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<PAGE> PAGE 9
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<PAGE> PAGE 21
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<PAGE> PAGE 22
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<PAGE> PAGE 26
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<PAGE> PAGE 27
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<PAGE> PAGE 28
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<PAGE> PAGE 29
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<PAGE> PAGE 30
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<PAGE> PAGE 31
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<PAGE> PAGE 32
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<PAGE> PAGE 34
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<PAGE> PAGE 35
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<PAGE> PAGE 36
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<PAGE> PAGE 37
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<PAGE> PAGE 40
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<PAGE> PAGE 41
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008 A000901 MORGAN STANLEY DEAN WITTER ADVISORS INC.
<PAGE> PAGE 42
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015 A000901 THE BANK OF NEW YORK
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<PAGE> PAGE 43
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<PAGE> PAGE 44
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<PAGE> PAGE 45
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<PAGE> PAGE 46
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008 A001001 MORGAN STANLEY DEAN WITTER ADVISORS INC.
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<PAGE> PAGE 47
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<PAGE> PAGE 48
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<PAGE> PAGE 49
070 C021000 N
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<PAGE> PAGE 50
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<PAGE> PAGE 51
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008 A001101 MORGAN STANLEY DEAN WITTER ADVISORS INC.
008 B001101 A
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015 A001101 THE BANK OF NEW YORK
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<PAGE> PAGE 52
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<PAGE> PAGE 53
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<PAGE> PAGE 54
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<PAGE> PAGE 55
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008 A001201 MORGAN STANLEY DEAN WITTER ADVISORS INC.
008 B001201 A
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008 D031201 10048
015 A001201 THE BANK OF NEW YORK
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<PAGE> PAGE 56
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<PAGE> PAGE 57
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<PAGE> PAGE 58
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<PAGE> PAGE 59
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008 A001301 MORGAN STANLEY DEAN WITTER ADVISORS INC.
008 B001301 A
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<PAGE> PAGE 60
008 D031301 10048
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008 D021302 CA
008 D031302 90017
015 A001301 THE CHASE MANHATTAN BANK, N.A.
015 B001301 C
015 C011301 NEW YORK
015 C021301 NY
015 C031301 10005
015 E011301 X
024 001300 N
025 D001301 0
025 D001302 0
025 D001303 0
025 D001304 0
025 D001305 0
025 D001306 0
025 D001307 0
025 D001308 0
028 A011300 836
028 A021300 0
028 A031300 0
028 A041300 486
028 B011300 647
028 B021300 0
028 B031300 0
028 B041300 583
028 C011300 232
028 C021300 0
028 C031300 0
028 C041300 849
028 D011300 0
028 D021300 0
028 D031300 0
028 D041300 406
028 E011300 11
028 E021300 0
028 E031300 0
028 E041300 337
028 F011300 0
028 F021300 0
028 F031300 0
028 F041300 526
028 G011300 1726
028 G021300 0
028 G031300 0
028 G041300 3187
028 H001300 0
<PAGE> PAGE 61
045 001300 Y
046 001300 N
047 001300 Y
048 001300 1.250
048 A011300 0
048 A021300 0.000
048 B011300 0
048 B021300 0.000
048 C011300 0
048 C021300 0.000
048 D011300 0
048 D021300 0.000
048 E011300 0
048 E021300 0.000
048 F011300 0
048 F021300 0.000
048 G011300 0
048 G021300 0.000
048 H011300 0
048 H021300 0.000
048 I011300 0
048 I021300 0.000
048 J011300 0
048 J021300 0.000
048 K011300 0
048 K021300 0.000
055 A001300 N
055 B001300 N
056 001300 Y
057 001300 N
062 A001300 N
062 B001300 0.0
062 C001300 0.0
062 D001300 0.0
062 E001300 0.0
062 F001300 0.0
062 G001300 0.0
062 H001300 0.0
062 I001300 0.0
062 J001300 0.0
062 K001300 0.0
062 L001300 0.0
062 M001300 0.0
062 N001300 0.0
062 O001300 0.0
062 P001300 0.0
062 Q001300 0.0
062 R001300 0.0
063 A001300 0
063 B001300 0.0
066 A001300 Y
<PAGE> PAGE 62
066 B001300 N
066 C001300 N
066 D001300 Y
066 E001300 N
066 F001300 N
066 G001300 N
067 001300 N
068 A001300 N
068 B001300 Y
069 001300 N
070 A011300 Y
070 A021300 N
070 B011300 Y
070 B021300 N
070 C011300 Y
070 C021300 N
070 D011300 N
070 D021300 N
070 E011300 Y
070 E021300 N
070 F011300 Y
070 F021300 N
070 G011300 Y
070 G021300 N
070 H011300 Y
070 H021300 N
070 I011300 Y
070 I021300 N
070 J011300 Y
070 J021300 Y
070 K011300 Y
070 K021300 Y
070 L011300 Y
070 L021300 Y
070 M011300 Y
070 M021300 Y
070 N011300 Y
070 N021300 N
070 O011300 N
070 O021300 N
070 P011300 Y
070 P021300 N
070 Q011300 N
070 Q021300 N
070 R011300 N
070 R021300 N
071 A001300 13004
071 B001300 13097
071 C001300 15837
071 D001300 82
072 A001300 12
<PAGE> PAGE 63
072 B001300 27
072 C001300 276
072 D001300 0
072 E001300 0
072 F001300 210
072 G001300 0
072 H001300 0
072 I001300 0
072 J001300 52
072 K001300 0
072 L001300 6
072 M001300 0
072 N001300 0
072 O001300 0
072 P001300 0
072 Q001300 0
072 R001300 25
072 S001300 7
072 T001300 0
072 U001300 1
072 V001300 0
072 W001300 8
072 X001300 309
072 Y001300 0
072 Z001300 -6
072AA001300 2944
072BB001300 2111
072CC011300 9796
072CC021300 0
072DD011300 30
072DD021300 0
072EE001300 0
073 A011300 0.0000
073 A021300 0.0000
073 B001300 0.0200
073 C001300 0.0000
074 A001300 0
074 B001300 0
074 C001300 0
074 D001300 0
074 E001300 1180
074 F001300 21703
074 G001300 0
074 H001300 0
074 I001300 5
074 J001300 84
074 K001300 0
074 L001300 52
074 M001300 1
074 N001300 23025
074 O001300 0
<PAGE> PAGE 64
074 P001300 23
074 Q001300 0
074 R011300 0
074 R021300 0
074 R031300 0
074 R041300 113
074 S001300 0
074 T001300 22889
074 U011300 1579
074 U021300 0
074 V011300 14.49
074 V021300 0.00
074 W001300 0.0000
074 X001300 2358
074 Y001300 0
075 A001300 0
075 B001300 16787
076 001300 0.00
SIGNATURE BARRY FINK
TITLE VICE PRESIDENT
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES -
AMERICAN OPPORTUNITIES
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 520,662,397
<INVESTMENTS-AT-VALUE> 767,422,372
<RECEIVABLES> 1,800,175
<ASSETS-OTHER> 18,415
<OTHER-ITEMS-ASSETS> 87,250
<TOTAL-ASSETS> 769,328,212
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (577,663)
<TOTAL-LIABILITIES> (577,663)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 456,210,925
<SHARES-COMMON-STOCK> 23,578,121
<SHARES-COMMON-PRIOR> 15,944,705
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 67,341,429
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 245,198,195
<NET-ASSETS> 768,750,549
<DIVIDEND-INCOME> 2,737,979
<INTEREST-INCOME> 2,014,507
<OTHER-INCOME> 0
<EXPENSES-NET> (3,304,093)
<NET-INVESTMENT-INCOME> 1,448,393
<REALIZED-GAINS-CURRENT> 74,042,509
<APPREC-INCREASE-CURRENT> 179,944,880
<NET-CHANGE-FROM-OPS> 255,435,782
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,445,841)
<DISTRIBUTIONS-OF-GAINS> (46,008,369)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8,757,084
<NUMBER-OF-SHARES-REDEEMED> (3,237,660)
<SHARES-REINVESTED> 2,113,992
<NET-CHANGE-IN-ASSETS> 397,117,640
<ACCUMULATED-NII-PRIOR> 7,077
<ACCUMULATED-GAINS-PRIOR> 39,297,660
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (3,136,439)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (3,304,093)
<AVERAGE-NET-ASSETS> 503,052,643
<PER-SHARE-NAV-BEGIN> 23.31
<PER-SHARE-NII> 0.08
<PER-SHARE-GAIN-APPREC> 11.76
<PER-SHARE-DIVIDEND> (0.07)
<PER-SHARE-DISTRIBUTIONS> (2.48)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 32.60
<EXPENSE-RATIO> 0.66
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES -
BALANCED GROWTH
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 123,724,583
<INVESTMENTS-AT-VALUE> 127,739,033
<RECEIVABLES> 586,526
<ASSETS-OTHER> 6,447
<OTHER-ITEMS-ASSETS> 71,637
<TOTAL-ASSETS> 128,403,643
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (104,417)
<TOTAL-LIABILITIES> (104,417)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 124,019,174
<SHARES-COMMON-STOCK> 8,772,505
<SHARES-COMMON-PRIOR> 6,584,329
<ACCUMULATED-NII-CURRENT> 328,440
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (62,838)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 4,014,450
<NET-ASSETS> 128,299,226
<DIVIDEND-INCOME> 1,809,801
<INTEREST-INCOME> 2,792,665
<OTHER-INCOME> 0
<EXPENSES-NET> (784,679)
<NET-INVESTMENT-INCOME> 3,817,787
<REALIZED-GAINS-CURRENT> 1,175,402
<APPREC-INCREASE-CURRENT> (1,416,501)
<NET-CHANGE-FROM-OPS> 3,576,688
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3,740,026)
<DISTRIBUTIONS-OF-GAINS> (13,846,314)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,333,509
<NUMBER-OF-SHARES-REDEEMED> (1,387,082)
<SHARES-REINVESTED> 241,749
<NET-CHANGE-IN-ASSETS> 20,447,109
<ACCUMULATED-NII-PRIOR> 250,069
<ACCUMULATED-GAINS-PRIOR> 12,608,684
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (738,566)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (784,679)
<AVERAGE-NET-ASSETS> 123,094,378
<PER-SHARE-NAV-BEGIN> 16.38
<PER-SHARE-NII> 0.48
<PER-SHARE-GAIN-APPREC> 0.15
<PER-SHARE-DIVIDEND> (0.48)
<PER-SHARE-DISTRIBUTIONS> (1.90)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.63
<EXPENSE-RATIO> 0.64
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES -
DEVELOPING GROWTH
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 97,693,566
<INVESTMENTS-AT-VALUE> 160,645,592
<RECEIVABLES> 145,304
<ASSETS-OTHER> 6,060
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 160,796,956
<PAYABLE-FOR-SECURITIES> (80,397)
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (121,516)
<TOTAL-LIABILITIES> (201,913)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 67,200,481
<SHARES-COMMON-STOCK> 4,010,824
<SHARES-COMMON-PRIOR> 3,921,506
<ACCUMULATED-NII-CURRENT> 3,982
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 30,438,554
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 62,952,026
<NET-ASSETS> 160,595,043
<DIVIDEND-INCOME> 187,437
<INTEREST-INCOME> 426,799
<OTHER-INCOME> 0
<EXPENSES-NET> 559,338
<NET-INVESTMENT-INCOME> 54,898
<REALIZED-GAINS-CURRENT> 31,720,580
<APPREC-INCREASE-CURRENT> 42,343,872
<NET-CHANGE-FROM-OPS> 74,119,350
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (52,628)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,021,132
<NUMBER-OF-SHARES-REDEEMED> (934,031)
<SHARES-REINVESTED> 2,217
<NET-CHANGE-IN-ASSETS> 78,969,884
<ACCUMULATED-NII-PRIOR> 7,110
<ACCUMULATED-GAINS-PRIOR> (1,291,581)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (483,503)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (559,338)
<AVERAGE-NET-ASSETS> 96,700,663
<PER-SHARE-NAV-BEGIN> 20.81
<PER-SHARE-NII> 0.01
<PER-SHARE-GAIN-APPREC> 19.23
<PER-SHARE-DIVIDEND> (0.01)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 40.04
<EXPENSE-RATIO> 0.58
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES -
DIVIDEND GROWTH
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 780,596,104
<INVESTMENTS-AT-VALUE> 742,151,340
<RECEIVABLES> 1,470,969
<ASSETS-OTHER> 25,839
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 743,648,148
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (836,652)
<TOTAL-LIABILITIES> (836,652)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 655,208,436
<SHARES-COMMON-STOCK> 37,296,682
<SHARES-COMMON-PRIOR> 32,805,517
<ACCUMULATED-NII-CURRENT> 1,046,212
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 125,001,612
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (38,444,764)
<NET-ASSETS> 742,811,496
<DIVIDEND-INCOME> 18,462,601
<INTEREST-INCOME> 778,588
<OTHER-INCOME> 0
<EXPENSES-NET> (4,691,559)
<NET-INVESTMENT-INCOME> 14,549,630
<REALIZED-GAINS-CURRENT> 129,094,274
<APPREC-INCREASE-CURRENT> (142,695,765)
<NET-CHANGE-FROM-OPS> 948,139
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (14,356,475)
<DISTRIBUTIONS-OF-GAINS> (68,998,640)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 8,484,915
<NUMBER-OF-SHARES-REDEEMED> (7,808,848)
<SHARES-REINVESTED> 3,815,098
<NET-CHANGE-IN-ASSETS> 19,526,418
<ACCUMULATED-NII-PRIOR> 853,057
<ACCUMULATED-GAINS-PRIOR> 64,905,978
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (4,543,040)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (4,691,559)
<AVERAGE-NET-ASSETS> 783,607,914
<PER-SHARE-NAV-BEGIN> 22.05
<PER-SHARE-NII> 0.40
<PER-SHARE-GAIN-APPREC> (0.10)
<PER-SHARE-DIVIDEND> (0.40)
<PER-SHARE-DISTRIBUTIONS> (2.03)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.92
<EXPENSE-RATIO> 0.60
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES -
DIVERSIFIED INCOME
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 94,419,150
<INVESTMENTS-AT-VALUE> 84,644,181
<RECEIVABLES> 1,618,533
<ASSETS-OTHER> 3,764
<OTHER-ITEMS-ASSETS> 115,630
<TOTAL-ASSETS> 86,382,108
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (111,690)
<TOTAL-LIABILITIES> (111,690)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 97,683,138
<SHARES-COMMON-STOCK> 9,627,702
<SHARES-COMMON-PRIOR> 9,461,101
<ACCUMULATED-NII-CURRENT> (197,032)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1,372,526)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (9,843,162)
<NET-ASSETS> 86,270,418
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 7,978,491
<OTHER-INCOME> 0
<EXPENSES-NET> (437,290)
<NET-INVESTMENT-INCOME> 7,541,201
<REALIZED-GAINS-CURRENT> (2,270,326)
<APPREC-INCREASE-CURRENT> (6,985,905)
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<EQUALIZATION> 0
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<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> (231,544)
<NUMBER-OF-SHARES-SOLD> 2,660,408
<NUMBER-OF-SHARES-REDEEMED> (3,307,173)
<SHARES-REINVESTED> 813,366
<NET-CHANGE-IN-ASSETS> (7,720,719)
<ACCUMULATED-NII-PRIOR> 740,817
<ACCUMULATED-GAINS-PRIOR> (173,260)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (363,139)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (437,290)
<AVERAGE-NET-ASSETS> 90,784,636
<PER-SHARE-NAV-BEGIN> 9.93
<PER-SHARE-NII> 0.78
<PER-SHARE-GAIN-APPREC> (0.96)
<PER-SHARE-DIVIDEND> (0.77)
<PER-SHARE-DISTRIBUTIONS> (0.02)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.96
<EXPENSE-RATIO> 0.48
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES -
EMERGING MARKETS
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 13,996,921
<INVESTMENTS-AT-VALUE> 22,887,676
<RECEIVABLES> 136,201
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 1,288
<TOTAL-ASSETS> 23,025,165
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<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (136,348)
<TOTAL-LIABILITIES> (136,348)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 18,403,601
<SHARES-COMMON-STOCK> 1,579,239
<SHARES-COMMON-PRIOR> 1,678,582
<ACCUMULATED-NII-CURRENT> (38,786)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (4,367,396)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8,891,398
<NET-ASSETS> 22,888,817
<DIVIDEND-INCOME> 276,394
<INTEREST-INCOME> 27,353
<OTHER-INCOME> 0
<EXPENSES-NET> (309,317)
<NET-INVESTMENT-INCOME> (5,570)
<REALIZED-GAINS-CURRENT> 833,229
<APPREC-INCREASE-CURRENT> 9,795,780
<NET-CHANGE-FROM-OPS> 10,623,439
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> (29,513)
<NUMBER-OF-SHARES-SOLD> 421,932
<NUMBER-OF-SHARES-REDEEMED> (524,322)
<SHARES-REINVESTED> 3,047
<NET-CHANGE-IN-ASSETS> 9,616,512
<ACCUMULATED-NII-PRIOR> (2,344)
<ACCUMULATED-GAINS-PRIOR> (5,276,475)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (209,834)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (309,317)
<AVERAGE-NET-ASSETS> 16,786,750
<PER-SHARE-NAV-BEGIN> 7.91
<PER-SHARE-NII> 0
<PER-SHARE-GAIN-APPREC> 6.60
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (0.02)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.49
<EXPENSE-RATIO> 1.84
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES -
GLOBAL EQUITY
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 121,168,382
<INVESTMENTS-AT-VALUE> 173,597,105
<RECEIVABLES> 310,410
<ASSETS-OTHER> 10,770
<OTHER-ITEMS-ASSETS> 34,967
<TOTAL-ASSETS> 173,953,252
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (210,246)
<TOTAL-LIABILITIES> (210,246)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 109,590,259
<SHARES-COMMON-STOCK> 8,853,044
<SHARES-COMMON-PRIOR> 8,546,128
<ACCUMULATED-NII-CURRENT> (8,590)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 11,727,148
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 52,434,189
<NET-ASSETS> 173,743,006
<DIVIDEND-INCOME> 1,608,207
<INTEREST-INCOME> 365,445
<OTHER-INCOME> 0
<EXPENSES-NET> (1,477,316)
<NET-INVESTMENT-INCOME> 496,336
<REALIZED-GAINS-CURRENT> 16,165,852
<APPREC-INCREASE-CURRENT> 26,404,172
<NET-CHANGE-FROM-OPS> 43,066,360
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (497,530)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,823,137
<NUMBER-OF-SHARES-REDEEMED> (1,548,072)
<SHARES-REINVESTED> 31,851
<NET-CHANGE-IN-ASSETS> 48,220,794
<ACCUMULATED-NII-PRIOR> 28,138
<ACCUMULATED-GAINS-PRIOR> (4,474,238)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (1,362,346)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (1,477,316)
<AVERAGE-NET-ASSETS> 136,233,688
<PER-SHARE-NAV-BEGIN> 14.69
<PER-SHARE-NII> 0.06
<PER-SHARE-GAIN-APPREC> 4.94
<PER-SHARE-DIVIDEND> (0.06)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 19.63
<EXPENSE-RATIO> 1.08
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW SELECT DIMENSIONS INVESTMENT SERIES - GROWTH
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 72,569,459
<INVESTMENTS-AT-VALUE> 96,638,092
<RECEIVABLES> 195,156
<ASSETS-OTHER> 3,325
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 96,836,573
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (137,676)
<TOTAL-LIABILITIES> (137,676)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 65,650,194
<SHARES-COMMON-STOCK> 4,156,217
<SHARES-COMMON-PRIOR> 2,934,577
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 6,980,070
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 24,068,633
<NET-ASSETS> 96,698,897
<DIVIDEND-INCOME> 369,197
<INTEREST-INCOME> 155,716
<OTHER-INCOME> 0
<EXPENSES-NET> (596,658)
<NET-INVESTMENT-INCOME> (71,745)
<REALIZED-GAINS-CURRENT> 8,668,664
<APPREC-INCREASE-CURRENT> 15,446,798
<NET-CHANGE-FROM-OPS> 24,043,717
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3,871)
<DISTRIBUTIONS-OF-GAINS> (4,876,846)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,668,923
<NUMBER-OF-SHARES-REDEEMED> (722,403)
<SHARES-REINVESTED> 275,120
<NET-CHANGE-IN-ASSETS> 43,195,119
<ACCUMULATED-NII-PRIOR> 3,871
<ACCUMULATED-GAINS-PRIOR> 3,259,997
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (527,496)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (596,658)
<AVERAGE-NET-ASSETS> 65,936,941
<PER-SHARE-NAV-BEGIN> 18.23
<PER-SHARE-NII> (0.02)
<PER-SHARE-GAIN-APPREC> 6.65
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (1.59)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 23.27
<EXPENSE-RATIO> 0.90
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW SELECT DIMENSIONS INVESTMENT SERIES - NORTH AMERICAN GOVERNMENT SEC.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 9,455,361
<INVESTMENTS-AT-VALUE> 9,353,200
<RECEIVABLES> 61,522
<ASSETS-OTHER> 28,350
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 9,443,072
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (22,430)
<TOTAL-LIABILITIES> (22,430)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 9,493,284
<SHARES-COMMON-STOCK> 938,953
<SHARES-COMMON-PRIOR> 826,319
<ACCUMULATED-NII-CURRENT> 49,165
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (19,646)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (102,161)
<NET-ASSETS> 9,420,642
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 534,298
<OTHER-INCOME> 0
<EXPENSES-NET> (95,768)
<NET-INVESTMENT-INCOME> 438,530
<REALIZED-GAINS-CURRENT> (1,587)
<APPREC-INCREASE-CURRENT> (117,223)
<NET-CHANGE-FROM-OPS> 319,720
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (429,137)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 373,179
<NUMBER-OF-SHARES-REDEEMED> (303,201)
<SHARES-REINVESTED> 42,656
<NET-CHANGE-IN-ASSETS> 1,031,420
<ACCUMULATED-NII-PRIOR> 30,818
<ACCUMULATED-GAINS-PRIOR> (9,105)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (61,901)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (95,768)
<AVERAGE-NET-ASSETS> 9,523,218
<PER-SHARE-NAV-BEGIN> 10.15
<PER-SHARE-NII> 0.47
<PER-SHARE-GAIN-APPREC> (0.13)
<PER-SHARE-DIVIDEND> (0.46)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.03
<EXPENSE-RATIO> 1.01
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW SELECT DIMENSIONS SERIES - VALUE ADDED
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 149,765,243
<INVESTMENTS-AT-VALUE> 189,389,273
<RECEIVABLES> 410,719
<ASSETS-OTHER> 48,414
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 189,848,406
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (140,378)
<TOTAL-LIABILITIES> (140,378)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 133,632,128
<SHARES-COMMON-STOCK> 9,234,638
<SHARES-COMMON-PRIOR> 9,111,849
<ACCUMULATED-NII-CURRENT> 199,606
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 16,252,264
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 39,624,030
<NET-ASSETS> 189,708,028
<DIVIDEND-INCOME> 2,927,153
<INTEREST-INCOME> 105,003
<OTHER-INCOME> 0
<EXPENSES-NET> (1,013,271)
<NET-INVESTMENT-INCOME> 2,018,885
<REALIZED-GAINS-CURRENT> 16,263,318
<APPREC-INCREASE-CURRENT> 2,356,309
<NET-CHANGE-FROM-OPS> 20,638,512
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2,002,626)
<DISTRIBUTIONS-OF-GAINS> (6,492,085)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,641,753
<NUMBER-OF-SHARES-REDEEMED> (1,941,093)
<SHARES-REINVESTED> 422,129
<NET-CHANGE-IN-ASSETS> 14,844,206
<ACCUMULATED-NII-PRIOR> 183,347
<ACCUMULATED-GAINS-PRIOR> 6,481,031
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (913,168)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (1,013,271)
<AVERAGE-NET-ASSETS> 182,633,535
<PER-SHARE-NAV-BEGIN> 19.19
<PER-SHARE-NII> 0.22
<PER-SHARE-GAIN-APPREC> 2.08
<PER-SHARE-DIVIDEND> (0.22)
<PER-SHARE-DISTRIBUTIONS> (0.73)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 20.54
<EXPENSE-RATIO> 0.55
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW SELECT DIMENSIONS SERIES - MONEY
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 135,981,624
<INVESTMENTS-AT-VALUE> 135,981,624
<RECEIVABLES> 306,842
<ASSETS-OTHER> 7,815
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 136,296,281
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (621,041)
<TOTAL-LIABILITIES> (621,041)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 135,675,221
<SHARES-COMMON-STOCK> 135,675,221
<SHARES-COMMON-PRIOR> 120,184,715
<ACCUMULATED-NII-CURRENT> 19
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 135,675,240
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6,740,393
<OTHER-INCOME> 0
<EXPENSES-NET> (692,756)
<NET-INVESTMENT-INCOME> 6,047,637
<REALIZED-GAINS-CURRENT> 454
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 6,048,091
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6,047,731)
<DISTRIBUTIONS-OF-GAINS> (454)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 144,516,778
<NUMBER-OF-SHARES-REDEEMED> (135,074,457)
<SHARES-REINVESTED> 6,048,185
<NET-CHANGE-IN-ASSETS> 15,490,412
<ACCUMULATED-NII-PRIOR> 113
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (646,809)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (692,756)
<AVERAGE-NET-ASSETS> 129,361,745
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.54
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW SELECT DIMENSIONS INVESTMENT SERIES - UTILITIES
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 108,770,852
<INVESTMENTS-AT-VALUE> 164,949,217
<RECEIVABLES> 542,803
<ASSETS-OTHER> 10,021
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 165,502,041
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (133,627)
<TOTAL-LIABILITIES> (133,627)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 98,586,970
<SHARES-COMMON-STOCK> 6,299,489
<SHARES-COMMON-PRIOR> 4,579,609
<ACCUMULATED-NII-CURRENT> 156,036
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 10,447,043
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 56,178,365
<NET-ASSETS> 165,368,414
<DIVIDEND-INCOME> 2,084,761
<INTEREST-INCOME> 565,826
<OTHER-INCOME> 0
<EXPENSES-NET> (798,663)
<NET-INVESTMENT-INCOME> 1,851,924
<REALIZED-GAINS-CURRENT> 10,576,744
<APPREC-INCREASE-CURRENT> 33,678,427
<NET-CHANGE-FROM-OPS> 46,107,095
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,813,042)
<DISTRIBUTIONS-OF-GAINS> (778,316)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,571,246
<NUMBER-OF-SHARES-REDEEMED> (978,171)
<SHARES-REINVESTED> 126,805
<NET-CHANGE-IN-ASSETS> 79,685,229
<ACCUMULATED-NII-PRIOR> 117,223
<ACCUMULATED-GAINS-PRIOR> 648,546
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (739,430)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (798,663)
<AVERAGE-NET-ASSETS> 113,758,430
<PER-SHARE-NAV-BEGIN> 18.71
<PER-SHARE-NII> 0.34
<PER-SHARE-GAIN-APPREC> 7.69
<PER-SHARE-DIVIDEND> (0.34)
<PER-SHARE-DISTRIBUTIONS> (0.15)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 26.25
<EXPENSE-RATIO> 0.70
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW SELECT DIMENSIONS SERIES - MID-CAP EQUITY
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<INVESTMENTS-AT-COST> 58,952,387
<INVESTMENTS-AT-VALUE> 84,133,440
<RECEIVABLES> 861,749
<ASSETS-OTHER> 36,695
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 85,031,884
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (83,360)
<TOTAL-LIABILITIES> (83,360)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 49,995,867
<SHARES-COMMON-STOCK> 3,748,826
<SHARES-COMMON-PRIOR> 2,376,967
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 9,771,604
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 25,181,053
<NET-ASSETS> 84,948,524
<DIVIDEND-INCOME> 85,430
<INTEREST-INCOME> 128,006
<OTHER-INCOME> 0
<EXPENSES-NET> (73,753)
<NET-INVESTMENT-INCOME> 139,683
<REALIZED-GAINS-CURRENT> 12,556,428
<APPREC-INCREASE-CURRENT> 20,188,222
<NET-CHANGE-FROM-OPS> 32,884,333
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (146,978)
<DISTRIBUTIONS-OF-GAINS> (27,244)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,991,794
<NUMBER-OF-SHARES-REDEEMED> (633,054)
<SHARES-REINVESTED> 13,119
<NET-CHANGE-IN-ASSETS> 56,750,887
<ACCUMULATED-NII-PRIOR> 7,295
<ACCUMULATED-GAINS-PRIOR> (2,757,580)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (281,211)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (345,527)
<AVERAGE-NET-ASSETS> 36,938,140
<PER-SHARE-NAV-BEGIN> 11.86
<PER-SHARE-NII> 0.06
<PER-SHARE-GAIN-APPREC> 10.81
<PER-SHARE-DIVIDEND> (0.06)
<PER-SHARE-DISTRIBUTIONS> (0.01)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 22.66
<EXPENSE-RATIO> 0.92
</TABLE>
EXHIBIT 77(0) Morgan Stanley Dean Witter Select Dimensions
Investment Series 10f-3 Transactions For Quarters Ended
October 20, 1999- December 31, 1999 TOTAL ISSUED SECURITY
DATE PRICE SHARES % OF PRINCIPAL PURCHASED American
Opportunities Portfolio Agile Software Inc. 08/19/99 $ 21.00
4,000 0.017% $ 63,000,000.00 0.133% Deutsche Banc Alex Brown
Genentech Inc. 07/20/99 $ 97.00 34,100 0.632
$1,940,000,000.00 0.171% JP Morgan Sogecable S.A. 07/19/99
3,910 * 5,300 0.024% 82,470,189,200* 0.025% Donaldson Lufkin
& Jenrette Developing Growth Portfolio Agile Software Inc.
08/19/99 $ 21.00 700 0.016% $ 63,000,000.00 0.023% Deutsche
Banc Alex Brown Audible, Inc. 07/15/99 $ 9.00 300 0.003% $
36,000,000.00 0.008% CS First Boston Digital Insight
09/30/99 $ 15.00 2,200 0.036% $ 52,500,000.00 0.063%
Deutsche Bank Alex Brown Fairchild Semiconductor 08/03/99 $
18.50 10,800 0.221% $ 370,000,000.00 0.054% CS First Boston
Focal Communications Corp. 07/28/99 $ 13.00 5,000 0.070% $
129,350,000.00 0.050% Salomon Smith Barney Homestore.com
08/04/99 $ 20.00 2,700 0.060% $ 140,000,000.00 0.039%
Donaldson, Lufkin & Jenrette Insight Communications 07/21/99
$ 24.50 7,400 0.188% $ 563,500,000.00 0.032% Donaldson,
Lufkin & Jenrette Internet Initiative Japan 08/03/99 $ 23.00
3,800 0.097% $ 164,680,000.00 0.053% Goldman Sachs Net2Phone
Inc. 07/29/99 $ 15.00 4,000 0.097% $ 81,000,000.00 0.048%
Salomon Smith Barney Salem Communications 07/01/99 $ 22.50
4,200 0.101% $ 189,000,000.00 0.050% Salomon Smith Barney
Diversified Portfolio World Wide Fiber Inc. 07/23/99 $100.00
200,000 0.219% $ 500,000,000.00 0.040% Lehman Brothers
Growth Portfolio Acme Communications 09/30/99 $ 23.00 1,800
0.060% $ 115,000,000.00 0.036% CIBC Oppenheimer Agile
Software Inc. 08/19/99 $ 21.00 100 0.000% $ 63,000,000.00
0.003% Deutsche Banc Alex Brown Aironet Wireless 07/30/99 $
11.00 Digital Insight 09/30/99 $ 15.00 100 0.000% $
52,500,000.00 0.003% Friedman Billings Ramsey Focal
Communications 07/28/99 $ 13.00 1,200 0.020% $
129,350,000.00 0.013% Salomon Smith Barney Genentech Inc.
07/20/99 $ 97.00 1,600 0.170% $1,940,000,000.00 0.008% JP
Morgan Homestore.com 08/04/99 $ 20.00 100 0.000% $
140,000,000.00 0.001% Merrill Lynch Inktomi Corporation
08/05/99 $ 92.19 1,400 0.200% $ 304,218,750.00 0.042%
Goldman Sachs Insight Communications 07/21/99 $ 24.50 1,500
0.060% $ 563,500,000.00 0.007% Donaldson, Lufkin & Jenrette
Ixnet Inc. 08/12/99 $ 15.00 10,300 0.260% $ 97,500,000.00
0.158% Donaldson, Lukin & Jenrette Net2Phone Inc. 07/29/99 $
15.00 100 0.000% $ 81,000,000.00 0.002% BT Alex Brown
Ravisent Technologies 07/15/99 $ 12.00 1,000 0.020% $
60,000,000.00 0.020% Volpe Brown Wheton & Co. Red Hat
08/11/99 $ 14.00 1,700 0.060% $ 84,000,000.00 0.028% Thomas
Weisel Partners LLC Salem Communications 07/01/99 $ 22.50
1,700 0.060% $ 189,000,000.00 0.023% Deutsche Bank Alex
Brown Telecom Elreann 07/07/99 $ 18.99 500 0.010% $
799,500,000.00 0.001% MLCO Global Equity Portfolio Austar
United Communications 07/19/99 $ 4.70 300,000 1.009% $
423,000,000.00 0.333% Credit Suisse First Boston Internet
Initiative Japan 08/03/99 $ 23.00 6,400 0.108% $
164,680,000.00 0.089% Goldman Sachs Sogecable S.A. 07/19/99
3,910 * 1,500 0.026% 82,470,189,200* 0.007% Donaldson Lufkin
& Jenrette Telecomm Elreann 07/07/99 $ 15.99 400,000 4.626%
$1,382,475,403.00 0.463% Merrill Lynch Utilities Portfolio
Ixnet Inc. 08/12/99 $ 15.00 25,000 0.333% $ 97,500,000.00
0.385% Donaldson, Lufkin & Jenrette * Price and monetary
unit in pesetas
EXHIBIT 77(0) Morgan Stanley Dean Witter Select
Dimensions Investment Series
10f-3 Transactions (part2)
For Quarters Ended October 20, 1999-
December 31, 1999
[S] [C] [C] [C]
[C] [C] [C] [C]
TOTAL
NUMBER ISSUED
SECURITY DATE PRICE
SHARES % OF PRINCIPAL % PURCHASED
per share
ASSETS AMOUNT BY FUND BROKER
American Opportunities Portfolio
Cacheflow 11/18/99 $ 24.00
3,400 0.013% $ 120,000,000.00 0.068%
Thomas Weisel Partners
Entercom Communications 09/30/99 $ 36.00
41,000 0.290% $ 288,000,000.00 0.514% CS
First Boston
Extreme Networks, Inc. 10/19/99 $ 77.00
5,000 0.298% $ 500,500,000.00 0.077%
Thomas Weisel Partners
Freemarkets Inc. 12/09/99 $ 48.00
3,200 0.022% $ 172,800,000.00 0.089%
Goldman Sachs
Martha Stewart Living 10/18/99 $ 18.00
10,000 0.036% $ 129,600,000.00 0.139% DLJ
Metasolv Software 11/17/99 $ 19.00
2,100 0.002% $ 95,000,000.00 0.042%
Soundview
Sapient Corporation 11/15/99 $ 78.00
15,000 0.193% $ 273,000,000.00 0.429%
Goldman Sachs
Vignette Corporation 12/09/99 $139.88
13,100 0.266% $ 405,637,500.00 0.452%
Piper Jaffray
Developing Growth Portfolio
Aether Systems Inc. 10/20/99 $ 16.00
1,500 0.024% $ 96,000,000.00 0.025%
Merrill Lunch
Agilent Technologies 11/17/99 $ 30.00
9,600 0.244% $ 2,160,000,000.00 0.013%
Hambrecht & Quist
Breakaway Solutions 10/05/99 $ 14.00
2,500 0.035% $ 42,000,000.00 0.083% Dain
Rauscher
Cacheflow 11/18/99 $ 24.00
600 0.011% $ 120,000,000.00 0.012% Goldman
Sachs
Charter Communications 11/08/99 $ 19.00
14,150 0.227% $ 3,230,000,000.00 0.008%
Goldman Sachs
Epedior 12/15/99 $ 19.00
1,000 0.238% $ 162,165,000.00 0.012% DLJ
Expedia Inc. 11/09/99 $ 14.00
1,300 0.020% $ 72,800,000.00 0.025%
Goldman Sachs
Illuminet 10/07/99 $ 19.00
1,300 0.024% $ 74,100,000.00 0.033%
BancBoston RS
Immersion Corp. 11/12/99 $ 12.00
2,200 0.022% $ 51,000,000.00 0.052%
Hambrecht & Quist
Intertrust Technologies 10/26/99 $ 18.00
5,500 0.097% $ 117,000,000.00 0.085% CS
First Boston
Martha Stewart Living 10/18/99 $ 18.00
1,900 0.036% $ 129,600,000.00 0.026% DLJ
Mcafee.com 12/01/99 $ 12.00
3,100 0.028% $ 75,000,000.00 0.050%
Thomas Weisel Partners
MCK Communications 10/22/99 $ 16.00
3,900 0.061% $ 54,400,000.00 0.115%
Robertson Stephens
Metasolv Software 11/17/99 $ 19.00
3,100 0.045% $ 95,000,000.00 0.062%
Soundview
NDS 11/02/99 $ 20.00
4,000 0.062% $ 180,000,000.00 0.044%
Merrill Lynch
Radio Unica Communications 10/19/99 $ 16.00
4,000 0.066% $ 109,440,000.00 0.058%
Salomon Smith Barney
Spanish Broadcasting Systems 10/27/99 $ 20.00
9,100 0.177% $ 435,748,000.00 0.042%
Lehman Brothers
Tularik Company 12/09/99 $ 14.00
6,200 0.061% $ 97,300,000.00 0.089%
Lehman Brothers
**Price in Euros
Growth Portfolio
Aether Systems Inc. 10/20/99 $ 16.00
600 0.010% $ 96,000,000.00 0.010%
Robertson Stephens
Agilent Technologies 11/17/99 $ 30.00
3,200 0.120% $ 2,160,000,000.00 0.004%
Goldman Sachs
Breakaway Soluitons 10/05/99 $ 14.00
100 0.000% $ 42,000,000.00 0.003% Lehman
Brothers
Cacheflow 11/18/99 $ 24.00
200 0.010% $ 120,000,000.00 0.004%
BancBoston RS
Charter Communications 11/08/99 $ 19.00
14,500 0.350% $ 3,230,000,000.00 0.009% AG
Edwards
Cysive 10/15/99 $ 17.00
200 0.006% $ 56,950,000.00 0.006% First
Union Capital Markets
Expedia Inc. 11/09/99 $ 14.00
3,100 0.037% $ 72,800,000.00 0.060%
Goldman Sachs
Freemarkets Inc. 12/09/99 $ 48.00
200 0.010% $ 172,800,000.00 0.006% DLJ
Illuminet 10/07/99 $ 19.00
200 0.000% $ 74,100,000.00 0.005%
BancBoston RS
Infonet Services 12/15/99 $ 21.00
5,500 0.010% $ 1,076,928,300.00 0.153%
Merrill Lynch
Intertrust Technologies 10/26/99 $ 18.00
300 0.010% $ 117,000,000.00 0.005%
Soundview
Martha Stewart Living 10/18/99 $ 18.00
200 0.010% $ 129,600,000.00 0.006%
Merrill Lynch
Mcafee.com 12/01/99 $ 12.00
700 0.010% $ 75,000,000.00 0.011%
Hambrecht & Quist
MCK Communications 10/22/99 $ 16.00
200 0.010% $ 54,400,000.00 0.006%
Robertson Stephens
Metasolv Software 11/17/99 $ 19.00
200 0.005% $ 95,000,000.00 0.004%
BancBoston RS
NDS 11/2/99 $ 20.00
400 0.010% $ 180,000,000.00 0.004%
Merrill Lynch
Radio Unica Communications 10/19/99 $ 16.00
1,200 0.030% $ 109,440,000.00 0.018% CIBC
World Markets
Satyam Infoway 10/18/99 $ 18.00
700 0.010% $ 75,150,000.00 0.017%
Merrill Lynch
Spanish Broadcasting Systems 10/27/99 $ 20.00
8,200 0.230% $ 435,748,000.00 0.038%
Lehman Brothers
Virata Corp. 11/16/99 $ 14.00
400 0.010% $ 70,000,000.00 0.008% CS
First Boston
Women.com 10/14/99 $ 10.00
100 0.000% $ 37,500,000.00 0.003%
Salomon Smith Barney
Global Equity Portfolio
Enel Societa per Azioni 10/31/99 4.3**
35,000 1.100% 15,641,250,000.00** 0.029%
Merrill Lynch
Sappi Limited 11/15/99 $ 8.34
50,000 0.275% $ 333,550,448.00 0.125% DLJ
United Parcel Service of America 11/09/99 $ 50.00
4,300 0.280% $ 5,470,000,000.00 0.004%
Salomon Smith Barney
Utilities Portfolio
Infonet Services 12/15/99 $ 21.00
10,200 0.140% $ 1,076,928,300.00 0.182% ABN
AMRO Chicago
MORGAN STANLEY DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
Item 77.C. Matters Submitted to a Vote of Security
Holders
On August 4, 1999, a Special Meeting of the
Shareholders of the Registrant was held to vote upon:
1) For the Mid-Cap Growth Portfolio only, approval or
disapproval of a new sub-advisory Agreement between Morgan
Stanley Dean Witter Advisors Inc. and TCW Funds Management Inc.
The vote on this proposal was as follows:
FOR AGAINST ABSTAIN
2,097,761.291 44,708.393
183,251.844
2) For the Utilities Portfolio only, approval of a change in
the Portfolio's investment objective from an objective to provide
current income and long-term growth of income and capital, by
investing primarily in equity and fixed income securities of
companies engaged in the public utilities industry, to an
investment objective to seek both capital appreciation and
current income.
The vote on this proposal was as follows:
FOR AGAINST ABSTAIN
4,749,040.324 77,440.722
321,203.214
3) For the Utilities Portfolio only, approval of a change in
the Fund's investment restrictions to provide that each Portfolio
of the Fund may not: With the exception of the Utilities
Portfolio, which will invest 25% or more of the value of its
total assets in the utilities industry, invest 25% or more of the
value of its total assets in securities of issuers in any one
industry
The vote on this proposal was as follows:
FOR AGAINST ABSTAIN
4,761,279.593 59,137.277
327,267.390
To the Shareholders and Board of Trustees of
Morgan Stanley Dean Witter Select Dimensions Investment Series
(2)
Report of Independent Accountants
To the Shareholders and Trustees of
Morgan Stanley Dean Witter Select Dimensions Investment Series
In planning and performing our audits of the financial
statements of the Money Market Portfolio, North American
Government Securities Portfolio, Diversified Income Portfolio,
Balanced Growth Portfolio, Utilities Portfolio, Dividend Growth
Portfolio, Value-Added Market Portfolio, Growth Portfolio,
American Opportunities Portfolio (formerly American Value
Portfolio), Mid-Cap Equity Portfolio (formerly Mid-Cap Growth
Portfolio), Global Equity Portfolio, Developing Growth
Portfolio and Emerging Markets Portfolio (constituting the
Morgan Stanley Dean Witter Select Dimensions Investment Series,
hereafter referred to as the "Fund") for the year ended
December 31, 1999, we considered its internal control,
including control activities for safeguarding securities, in
order to determine our auditing procedures for the purpose of
expressing our opinion on the financial statements and to
comply with the requirements of Form N-SAR, not to provide
assurance on internal control.
The management of the Fund is responsible for establishing and
maintaining internal control. In fulfilling this
responsibility, estimates and judgments by management are
required to assess the expected benefits and related costs of
controls. Generally, controls that are relevant to an audit
pertain to the entity's objective of preparing financial
statements for external purposes that are fairly presented in
conformity with generally accepted accounting principles.
Those controls include the safeguarding of assets against
unauthorized acquisition, use or disposition.
Because of inherent limitations in internal control, errors or
fraud may occur and not be detected. Also, projection of any
evaluation of internal control to future periods is subject to
the risk that controls may become inadequate because of changes
in conditions or that the effectiveness of their design and
operation may deteriorate.
Our consideration of internal control would not necessarily
disclose all matters in internal control that might be material
weaknesses under standards established by the American
Institute of Certified Public Accountants. A material weakness
is a condition in which the design or operation of one or more
of the internal control components does not reduce to a
relatively low level the risk that misstatements caused by
error or fraud in amounts that would be material in relation to
the financial statements being audited may occur and not be
detected within a timely period by employees in the normal
course of performing their assigned functions. However, we
noted no matters involving internal control and its operation,
including controls for safeguarding securities, that we
consider to be material weaknesses as defined above as of
December 31, 1999.
This report is intended solely for the information and use of
the Trustees, management and the Securities and Exchange
Commission and is not intended to be and should not be used by
anyone other than these specified parties.
February 16, 2000
