Document:

EXHIBIT 10.2

                                    AMENDMENT

                                        TO

                              MANAGEMENT AGREEMENT

        WHEREAS,  DEMETER MANAGEMENT  CORPORATION,  a Delaware  corporation (the
"General  Partner")  on behalf of DEAN  WITTER  CORNERSTONE  FUND IV, a New York
limited partnership (the "Partnership"), and SUNRISE CAPITAL MANAGEMENT, INC., a
California  corporation  (formerly,  Sunrise  Commodities,  Inc.) (the  "Trading
Manager"),  have agreed to amend the Management  Agreement,  dated as of January
20,  1987 (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 IV

                                          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

                                          SUNRISE CAPITAL MANAGEMENT, INC.

                                          By:   /s/Martin P. Klitzner
                                             -----------------------------------
                                                Name:  Martin P. Klitzner
                                                Title:  PresidentEXHIBIT 10.1

                                    AMENDMENT

                                        TO

                              MANAGEMENT AGREEMENT

        WHEREAS,  DEMETER MANAGEMENT  CORPORATION,  a Delaware  corporation (the
"General  Partner") on behalf of MORGAN STANLEY DEAN WITTER  SPECTRUM  TECHNICAL
L.P., a Delaware limited partnership  (formerly,  Dean Witter Spectrum Technical
L.P.)  (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 1, 1994 (the "Management Agreement"),  among the
Partnership,  the  General  Partner,  and the  Trading  Manager,  to change  the
management fee and the incentive 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 6(a)(i) of the Management  Agreement is hereby changed to
1/6 of 1% (a 2% annual rate).

        2. The monthly  incentive  fee  percentage of 15% 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.

                                          MORGAN STANLEY DEAN WITTER SPECTRUM
                                          TECHNICAL 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 10.2

                                    AMENDMENT

                                        TO

                              MANAGEMENT AGREEMENT

        WHEREAS,  DEMETER MANAGEMENT  CORPORATION,  a Delaware  corporation (the
"General  Partner") on behalf of MORGAN STANLEY DEAN WITTER  SPECTRUM  TECHNICAL
L.P., a Delaware limited partnership  (formerly,  Dean Witter Spectrum Technical
L.P.) (the "Partnership"),  and CAMPBELL & COMPANY, INC., a Maryland corporation
(the "Trading Manager"), have agreed to amend the Management Agreement, dated as
of November 1, 1994 (the "Management  Agreement"),  among the  Partnership,  the
General Partner,  and the Trading Manager,  to change the management fee and the
incentive 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 6(a)(i) of the Management  Agreement is hereby changed to
1/4 of 1% (a 3% annual rate).

        2. The monthly  incentive  fee  percentage of 15% 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.

                                          MORGAN STANLEY DEAN WITTER SPECTRUM
                                          TECHNICAL 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

                                          CAMPBELL & COMPANY, INC.

                                          By:   /s/Theresa D. Becks
                                             -----------------------------------
                                                Name: Theresa D. Becks
                                                Title:  Chief Financial Officer
                                                        Campbell & Company, Inc.EXHIBIT 10.1

                                    AMENDMENT

                                        TO

                              MANAGEMENT AGREEMENT

        WHEREAS,  DEMETER MANAGEMENT  CORPORATION,  a Delaware  corporation (the
"General  Partner") on behalf of MORGAN  STANLEY DEAN WITTER  SPECTRUM  CURRENCY
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  Management  Agreement,  dated as of March 6,  2000  (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 1/12 of 4% (a 4%  annual  rate)
referred to in Section 7(a)(i) of the Management  Agreement is hereby changed to
1/12 of 2% (a 2% annual rate).

        2. The monthly  incentive  fee  percentage of 15% referred to in Section
7(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.

                                          MORGAN STANLEY DEAN WITTER SPECTRUM
                                          CURRENCY 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

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