Document:

<PAGE>

                                                                   Exhibit 10.30

                               AMENDMENT NO. 2 TO
                             STOCKHOLDERS AGREEMENT

     AMENDMENT NO. 2 TO STOCKHOLDERS AGREEMENT (this "Amendment") dated as of
November 20, 2002 by and among Concentra Inc., a Delaware corporation formerly
known as Concentra Managed Care, Inc. (the "Company"), the several persons
signatory hereto and named on Schedule I hereto under the heading "Schedule I
Purchasers" and the several persons signatory hereto and named on Schedule II
hereto under the heading "FFC Purchasers". Capitalized terms used in this
Amendment which are not otherwise defined herein shall have the meanings
ascribed to them in the Stockholders Agreement referred to below.

                              W I T N E S S E T H:

     WHEREAS, the Company, the several persons named on Schedule I hereto under
the heading "Schedule I Purchasers" (the "Schedule I Purchasers") and the
several persons named on Schedule II hereto under the heading "FFC Purchasers"
(the "FFC Purchasers" and, together with the Schedule I Purchasers,
collectively, the "Stockholders") are parties to a Stockholders Agreement dated
as of August 17, 1999 (the "Stockholders Agreement");

     WHEREAS, on November 1, 2001, the Company issued to certain of its existing
shareholders an aggregate 2,266,546 shares of Company Common Stock and warrants
to acquire an aggregate 771,277 additional shares of Company Common Stock and,
in connection therewith, the Stockholders Agreement was amended by Amendment No.
1 thereto dated as of November 1, 2001 to provide for certain matters relating
to such shares and such warrants;

     WHEREAS, the Company proposes to issue an aggregate 1,515,152 shares of
Company Common Stock (the "New Common Shares") pursuant to the terms and
conditions of a Stock Purchase Agreement (the "Stock Purchase Agreement") dated
as of the date hereof among the Company and the purchasers named therein (the
"Purchasing Stockholders");

     WHEREAS, upon the issuance of the New Common Shares, each Stockholder will
own the number of shares of Company Common Stock, Company Class A Common Stock
and/or New Warrants, as the case may be, appearing opposite the name of such
Stockholder on Schedule I or Schedule II hereto, as the case may be;

     WHEREAS, it is a condition to the respective obligations of the Company and
the Purchasing Stockholders under the Stock Purchase Agreement that this
Amendment be executed and delivered by the Company and each of the Purchasing
Stockholders, including (i) holders of a majority in interest of the Company
Capital Stock currently held

                                       1

<PAGE>

by the Schedule I Purchasers and (ii) holders of a majority in interest of the
Company Capital Stock currently held by the FFC Purchasers; and

     WHEREAS, the parties hereto desire to execute and deliver this Amendment in
order to fulfill such condition and to provide for certain matters relating to
the New Common Shares;

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

     SECTION 1. Amendments to Stockholders Agreement. The Stockholders Agreement
is amended as follows:

          (a)   Section I (1) of the Stockholders Agreement is amended by
deleting the definition of New Common Shares appearing therein and adding the
following new definition in lieu thereof:

                "'New Common Shares' means the `New Common Shares' referred to
     in Amendment No. 1 to this Agreement dated as of November 1, 2001 and the
     `New Common Shares' referred to in Amendment No. 2 to this Agreement dated
     as of November 20, 2002."

          (b)   Section VIII (1) of the Stockholders Agreement is amended by
deleting the text "held by such Stockholder as of the Effective Date" appearing
in the introductory clause thereof and inserting the text "held by such
Stockholder as of November 20, 2002" (the "Second Amendment Effective Date")" in
lieu thereof.

          (c)   Section VIII (1) of the Stockholders Agreement is amended by
deleting the text "held by such Stockholder on the date hereof" appearing in the
proviso at the end of said Section and inserting the text "held by such
Stockholder on the Second Amendment Effective Date" in lieu thereof.

          (d)   Section IX of the Stockholders Agreement is amended by deleting
the text "held by the Schedule I Purchasers on the Effective Date" appearing
therein and inserting the text "held by the Schedule I Purchasers on the Second
Amendment Effective Date" in lieu thereof.

          (e)   All references to "FFT" or to the "FFT Purchasers" contained in
the Stockholders Agreement shall be deleted and replaced by references to "FFC"
or to the "FFC Purchasers", as applicable.

     SECTION 2. Miscellaneous.

          (a) This Amendment shall be governed by and construed in accordance
with the laws of the State of New York.

                                       2

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         (b) This Amendment may be executed in two or more counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

         (c) Headings and section reference numbers in this Amendment are for
reference purposes only and shall not in any way affect the meaning or
interpretation of this Amendment.

         (d) This Amendment is limited precisely as written and shall not be
deemed to be a modification, acceptance or waiver of any other term, condition
or provision of the Stockholders Agreement.

     IN WITNESS WHEREOF, each of the parties hereto has executed this Amendment
No. 2 to Stockholders Agreement, all as of the day and year first above written.

                                      CONCENTRA INC.

                                      By:      /s/ Richard A. Parr II
                                               -----------------------
                                               Richard A. Parr II
                                               Executive Vice President,
                                               General Counsel and Secretary

                       [PURCHASER SIGNATURE PAGES FOLLOW]

                                       3

<PAGE>

Address for Notices:                  The Purchasers:
-------------------                   --------------

c/o Welsh, Carson, Anderson & Stowe   WELSH, CARSON, ANDERSON & STOWE VIII, L.P.
320 Park Avenue                       By:  WCAS VIII Associates, L.L.C.,
Suite 2500                                 General Partner
         New York, NY 10022
Attention: Jonathan Rather            By:    /s/ Jonathan M. Rather
Facsimile: (212) 893-9548                ---------------------------------------
                                           Managing Member

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

                                      By:    /s/ Jonathan M. Rather
                                         ---------------------------------------
                                           Jonathan M. Rather
                                           Attorney-in-Fact

                                      WCAS MANAGEMENT CORP.

                                      By:    /s/ Jonathan M. Rather
                                         ---------------------------------------
                                           Jonathan M. Rather
                                           Treasurer

                                      John Almeida, Jr.
                                      Bruce K. Anderson
                                      David F. Bellet
                                      Russell L. Carson
                                      Anthony J. deNicola
                                      James B. Hoover
                                      D. Scott Mackesy
                                      Thomas E. McInerney
                                      Robert A. Minicucci
                                      Priscilla A. Newman
                                      Andrew M. Paul
                                      Paul B. Queally
                                      Jonathan M. Rather
                                      Richard H. Stowe
                                      Sean M. Traynor
                                      Laura M. VanBuren
                                      Patrick J. Welsh

                                      By:    /s/ Jonathan M. Rather
                                         ---------------------------------------
                                            Jonathan M. Rather, Individually and
                                            as Attorney- in-Fact

<PAGE>

                                             /s/ James D. Hann
                                         ---------------------------------------
                                           James D. Hann

                                            /s/ William G. Payne
                                         ---------------------------------------
                                           William G. Payne

                                           /s/ Kurt Anderson
                                         ---------------------------------------
                                           Kurt Anderson

                                           /s/ Arthur Canario, M.D.
                                         ---------------------------------------
                                           Arthur Canario, M.D.

                                           /s/ David Cardelle
                                         ---------------------------------------
                                           David Cardelle

                                           /s/ James Doody
                                         ---------------------------------------
                                           James Doody

                                           /s/ Steven E. Nelson
                                         ---------------------------------------
                                           Steven E. Nelson

                                           /s/ Robert Seeds
                                         ---------------------------------------
                                           Robert Seeds

                                           /s/ Timothy Smith
                                         ---------------------------------------
                                           Timothy Smith

<PAGE>

c/o Leeway & Co. (AT&T)             J.P. MORGAN DIRECT CORPORATE FINANCE
J.P. Morgan Investment Management   INSTITUTIONAL INVESTORS LLC
522 5/th/ Avenue, 13/th/ Floor
New York, NY 10036
Attention: Robert Kiss              By:  /s/ Robert E. Kiss
Facsimile: 212-837-1301                -----------------------------------------
                                         Name:  Robert E. Kiss
                                         Title: Portfolio Manager

                                    J.P. MORGAN DIRECT CORPORATE FINANCE PRIVATE
                                    INVESTORS LLC

                                    By:  /s/ Robert E. Kiss
                                       -----------------------------------------
                                         Name:  Robert E. Kiss
                                         Title: Portfolio Manager

                                    522 FIFTH AVENUE FUND, L.P.

                                    By:  /s/ Robert E. Kiss
                                       -----------------------------------------
                                         Name:  Robert E. Kiss
                                         Title: Portfolio Manager

<PAGE>

c/o CMS Companies               CMS PEP XIV CO-INVESTMENT SUBPARTNERSHIP
1926 Arch Street
Philadelphia, PA 19103
Attention: Rick Mitchell
Facsimile: (215) 246-3083

                                 By: /s/ Richard A. Mitchell
                                   ---------------------------------------------
                                     Richard A. Mitchell
                                     Authorized Representative

                                 CMS CO-INVESTMENT SUBPARTNERSHIP II

                                 By: /s/ Richard A. Mitchell
                                   ---------------------------------------------
                                     Richard A. Mitchell
                                     Authorized Representative

                                 CMS DIVERSIFIED PARTNERS, L.P.

                                 By: /s/ Richard A. Mitchell
                                    --------------------------------------------
                                     Richard A. Mitchell
                                     Authorized Representative

<PAGE>

c/o Hamilton Lane                  HAMILTON LANE PRIVATE EQUITY PARTNERS, L.P.
GSB Building
One Belmont Avenue, 9/th/ Floor    By:  HLSP Investment Management, LLC,
Bala Cynwyd, PA 19042                   its General Partner
Attention: Bradley Atkins
Facsimile: (610) 617-9853          By:  Hamilton Lane Investment Holdings, L.L.C

                                   By:  Hamilton Lane Advisors, L.L.C.

                                   By:      /s/ Mario L. Giannini
                                        ---------------------------------------
                                            Mario L. Giannini
                                            CEO

                                   HAMILTON LANE PRIVATE EQUITY FUND, PLC

                                   By:      /s/ Mario L. Giannini
                                        ---------------------------------------
                                                Mario L. Giannini
                                                Director

                                   By:      /s/ Leslie A. Brun
                                        ---------------------------------------
                                                Leslie A. Brun
                                                Director

<PAGE>

c/o Nassau Capital Funds, L.P.        NASSAU CAPITAL PARTNERS III L.P.
22 Chambers Street, 2/nd/ Floor
Princeton, NJ 08542
Attention: Jeffrey Tuder              By: /s/ Robert Honstein
                                         --------------------------------------
Facsimile: (609) 924-8887                   Name:
                                            Title:

                                      NASSAU CAPITAL PARTNERS IV, L.P.

                                      By: /s/ Robert Honstein
                                         --------------------------------------
                                            Name:
                                            Title:

                                      NAS PARTNERS LLC

                                      By: /s/ Robert Honstein
                                         --------------------------------------
                                            Name:
                                            Title:

<PAGE>

c/o Portfolio Advisors, LLC         A.S.F. CO-INVESTMENT PARTNERS, L.P.
9 Old Kings Highway South           By: PAF 10/98, LLC
Darien, CT 06820                    By: Old Kings I, LLC, as Managing Member
Attention: Jonathan Murphy
Facsimile: (203) 662-0013

                                    By: /s/ Jonathan F. Murphy
                                       ---------------------------------------
                                        Name:  Jonathan F. Murphy
                                        Title: Managing Member

<PAGE>

51 Madison Avenue, Suite 3009   NEW YORK LIFE CAPITAL PARTNERS, L.P.
New York, NY 10010              By:  NYLCAP Manager LLC, its Investment Manager
Attention: Steven Benevento
Facsimile: (212) 576-5591

                                By:   /s/ Steven Benevento
                                   ---------------------------------------------
                                    Name:  Steven Benevento
                                    Title:

<PAGE>

                                FERRER FREEMAN & COMPANY, LLC

                                on behalf of FFC PARTNERS I, L.P.
                                and as its General Partner

                                By:     /s/ Carlos A. Ferrer
                                   ---------------------------------------------
                                        Carlos A. Ferrer
                                        Manager

                                   and

                                on behalf of FFC EXECUTIVE PARTNERS I,
                                L.P. and as its General Partner

                                By: /s/ Carlos A. Ferrer
                                   ---------------------------------------------
                                        Carlos A. Ferrer
                                        Manager

                                   and

                                on behalf of FFC PARTNERS II, L.P.
                                and as its General Partner

                                By: /s/ Carlos A. Ferrer
                                   ---------------------------------------------
                                        Carlos A. Ferrer
                                        Manager

<PAGE>

                                                                      SCHEDULE I

                              Schedule I Purchasers

                                  See attached.

Address for Schedule I Purchasers:

c/o      Welsh, Carson, Anderson & Stowe
         320 Park Avenue, Suite 2500
         New York, New York 10022
         Attention: Paul B. Queally
         Telecopy: (212) 893-9566

<PAGE>

                                                                     SCHEDULE II

                                 FFC Purchasers

                                  See attached.

Address for FFC Purchasers:

c/o   Ferrer Freeman & Co.
         The Mill
         10 Glenville Street
         Greenwich, Connecticut  06831
         Attention:  Carlos Ferrer
         Telecopy:  (203) 532-8016<PAGE>

                                                                   Exhibit 10.31

                    AMENDMENT NO. 3 TO STOCKHOLDERS AGREEMENT

     This Amendment No. 3 to Stockholders Agreement (this "Amendment"), dated as
of December 1, 2002, by Concentra Inc., a Delaware corporation formerly known as
Concentra Managed Care, Inc. (the "Company"), and a majority in interest of each
of the Schedule I Purchasers and FFC Purchasers (each as hereinafter defined).
Capitalized terms used in this Amendment which are not otherwise defined herein
shall have the respective meanings assigned to them in the Stockholders
Agreement referred to below.

                                   WITNESSETH:

     WHEREAS, the Company is party to a certain Stockholders Agreement dated as
of August 17, 1999 (as amended, the "Stockholders Agreement"), together with the
several persons named on Schedule I thereto under the heading "Schedule I
Purchasers" (the "Schedule I Purchasers"), and the several persons named on
Schedule II thereto under the heading "FFC Purchasers" (the "FFC Purchasers"
and, together with the Schedule I Purchasers, collectively, the "Purchasers");
and

     WHEREAS, on November 1, 2001, the Company issued to certain of its existing
shareholders an aggregate 2,266,546 shares of Company Common Stock and warrants
to acquire an aggregate 771,277 additional shares of Company Common Stock and,
in connection therewith, the Stockholders Agreement was amended by Amendment No.
1 thereto dated as of November 1, 2001, to provide for certain matters relating
to such shares and such warrants; and

     WHEREAS, on November 20, 2002, the Company issued to certain of its
existing shareholders an aggregate 1,515,152 shares of Company Common Stock and,
in connection therewith, the Stockholders Agreement was amended by Amendment No.
2 thereto dated as of November 20, 2002, to provide for certain matters relating
to such shares; and

     WHEREAS, in connection with the Company's December 1, 2002, acquisition of
Em3 Corporation ("Em3"), the Company issued an aggregate 1,826,956 shares of
Company Common Stock to certain of its existing shareholders and to certain
former shareholders of Em3 who were not already shareholders of the Company, and
the Company wishes to afford to such new shareholders the opportunity to become
parties to the Stockholders Agreement as set forth herein; and

     WHEREAS, pursuant to Section XIII.(6) thereof, the Stockholders Agreement
can be amended as set forth in this Amendment by approval of the Company and
affirmative vote of a majority in interest of each of the Schedule I Purchasers
and FFC Purchasers;

     NOW, THEREFORE, in consideration of the foregoing and the mutual agreements
and covenants set forth herein and other good and valuable consideration, the
parties hereto agree as follows:

     1.   Amendment to Stockholders Agreement. Schedule I to the Stockholders
Agreement is hereby amended to include each of the persons set forth in Exhibit
A hereto

                                       1

<PAGE>

                                                                   Exhibit 10.32

"Joining Persons"), upon such Joining Persons' execution and delivery of a
Joinder Agreement substantially in the form attached hereto as Exhibit B.

     2.  Miscellaneous.

        (a) This Amendment shall be governed by and construed in accordance with
the laws of the State of New York.

        (b) This Amendment may be executed in two or more counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

        (c) Headings and section reference numbers in this Amendment are for
reference purposes only and shall not in any way affect the meaning or
interpretation of this Amendment.

        (d) This Amendment is limited precisely as written and shall not be
deemed to be a modification, acceptance or waiver of any other term, condition
or provision of the Stockholders Agreement.

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

                                    CONCENTRA  INC.

                                    By: /s/ Richard A. Parr II
                                       ---------------------------------
                                        Richard A. Parr II
                                        Executive Vice President

         [Schedule I Purchaser and FFC Purchaser Signature Page Follows]

                                       2

<PAGE>

                                                                   Exhibit 10.32

Schedule I Purchasers:     WELSH, CARSON, ANDERSON & STOWE VIII, L.P.
                           By:   WCAS VIII Associates, L.L.C.,
                                 General Partner

                           By:   /s/ Jonathan M. Rather
                               --------------------------------------------
                                 Managing Member

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

                           By:   /s/ Jonathan M. Rather
                               --------------------------------------------
                                 Jonathan M. Rather
                                 Attorney-in-Fact

FFC Purchasers:            FERRER FREEMAN & COMPANY, LLC
                           on behalf of FFC PARTNERS I, L.P.
                           and as its General Partner

                           By:   /s/ Carlos A. Ferrer
                              ---------------------------------------------
                                 Carlos A. Ferrer
                                 Manager

                                                  and

                           on behalf of FFC EXECUTIVE PARTNERS I, L.P.
                           and as its General Partner

                           By:   /s/ Carlos A. Ferrer
                               --------------------------------------------
                                 Carlos A. Ferrer
                                 Manager

                                                  and

                           on behalf of FFC PARTNERS II, L.P.
                           and as its General Partner

                           By:   /s/ Carlos A. Ferrer
                               --------------------------------------------
                                 Carlos A. Ferrer
                                 Manager

                                       3

<PAGE>

                                                                   Exhibit 10.32

                                    EXHIBIT A

                                 Joining Parties

Michael Correia

Gary Zigenfus

William R. Winton

Eric Lee

Curtis J. Hoffman

Trudy Rios

Elijah C. Marentette

John K. Carlyle

Ken Wilkinson

Michael T. Fricke

Michael S. McCord

Kristan A. Covey

Ben Morgan

Geneva M. Giang

Mary P. Nixon

                                       A-1

<PAGE>

                                                                   Exhibit 10.32
                                    EXHIBIT B

                            Form of Joinder Agreement

                                JOINDER AGREEMENT

         This Joinder Agreement (the "Joinder") to the Amendment No. 3 to
Stockholders Agreement, dated as of August 17, 1999 (as amended, the
"Stockholders Agreement"), among Concentra Inc. (f/k/a Concentra Managed Care,
Inc.), a Delaware corporation ("Concentra"), and the several persons named in
Schedules I and II thereto, is executed and delivered by ________________ (the
"Joining Party") as of December 1, 2002. Each capitalized term used but not
otherwise defined herein shall have the meaning set forth in the Stockholders
Agreement.

         1. Agreement to be Bound. The Joining Party hereby agrees to be bound
by all of the terms of the Stockholders Agreement, attached to this Joinder as
Exhibit A (as the same may be hereafter amended, restated, or otherwise modified
from time to time). The Joining Party shall hereafter be deemed to be a
"Schedule I Purchaser" and a "Purchaser" for all purposes under the Stockholders
Agreement.

         2. Concentra Representations and Warranties. Each of the
representations and warranties of Concentra set forth in the Stockholders
Agreement is true and correct in all material respects as of the date hereof
with the same effect as though such representation and warranty had been made on
and as of this date.

         3. Joining Party Representations and Warranties. Each of the
representations and warranties of the Joining Party set forth in the
Stockholders Agreement is true and correct in all material respects as of the
date hereof with the same effect as though such representation and warranty had
been made on and as of this date.

         4. Notices. For purposes of notices and other communications to be
delivered to the Joining Party, the addresses and facsimile numbers set forth
below shall be deemed an amendment to Schedule I of the Stockholders Agreement
with respect to the Joining Party.

         5. Governing Law. This Joinder Agreement shall be governed by and
construed in accordance with the laws of the State of New York.

AGREED AND ACCEPTED:                   _________________________________________
                                          Signature of Joining Party

CONCENTRA INC.
                                      Print Name:_______________________________

By:_________________________          Address: _________________________________
    Richard A. Parr II
    Executive Vice President                   _________________________________

                                      Facsimile No:_____________________________

                                       B-1

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