (if the termination is
         by Allegiance because of a failure by Cardinal or an affiliate of
         Cardinal to perform any material covenant or obligation under the
         Merger Agreement, which failure has been the cause of, or resulted in,
         the failure of the Merger to occur on or before May 15, 1999), Section
         7.1(f), Section 7.1(i), Section 7.1(j), or Section 7.1(k) of the Merger
         Agreement, then at the time of such termination;

                  (iii) if a Purchase Event has occurred pursuant to Section
         3(b)(iv), hereof and the Merger Agreement is terminated in accordance
         with its terms pursuant to Section 7.1(e) thereof, then at 5:00 p.m.
         New York City time on the date which is twelve months after such
         termination; or

                  (iv) if a Purchase Event occurs other than pursuant to Section
         3(b)(iv) hereof, then at 5:00 p.m. New York City time, on the date that
         is 135 days following the occurrence of the earliest Purchase Event;

and provided, further, that if the Option cannot be exercised before its date of
termination as a result of any injunction, order or similar restraint issued by
a court of competent jurisdiction, the Option shall expire on the tenth business
day after such injunction, order or restraint shall have been dissolved or when
such injunction, order or restraint shall have become permanent and no longer
subject to appeal, as the case may be, but in no event later than twelve months
after the occurrence of a Purchase Event.

                   (b) As used herein, a "Purchase Event" shall mean any of the
following events:

                   (i) any person (other than Cardinal or any of its
         subsidiaries) shall (A) become the Beneficial Owner (as defined below),
         or shall acquire the right to become the Beneficial Owner, of 15% or
         more of either the then-outstanding Allegiance Common Stock or any
         class of then-outstanding voting securities of Allegiance or any of its
         subsidiaries, or (B) purchase, lease or otherwise acquire 30% or more
         of the assets of Allegiance and its subsidiaries, taken as a whole
         (except that the inadvertent acquisition by any person of Beneficial
         Ownership (as defined below) of 15% or more of the Allegiance Common
         Stock shall not be a Purchase Event if such person divests as promptly
         as practicable (but in any event, within ten business days of notice
         from 

                                      -2-
<PAGE>

         Allegiance to such person) a sufficient number of shares of Allegiance
         Common Stock so that such person would then be the Beneficial Owner of
         less than 15% of the then-outstanding Allegiance Common Stock);

                   (ii) Allegiance or any of its subsidiaries shall enter into,
         authorize, recommend, propose or publicly announce an intention to
         enter into, any agreement, arrangement or understanding with any person
         (other than Cardinal or any of its subsidiaries) pursuant to which such
         person shall (A) become the Beneficial Owner, or shall acquire the
         right to become the Beneficial Owner, of 15% or more of either the
         then-outstanding Allegiance Common Stock or any class of
         then-outstanding voting securities of Allegiance or any of its
         subsidiaries, or (B) purchase, lease or otherwise acquire 30% or more
         of the assets of Allegiance and its subsidiaries, taken as a whole;

                   (iii) the Board of Directors of Allegiance shall withdraw,
         modify or change the Allegiance Board Recommendation in a manner
         adverse to Cardinal, shall approve or recommend any Competing
         Transaction;

                   (iv) the Merger Agreement shall be terminated pursuant to
         Section 7.1(e) thereof and at any time prior to such termination there
         shall have been made to Allegiance or publicly disclosed a Competing
         Transaction with respect to Allegiance; or

                   (v) the Merger Agreement shall have been terminated pursuant
         to Section 7.1(c) (if the termination is by Cardinal because of a
         failure by Allegiance or an affiliate of Allegiance to perform any
         material covenant or obligation under the Merger Agreement which
         failure has been the cause of or resulted in the failure of the Merger
         to occur on or before May 15, 1999), Section 7.1(d), Section 7.1(g), or
         Section 7.1(h) of the Merger Agreement.

                   (c) As used herein, the terms "Beneficial Ownership",
"Beneficial Owner" and "Beneficially Own" shall have the meanings ascribed to
them in Rule 13d-3 under the Exchange Act. As used herein, "person" shall have
the meaning specified in Sections 3(a)(9) and 13(d)(3) of the Exchange Act.

                   (d) In the event Cardinal wishes to exercise the Option, it
shall deliver to Allegiance a written notice (the date of receipt of which being
herein referred to as the "Notice Date") specifying (i) the total number of
shares it intends to purchase pursuant to such exercise and (ii) a place and
date not earlier than five business days nor later than 60 calendar days from
the Notice Date for the closing of such purchase (the "Closing Date"); provided
that if the closing of the purchase and sale pursuant to the Option (the
"Closing") cannot be consummated by reason of any applicable judgment, decree,
order, law or regulation, the period of time that otherwise would run pursuant
to this sentence shall run instead from the date on which such restriction on
consummation has expired or been terminated; and, provided further that, without
limiting the foregoing, if prior notification to or approval of any regulatory
authority is required in connection with such purchase, Cardinal and, if
applicable, Allegiance shall promptly file the required notice or application
for approval and shall expeditiously process the same (and 


                                       -3-
<PAGE>

Allegiance shall cooperate with Cardinal in the filing of any such notice or
application and the obtaining of any such approval), and the period of time that
otherwise would run pursuant to this sentence shall run instead from the date on
which, as the case may be, (i) any required notification period has expired or
been terminated or (ii) such approval has been obtained, and in either event,
any requisite waiting period has passed.

                  (e) In the event (i) Cardinal receives official notice that an
approval of any regulatory authority required for the purchase of the Option
Shares would not be issued or granted or (ii) a Closing Date shall not have
occurred within twelve months after the related Notice Date due to the failure
to obtain any such required approval, Cardinal shall be entitled to exercise its
right as set forth in Section 7 hereof or, to the extent legally permitted, to
exercise the Option in connection with the resale of Allegiance Common Stock or
other securities pursuant to a registration statement as provided in Section 9
hereof. The provisions of this Section 3 and Section 6 hereof shall apply with
appropriate adjustments to any such exercise.

                  4. Payment and Delivery of Certificates.

                  (a) At the Closing, referred to in Section 3 hereof, on the
Closing Date, Cardinal shall pay to Allegiance the aggregate Purchase Price for
the shares of Allegiance Common Stock purchased pursuant to the exercise of the
Option in immediately available funds by wire transfer to a bank account
designated not later than one business day prior to such Closing Date by
Allegiance.

                  (b) At such Closing, simultaneously with the delivery of cash
as provided in Section 4(a), Allegiance shall deliver to Cardinal a certificate
or certificates representing the number of shares of Allegiance Common Stock
purchased by Cardinal, registered in the name of Cardinal or a nominee
designated in writing by Cardinal, which shares shall be fully paid and
non-assessable and free and clear of all liens, claims, charges and encumbrances
of any kind whatsoever.

                  (c) If at the time of issuance of any Allegiance Common Stock
pursuant to any exercise of the Option Allegiance shall have issued any share
purchase rights or similar securities to holders of Allegiance Common Stock,
then each such share of Allegiance Common Stock shall also represent rights with
terms substantially the same as and at least as favorable to Cardinal as those
issued to other holders of Allegiance Common Stock.

                  (d) Certificates for Allegiance Common Stock delivered at any
Closing hereunder shall be endorsed with a restrictive legend which shall read
substantially as follows:

                  "The shares represented by this certificate are subject to
                  certain provisions of an agreement between the registered
                  holder hereof and Allegiance Corporation, a copy of which is
                  on file at the principal office of Allegiance Corporation and
                  to resale restrictions arising under the Securities Act of
                  1933, as amended, and any applicable state securities laws. A
                  copy of such agreement will be provided to the 


                                      -4-
<PAGE>

                  holder hereof without charge upon receipt by Allegiance
                  Corporation of a written request therefor."

It is understood and agreed that the above legend shall be removed by delivery
of substitute certificate(s) without such legend in connection with a transfer
or sale if (i) Allegiance has been furnished with an opinion of counsel
reasonably satisfactory to Allegiance, in a form reasonably satisfactory to
counsel for Allegiance, that such transfer or sale will not violate the
Securities Act or applicable securities laws of any state or (ii) such transfer
or sale shall have been registered and qualified pursuant to the Securities Act
and any applicable state securities laws.

                  5. Authorization, etc.

                  (a) Allegiance hereby represents and warrants to Cardinal
that:

                  (i) Allegiance has full corporate authority to execute and
         deliver this Option Agreement and to consummate the transactions
         contemplated hereby;

                  (ii) such execution, delivery and consummation have been
         authorized by the Board of Directors of Allegiance, and no other
         corporate proceedings are necessary therefor;

                  (iii) this Option Agreement has been duly and validly executed
         and delivered by Allegiance and represents a valid and legally binding
         obligation of Allegiance, enforceable against Allegiance in accordance
         with its terms; and

                  (iv) Allegiance has taken all necessary corporate action to
         authorize and reserve and permit it to issue and, at all times from the
         date hereof through the date of the exercise in full or the expiration
         or termination of the Option, shall have reserved for issuance upon
         exercise of the Option, 22,284,538 shares of Allegiance Common Stock
         (subject to adjustment as provided herein), all of which, upon issuance
         in accordance with the terms of this Option Agreement, shall be duly
         authorized, validly issued, fully paid and nonassessable, and shall be
         delivered free and clear of all claims, liens, encumbrances and
         security interests and not subject to any preemptive rights of any
         stockholder of Allegiance.

                  (b) Allegiance hereby agrees that, prior to the termination of
the Option pursuant to Section 3(a) hereof, Allegiance shall not take, or allow
to be taken, any action that could result in the representations and warranties
set forth in Section 5(a) hereof becoming false or inaccurate.

                  (c) Cardinal hereby represents and warrants to Allegiance
that:

                  (i) Cardinal has full corporate authority to execute and
         deliver this Option Agreement and to consummate the transactions
         contemplated hereby;

                                      -5-
<PAGE>

                  (ii) such execution, delivery and consummation have been
         authorized by all requisite corporate action by Cardinal, and no other
         corporate proceedings are necessary therefor;

                  (iii) this Option Agreement has been duly and validly executed
         and delivered by Cardinal and represents a valid and legally binding
         obligation of Cardinal, enforceable against Cardinal in accordance with
         its terms; and

                  (iv) any Allegiance Common Stock acquired by Cardinal upon
         exercise of the Option will be acquired for its own account and not be
         taken with a view to the public distribution thereof and will not be
         transferred or otherwise disposed of except in compliance with the
         Securities Act.

                  (d) Cardinal hereby agrees that, prior to the termination of
the Option pursuant to Section 3(a) hereof, Cardinal shall not take, or allow to
be taken, any action that could result in the representations and warranties set
forth in Section 5(c) hereof becoming false or inaccurate.

                  6. Adjustment upon Changes in Capitalization.

                  In the event of any change in Allegiance Common Stock by
reason of stock dividends, split-ups, recapitalizations or the like, the type
and number of Option Shares, and the purchase price per share, as the case may
be, shall be adjusted appropriately. In the event that any additional shares of
Allegiance Common Stock are issued after the date of this Option Agreement
(other than pursuant to an event described in the preceding sentence or pursuant
to this Option Agreement or options granted under employee benefit plans), the
number of Option Shares shall be adjusted so that, after such issuance, it
equals at least 19.9% of the number of shares of Allegiance Common Stock then
issued and outstanding (without considering any shares subject to or issued
pursuant to the Option).

                  7. Repurchase.

                  (a) At the request of Cardinal, at any time from and after the
occurrence of a Purchase Event and ending 135 days immediately thereafter (the
"Cardinal Repurchase Period"), Allegiance (or any successor entity thereof)
shall repurchase the Option from Cardinal together with all (but not less than
all) shares of Allegiance Common Stock purchased by Cardinal pursuant thereto
with respect to which Cardinal then has Beneficial Ownership, at a price (when
calculated on a per-share basis, the "Per Share Repurchase Price") equal to the
sum of:

                  (i) The difference between (A) the "Market/Tender Offer Price"
         for shares of Allegiance Common Stock (defined as the higher of (x) the
         highest price per share at which a tender or exchange offer has been
         made for shares of Allegiance Common Stock or (y) the highest closing
         price per share of Allegiance Common Stock as reported by the NYSE
         Composite Tape for any day within that portion of the Cardinal
         Repurchase Period that precedes the date Cardinal gives notice of the
         required repurchase under this Section 


                                      -6-
<PAGE>

         7) and (B) the Purchase Price (subject to adjustment as provided in
         Section 6 hereof), multiplied by the number of shares of Allegiance
         Common Stock with respect to which the Option has not been exercised,
         but only if such Market/Tender Offer Price is greater than such
         exercise price;

                  (ii) The exercise price paid by Cardinal for any shares of
         Allegiance Common Stock acquired pursuant to the Option; and

                  (iii) The difference between the Market/Tender Offer Price and
         the exercise price paid by Cardinal for any shares of Allegiance Common
         Stock purchased pursuant to the exercise of the Option, multiplied by
         the number of shares so purchased, but only if such Market/Tender Offer
         Price is greater than such exercise price.

                  (b) In the event Cardinal exercises its rights under this
Section 7, Allegiance shall, within 10 business days thereafter, pay the
required amount to Cardinal by wire transfer of immediately available funds to
an account designated by Cardinal and Cardinal shall surrender to Allegiance the
Option and the certificates evidencing the shares of Allegiance Common Stock
purchased thereunder with respect to which Cardinal then has Beneficial
Ownership.

                  (c) In determining the Market/Tender Offer Price, the value of
any consideration other than cash shall be determined by an independent
nationally recognized investment banking firm selected by Cardinal.

                  8. Repurchase at Option of Allegiance.

                  Except to the extent that Cardinal shall have previously
exercised its rights under Section 7, at the request of Allegiance during the
six-month period commencing 135 days following the first occurrence of a
Purchase Event, Allegiance may repurchase from Cardinal, and Cardinal shall sell
to Allegiance, all (but not less than all) of the Allegiance Common Stock
acquired by Cardinal pursuant to the Option and with respect to which Cardinal
has Beneficial Ownership at the time of such repurchase at a price per share
equal to the greater of (i) 110% of the Market/Tender Offer Price per share
(calculated in the manner set forth in Section 7(a)(i) hereof but utilizing the
period beginning on the occurrence of a Purchase Event and ending on the date
Allegiance exercises its repurchase right pursuant to this Section 8), (ii) the
Per Share Repurchase Price or (iii) the sum of (A) the aggregate Purchase Price
of the shares so repurchased, plus (B) interest on the aggregate Purchase Price
paid for the shares so repurchased from the date of purchase by Cardinal to the
date of repurchase at the highest rate of interest announced by Bank One,
Columbus, NA as its prime or base lending or reference rate during such period,
less any dividends received on the shares so repurchased. Any repurchase under
this Section 8 shall be consummated in accordance with Section 7(b) hereof.

                  9. Registration Rights.

                  At any time after a Closing, Allegiance shall, if requested by
any holder or Beneficial Owner of shares of Allegiance Common Stock issued upon
exercise of the Option 


                                      -7-
<PAGE>

(each a "Holder"), as expeditiously as possible file a registration statement on
a form for general use under the Securities Act if necessary in order to permit
the sale or other disposition of the shares of Allegiance Common Stock that have
been acquired upon exercise of the Option in accordance with the intended method
of sale or other disposition requested by any such Holder. Each such Holder
shall provide all information reasonably requested by Allegiance for inclusion
in any registration statement to be filed hereunder. Allegiance shall use its
reasonable best efforts to cause such registration statement first to become
effective and then to remain effective for such period not in excess of 135 days
from the day such registration statement first becomes effective as may be
reasonably necessary to effect such sales or other dispositions. The
registration effected under this Section 9 shall be at Allegiance's expense
except for underwriting commissions and the fees and disbursements of such
Holders' counsel attributable to the registration of such Allegiance Common
Stock. In no event shall Allegiance be required to effect more than two
registrations hereunder. The filing of any registration statement required
hereunder may be delayed for such period of time (not to exceed 90 days) as may
reasonably be required to facilitate any public distribution by Allegiance of
Allegiance Common Stock, if a special audit of Allegiance would otherwise be
required in connection therewith, or at a time during which Allegiance is in
possession of material information concerning it, its business affairs or a
material transaction, in each case, the public disclosure of which could have a
material adverse effect on Allegiance or significantly disrupt such material
transaction. If requested by any such Holder in connection with such
registration, Allegiance shall become a party to any underwriting agreement
relating to the sale of such shares on terms and including obligations and
indemnities that are customary for parties similarly situated. Upon receiving
any request for registration under this Section 9 from any Holder, Allegiance
agrees to send a copy thereof to any other person known to Allegiance to be
entitled to registration rights under this Section 9, in each case, by promptly
mailing the same, postage prepaid, to the address of record of the persons
entitled to receive such copies.

                  10. Listing.

                  If Allegiance Common Stock or any other securities to be
acquired upon exercise of the Option are then-listed on the NYSE or any other
national securities exchange, Allegiance, upon the request of Cardinal, will
promptly file an application to list the shares of Allegiance Common Stock or
other securities to be acquired upon exercise of the Option on the NYSE or such
other exchange and will use its best efforts to obtain approval of such listings
as soon as practicable.

                  11. Severability.

                  Any term, provision, covenant or restriction contained in this
Option Agreement held by a court or other Governmental Authority of competent
jurisdiction to be invalid, void or unenforceable, shall be ineffective to the
extent of such invalidity, voidness or unenforceability, but neither the
remaining terms, provisions, covenants or restrictions contained in this Option
Agreement nor the validity or enforceability thereof in any other jurisdiction
shall be affected or impaired thereby. Any term, provision, covenant or
restriction contained in this Option 


                                      -8-
<PAGE>

Agreement that is so found to be so broad as to be unenforceable shall be
interpreted to be as broad as is enforceable.

                  12. Miscellaneous.

                  (a) Expenses. Each of the parties hereto shall pay all costs
and expenses incurred by it or on its behalf in connection with the transactions
contemplated hereunder, including fees and expenses of its own financial
consultants, investment bankers, accountants and counsel.

                  (b) Entire Agreement. This Option Agreement, the Support
Agreements, the Merger Agreement (including the documents and the instruments
referred to therein) and the Confidentiality Agreement constitute the entire
agreement among the parties and supersede all prior agreements and
understandings, agreements or representations by or among the parties, written
and oral, with respect to the subject matter hereof and thereof.

                  (c) Successors; No Third-Party Beneficiaries. The terms and
conditions of this Option Agreement shall inure to the benefit of and be binding
upon the parties hereto and their respective successors and permitted assigns.
Nothing in this Option Agreement, expressed or implied, is intended to confer
upon any party, other than the parties hereto, and their respective successors
and assigns, any rights, remedies, obligations, or liabilities under or by
reason of this Option Agreement, except as expressly provided herein.

                  (d) Notices. All notices or other communications that are
required or permitted hereunder shall be in writing and sufficient if delivered
in accordance with Section 8.2 of the Merger Agreement (which is incorporated
herein by reference).

                  (e) Counterparts. This Option Agreement may be executed in
counterparts, and each such counterpart shall be deemed to be an original
instrument, but both such counterparts together shall constitute but one
agreement.

                  (f) Further Assurances. In the event of any exercise of the
Option by Cardinal, Allegiance and Cardinal shall execute and deliver all other
documents and instruments and take all other action that may be reasonably
necessary in order to consummate the transactions provided for by such exercise.

                  (g) Specific Performance. The parties hereto agree that if for
any reason Cardinal or Allegiance shall have failed to perform its obligations
under this Option Agreement, then either party hereto seeking to enforce this
Option Agreement against such non-performing party shall be entitled to specific
performance and injunctive and other equitable relief, and the parties hereto
further agree to waive any requirement for the securing or posting of any bond
in connection with the obtaining of any such injunctive or other equitable
relief. This provision is without prejudice to any other rights that either
party hereto may have against the other party hereto for any failure to perform
its obligations under this Option Agreement.

                                      -9-
<PAGE>

                  (h) Governing Law. Except to the extent that the laws of the
jurisdiction of organization of any party hereto, or any other jurisdiction, are
mandatorily applicable to matters arising under or in connection with this
Option Agreement, this Option Agreement shall be governed by the laws of the
State of Delaware. All actions and proceedings arising out of or relating to
this Option Agreement shall be heard and determined in any Delaware state or
federal court sitting in the City of Wilmington, Delaware.

                  (i) Consent to Jurisdiction; Venue.

                  (i) Each of the parties hereto irrevocably submits to the
         exclusive jurisdiction of the state courts of Delaware and to the
         jurisdiction of the United States District Court for the District of
         Delaware, for the purpose of any action or proceeding arising out of or
         relating to this Option Agreement and each of the parties hereto
         irrevocably agrees that all claims in respect to such action or
         proceeding may be heard and determined exclusively in any Delaware
         state or federal court sitting in the City of Wilmington, Delaware.
         Each of the parties hereto agrees that a final judgment in any action
         or proceeding shall be conclusive and may be enforced in other
         jurisdictions by suit on the judgment or in any other manner provided
         by law.

                  (ii) Each of the parties hereto irrevocably consents to the
         service of any summons and complaint and any other process in any other
         action or proceeding relating hereto, on behalf of itself or its
         property, by the personal delivery of copies of such process to such
         party. Nothing in this Section 12(i) shall affect the right of any
         party hereto to serve legal process in any other manner permitted by
         law.

                  (j) Regulatory Approvals; Section 16(b). If, in connection
with the exercise of the Option under Section 3 hereof, prior notification to or
approval of any Governmental Authority is required, then the required notice or
application for approval shall be promptly filed and/or expeditiously processed
by Allegiance, and periods of time that otherwise would run pursuant hereto (if
any) shall run instead from the date on which any such required notification
period has expired or been terminated or such approval has been obtained, and in
either event, any requisite waiting period shall have passed. Cardinal shall use
reasonable efforts to cooperate with Allegiance in giving any such prior
notification or obtaining any such approval of any Government Authority. Periods
of time that otherwise would run pursuant to Section 3, 7 or 8 hereof shall also
be extended to the extent necessary to avoid liability under Section 16(b) of
the Exchange Act.

                  (k) Waiver and Amendment. Any provision of this Option
Agreement may be waived at any time by the party that is entitled to the
benefits of such provision. This Option Agreement may not be modified, amended,
altered or supplemented except upon the execution and delivery of a written
agreement executed by the parties hereto.



                                      -10-
<PAGE>



                  IN WITNESS WHEREOF, each of the parties hereto has executed
this Option Agreement as of the date first written above.


                                       CARDINAL HEALTH, INC.



                                       By:/s/Robert D. Walter
                                          -------------------------------
                                          Name:  Robert D. Walter
                                          Title:



                                       ALLEGIANCE CORPORATION


                                       By:/s/ Lester B. Knight
                                          -------------------------------
                                          Name:  Lester B. Knight
                                          Title:






                                      -11-

                                                                    EXHIBIT 3.1
                            Support/Voting Agreement



                                                     October 8, 1998


Cardinal Health, Inc.
5555 Glendon Court
Dublin, Ohio  43016

                  Re:      Support/Voting Agreement

Dear Sirs:

                  The undersigned understands that Cardinal Health, Inc.
("Cardinal"), Boxes Merger Corp., a wholly owned subsidiary of Cardinal
("Subcorp"), and Allegiance Corporation ("Allegiance") are entering into an
Agreement and Plan of Merger, dated the date hereof (the "Agreement"), providing
for, among other things, a merger between Subcorp and Allegiance (the "Merger")
in which all of the outstanding shares of capital stock of Allegiance will be
exchanged for common shares, without par value, of Cardinal.

                  The undersigned is a stockholder of Allegiance (the
"Stockholder") and is entering into this letter agreement to induce you to enter
into the Agreement and to consummate the transactions contemplated thereby.

                  The Stockholder confirms its agreement with you as follows:


                  1. The Stockholder represents, warrants and agrees that
Schedule I annexed hereto sets forth the shares of the capital stock of
Allegiance of which the Stockholder or any of its controlled affiliates (its
"Controlled Affiliates"; "controlled" and "affiliate" as defined under the
Securities Exchange Act of 1934, as amended) is the record or beneficial owner
(the "Shares") and that the Stockholder and its Controlled Affiliates are on the
date hereof the lawful owners of the number of Shares set forth in Schedule I,
free and clear of all liens, charges, encumbrances, voting agreements and
commitments of every kind, except as disclosed in Schedule I. Except for the
Shares set forth in Schedule I, neither the Stockholder nor any of its
Controlled Affiliates own or hold any rights to acquire any additional shares of
the capital stock of Allegiance (other than pursuant to Allegiance Options) or
any interest therein or any voting rights with respect to any additional shares.

                  2. The Stockholder agrees that it will not, will not permit
any company, trust or other entity controlled by the Stockholder to, and will
not permit any of its Controlled Affiliates to, contract to sell, sell or
otherwise transfer or dispose of any of the Shares or any interest therein or
securities convertible thereinto or any voting rights with respect thereto,
other than (i) 

<PAGE>

pursuant to the Merger, (ii) with your prior written consent, or (iii) to the
extent contractually required as of the time immediately preceding the execution
of this letter agreement, to the extent such contractual requirement is
disclosed in Schedule I.

                  3. The Stockholder agrees to, will cause any company, trust or
other entity controlled by the Stockholder to, and will cause its Controlled
Affiliates to, cooperate fully with you in connection with the Agreement and the
transactions contemplated thereby. The Stockholder agrees that, during the term
of this letter agreement, it will not, and will not permit any such company,
trust or other entity to, and will not permit any of its Controlled Affiliates
to, directly or indirectly (including through its directors, officers, employees
or other representatives), solicit, initiate, encourage or facilitate, or
furnish or disclose non-public information in furtherance of, any inquiries or
the making of any proposal with respect to any recapitalization, merger,
consolidation or other business combination involving Allegiance, or acquisition
of any capital stock (other than upon exercise of Allegiance Options that are
outstanding as of the date hereof) or 30% or more of the assets of Allegiance
and its subsidiaries, taken as a whole, in a single transaction or a series of
related transactions, or any acquisition by Allegiance of any material assets or
capital stock of any other person, or any combination of the foregoing (a
"Competing Transaction"), or negotiate, explore or otherwise engage in
discussions with any person (other than Cardinal, Subcorp or their respective
directors, officers, employees, agents and representatives) with respect to any
Competing Transaction or enter into any agreement, arrangement or understanding
with respect to any Competing Transaction or agree to or otherwise assist in the
effectuation of any Competing Transaction; provided, however, that nothing
herein shall prevent the Stockholder from taking any action, after having
notified Cardinal thereof, or omitting to take any action solely as a member of
the Board of Directors of Allegiance required so as not to violate such
Stockholder's fiduciary obligations as a director of Allegiance after
consultation with outside counsel.

                  4. The Stockholder agrees that all of the Shares beneficially
owned by the Stockholder or its Controlled Affiliates (except, in each case,
Shares subject to unexercised Allegiance Options), or over which the Stockholder
or any of its Controlled Affiliates has voting power or control, directly or
indirectly (including any common shares of Allegiance acquired after the date
hereof), at the record date for any meeting of stockholders of Allegiance called
to consider and vote to approve the Merger and the Agreement and/or the
transactions contemplated thereby and/or any Competing Transaction will be voted
by the Stockholder or its Controlled Affiliates in favor of the Merger and the
Agreement and the transactions contemplated thereby and that neither the
Stockholder nor any of its Controlled Affiliates will vote such Shares in favor
of any Competing Transaction during the term of this letter agreement.

                  5. The Stockholder has all necessary power and authority to
enter into this letter agreement. This letter agreement is the legal, valid and
binding agreement of the Stockholder, and is enforceable against the Stockholder
in accordance with its terms.

                  6. The Stockholder agrees that damages are an inadequate
remedy for the breach by the Stockholder of any term or condition of this letter
agreement and that you shall be 

                                      -2-
<PAGE>

entitled to a temporary restraining order and preliminary and permanent
injunctive relief in order to enforce our agreements herein.

                  7. Except to the extent that the laws of the jurisdiction of
organization of any party hereto, or any other jurisdiction, are mandatorily
applicable to matters arising under or in connection with this letter agreement,
this letter agreement shall be governed by the laws of the State of Delaware.
All actions and proceedings arising out of or relating to this letter agreement
shall be heard and determined in any Delaware state or federal court sitting in
the City of Wilmington, Delaware.

                  8. Each of the parties hereto irrevocably submits to the
exclusive jurisdiction of the state courts of Delaware and to the jurisdiction
of the United States District Court for the District of Delaware for the purpose
of any action or proceeding arising out of or relating to this letter agreement
and each of the parties hereto irrevocably agrees that all claims in respect to
such action or proceeding may be heard and determined exclusively in any
Delaware state or federal court sitting in the City of Wilmington, Delaware.
Each of the parties hereto agrees that a final judgment in any action or
proceeding shall be conclusive and may be enforced in other jurisdictions by
suit on the judgment or in any other manner provided by law. Each of the parties
hereto irrevocably consents to the service of any summons and complaint and any
other process in any other action or proceeding relating hereto, on behalf of
itself or its property, by the personal delivery of copies of such process to
such party. Nothing in this Section 8 shall affect the right of any party hereto
to serve legal process in any other manner permitted by law.

                  9. This letter agreement constitutes the entire agreement
among the parties hereto with respect to the matters covered hereby and
supersedes all prior agreements, understandings or representations among the
parties written or oral, with respect to the subject matter hereof.

                  10. Capitalized terms not defined in this letter agreement
shall have the meaning assigned to them in the Agreement.











                                      -3-
<PAGE>



                  This letter agreement may be terminated at the option of any
party at any time upon the earlier of (i) the date on which the Agreement is
terminated and (ii) the Effective Time. Please confirm that the foregoing
correctly states the understanding between us by signing and returning to me a
counterpart hereof.


                                             Very truly yours,



                                             By:/s/ Lester B. Knight
                                                -------------------------------
                                                Name: Lester B. Knight

Confirmed on the date 
first above written.

CARDINAL HEALTH, INC.



By:/s/ Robert D. Walter
   ----------------------------------
   Name:  Robert D. Walter
   Title:










                                      -4-
<PAGE>

                                                                      SCHEDULE I
                                                                      ----------
                                                                 STOCK OWNERSHIP
                                                             OF LESTER B. KNIGHT
                                                        SUPPORT/VOTING AGREEMENT
                                                        ------------------------


As of September 30, 1998

Owned Beneficially (including BOXES Options):                   1,667,298 shares

Owned of Record:                                               362,031.88 shares






                                                                    EXHIBIT 3.2
                            Support/Voting Agreement



                                                     October 8, 1998


Cardinal Health, Inc.
5555 Glendon Court
Dublin, Ohio  43016

                  Re:      Support/Voting Agreement

Dear Sirs:

                  The undersigned understands that Cardinal Health, Inc.
("Cardinal"), Boxes Merger Corp., a wholly owned subsidiary of Cardinal
("Subcorp"), and Allegiance Corporation ("Allegiance") are entering into an
Agreement and Plan of Merger, dated the date hereof (the "Agreement"), providing
for, among other things, a merger between Subcorp and Allegiance (the "Merger")
in which all of the outstanding shares of capital stock of Allegiance will be
exchanged for common shares, without par value, of Cardinal.

                  The undersigned is a stockholder of Allegiance (the
"Stockholder") and is entering into this letter agreement to induce you to enter
into the Agreement and to consummate the transactions contemplated thereby.

                  The Stockholder confirms its agreement with you as follows:


                  1. The Stockholder represents, warrants and agrees that
Schedule I annexed hereto sets forth the shares of the capital stock of
Allegiance of which the Stockholder or any of its controlled affiliates (its
"Controlled Affiliates"; "controlled" and "affiliate" as defined under the
Securities Exchange Act of 1934, as amended) is the record or beneficial owner
(the "Shares") and that the Stockholder and its Controlled Affiliates are on the
date hereof the lawful owners of the number of Shares set forth in Schedule I,
free and clear of all liens, charges, encumbrances, voting agreements and
commitments of every kind, except as disclosed in Schedule I. Except for the
Shares set forth in Schedule I, neither the Stockholder nor any of its
Controlled Affiliates own or hold any rights to acquire any additional shares of
the capital stock of Allegiance (other than pursuant to Allegiance Options) or
any interest therein or any voting rights with respect to any additional shares.

                  2. The Stockholder agrees that it will not, will not permit
any company, trust or other entity controlled by the Stockholder to, and will
not permit any of its Controlled Affiliates to, contract to sell, sell or
otherwise transfer or dispose of any of the Shares or any interest therein or
securities convertible thereinto or any voting rights with respect thereto,
other than (i) 

<PAGE>

pursuant to the Merger, (ii) with your prior written consent, or (iii) to the
extent contractually required as of the time immediately preceding the execution
of this letter agreement, to the extent such contractual requirement is
disclosed in Schedule I.

                  3. The Stockholder agrees to, will cause any company, trust or
other entity controlled by the Stockholder to, and will cause its Controlled
Affiliates to, cooperate fully with you in connection with the Agreement and the
transactions contemplated thereby. The Stockholder agrees that, during the term
of this letter agreement, it will not, and will not permit any such company,
trust or other entity to, and will not permit any of its Controlled Affiliates
to, directly or indirectly (including through its directors, officers, employees
or other representatives), solicit, initiate, encourage or facilitate, or
furnish or disclose non-public information in furtherance of, any inquiries or
the making of any proposal with respect to any recapitalization, merger,
consolidation or other business combination involving Allegiance, or acquisition
of any capital stock (other than upon exercise of Allegiance Options that are
outstanding as of the date hereof) or 30% or more of the assets of Allegiance
and its subsidiaries, taken as a whole, in a single transaction or a series of
related transactions, or any acquisition by Allegiance of any material assets or
capital stock of any other person, or any combination of the foregoing (a
"Competing Transaction"), or negotiate, explore or otherwise engage in
discussions with any person (other than Cardinal, Subcorp or their respective
directors, officers, employees, agents and representatives) with respect to any
Competing Transaction or enter into any agreement, arrangement or understanding
with respect to any Competing Transaction or agree to or otherwise assist in the
effectuation of any Competing Transaction; provided, however, that nothing
herein shall prevent the Stockholder from taking any action, after having
notified Cardinal thereof, or omitting to take any action solely as a member of
the Board of Directors of Allegiance required so as not to violate such
Stockholder's fiduciary obligations as a director of Allegiance after
consultation with outside counsel.

                  4. The Stockholder agrees that all of the Shares beneficially
owned by the Stockholder or its Controlled Affiliates (except, in each case,
Shares subject to unexercised Allegiance Options), or over which the Stockholder
or any of its Controlled Affiliates has voting power or control, directly or
indirectly (including any common shares of Allegiance acquired after the date
hereof), at the record date for any meeting of stockholders of Allegiance called
to consider and vote to approve the Merger and the Agreement and/or the
transactions contemplated thereby and/or any Competing Transaction will be voted
by the Stockholder or its Controlled Affiliates in favor of the Merger and the
Agreement and the transactions contemplated thereby and that neither the
Stockholder nor any of its Controlled Affiliates will vote such Shares in favor
of any Competing Transaction during the term of this letter agreement.

                  5. The Stockholder has all necessary power and authority to
enter into this letter agreement. This letter agreement is the legal, valid and
binding agreement of the Stockholder, and is enforceable against the Stockholder
in accordance with its terms.

                  6. The Stockholder agrees that damages are an inadequate
remedy for the breach by the Stockholder of any term or condition of this letter
agreement and that you shall be 

                                      -2-
<PAGE>

entitled to a temporary restraining order and preliminary and permanent
injunctive relief in order to enforce our agreements herein.

                  7. Except to the extent that the laws of the jurisdiction of
organization of any party hereto, or any other jurisdiction, are mandatorily
applicable to matters arising under or in connection with this letter agreement,
this letter agreement shall be governed by the laws of the State of Delaware.
All actions and proceedings arising out of or relating to this letter agreement
shall be heard and determined in any Delaware state or federal court sitting in
the City of Wilmington, Delaware.

                  8. Each of the parties hereto irrevocably submits to the
exclusive jurisdiction of the state courts of Delaware and to the jurisdiction
of the United States District Court for the District of Delaware for the purpose
of any action or proceeding arising out of or relating to this letter agreement
and each of the parties hereto irrevocably agrees that all claims in respect to
such action or proceeding may be heard and determined exclusively in any
Delaware state or federal court sitting in the City of Wilmington, Delaware.
Each of the parties hereto agrees that a final judgment in any action or
proceeding shall be conclusive and may be enforced in other jurisdictions by
suit on the judgment or in any other manner provided by law. Each of the parties
hereto irrevocably consents to the service of any summons and complaint and any
other process in any other action or proceeding relating hereto, on behalf of
itself or its property, by the personal delivery of copies of such process to
such party. Nothing in this Section 8 shall affect the right of any party hereto
to serve legal process in any other manner permitted by law.

                  9. This letter agreement constitutes the entire agreement
among the parties hereto with respect to the matters covered hereby and
supersedes all prior agreements, understandings or representations among the
parties written or oral, with respect to the subject matter hereof.

                  10. Capitalized terms not defined in this letter agreement
shall have the meaning assigned to them in the Agreement.











                                      -3-
<PAGE>



                  This letter agreement may be terminated at the option of any
party at any time upon the earlier of (i) the date on which the Agreement is
terminated and (ii) the Effective Time. Please confirm that the foregoing
correctly states the understanding between us by signing and returning to me a
counterpart hereof.


                                             Very truly yours,



                                             By:/s/ Joseph F. Damico
                                                -------------------------------
                                                Name: Joseph F. Damico

Confirmed on the date 
first above written.

CARDINAL HEALTH, INC.



By:/s/ Robert D. Walter
   ----------------------------------
   Name:  Robert D. Walter
   Title:










                                      -4-
<PAGE>

                                                                      SCHEDULE I
                                                                      ----------
                                                                 STOCK OWNERSHIP
                                                             OF JOSEPH F. DAMICO
                                                        SUPPORT/VOTING AGREEMENT
                                                        ------------------------


As of September 30, 1998

Owned Beneficially (including BOXES Options):                   1,066,744 shares

Owned of Record:                                                  265,807 shares







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