Document:

<PAGE>   1
                                                                EXHIBIT 10.60.2

                                                               [CONFORMED COPY]

                       AMENDMENT NO. 2 TO CREDIT AGREEMENT

         AMENDMENT dated as of December 31, 1999 to the Credit Agreement dated
as of September 8, 1999 (as amended, the "CREDIT AGREEMENT") among WILLIAMS
COMMUNICATIONS, INC. (the "BORROWER"), WILLIAMS COMMUNICATIONS GROUP, INC., as
Guarantor, the LENDERS party thereto (the "LENDERS") and BANK OF AMERICA, N.A.,
as Administrative Agent (the "ADMINISTRATIVE AGENT"), THE CHASE MANHATTAN BANK,
as Syndication Agent, and BANK OF MONTREAL and THE BANK OF NEW YORK, as
Co-Documentation Agents.

                                  WITNESSETH:

         WHEREAS, the parties hereto have entered into the Credit Agreement and
now desire to make certain amendments to the Credit Agreement as set forth
herein;

         NOW, THEREFORE, the parties hereto agree as follows:

         SECTION 1. Defined Terms; References. Unless otherwise specifically
defined herein, each term used herein which is defined in the Credit Agreement
has the meaning assigned to such term in the Credit Agreement. Each reference to
"hereof", "hereunder", "herein" and "hereby" and each other similar reference
and each reference to "this Agreement" and each other similar reference
contained in the Credit Agreement shall, after this Amendment becomes effective,
refer to the Credit Agreement as amended hereby.

         SECTION 2. Additional Definitions. (a) Section 1.01(a) of the Credit
Agreement is hereby amended by inserting the following new defined terms in
appropriate alphabetical order:

                  "Permitted Specified Security Hedging Transactions" means
         options, collars, forwards and other similar transactions with respect
         to any Specified Security entered into by the Borrower or any of its
         Subsidiaries to hedge against changes in the market price of such
         Specified Security.

                  "Specified Security" means publicly traded equity securities
         of actual or prospective customers or vendors of the Borrower and its
         Subsidiaries acquired by the Borrower and its Subsidiaries in
         connection with (or pursuant to warrants, options or rights acquired in
         connection with) commercial agreements with such customers or vendors;
         provided

<PAGE>   2

         that securities of the Borrower or any of its Subsidiaries or
         Affiliates shall not constitute Specified Securities.

         SECTION 3. Indebtedness; Certain Equity Securities. (a) Section 6.01 of
the Credit Agreement is hereby amended by inserting, immediately following
clause (p) thereof, new clause (q) to read in its entirety as follows:

                  "(q) Permitted Specified Security Hedging Transactions;"

         SECTION 4. Liens. Section 6.02(a) of the Credit Agreement is hereby
amended by (i) deleting the word "and" at the end of clause (vii) thereof, (ii)
redesignating clause (viii) thereof as clause (ix) and (iii) inserting,
immediately following clause (vii), a new clause (viii) to read in its entirety
as follows:

                  "(viii) Liens on a Specified Security securing Permitted
         Specified Security Hedging Transactions with respect to such Specified
         Security; and"

         SECTION 5. Fundamental Changes. Section 6.03(c) of the Credit Agreement
is hereby amended by (i) adding, following the parenthetical expression "(a
"Trading Subsidiary")" on the seventh line thereof, the expression "and (vi) the
holding of Qualifying Borrower Indebtedness permitted under Section 6.01(q)" and
(ii) adding, following the expression "Qualifying Equity Interests in the
Borrower" on the ninth line thereof, the expression "Qualifying Borrower
Indebtedness,".

         SECTION 6. Investments. (a) Section 6.04 of the Credit Agreement is
hereby amended by (i) deleting the word "and" at the end of clause (p) thereof
immediately following the words "Qualifying Equity Interests in Holdings;" (ii)
redesignating clause (q) as clause (r), and (iii) inserting a new clause (q) to
read in its entirety as follows:

                  "(q) Investments made in any Person (a "REINVESTMENT PERSON")
         in whom the Borrower or any of its Subsidiaries has, or at any time
         after the Closing Date had, an Investment permitted under clause (b),
         (f) or (p) above or this clause (q) (an "ORIGINAL INVESTMENT");
         provided that the aggregate amount of Investments in any Reinvestment
         Person permitted under this clause (q) may not exceed the aggregate
         amount of the cash proceeds received, within 270 days prior to the
         making of such Investment, by the Borrower and its Subsidiaries from
         sales or other dispositions of, or distributions with respect to,
         Original Investments in such Reinvestment Person; and"

                                       2
<PAGE>   3

          (b) The proviso to Section 6.04 of the Credit Agreement is hereby
amended and restated in its entirety as follows:

                  "provided that the aggregate amount of all Investments (valued
         at the cost of acquisition thereof, without regard to any increase or
         decrease in the value thereof based on subsequent performance of the
         Person in which such Investment is held), but net, in case of each such
         Investment (but not below zero), of any distributions received by the
         Borrower or any Subsidiary Loan Party in respect of such Investment and
         any proceeds received upon any disposition (other than a disposition to
         Holdings or any of its Subsidiaries or the Parent or any of its
         Subsidiaries) of such Investment, made pursuant to Sections 6.04(j) and
         6.04(k) on or prior to any date, or referred to in Section 6.04(c)(i),
         the proviso to Section 6.04(d) and Section 6.04(e)(ii) and made on or
         prior to such date, shall not exceed the sum of (i) $275,000,000 plus
         (ii) an amount (which amount, for purposes of this proviso only, shall
         not be less than zero) equal to (x) the amount of Additional Capital as
         of such date minus (y) (A) payments of principal of the Intercompany
         Note made pursuant to Section 6.07(b)(ii)(x) on or prior to such date,
         (B) acquisitions of ADP Property permitted under Section 6.04(g) made
         on or prior to such date and (C) Capital Expenditures permitted under
         Section 6.08(b) made on or prior to such date."

         (c) Schedule 6.04 to the Credit Agreement is hereby amended by
inserting the following new paragraph 13 at the end thereof:

                  "ChoiceSeat - WCG owns 1,180,667 shares of Series A Preferred
         Stock and 5,572,333 shares of common stock of CSI, Incorporated, for a
         total investment of about $27,000,000."

         SECTION 7. Asset Sales. Section 6.05(a) of the Credit Agreement is
hereby amended by (i) inserting the phrase "sales of inventory" immediately
following the word "capacity," and (ii) inserting the phrase ", in each case"
immediately following the phrase "Cash Equivalent Investments".

         SECTION 8. Amendment to Financial Covenants. (a) The table set forth in
Section 6.08 of the Credit Agreement is hereby amended to read in its entirety
as follows:

                                       3
<PAGE>   4

<TABLE>
<CAPTION>
                             "Fiscal Year                Amount
                             ------------                ------
<S>                                                <C>
                                1999               $   2,500,000,000

                                2000               $   2,200,000,000

                                2001               $   1,500,000,000

                                2002               $     700,000,000

                                2003               $     700,000,000

                                2004               $     700,000,000

                                2005               $     700,000,000

                                2006               $     700,000,000"
</TABLE>

         (b) The table set forth in Section 6.16 of the Credit Agreement is
hereby amended to read in its entirety as follows:

<TABLE>
<CAPTION>
                              "Period                   Amount
                              -------                   ------
<S>                                                <C>
                    October 1, 1999-              $             0
                    December 31, 1999

                    January 1, 2000-              $             0
                    March 31,2000

                    April 1, 2000-                $             0
                    June 30, 2000

                    July 1, 2000-                 $    80,000,000
                    September 30, 2000

                    October 1, 2000-              $   200,000,000
                    December 31, 2000

                    January 1, 2001-              $   225,000,000
                    March 31, 2001

                    April 1, 2001-                $   325,000,000"
                    June 30, 2001
</TABLE>

         (c) The table set forth in Section 6.17(a) of the Credit Agreement is
hereby amended to read in its entirety as follows:

                                       4
<PAGE>   5

<TABLE>
<CAPTION>
                             "Period                   Total Leverage Ratio
                             -------                   --------------------
<S>                                                         <C>
                        December 31, 2000-                  15.00:1.00
                        June 29, 2001

                        June 30, 2001-                      12.00:1.00
                        December 30, 2001

                        December 31, 2001-                  11.00:1.00
                        June 29, 2002

                        June 30, 2002-                      9.00:1.00
                        December 30, 2002

                        December 31, 2002-                  7.00:1.00
                        December 30, 2003

                        December 31, 2003-                  4.00:1.00"
                        and thereafter
</TABLE>

         (d) The table set forth in Section 6.18 of the Credit Agreement is
hereby amended to read in its entirety as follows:

<TABLE>
<CAPTION>
                             "Period                  Senior Leverage Ratio
                             -------                  ---------------------
<S>                                                         <C>
                        December 31, 2000-                  9.00:1.00
                        June 29, 2001

                        June 30, 2001-                      7.00:1.00
                        December 30, 2001

                        December 31, 2001-                  5.25:1.00
                        December 30, 2002

                        December 31, 2002-                  3.25:1.0
                        December 30, 2003

                        December 31, 2003-                  2.50:1.00"
                        and thereafter
</TABLE>

         (e) In the table set forth in Section 6.19 of the Credit Agreement is
hereby amended to read in its entirety as follows:

<TABLE>
<CAPTION>
                                "Period                 Interest Coverage Ratio
                                -------                 -----------------------
<S>                                                            <C>
                        July 1, 2001-                         1.00:1.00
                        December 31, 2001

                        January 1, 2002-                      1.25:1.00
                        December 31, 2002

                        January 1, 2003-                      2.25:1.00
                        December 31, 2003

                        January 1, 2004-                      3.00:1.00"
                        and thereafter
</TABLE>

                                       5
<PAGE>   6

         SECTION 9. Representations of Borrower. The Borrower represents and
warrants that, as of the Amendment Effective Date, both before and after giving
effect to this Amendment, (i) the representations and warranties of the Borrower
set forth in Article 3 of the Credit Agreement are true and correct and (ii) no
Default has occurred and is continuing.

         SECTION 10. Amendment Fee. On or prior to the seventh Business Day
following the Signature Receipt Date, the Borrower shall pay the Administrative
Agent, for the ratable accounts of the Lenders who shall have executed and
delivered a counterpart hereof (or other written confirmation in form
satisfactory to the Administrative Agent that such Lender has signed a
counterpart hereof) to the Administrative Agent on or prior to March 30, 2000,
an amendment fee in an amount equal to 0.075% of the aggregate Commitments of
such Lenders.

         SECTION 11. Governing Law. This Amendment shall be governed by and
construed in accordance with the laws of the State of New York.

         SECTION 12. Counterparts. This Amendment may be signed in any number of
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.

         SECTION 13. Effectiveness. This Amendment shall become effective on and
as of the date hereof (the "AMENDMENT EFFECTIVE DATE") on the date that the
Administrative Agent shall have received (the "SIGNATURE RECEIPT DATE") from
each of the Loan Parties and the Required Lenders a counterpart hereof signed by
such party or facsimile or other written confirmation (in form satisfactory to
the Administrative Agent) that such party has signed a counterpart hereof.

                                       6
<PAGE>   7

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

                                      WILLIAMS COMMUNICATIONS, INC.

                                      By:    /s/ Howard Kalika
                                             -----------------------------------
                                             Title: Vice President and Treasurer

                                      WILLIAMS COMMUNICATIONS GROUP, INC.

                                      By:    /s/ Howard Kalika
                                            ------------------------------------
                                            Title: Vice President and Treasurer

                                      BANK OF AMERICA, N.A.

                                      By:    /s/ Roselyn Drake
                                            ------------------------------------
                                            Title: Managing Director

                                      THE CHASE MANHATTAN BANK

                                      By:    /s/ Constance M. Coleman
                                            ------------------------------------
                                            Title: Vice President

                                      BANK OF MONTREAL

                                      By:    /s/ Sarah Kim
                                            ------------------------------------
                                            Title: Director

<PAGE>   8

                                      THE BANK OF NEW YORK

                                      By:    /s/ Brendan Nedzi
                                             -----------------------------------
                                             Title: Senior Vice President

                                      SCOTIABANC INC.

                                      By:    /s/ W.J. Brown
                                             -----------------------------------
                                             Title: Managing Director

                                      ABN AMRO BANK N.V.

                                      By:    /s/ Ann Schwalbenberg
                                             -----------------------------------
                                             Title: Vice President

                                      By:    /s/ Ravneet Mumick
                                             -----------------------------------
                                             Title: Vice President

                                      FLEET NATIONAL BANK

                                      By:
                                             -----------------------------------
                                             Title:

                                      CIBC INC.

                                      By:    /s/ Michele E. Roller
                                             -----------------------------------
                                             Title: Executive Director
                                                    CIBC World Markets Corp.
                                                    as Agent

<PAGE>   9

                                      CREDIT SUISSE FIRST BOSTON

                                      By:    /s/ Joel Glodowski
                                            ------------------------------------
                                            Title: Managing Director

                                      By:    /s/ Chris T. Horgan
                                            ------------------------------------
                                            Title: Vice President

                                      DEUTSCHE BANK AG
                                      NEW YORK AND/OR CAYMAN ISLAND
                                      BRANCH

                                      By:    /s/ Jon D. Storck
                                            ------------------------------------
                                            Title: Vice President

                                      By:    /s/ Sangita Gupte
                                            ------------------------------------
                                            Title: Associate

                                      CREDIT LYONNAIS NEW YORK BRANCH

                                      By:
                                            ------------------------------------
                                            Title:

<PAGE>   10

                                      BANK AUSTRIA CREDITANSTALT
                                      CORPORATE FINANCE, INC.

                                      By: /s/ Richard Varalla
                                         ---------------------------------------
                                         Title: Senior Associate

                                      By: /s/ William E. McCollum, Jr.
                                         ---------------------------------------
                                         Title: Vice President

                                      FIRST UNION NATIONAL BANK

                                      By: /s/ Steven J. Haas
                                         ---------------------------------------
                                         Title: Senior Vice President

                                      IBM CREDIT CORPORATION

                                      By: /s/ Ronald J. Bachner
                                         ---------------------------------------
                                         Title: Manager Commercial and Specialty
                                             Financing

                                      THE INDUSTRIAL BANK OF JAPAN,
                                      LIMITED, NEW YORK BRANCH

                                      By: /s/ Ryusuke Aya
                                         ---------------------------------------
                                         Title: Senior Vice President, Houston
                                                         Office

<PAGE>   11

                                      BANK OF OKLAHOMA N.A.

                                      By: /s/ Robert D. Mattax
                                         ---------------------------------------
                                         Title: Senior Vice President

                                      THE FIRST NATIONAL BANK OF
                                              CHICAGO

                                      By:
                                         ---------------------------------------
                                         Title:

                                      KBC BANK, N.V.

                                      By: /s/ Robert Snauffer
                                         ---------------------------------------
                                         Title: First Vice President

                                      By: /s/ Patrick A. Janssens
                                         ---------------------------------------
                                         Title: Vice President

                                      THE FUJI BANK, LIMITED

                                      By: /s/ Jacques Azagury
                                         ---------------------------------------
                                         Title: Senior Vice President & Manager

<PAGE>   12

Acknowledged and agreed:

CNG COMPUTER NETWORKING GROUP, INC.
CRITICAL CONNECTIONS, INC.
DATA COMMUNICATIONS 2000, INC.
INTERNET ENGINEERING & CONSULTANT, INC.
WCS COMMUNICATIONS SYSTEMS,
     INC.
WCS MICROWAVE SERVICES, INC.
WCS, INC.
WILLIAMS COMMUNICATIONS OF
     VIRGINIA, INC.
WILLIAMS GLOBAL COMMUNICATIONS
     HOLDINGS, INC.
WILLIAMS INTERNATIONAL
     VENTURES COMPANY
WILLIAMS LEARNING NETWORK,
     INC.
WILLIAMS LOCAL NETWORK, INC.
WILLIAMS WIRELESS, INC.

All By: /s/ Howard Kalika
        -----------------------------------
        Title: Vice President and Treasurer

THE WILLIAMS COMPANIES, INC.

By:    /s/ John Bumgarner
       -------------------------------------
       Title: Senior Vice President<PAGE>   1

                                                                    Exhibit 10.1

                       UNITED ASSET MANAGEMENT CORPORATION

               SECOND AMENDED AND RESTATED 1994 STOCK OPTION PLAN

                                    PREAMBLE

     The plan (the "Plan") comprises three subplans: Subplan A covers options to
be granted to any key employees, including officers, and any non-employees
(other than directors) who provide important services to United Asset Management
Corporation, a Delaware corporation ("UAM") or any of its subsidiaries or
parents. Subplan B covers options to be granted to employees of UAM or of its
subsidiaries who are subject to the income tax laws of the United Kingdom, to
the extent that such options can be granted with favorable income tax treatment
under such United Kingdom laws. Subplan C covers options to be granted to
non-employee directors of UAM.

     Subject to the adjustments provided in the Plan, the aggregate number of
shares of Common Stock of UAM which may be issued and sold pursuant to incentive
stock options (as defined below) granted under Subplan A or Options (as defined
below) granted under Subplan B of the Plan shall not exceed 16,900,000 shares of
Common Stock (as defined below), which may be either authorized but unissued
shares or treasury shares.(1) Except as provided below, the aggregate number of
shares of Common Stock which may be issued and sold pursuant to non-incentive
stock options (as defined below) granted under Subplan A or Subplan C of the
Plan shall not exceed the number of shares specified in the preceding sentence
(subject to the adjustments provided in the Plan), less (1) the number of shares
issued pursuant to Subplan A incentive stock options and Subplan B Options and
(2) the number of shares underlying outstanding Subplan A incentive stock
options and Subplan B Options. Notwithstanding the foregoing, additional shares
of Common Stock may be issued and sold pursuant to non-incentive stock options
granted under Subplan A or Subplan C in amounts up to the number of additional
shares reserved for such purpose from time to time under one or more written
resolutions adopted by the Committee (as defined below). The additional shares
of Common Stock that the Committee may reserve for non-incentive stock options
pursuant to the preceding sentence shall meet the following requirements: (1)
all such additional shares must have been reacquired by UAM for not more than
their fair market value at the time of reacquisition and (2) as of the date of
the Committee's resolution to reserve the additional shares, the cumulative
amount received in cash by UAM upon the exercise of options granted under the
Plan since its adoption in 1994 shall not be less than the aggregate amount paid
for the reacquired shares that are included in such resolution or in any prior
resolution to reserve additional shares. If any option granted under the Plan
shall terminate or expire without being fully exercised, the shares which have
not been purchased will again become available for purposes of the Plan. Any
shares surrendered to UAM or withheld by UAM as payment upon the exercise of an
option granted under the Plan or

--------
(1) Of these 16,900,000 total shares, 6,400,000 were originally reserved under
the Plan by action of the shareholders in 1994, 5,500,000 were reserved under
the amended and restated Plan by action of the shareholders in 1997 and
5,000,000 have been reserved under the Second Amended and Restated Plan by
action of the shareholders in 2000.

<PAGE>   2

to cover any required tax withholding with respect to any such option will
become or remain available for purposes of the Plan.

                     SUBPLAN A--U.S. SUBPLAN PORTION OF THE
               SECOND AMENDED AND RESTATED 1994 STOCK OPTION PLAN

1.   PURPOSE OF SUBPLAN A

     The purpose of this Subplan A is to encourage key employees, including
officers, of UAM and any present or future subsidiary and parent of UAM
(hereinafter collectively referred to as the "Company") as well as non-employees
(other than directors of UAM) who provide important services to the Company to
acquire shares of common stock of UAM, $.01 par value per share (the "Common
Stock"), and thereby increase their proprietary interest in the Company's
success and provide an added incentive to remain in the employ of the Company.
For purposes of this Subplan A, the words parent and subsidiary shall be
interpreted in accordance with Section 422 and Section 424 of the Internal
Revenue Code of 1986, as from time to time amended (the "Code"). It is intended
that options granted under this Subplan A shall constitute either "incentive
stock options" within the meaning of Section 422 of the Code, or "non-incentive
stock options," as determined by the Committee named in Section 3 of this
Subplan in its sole discretion and indicated on each form of option grant (the
"Option Grant"), and the terms of this Subplan and the Option Grants shall be
construed accordingly.

2.   SHARES RESERVED UNDER SUBPLAN A

     Subject to the adjustment provided in Section 9, the aggregate number of
shares of Common Stock which may be issued and sold pursuant to options granted
under this Subplan A of the Plan shall be determined in accordance with the
Preamble above.

3.   ADMINISTRATION

     Except to the extent otherwise provided in Subplan B, the Plan shall be
administered by a committee (the "Committee") consisting of not less than three
(3) members of the Board of Directors of UAM (the "Board"). Each of the members
of the Committee shall be a person who in the opinion of counsel to the Company
is (i) a "non-employee" as such term is used in Rule 16b-3 promulgated under the
Securities Exchange Act of 1934, as amended (the "Act"), and (ii) an "outside
director" as such term is used in Treasury regulation Section 1.162-27(e) (3)
under Section 162(m) of the Code. The Committee shall be appointed by, and shall
serve at the pleasure of, the Board of Directors. A majority of the members
present at any meeting at which a quorum is present, and any acts approved in
writing by all the members of the Committee without a meeting, shall constitute
the acts of the Committee. The Committee shall have the powers granted to it in
Sections 3, 4, 5, 7 and 8 of this Subplan A. The Committee is authorized to
interpret this Subplan A and, subject to the provisions of the Subplan, to
prescribe, amend, and rescind rules and regulations relating thereto. The
Committee is further authorized, subject to the express provisions of this
Subplan A, to alter or amend the form of Option Grant attached hereto as Exhibit
A and to make all other determinations necessary or advisable in the
administration of

                                       2
<PAGE>   3

the Subplan. The interpretation and administration by the Committee of any
provisions of this Subplan A and the Option Grant shall be final and conclusive
on all persons having any interest therein.

     Notwithstanding any other provision of this Plan, if the Committee
determines that a person to whom an option may be granted under this Subplan A
will neither be a "covered employee" within the meaning of Section 162(m) of the
Code nor an employee subject to the short-swing profits rules of Section 16(b)
of the Act at any time from the date of grant until the end of the term of any
option which could be granted under this Subplan A at the time of such
determination, such options may be granted to such person by a committee
consisting of any number of members of the Board, any or all of whom would not
then be eligible to serve on the Committee. With respect to all options referred
to in this paragraph, the committee referred to in this paragraph shall have all
powers otherwise granted to the Committee in Sections 3, 4, 5, 7 and 8 of this
Subplan A, but the committee referred to in this paragraph shall not otherwise
administer this Subplan A.

     No members of the Committee or of any committee referred to in the
preceding paragraph or of the Board shall be held liable for any action or
determination made in good faith with respect to the Plan, this Subplan A, or
any option granted hereunder.

4.   OPTION GRANTS

     Options to purchase shares of Common Stock under this Subplan A may be
granted to key employees (including officers and directors who are employees) of
the Company and to non-employees who provide important services to the Company.
The term "Employee" will include, for purposes of this Subplan A key employees
as well as such non-employees who provide important services to the Company. In
selecting the Employees to whom options will be granted and in deciding how many
shares of Common Stock will be subject to each option, the Committee shall give
consideration to the importance of an Employee's duties, to his experience with
the Company, to his future value to the Company, to his present and potential
contribution to the success of the Company, and to such other factors as the
Committee may deem relevant. Subject to the express provisions of the Plan and
the form of Option Grant incorporated herein by reference as from time to time
altered or amended, the Committee shall have authority to determine with respect
to each Option Grant the number of installments, the number of shares of Common
Stock in each installment, and the exercise dates, and, to the extent not
inconsistent with the applicable provisions of the Code, if any, may specify
additional restrictions and conditions for any Option Grant. Each incentive
stock option shall expire not later than ten years from the date of the grant of
such option.

     Except as provided in Section 7 of this Subplan A, no incentive stock
option may be granted to any Employee who, at the time such option is granted
owns stock possessing more than 10 percent of the total combined voting power of
all classes of stock of the Company within the meaning of Section 422 of the
Code. Non-employees who provide services to the Company shall not be eligible to
receive incentive stock options under the Plan.

     The date of grant of an option under this Subplan A shall be the date the
Committee votes to grant the option, but no optionee shall have the right to
exercise his option until the Company

                                       3
<PAGE>   4

has executed and delivered the Option Grant to such optionee. Each option
granted under this Subplan A shall be evidenced by and subject to the terms and
conditions of the Option Grant which is incorporated into the Plan by reference
as from time to time altered or amended.

     No incentive stock option may be transferred by the optionee, other than by
will or the laws of descent and distribution. An incentive stock option can be
exercised during such individual's life only by him. Notwithstanding the
foregoing, the Committee may grant non-incentive stock options under this
Subplan A or under Subplan C that are transferable (subject to any terms and
conditions imposed by the Committee) by the optionee, either directly or in
trust, to one or more members of the optionee's family. Following any transfer
permitted pursuant to this paragraph, of which the optionee has notified the
Committee in writing, such option may be exercised by the transferee(s), subject
to all terms and conditions of the Option Grant. For these purposes, the members
of the optionee's family are only the optionee's: (i) spouse; (ii) lineal
descendants; (iii) lineal ancestors; and (iv) siblings and spouses and children
of such siblings.

5.   OPTION PRICE

     The price per share at which each option granted under this Subplan A may
be exercised shall be determined by the Committee subject to the provisions of
this Section 5. In the case of an incentive stock option, the exercise price
shall not be less than the fair market value per share on the date of the grant,
as determined by the Committee in accordance with applicable provisions of the
Code then in effect. In the case of a non-incentive stock option, the exercise
price shall not be less than 50% of the fair market value per share on the date
of grant, as so determined. In no event shall the option price per share for any
option under the Plan be less than the par value per share.

6.   LIMITATION ON AMOUNT

     The aggregate fair market value (determined at the time the option is
granted) of the stock with respect to which incentive stock options are
exercisable for the first time by an individual during any calendar year under
all plans of the Company shall not exceed $100,000. To the extent that the
aggregate value of such options (determined in the order in which they were
granted) exceeds such amount, such options shall be treated as non-incentive
stock options.

     Subject to all other applicable restrictions in the Plan, the maximum
number of shares with respect to which any options may be granted under the Plan
(including this Subplan A) to any individual during any single calendar year
shall be 6,983,439, which is the number of shares that were available for future
grants of all types of options under the Plan as of February 29, 2000
(1,983,439) plus the total number of additional shares that became available for
future grants of all types of options (5,000,000) upon stockholder approval of
this Second Amended and Restated Plan.

                                       4
<PAGE>   5

7.   SPECIAL RULE FOR 10 PERCENT SHAREHOLDERS

     The Committee may grant incentive stock options under this Subplan A to
Employees who own more than 10 percent of the combined voting stock of the
Company if (i) at the time of the Option Grant the price per share at which the
option may be exercised is at least 110 percent of the fair market value of the
stock subject to the option and (ii) such option is not exercisable after the
expiration of five years from the date such option is granted.

8.   NON-INCENTIVE STOCK OPTIONS

     Notwithstanding the provisions of Sections 4, 5, 6 and 7 of this Subplan A,
the Committee may grant options which in one or more respects do not meet the
requirements for incentive stock options established by Section 422 of the Code.
The Committee shall indicate on each Option Grant whether an incentive stock
option within the meaning of Section 422 of the Code or a non-incentive stock
option is thereby granted.

     Except as otherwise provided in this Subplan A, the Committee, in its sole
discretion, shall establish the terms and conditions for each non-incentive
stock option which it grants. Such terms and conditions may, but need not,
include some or all of the provisions of Sections 4, 5, 6 and 7 of this Subplan
A with respect to incentive stock options. If the Committee grants an option
which in all respects meets the requirements for incentive stock options it may
nonetheless designate such option a non-incentive stock option on the Option
Grant.

9.   ADJUSTMENT OF SHARES RESERVED UNDER THE PLAN

     The aggregate number and kind of shares reserved under the Plan, the
maximum number of shares as to which options may be granted to any individual
and the option price per share shall be appropriately adjusted by the Board in
the event of any recapitalization, stock split, stock dividend, combination of
shares, or other similar change in the capitalization of the Company, but no
adjustment in the option price shall be made which would reduce the option price
per share to less than the par value per share, and any adjustment in the option
price for options granted under Subplan B of the Plan shall be subject to the
requirements of Rule 5 of Subplan B.

10.  DISSOLUTION OR REORGANIZATION

(A)  VESTING PROVISIONS

     (1)  Notwithstanding anything to the contrary in this Subplan A, or in the
Option Grant, an optionee may purchase the full amount of shares of Common Stock
for which options have been granted to such optionee (the "optioned shares") and
for which the options have not been exercised, upon the occurrence of any of the
following events (individually and collectively a "Change of Control" over the
Company):

          (a)  STOCK TRANSFER OF 20% OR MORE. The acquisition by any individual,
          entity or group (within the meaning of Sections 13(d)(3) or 14(d)(2)
          of the Securities Exchange Act of 1934 (the "Act")) (a "Person") of
          beneficial ownership (within the meaning of Rule 13d-3 promulgated
          under the Act) of 20 percent or more of either (i) the then
          outstanding shares of the Common Stock or

                                       5
<PAGE>   6

          (ii) the combined voting power of the then outstanding voting
          securities of the Company entitled to vote generally in the election
          of the directors (the "Outstanding Company Voting Securities");
          provided, however, that no change in such beneficial ownership
          percentage that results solely from a change in the aggregate number
          of outstanding shares of Common Stock or Outstanding Company Voting
          Securities shall constitute a Change of Control; provided further,
          however, that the following acquisitions shall not constitute a Change
          of Control: (A) any acquisition directly from the Company (excluding
          an acquisition by virtue of the exercise of a conversion privilege);
          (B) any acquisition by the Company or by any corporation controlled by
          the Company; (C) any acquisition by any employee benefit plan (or
          related trust) sponsored or maintained by the Company or any
          corporation controlled by the Company; or (D) any acquisition by any
          corporation pursuant to a consolidation or merger, if, following such
          consolidation or merger, the conditions described in clauses (i),
          (ii), and (iii) of paragraph (c) below are satisfied; or

          (b)  CHANGE IN INCUMBENT BOARD OF 50% OR MORE. Individuals who, as of
          November 19, 1998 (the "Effective Date"), constitute the Board (the
          "Incumbent Board") ceasing for any reason to constitute at least a
          majority of the Board; provided, however, that any individual becoming
          a director subsequent to the Effective Date whose election, or
          nomination for election by the Company's shareholders, was approved by
          a vote or resolution of at least a majority of the directors then
          comprising the Incumbent Board shall be considered as though such
          individual were a member of the Incumbent Board, but excluding, for
          this purpose, any such individual whose initial assumption of office
          occurs as a result of either an actual or threatened election contest
          (as such terms are used in Rule 14a-11 of Regulation 14A promulgated
          under the Act) or other actual or threatened solicitation of proxies
          or consents by or on behalf of a Person other than the Board; or

          (c)  MERGER WITHOUT CONTINUITY OF OWNERSHIP IN EXCESS OF 60%. Adoption
          by the Board of a resolution approving an agreement of consolidation
          of the Company with or merger of the Company into another corporation
          or business entity in each case, unless, following such consolidation
          or merger, (i) more than 60 percent of, respectively, the then
          outstanding shares of common stock of the corporation resulting from
          such consolidation or merger and/or the combined voting power of the
          then outstanding voting securities of such corporation or business
          entity entitled to vote generally in the election of directors (or
          other persons having the general power to direct the affairs of such
          entity) is then beneficially owned, directly or indirectly, by all or
          substantially all of the individuals and entities who were the
          beneficial owners, respectively, of the Common Stock and Outstanding
          Company Voting Securities immediately prior to such consolidation or
          merger in substantially the same proportions as their ownership,
          immediately prior to such consolidation or merger, of the Common Stock
          and/or Outstanding Company Voting Securities, as the case may be, (ii)
          no Person (excluding the Company, any employee benefit plan (or
          related trust) of

                                       6
<PAGE>   7

          the Company or such corporation or other business entity resulting
          from such consolidation or merger and any Person beneficially owning,
          immediately prior to such consolidation or merger, directly or
          indirectly, 35 percent or more of the Common Stock and/or Outstanding
          Company Voting Securities, as the case may be) beneficially owns,
          directly or indirectly, 35 percent or more of, respectively, the then
          outstanding shares of common stock of the corporation resulting from
          such consolidation or merger or the combined voting power of the then
          outstanding voting securities of such corporation or business entity
          entitled to vote generally in the election of its directors (or other
          persons having the general power to direct the affairs of such entity)
          and (iii) at least a majority of the members of the board of directors
          (or other group of persons having the general power to direct the
          affairs of the corporation or other business entity) resulting from
          such consolidation or merger were members of the Incumbent Board at
          the time of the execution of the initial agreement providing for such
          consolidation or merger; provided that any right which shall vest by
          reason of the action of the Board pursuant to this paragraph (c) shall
          be divested, with respect to any such right not already exercised,
          upon (A) the rejection of such agreement of consolidation or merger by
          the stockholders of the Company or (B) its abandonment by either party
          thereto in accordance with its terms; or

          (d)  SALE OF ASSETS OR DISSOLUTION. Adoption by the requisite majority
          of the whole Board, or by the holders of such majority of stock of the
          Company as is required by law or by the Certificate of Incorporation
          or By-Laws of the Company as then in effect, of a resolution or
          consent authorizing (i) the dissolution of the Company or (ii) the
          sale or other disposition of all or substantially all of the assets of
          the Company, other than to a corporation or other business entity with
          respect to which, following such sale or other disposition, (A) more
          than 60 percent of, respectively, the then outstanding shares of
          common stock of such corporation and/or the combined voting power of
          the outstanding voting securities of such corporation or other
          business entity entitled to vote generally in the election of
          directors (or other persons having the general power to direct the
          affairs of such entity) is then beneficially owned, directly or
          indirectly, by all or substantially all of the individuals and
          entities who were the beneficial owners, respectively, of the Common
          Stock and Outstanding Company Voting Securities immediately prior to
          such sale or other disposition in substantially the same proportions
          as their ownership, immediately prior to such sale or other
          disposition, of the Common Stock and/or Outstanding Company Voting
          securities, as the case may be, (B) no Person (excluding the Company
          and any employee benefit plan (or related trust) of the Company or
          such corporation or other business entity and any Person beneficially
          owning, immediately prior to such sale or other disposition, directly
          or indirectly, 35 percent or more of the Common Stock and/or
          Outstanding Company Voting Securities, as the case may be)
          beneficially owns, directly or indirectly, 35 percent or more of,
          respectively, the then outstanding shares of common stock of such
          corporation and/or the combined voting power of the then outstanding
          voting securities of such corporation or other business entity
          entitled to vote generally in the election of directors (or other
          persons having the general

                                       7
<PAGE>   8

          power to direct the affairs of such entity) and (C) at least a
          majority of the members of the board of directors (or other group of
          persons having the general power to direct the affairs of such
          corporation or other entity) were members of the Incumbent Board at
          the time of the execution of the initial agreement or action of the
          Board providing for such sale or other disposition of assets of the
          Company; provided that any right which shall vest by reason of the
          action of the Board or the stockholders pursuant to this paragraph (d)
          shall be divested, with respect to any such right not already
          exercised, upon the abandonment by the Company of such dissolution, or
          such sale or other disposition of assets, as the case may be.

     (2)  Notwithstanding subsection (1) hereof, holder(s) of any unexercised
option(s) that meet the requirements for incentive stock options under Section
422 of the Code (the rights being "ISO Rights," and such holder being an "ISO
Optionee"), may elect at any time to waive the applicability of subsections (1)
hereof to such ISO Optionee's ISO Rights.

     (3)  Notwithstanding subsections (1) or (2) hereof, after a Change of
Control, and upon adoption of a plan of dissolution, liquidation, merger,
consolidation, or reorganization of the Company (the "Event"), the Board may
decide to terminate each outstanding option granted under this Subplan A. If the
Board so decides, such option(s) shall terminate as of the effective date of the
Event, but the Board shall suspend the exercise of all outstanding options a
reasonable time prior to the Event, giving each optionee not less than fourteen
days' prior written notice of the date of suspension, prior to which an optionee
may purchase in whole or in part the shares available to him as of the date of
receipt of the notice. If the Event is not consummated, the suspension shall be
removed and all options shall continue in full force and effect, subject to the
terms of their respective option grants.

(B)  EXPIRED OPTIONS

     Nothing herein shall allow the optionee to purchase optioned shares, the
options for which have expired.

11.  MANNER OF EXERCISE OF OPTIONS

     Provisions describing the terms and conditions of an optionee's exercise of
his options granted under this Plan are included in the form of Option Grant
incorporated herein by reference.

                                       8
<PAGE>   9

12.  AMENDMENT AND TERMINATION OF PLAN AND SUBPLAN A

     The Board may amend, suspend, or terminate the Plan and/or this Subplan A,
including the form of Option Grant incorporated herein by reference. No such
action, however, may, without approval or ratification by the shareholders,
increase the maximum number of shares reserved under the Plan except as provided
in Section 9 of this Subplan A, Rule 5 of Subplan B, or Section 8 of Subplan C,
alter the class or classes of individuals eligible for options, or make any
other change which, pursuant to the Code or regulations thereunder or Section
16(b) of the Act and the rules and regulations promulgated thereunder, requires
action by the shareholders. No such action may, without the consent of the
holder of the option, alter or impair any option previously granted.

     In any event, the Plan shall terminate 10 years from the date of adoption
of the second amended and restated Plan by the Board of Directors, or if
earlier, from the date of its approval by the shareholders. Any shares remaining
under the Plan at the time of termination which are not subject to outstanding
options and any shares which thereafter become available because of the
expiration or termination of an option shall cease to be reserved for purposes
of the Plan.

13.  RIGHT TO TERMINATE EMPLOYMENT

     Nothing contained herein or in any Option Grant executed pursuant hereto
shall restrict the right of the Company to terminate the employment of any
optionee at any time.

14.  DATE OF ADOPTION

     The date of adoption of this second amended and restated Plan by the Board
is March 8, 2000.

15.  DATE OF APPROVAL

     The date of approval of this amended and restated Plan by the shareholders
and the Plan's effective date is May 18, 2000.

                                       9
<PAGE>   10

                      SUBPLAN B--UK SUBPLAN PORTION OF THE
               SECOND AMENDED AND RESTATED 1994 STOCK OPTION PLAN

                RULES OF THE UNITED ASSET MANAGEMENT CORPORATION
                          EMPLOYEE SHARE OPTION SCHEME

1.   DEFINITIONS

     In this Scheme (hereinafter sometimes referred to as the "UK Subplan"),
     unless the context otherwise requires, the following words and expressions
     shall have the following meanings:

     "Act"                         the U.S. Securities Exchange Act of 1934, as
                                   amended, and the rules and regulations
                                   promulgated thereunder

     "Adoption Date"               the date on which the Scheme is adopted by
                                   the Company

     "Associated Company"          the meaning given to that term in Section 416
                                   of the U.K. Income and Corporation Taxes Act
                                   1988

     "Auditors"                    the auditors for the time being of the
                                   Company (acting as experts and not as
                                   arbitrators)

     "Board"                       the board of directors of the Company

     "Change of Control"           the meaning given to that term in Rule 6.1 of
                                   this Scheme

     "Code"                        the U.S. Internal Revenue Code of 1986, as
                                   amended, and regulations promulgated
                                   thereunder

     "Committee"                   the committee established by the Board
                                   pursuant to Rule 10.4

     "Company"                     United Asset Management Corporation

     "Control"                     the meaning given to that word by Section 840
                                   of the U.K. Income and Corporation Taxes Act
                                   1988

     "Date of Grant"               the date on which an Option is, was or is to
                                   be granted under the Scheme

     "Effective Date"              19 November 1998

                                       10
<PAGE>   11

     "Eligible Employee"           any employee of any Participating Company who
                                   is subject to the income tax laws of the
                                   United Kingdom and who is normally required
                                   to devote to his duties not less than 20
                                   hours per week (excluding meal breaks) (in
                                   the case of an employee who is also a
                                   director of any Participating Company, 25
                                   hours per week (excluding meal breaks)) and
                                   is not precluded by paragraph 8 of Schedule 9
                                   from participating in the Scheme

     "Event"                       the dissolution, liquidation, merger,
                                   consolidation, or reorganization of the
                                   Company

     "Group"                       that group comprising all of the
                                   Participating Companies

     "Incumbent Board"             the individuals who, as of the Effective
                                   Date, constitute the Board

     "Issued Company               the then issued voting securities of the
     Voting Securities"            Company entitled to vote generally in the
                                   election of the Board

     "Market Value"                on any day the closing sales price in U.S.
                                   Dollars of a Share as derived from the
                                   consolidated tape of The New York Stock
                                   Exchange for such day or, if such day, as not
                                   a trading day or if no Shares sold on such
                                   day, such closing sales price on the next
                                   previous trading day on which a sale occurred

     "Option"                      a right to purchase Shares under the Scheme

     "Option Certificate"          the certificate embodying an Option granted
                                   in accordance with these Rules

     "Option Holder"               an individual to whom an Option has been
                                   granted pursuant to the Scheme

     "Participating Company"       the Company and any other corporation which
                                   it Controls

     "Person"                      any individual, entity or group (within the
                                   meaning of Section 13(d)(3) or 14(d)(2) of
                                   the Act

     "Plan"                        the United Asset Management Corporation
                                   Second Amended and Restated 1994 Stock Option
                                   Plan, of which this Scheme is an integral
                                   part

                                       11
<PAGE>   12

     "Price"                       the price determined by the Committee in U.S.
                                   Dollars at which each Share subject to an
                                   Option may be acquired on the exercise of
                                   that Option, which price shall be, subject to
                                   Rule 5, not less than the higher of:

                                   (i)  the par value (if any) of a Share and

                                   (ii) the Market Value of a Share on the Date
                                        of Grant of that Option

     "Relevant Emoluments"         the meaning given to that term in
                                   sub-paragraph (2) of paragraph 28 of Schedule
                                   9 by virtue of subparagraph (4) of that
                                   paragraph

     "Rules"                       the terms of the Scheme, as expressed herein
                                   and as amended from time to time

     "Schedule 9"                  Schedule 9 to the U.K. Income and Corporation
                                   Taxes Act 1988

     "Scheme"                      this U.K. Subplan, as set forth in these
                                   Rules as amended from time to time

     "Share"                       a share of common stock, U.S. $.01 par value,
                                   in the capital of the Company which satisfies
                                   the conditions specified in paragraphs 10 to
                                   14 inclusive of Schedule 9 and which may
                                   either be an authorized but unissued share or
                                   a treasury share

     "Sterling Value"              in respect of an Option, the sterling
                                   equivalent of the appropriate Price,
                                   calculated by reference to the U.S.
                                   Dollar/Sterling exchange rate prevailing on
                                   the Date of Grant of that Option

     "Subplan A"                   the portion of the Plan applicable to key
                                   employees of, and non-employees (other than
                                   directors of the Company) who provide
                                   important services to, a Participating
                                   Company

     "Subplan C"                   the portion of the Plan applicable to
                                   non-employee directors of the Company

     "Subsisting Option"           an Option which has neither lapsed nor been
                                   exercised or released, given up, or
                                   surrendered by its holder

     "UK Subplan"                  the portion of the Plan comprising the Scheme
                                   as set forth in these Rules

                                       12
<PAGE>   13

     "Year of Assessment"          year beginning on any 6th April and ending on
                                   the following 5th April

Where the context permits the singular shall include the plural and vice versa
and the masculine shall include the feminine. References to any Act or statute
shall include any statutory modification, amendment or re-enactment thereof.
Headings are for ease of reference only and shall not affect the construction or
interpretation of these Rules.

2.   GRANT OF OPTION

2.1  Subject to the terms of these Rules, the Committee may at its absolute
     discretion, from time to time, grant Options to any Eligible Employees
     under the Scheme by issuing Option Certificates to them, complying with
     Rule 2.2 below.

2.2  Each Option Certificate shall be under seal and shall specify:

     i.   the Date of Grant of the relevant Option;

     ii.  the number of Shares for which the Option is granted (which shall not
          be so large that the grant of an Option for that number of Shares
          would cause the applicable limits specified in Rule 3 to be exceeded);

     iii. the Price at which the relevant Shares can be acquired; and

     iv.  any conditions on the Option imposed by the Committee, including
          (without limitation) any vesting schedule.

     In addition each Option Certificate shall indicate that Options cannot be
     transferred, assigned or charged and that any purported transfer,
     assignment or charge shall cause the relevant Option to lapse forthwith.

     Each Option Certificate shall be accompanied by a "form of acceptance" (as
     described in Rule 4.3) which shall indicate that the Option to which it
     relates will automatically lapse if the Option holder does not sign and
     return such form to the Company within 3 months of the Date of Grant.

3.   LIMITATIONS

3.1  Subject to adjustment as provided in Rule 5, the aggregate number of Shares
     in respect of which Options may be granted under the Scheme on any Date of
     Grant or which may be issued and sold pursuant to such Options shall not
     exceed 16,900,000 Shares, less (i) any Shares then subject to any
     outstanding incentive stock option granted under Subplan A of the Plan or
     previously issued pursuant to any such incentive stock option and (ii) any
     shares that are then subject to any outstanding non-incentive stock option
     granted under Subplan A or Subplan C or previously issued pursuant to any
     such non-incentive stock option and are not reacquired shares (as described
     in the Preamble to the Plan). If any

                                       13
<PAGE>   14

     Option granted under the Plan shall lapse or shall be released, given up or
     surrendered without being fully exercised, the Shares which have not been
     purchased under the Option shall again become available for purposes of the
     Plan.

3.2  No Option shall be granted to an Eligible Employee if immediately following
     such grant he would hold Subsisting Options with an aggregate Sterling
     Value exceeding (pound)30,000.

     For the purposes of this Rule 3.2. Options shall include all Options
     granted under this Scheme and all options granted under any other scheme
     approved under Schedule 9 and established by the Company or any Associated
     Company.

3.3  The maximum number of Shares with respect to which any options may be
     granted under the Plan (including this UK Subplan) to any individual during
     any single calendar year shall be 100,000 Shares.

4.   EXERCISE OF OPTIONS

4.1  Any Option which has not lapsed may be exercised only after the earliest of
     the following events:

     i.   the first anniversary of the Date of Grant;

     ii.  the death of the Option holder;

     iii. the Option holder ceasing to be an employee of any Participating
          Company by reason of injury, disability, redundancy or retirement or,
          at the discretion of the Committee, for any other reason;

     iv.  a Change of Control of the Company, but only in respect of an Option
          granted after April 1, 1999.

     Provided always that when granting an Option the Committee may provide that
     the Option or any part of it shall not become exercisable under sub Rules
     4.1 (i), (ii) or (iii) above until after such time(s) as the Committee
     determine and any such restriction on the Option's exercisability shall be
     set forth in the Option Certificate for that Option. For the avoidance of
     doubt, once an Option has become exercisable under Rule 4.1 (iv), it shall
     be exercisable in full.

4.2  Once an Option has become exercisable under Rule 4.1 above, it may be
     exercised either in whole or in part at any time unless or until it shall
     lapse under Rule 4.3 below, but subject in all cases to Rule 7 below.

4.3  An Option shall lapse on the earliest of the following events:

     i.   the expiry of three months from the Date of Grant, unless the Option
          holder has previously given notice to the Company of his acceptance of
          the Scheme's Rules

                                       14
<PAGE>   15

          using the form of acceptance supplied to him with the relevant Option
          Certificate;

     ii.  subject to a shorter period specified in the Option Certificate, the
          tenth anniversary of the Date of Grant;

     iii. subject to a shorter period specified in the Option Certificate, the
          first anniversary of the Option holder's death;

     iv.  the Option holder ceasing to be an employee of any Participating
          Company by reason of gross misconduct;

     v.   subject to a shorter period specified in the Option Certificate, the
          expiry of three months after the date on which the Option holder
          ceases to be an employee of any Participating Company otherwise than
          by reason of death or gross misconduct in circumstances in which
          sub-clause (iv) applies;

     vi.  the Option holder being adjudicated bankrupt; and

     vii. the first date upon which the Option holder purports to transfer,
          assign or charge the Option.

5.   VARIATION OF SHARE CAPITAL

     In the event of any capitalization or rights issue or any stock split or
     stock dividend or any consolidation, sub-division or reduction of capital
     by the Company, the number of Shares subject to any Option and the Price
     payable for each of those Shares shall be adjusted in such manner as the
     Auditors confirm to be fair and reasonable provided that:

     i.   the aggregate amount payable on the exercise of any Option in full is
          not increased;

     ii.  the Price of a Share is not reduced below its par value if any;

     iii. no adjustments shall be made without the prior approval of the Board
          of Inland Revenue; and

     iv.  following the adjustment the Shares continue to satisfy the conditions
          specified in paragraphs 10 to 14 inclusive of Schedule 9.

                                       15
<PAGE>   16

6.   CHANGE OF CONTROL

6.1  A Change of Control shall be the occurrence of any of the following events:

     i.   STOCK TRANSFER OF 20% OR MORE

          the acquisition by a Person of beneficial ownership (within the
          meaning of Rule 13d-3 promulgated under the Act) of 20 percent or more
          of either (a) the then issued Shares of the Company or (b) the
          combined voting power of the Issued Company Voting Securities;
          provided, however, that no change in such beneficial ownership
          percentage that results solely from a change in the aggregate number
          of outstanding Shares or Issued Company Voting Securities shall
          constitute a Change of Control; provided further, however, that the
          following acquisitions shall not constitute a Change of Control: (A)
          any acquisition directly from the Company (excluding an acquisition by
          virtue of the exercise of a conversion privilege); (B) any acquisition
          by the Company or any Associated Company; (C) any acquisition by any
          employee benefit plan (or related trust) sponsored or maintained by
          the Company or any Associated Company; or (D) any acquisition by any
          corporation pursuant to a consolidation or merger, if, following such
          consolidation or merger, the conditions described in clauses (a), (b),
          and (c) of Rule 6.1(iii) below are satisfied; or

     ii.  CHANGE IN INCUMBENT BOARD OF 50% OR MORE

          the Incumbent Board ceasing for any reason to constitute at least a
          majority of the Board; provided, however, that any individual becoming
          a director subsequent to the Effective Date whose election, or
          nomination for election by the Company's shareholders, was approved by
          a vote or resolution of at least a majority of the directors then
          comprising the Incumbent Board shall be considered as though such
          individual were a member of the Incumbent Board, but excluding, for
          this purpose, any such individual whose initial assumption of office
          occurs as a result of either an actual or threatened election contest
          (as such terms are used in Rule 14a-11 of Regulation 14A promulgated
          under the Act) or other actual or threatened solicitation of proxies
          or consents by or on behalf of a Person other than the Board; or

     iii. MERGER WITHOUT CONTINUITY OF OWNERSHIP IN EXCESS OF 60%

          the adoption by the Board of a resolution approving an agreement of
          consolidation of the Company with or merger of the Company into
          another corporation or business entity in each case, unless, following
          such consolidation or merger, (a) more than 60 percent of,
          respectively, the then issued shares of common stock of the
          corporation resulting from such consolidation or merger and/or the
          combined voting power of the then issued voting securities of such
          corporation or business entity entitled to vote generally in the
          election of directors (or other persons having the general power to
          direct the affairs of such

                                       16
<PAGE>   17

          entity) is then beneficially owned, directly or indirectly, by all or
          substantially all of the individuals and entities who were the
          beneficial owners, respectively, of the Shares and Issued Company
          Voting Securities immediately prior to such consolidation or merger in
          substantially the same proportions as their ownership, immediately
          prior to such consolidation or merger, (b) no Person (excluding the
          Company, any employee benefit plan (or related trust) of the Company
          or such corporation or other business entity resulting from such
          consolidation or merger and any Person beneficially owning,
          immediately prior to such consolidation or merger, directly or
          indirectly, 35 percent or more of the Shares and/or Issued Company
          Voting Securities, as the case may be) beneficially owns, directly or
          indirectly, 35 percent or more of, respectively, the then issued
          shares of common stock of the corporation resulting from such
          consolidation or merger or the combined voting power of the then
          outstanding voting securities of such corporation or business entity
          entitled to vote generally in the election of its directors (or other
          persons having the general power to direct the affairs of such entity)
          and (c) at least a majority of the members of the board of directors
          (or other group of persons having the general power to direct the
          affairs of the corporation or other business entity) resulting from
          such consolidation or merger were members of the Incumbent Board at
          the time of the execution of the initial agreement providing for such
          consolidation or merger; provided that any right which shall vest by
          reason of the action of the Board pursuant to this paragraph (iii)
          shall be divested, with respect to any such right not already
          exercised upon (A) the rejection of such agreement of consolidation or
          merger by the shareholders of the Company or (B) its abandonment by
          either party thereto in accordance with its terms; or

     iv.  SALE OF ASSETS OR DISSOLUTION

          the adoption by the requisite majority of the whole Board, or by the
          holders of such majority of stock of the Company as is required by law
          or by the certificate of incorporation or by-laws of the Company as
          then in effect, of a resolution or consent authorizing (a) the
          dissolution of the Company or (b) the sale or other disposition of all
          or substantially all of the assets of the Company, other than to a
          corporation or other business entity with respect to which, following
          such sale or other disposition, (A) more than 60 percent of,
          respectively, the then issued shares of common stock of such
          corporation and/or the combined voting power of the issued voting
          securities of such corporation or other business entity entitled to
          vote generally in the election of directors (or other persons having
          the general power to direct the affairs of such entity) is then
          beneficially owned, directly or indirectly, by all or substantially
          all of the individuals and entities who were the beneficial owners,
          respectively, of the Shares and/or Issued Company Voting Securities
          immediately prior to such sale or other disposition in substantially
          the same proportions as their ownership, immediately prior to such
          sale or other disposition, of the Shares and/or Issued Company Voting
          Securities, as the case may be, (B) no Person (excluding the Company
          and any employee benefit plan (or related trust) of the Company or
          such corporation or

                                       17
<PAGE>   18

          other business entity and any Person beneficially owning, immediately
          prior to such sale or other disposition, directly or indirectly, 35
          per cent or more of the Shares and/or Issued Company Voting
          Securities, as the case may be) beneficially owns, directly or
          indirectly, 35 percent or more of, respectively, the then issued
          shares of common stock of such corporation and/or the combined power
          of the then outstanding voting securities of such corporation or other
          business entity entitled to vote generally in the election of
          directors (or other persons having the general power to direct the
          affairs of such entity) and (C) at least a majority of the members of
          the board of directors (or other group of persons having the general
          power to direct the affairs of such corporation or other entity) were
          members of the Incumbent Board at the time of the execution of the
          initial agreement or action of the Board providing for such sale or
          other disposition of assets of the Company; provided that any right
          which shall vest by reason of the action of the Board or the
          stockholders pursuant to this paragraph (iv) shall be divested, with
          respect to any such right not already exercised, upon the abandonment
          by the Company of such dissolution, or such sale or other disposition
          of assets, as the case may be.

6.2  In the event of a Change of Control of the Company, notwithstanding any
     decision of the Board restricting the Option's excisability under Rule 4.1,
     all Options shall be exercisable in full or in part at the Option holder's
     discretion provided that one of the events referred to in Rule 4.1(i) to
     (iv) has occurred.

6.3  Notwithstanding Rule 4.1, after a Change of Control, and upon the adoption
     of a plan for an Event, the Board may elect to terminate each Subsisting
     Option. If the Board so elects, such Option shall terminate as of the
     effective date of the Event, but the Board shall suspend the exercise of
     all Subsisting Options a reasonable time prior to the Event, giving each
     Option holder not less than fourteen days written notice of the date of
     suspension, prior to which an Option holder may purchase in whole or in
     part the Shares available to him as of the date of receipt of the notice.
     If the Event is not consummated, the suspension shall be removed and all
     Options shall continue in full force and effect, subject to the terms of
     their respective Option Certificates.

6.4  For the avoidance of doubt, nothing in this Rule 6 shall entitle an Option
     holder to exercise an Option which has previously lapsed.

7.   MANNER OF EXERCISE OF OPTIONS

7.1  No Option may be exercised by an individual at any time when he is
     precluded by paragraph 8 of Schedule 9 from participating in the Scheme.

7.2  An Option shall be exercised by the Option holder, or as the case may be
     his personal representative, giving notice to the Company in writing of the
     number of Shares in respect of which he wishes to exercise the Option and
     making arrangements reasonably acceptable to the Committee for payment of
     the appropriate amount, and submitting the

                                       18
<PAGE>   19

     relevant Option Certificate. Any such notice shall be effective on the date
     of its receipt by the Company.

7.3  Shares shall be allocated and issued pursuant to a notice of exercise
     within 30 days of the date of exercise.

8.   RIGHTS ATTACHING TO SHARES

     All Shares allocated pursuant to the exercise of an Option shall rank pari
     passu in all respects with all other Shares in issue at the date of such
     allocation.

9.   AVAILABILITY OF SHARES

     The Company shall at all times procure that it can secure the issue or the
     transfer of sufficient Shares to permit the exercise of all Subsisting
     Options.

10.  LOSS OF OFFICE

     If any Option holder shall cease to be an employee of a Participating
     Company within the Group for any reason, he shall not be entitled by way of
     compensation for loss of office or otherwise howsoever to any sum or other
     benefit to compensate him for any loss of any right under the Scheme, and
     in returning the form of acceptance referred to in Rule 4.3 he shall be
     deemed to have agreed to this.

11.  ADMINISTRATION AND AMENDMENT

11.1 No member of the Committee or the Board shall be held liable for any action
     or determination made in good faith with respect to the Plan, the UK
     Subplan, these Rules or any Option granted hereunder.

11.2 The cost of establishing and operating the Scheme shall be borne by the
     Participating Companies in such proportions as the Board shall determine.

11.3 The Board may from time to time suspend or terminate the Plan and/or the UK
     Subplan or amend these Rules or the form of Option Certificate, provided
     that:

     i.   no such action may, without approval or ratification by the Company's
          shareholders, increase the maximum number of Shares reserved under the
          UK Subplan (except as provided in Rule 5) or under the Plan (except as
          otherwise expressly provided in the Plan), alter the class or classes
          of employees eligible for Options, or make any other such change
          which, pursuant to Section 16(b) of the Act and the rules and
          regulations promulgated thereunder, requires action by the Company's
          shareholders;

                                       19
<PAGE>   20

     ii.  except as provided in Rule 11.5, no such action may detrimentally
          affect an Option holder as regards an Option granted prior to the
          taking of such action; and

     iii. no amendment to these Rules shall have effect until approved by the
          Board of the Inland Revenue.

11.4 The Scheme shall be administered by the Committee, the members of which
     shall be appointed by and shall serve at the pleasure of the Board (subject
     to the restrictions of this Rule 11.4). Notwithstanding the foregoing,
     until and unless the Board shall have constituted the Committee pursuant to
     this Rule 10.4, the committee serving from time to time as administrator of
     the Plan generally shall also serve as the Committee for purposes of the UK
     Subplan. Actions taken by a majority of the members present at any meeting
     of the Committee at which a quorum is present, and any acts approved in
     writing by all members of the Committee without a meeting, shall constitute
     the acts of the Committee. The Committee shall have all powers of
     administration granted under these Rules, except such powers as are
     expressly reserved to the Board. The Committee is authorized to interpret
     these Rules and, subject to the provisions of Rule 11.3, to prescribe,
     amend, and rescind rules and regulations relating thereto. The Committee is
     further authorized. subject to the express provisions of the Plan and these
     Rules, to alter or amend the form of Option Certificate pursuant to which
     Options may be granted under the Scheme from time to time and to make all
     determinations necessary or advisable in the administration of the Scheme.
     The interpretation and administration by the Committee of any provisions of
     the Plan and the UK Subplan, including these Rules, and any Option
     Certificate issued pursuant to the Scheme shall be final, binding and
     conclusive on all persons having any interest therein.

11.5 Any notice or communication to be given by or on behalf of the Company to
     any Eligible Employee may be given by personal delivery or by sending the
     same by ordinary post to his last known address in which case it shall be
     deemed to have been received on the day after it was posted. Any notice,
     document, option, share certificate or other communication sent by post
     shall be sent at the risk of the Eligible Employee involved.

11.6 Unless otherwise provided any notice or other communication to be given by
     an Eligible Employee to the Company shall be regarded as having been
     properly given if sent or delivered to the company secretary of the
     Participating Company by whom he is employed at that company's registered
     office, any such communication being effective only upon receipt.

11.7 The Scheme shall at all times be read in accordance with the provisions of
     the U.K. Income and Corporation Taxes Act 1988 and insofar as any of its
     Rules shall be inconsistent with any of the said provisions and/or with any
     requirements of the Board of Inland Revenue necessary for its approval or
     continued approval under the said Act they shall be deemed automatically
     varied or deleted in such a way as to ensure compliance with the same.

                                       20
<PAGE>   21

          SUBPLAN C--NON-EMPLOYEE ("ELIGIBLE") DIRECTOR PORTION OF THE
               SECOND AMENDED AND RESTATED 1994 STOCK OPTION PLAN

1.   PURPOSE OF SUBPLAN C

     The purpose of this Subplan C is to grant options to purchase shares of the
common stock, $.01 par value (the "Common Stock"), of United Asset Management
Corporation (the "Company") to Eligible Directors (as defined in Section 4 of
this Subplan) of the Company at market value on the date of grant, and to permit
the granting of stock options to Eligible Directors at an exercise price less
than market value at the date of grant as an alternative to the payment of
Directors' fees in cash. The Company believes that the granting of such options
will serve to enhance the Company's ability to attract and retain the services
of such persons, to provide additional incentives to them and to encourage the
highest level of performance by them by offering them a proprietary interest in
the Company's success. The Company also believes that the Plan will encourage
directors to make greater equity investment in the Company, more closely
aligning the interests of the directors and the stockholders.

2.   SHARES RESERVED UNDER SUBPLAN C

     Subject to the adjustment provided in Section 8, the aggregate number of
shares of Common Stock which may be issued and sold pursuant to options granted
under this Subplan C of the Plan shall not exceed 800,000 shares (or, if less,
the then remaining aggregate number of shares determined in accordance with the
Preamble to the Plan), which may be either authorized but unissued shares or
treasury shares. If any option granted under the Plan shall terminate or expire
without being fully exercised, the shares which have not been purchased will
again become available for purposes of the Plan.

3.   ADMINISTRATION

     This Subplan C shall be interpreted and administered by a committee (the
"Committee") consisting of not less than three (3) members of the Board of
Directors of the Company (the "Board") appointed pursuant to Section 3 of
Subplan A of the Plan. The interpretation and administration by the Committee of
any provisions of the Plan and any option granted thereunder shall be final and
conclusive on all persons having any interest therein.

     No members of the Committee or the Board shall be held liable for any
action or determination made in good faith with respect to the Plan or any
option granted thereunder.

4.   OPTION GRANTS

     "Eligible Directors" shall mean directors of the Company who are directors
on the date of grant and who are not officers or employees of the Company. All
options granted under this Subplan C shall be non-incentive stock options within
the meaning of Section 422 of the Internal Revenue Code of 1986, as amended (the
"Code").

                                       21
<PAGE>   22

(A)  REGULAR OPTIONS

     Each Eligible Director who is such on the 30th day following the date on
which each Annual Meeting of the Stockholders of the Company (the "Annual
Meeting") is held during the term of the Plan shall on such 30th day be granted
a stock option to purchase 14,000 shares of Common Stock. Each such option is
defined herein as a "Regular Option."

     The date of grant of an option to an Eligible Director under this Subplan C
shall be the applicable day referred to immediately above.

(B)  DISCOUNTED OPTIONS

     (1)  Subject to such other rules as the Committee may adopt from time to
time, during the term of the Plan, options to purchase Common Stock at a
discount from fair market value on the date of grant ("Discounted Options")
shall be granted to any Eligible Director who, no later than June 30, with
respect to the six-month period following such date, and no later than December
31, with respect to the six-month period following such date (each six month
period, a "Semi-Annual Period"), has filed with the Company an irrevocable
election to receive a stock option in lieu of all or a specified portion
(expressed in terms of a percentage of the Semi-Annual Fee) of the Semi-Annual
Fee (as defined in Subsection 4(b) (iii)) earned or expected to be earned by
such Director for the Semi-Annual Period specified in the election.

     (2)  Discounted Options shall be granted to an electing Eligible Director
on the first day (July 1 or January 1) of each applicable Semi-Annual Period.

     A separate election must be made for each Semi-Annual Period, although a
Director may specify that a particular election shall apply to future
Semi-Annual Periods unless amended or revoked; provided, however, that no
amendment or revocation may be made with respect to a Semi-Annual Period after
the applicable election date for such Semi-Annual Period. The Director shall not
be entitled to receive in cash any portion of the Semi-Annual Fee for which an
election has been made to receive an option.

     (3i) Option Formula. The number of shares of Common Stock subject to each
Discounted Option granted to any Eligible Director for a Semi-Annual Period
shall be equal to the nearest number of whole shares of Common Stock, with cash
payment for fractional shares, determined in accordance with the following
formula:

                  SEMI-ANNUAL FEE         =  Number of Shares
              ------------------------
              (Fair Market Value minus
              Discounted Option Price)

     "Discounted Option Price" and "Fair Market Value" shall be defined as set
forth in Section 5 below. "Semi-Annual Fee" shall mean the quarterly retainer
fees which the Director will be entitled to receive during a Semi-Annual Period
for serving as a Director pursuant to the policy in effect for each year during
the term of the Plan, but expressly excluding fees paid for attendance at or
participation in meetings of the Board or any committee thereof; provided,
however, that if a Director elects to receive a stock option in lieu of only a
portion of the Semi-

                                       22
<PAGE>   23

Annual Fee, the Semi-Annual Fee for purposes of the foregoing formula shall
equal the portion of the Semi-Annual Fee so elected. For purposes of this
Subplan C, "Semi-Annual Fee" shall also not include expenses reimbursed by the
Company for attendance at or participation in meetings of the Board or any
committee of the Board or fees for any other services to be provided to the
Company.

5.   OPTION PRICE

(A)  REGULAR OPTION

     The price per share at which each Regular Option granted under this Subplan
C to an Eligible Director may be exercised ("Regular Option Price") shall be the
fair market value of the Common Stock as determined by the closing sales price
of such Common Stock on the consolidated tape of the principal exchange on which
such Common Stock is traded on the date of grant, or if there are no sales on
such date, on the trading day next preceding the date of grant on which a sale
took place, or, if the Common Stock is not so traded, then as determined by a
principal market maker for such Common Stock selected by the Committee ("Fair
Market Value").

(B)  DISCOUNTED STOCK OPTIONS

     The price per share at which each Discounted Option granted under this
Subplan C to an Eligible Director may be exercised (the "Discounted Option
Price," the Regular Option Price and the Discounted Option Price being sometimes
hereinafter referred to as the "Option Price") shall be seventy-five percent
(75%) of the Fair Market Value of the Common Stock on the date the Discounted
Option is granted.

(C)  In no event shall the Option Price per share for any option under this
Subplan C be less than the par value per share.

6. TERMS OF GRANT

     Each option granted under this Subplan C shall be evidenced by and subject
to the terms and conditions of an Option Grant attached hereto as Exhibit A.
Each Option Grant executed and delivered to an Eligible Director shall contain
the following terms and conditions. Each option shall expire five years from the
date of grant of such option, and shall be exercisable in full beginning on or
after the date which is six months after the date of grant thereof; provided,
however, that any option granted between March 31, 1999 and August 31, 1999,
inclusive, shall be exercisable in full beginning on or after the date on which
the Option Grant representing such option is delivered to the optionee. Each
Eligible Director to whom an option is granted may exercise such option from
time to time, in whole or in part, during the period that it is exercisable, by
payment of the Option Price of each share purchased. The Option Price of each
share purchased shall be paid in cash, or by delivery or deemed delivery of
other shares of the Company's Common Stock owned by the Eligible Director with
an aggregate Fair Market Value equal to the product of the Option Price
multiplied by the number of the shares to be purchased, or by withholding by the
Company of the number of shares of its Common Stock otherwise issuable upon
exercise of the installment with an aggregate Fair Market Value equal to the
product of the Option Price multiplied by the number of the shares (including
such withheld

                                       23
<PAGE>   24

shares) to be purchased, or by delivery of irrevocable instructions to a broker
promptly to pay to the Company the exercise price of the shares to be purchased,
or in any combination of the forms of payment. A deemed delivery of shares shall
mean the offset by the Company of a number of shares to be purchased against an
equal number of shares of the Company's Common Stock owned by the Eligible
Director. If, however, the applicable Committee established pursuant to Section
3 of this Subplan C determines in good faith that an exercise of an option
through the delivery or deemed delivery or withholding of shares of the
Company's Common Stock or through delivery of irrevocable instructions to a
broker is not in the best interest of the Company, the Committee may withhold
the right to so exercise the option and require payment of the purchase price in
cash.

     The shares of Common Stock issued upon exercise of an option granted under
this Subplan C will be acquired for investment and not with a view to
distribution thereof unless there shall be an effective registration statement
under the Securities Act of 1933, as amended (the "1933 Act"), with respect
thereto. In the event that the Company, upon the advice of counsel, deems it
necessary to list upon official notice of issuance shares to be issued pursuant
to the Plan on a national securities exchange or to register under the 1933 Act
or other applicable federal or state statute any shares to be issued pursuant to
the Plan, or to qualify any such shares for exemption from the registration
requirements of the 1933 Act under the Rules and Regulations of the Securities
and Exchange Commission or for similar exemption under state law, then the
Company shall notify each Eligible Director to that effect and no shares of
Common Stock subject to an option shall be issued until such registration,
listing or exemption has been obtained. The Company shall make prompt
application for any such registration, listing or exemption pursuant to federal
or state law or rules of such securities exchange which it deems necessary and
shall make reasonable efforts to cause such registration, listing or exemption
to become and remain effective. Nothing in this Subplan C or in the Option Grant
will confer upon any Eligible Director the right to continue as a director of
the Company. The shares of Common Stock issued on exercise of the option shall
be subject to any restrictions on transfer then in effect pursuant to the
Certificate of Incorporation or Bylaws of the Company.

     Options granted under this Subplan C shall be transferable (subject to any
terms and conditions imposed by the Committee) by the optionee, either directly
or in trust, to one or more members of the optionee's family. Following any
transfer permitted pursuant to this paragraph, of which the optionee has
notified the Committee in writing, such option may be exercised by the
transferee(s), subject to all terms and conditions of the Option Grant. For
these purposes, the members of the optionee's family are only the optionee's:
(i) spouse; (ii) lineal descendants; (iii) lineal ancestors; and (iv) siblings
and spouses and children of such siblings.

7.   TERMINATION OF DIRECTORSHIP

     An Eligible Director's right to participate in this Subplan C shall
automatically terminate if and when such Director becomes an employee of the
Company. Options granted to an Eligible Director shall cease to be exercisable 6
months after the date such Director ceases to be a director for any reason other
than death. If an Eligible Director ceases to be a director on account of his
death, any option previously granted to him, whether or not exercisable at the
date of death, may be exercised by his executor, administrator or the person or
persons to whom his rights under the

                                       24
<PAGE>   25

option shall pass by will or the applicable laws of descent and distribution, at
any time within 12 months after the date of death, but in no event after the
expiration of the option.

8.   ADJUSTMENT OF SHARES RESERVED UNDER THE PLAN

     The aggregate number and kind of shares that may be issued under this
Subplan C, the maximum number of shares as to which options may be granted to
any individual and the Option Price per share shall be appropriately adjusted by
the Board in the event of any recapitalization, stock split, stock dividend,
combination of shares, or other similar change in the capitalization of the
Company, but no adjustment in the Option Price shall be made which would reduce
the Option Price per share to less than the par value per share.

9.   DISSOLUTION OR REORGANIZATION

     Prior to a dissolution, liquidation, merger, consolidation, or
reorganization of the Company (the "Event"), the Board may decide to terminate
each outstanding option. If the Board so decides, such option shall terminate as
of the effective date of the Event, but the Board shall suspend the exercise of
all outstanding options a reasonable time prior to the Event, giving each
optionee not less than fourteen days written notice of the date of suspension,
prior to which an optionee may purchase in whole or in part the shares available
to him as of the date of receipt of the notice. If the Event is not consummated,
the suspension shall be removed and all options shall continue in full force and
effect subject to the terms of their respective Option Grants.

10.  AMENDMENT AND TERMINATION OF SUBPLAN C

     The Board may amend, suspend, or terminate this Subplan C, including the
form of Option Grant incorporated herein by reference. No such action, however,
may, without approval or ratification by the shareholders, increase the maximum
number of shares reserved under this Subplan C except as provided in Section 8,
alter the class or classes of individuals eligible for options, or make any
other change which, pursuant to the Code or regulations thereunder or Section
16(b) of the Securities Exchange Act of 1934 and the rules and regulations
promulgated thereunder, requires action by the shareholders. No such action may,
without the consent of the holder of the option, alter or impair any option
previously granted.

                                       25

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