Document:

EXHIBIT 10.1

                                  AMENDMENT TO

                              AMENDED AND RESTATED

                              MANAGEMENT AGREEMENT

        WHEREAS,  DEMETER MANAGEMENT  CORPORATION,  a Delaware  corporation (the
"General  Partner")  on behalf of DEAN WITTER  PORTFOLIO  STRATEGY  FUND L.P., a
Delaware limited partnership (the  "Partnership"),  and JOHN W. HENRY & COMPANY,
INC., a Florida  corporation (the "Trading  Advisor"),  have agreed to amend the
Amended  and  Restated  Management  Agreement,  dated  as of May 12,  1997  (the
"Management  Agreement"),  among the Partnership,  the General Partner,  and the
Trading  Advisor,  to change the management fee and the incentive fee payable to
the Trading Advisor.

        WHEREAS,  all provisions contained in the Management Agreement remain in
full force and effect and are modified  only to the extent  necessary to provide
for the amendment set forth below.

        NOW, THEREFORE, the parties hereto hereby amend the Management Agreement
as follows:

        1.  The  monthly  management  fee rate of 1/3 of 1% (a 4%  annual  rate)
referred to in Section 7(a) of the Management Agreement is hereby changed to 1/6
of 1% (a 2% annual rate).

        2. The  quarterly  incentive  fee  percentage  of 15% referred to in the
first paragraph of Section 7(b) of the Management Agreement is hereby changed to
20%.

        3. The foregoing changes shall take effect as of December 1, 2000.

<PAGE>

        IN WITNESS WHEREOF,  this Amendment to the Management Agreement has been
executed  for and on behalf of the  undersigned  as of the 30th day of November,
2000.

                                        DEAN WITTER PORTFOLIO STRATEGY FUND L.P.

                                        By:   Demeter Management Corporation,
                                              General Partner

                                        By:   /s/Robert E. Murray
                                           -------------------------------------
                                              Name:  Robert E. Murray
                                              Title:  President

                                        DEMETER MANAGEMENT CORPORATION

                                        By:   /s/Robert E. Murray
                                           -------------------------------------
                                              Name:  Robert E. Murray
                                              Title:  President

                                        JOHN W. HENRY & COMPANY, INC

                                        By:   /s/D.M. Kozak
                                           ---------------------------------
                                              Name:  David M. Kozak
                                              Title:  Sr. Vice PresidentEXHIBIT 10.1

                                    AMENDMENT

                                        TO

                              MANAGEMENT AGREEMENT

        WHEREAS,  DEMETER MANAGEMENT  CORPORATION,  a Delaware  corporation (the
"General Partner") on behalf of DEAN WITTER WORLD CURRENCY FUND L.P., a Delaware
limited partnership (the  "Partnership"),  DEAN WITTER REYNOLDS INC., a Delaware
corporation  ("DWR"),  and JOHN W. HENRY & COMPANY,  INC., a Florida corporation
(the "Trading Advisor"), have agreed to amend the Management Agreement, dated as
of June 1, 1995 (the "Management Agreement"), among the Partnership, the General
Partner,  DWR, and the Trading  Advisor,  to change the  management  fee and the
incentive fee payable to the Trading Advisor.

        WHEREAS,  all provisions contained in the Management Agreement remain in
full force and effect and are modified  only to the extent  necessary to provide
for the amendment set forth below.

        NOW, THEREFORE, the parties hereto hereby amend the Management Agreement
as follows:

        1. Section 5(a)(i) of the Management  Agreement shall be deleted and the
following shall be substituted in its stead:

        "(i) A monthly  management fee,  without regard to the  profitability of
the Trading Advisor's trading for the Partnership's account, equal to 1/12 of 2%
of the Net Assets of the  Partnership  (as defined in Section 5(c)) allocated to
the Trading Advisor  calculated as of the end of each calendar month (before any
reallocations  and the  deduction  of any accrued  management  fee,  any accrued
incentive  fee,  and any  redemptions  and  distributions  as of the end of such
month)."

        2. The  quarterly  incentive  fee  percentage  of 17.5%  referred  to in
Section 5(a)(ii) of the Management Agreement is hereby changed to 20%.

        3. The foregoing changes shall take effect as of December 1, 2000.

<PAGE>

        IN WITNESS WHEREOF,  this Amendment to the Management Agreement has been
executed  for and on behalf of the  undersigned  as of the 30th day of November,
2000.

                                          DEAN WITTER WORLD CURRENCY FUND L.P.

                                          By:   Demeter Management Corporation,
                                                General Partner

                                          By:   /s/Robert E. Murray
                                             -----------------------------------
                                                Name:  Robert E. Murray
                                                Title:  President

                                          DEMETER MANAGEMENT CORPORATION

                                          By:   /s/Robert E. Murray
                                             -----------------------------------
                                                Name:  Robert E. Murray
                                                Title:  President

                                          JOHN W. HENRY & COMPANY, INC

                                          By:   /s/D.M. Kozak
                                             ---------------------------------
                                                Name:  David M. Kozak
                                                Title:  Sr. Vice President

DEAN WITTER REYNOLDS INC.
(as to Section 5(a)(i))

By:   /s/Robert E. Murray
   ---------------------------------------
      Name:  Robert E. Murray
      Title:  Senior Vice-PresidentEXHIBIT 10.2

                                    AMENDMENT

                                       TO

                              MANAGEMENT AGREEMENT

        WHEREAS,  DEMETER MANAGEMENT  CORPORATION,  a Delaware  corporation (the
"General Partner") on behalf of DEAN WITTER WORLD CURRENCY FUND L.P., a Delaware
limited partnership (the "Partnership"),  and MILLBURN RIDGEFIELD CORPORATION, a
Delaware  corporation  (the  "Trading  Advisor"),   have  agreed  to  amend  the
Management  Agreement,  dated as of April 2, 1993 (the "Management  Agreement"),
among the Partnership,  the General Partner,  and the Trading Advisor, to change
the management fee and the incentive fee payable to the Trading Advisor.

        WHEREAS,  all provisions contained in the Management Agreement remain in
full force and effect and are modified  only to the extent  necessary to provide
for the amendment set forth below.

        NOW, THEREFORE, the parties hereto hereby amend the Management Agreement
as follows:

        1.  The  monthly  management  fee rate of 1/4 of 1% (a 3%  annual  rate)
referred to in Section 6(a)(i) of the Management  Agreement is hereby changed to
1/6 of 1% (a 2% annual rate).

        2. The  quarterly  incentive  fee  percentage  of 17.5%  referred  to in
Section 6(a)(ii) of the Management Agreement is hereby changed to 20%.

        3. The foregoing changes shall take effect as of December 1, 2000.

<PAGE>

        IN WITNESS WHEREOF,  this Amendment to the Management Agreement has been
executed  for and on behalf of the  undersigned  as of the 30th day of November,
2000.

                                          DEAN WITTER WORLD CURRENCY FUND L.P.

                                          By:   Demeter Management Corporation,
                                                General Partner

                                          By:   /s/Robert E. Murray
                                             -----------------------------------
                                                Name:  Robert E. Murray
                                                Title:  President

                                          DEMETER MANAGEMENT CORPORATION

                                          By:   /s/Robert E. Murray
                                             -----------------------------------
                                                Name:  Robert E. Murray
                                                Title:  President

                                          MILLBURN RIDGEFIELD CORPORATION

                                          By:   /s/George E. Crapple
                                             -----------------------------------
                                                Name: George E. Crapple
                                                Title:  Co-ChairmanEXHIBIT 10.1

                                    AMENDMENT

                                        TO

                              MANAGEMENT AGREEMENT

        WHEREAS,  DEMETER MANAGEMENT  CORPORATION,  a Delaware  corporation (the
"General  Partner")  on behalf of DEAN  WITTER  CORNERSTONE  FUND II, a New York
limited partnership (the  "Partnership"),  and JOHN W. HENRY & COMPANY,  INC., a
Florida corporation (the "Trading Manager"), have agreed to amend the Management
Agreement,  dated as of November 14, 1983, as amended by Amendment to Management
Agreement,  dated as of February 1, 1998 (together, the "Management Agreement"),
among the Partnership,  the General Partner,  and the Trading Manager, to change
the management fee payable to the Trading Manager.

        WHEREAS,  all provisions contained in the Management Agreement remain in
full force and effect and are modified  only to the extent  necessary to provide
for the amendment set forth below.

        NOW, THEREFORE, the parties hereto hereby amend the Management Agreement
as follows:

        1.  The  monthly  management  fee rate of 1/3 of 1% (a 4%  annual  rate)
referred to in Section 7(a)(i) of the Management  Agreement is hereby changed to
7/24 of 1% (a 3.5% annual rate).

        2. The foregoing change shall take effect as of December 1, 2000.

<PAGE>

        IN WITNESS WHEREOF,  this Amendment to the Management Agreement has been
executed  for and on behalf of the  undersigned  as of the 30th day of November,
2000.

                                          DEAN WITTER CORNERSTONE FUND II

                                          By:   Demeter Management Corporation,
                                                General Partner

                                          By:   /s/ Robert E. Murray
                                             -----------------------------------
                                                Name:  Robert E. Murray
                                                Title:  President

                                          DEMETER MANAGEMENT CORPORATION

                                          By:   /s/ Robert E. Murray
                                             -----------------------------------
                                                Name:  Robert E. Murray
                                                Title:  President

                                          JOHN W. HENRY & COMPANY, INC

                                          By:   /s/ V. Sedlacek
                                             -----------------------------------
                                                Name:  Verne Sedlacek
                                                Title:  President

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