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<PAGE> PAGE 2
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<PAGE> PAGE 3
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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<PAGE> PAGE 9
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<PAGE> PAGE 10
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<PAGE> PAGE 11
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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<PAGE> PAGE 17
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<PAGE> PAGE 18
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<PAGE> PAGE 19
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<PAGE> PAGE 20
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<PAGE> PAGE 21
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<PAGE> PAGE 22
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<PAGE> PAGE 23
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<PAGE> PAGE 24
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<PAGE> PAGE 25
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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 33
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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 38
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<PAGE> PAGE 39
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<PAGE> PAGE 40
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008 A000901 DEAN WITTER INTERCAPITAL INC.
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015 C030901 10286
015 E010901 X
024 000900 Y
025 A000901 LEHMAN BROTHER HOLDINGS INC.
025 B000901 13-2518466
025 C000901 E
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025 B000902 13-5674085
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<PAGE> PAGE 41
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<PAGE> PAGE 42
057 000900 N
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069 000900 N
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<PAGE> PAGE 43
070 J020900 N
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<PAGE> PAGE 44
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008 A001001 DEAN WITTER INTERCAPITAL INC.
008 B001001 A
008 C001001 801-42061
008 D011001 NEW YORK
008 D021001 NY
008 D031001 10048
015 A001001 THE CHASE MANHATTAN BANK, N.A.
015 B001001 C
015 C011001 NEW YORK
015 C021001 NY
015 C031001 10005
<PAGE> PAGE 45
015 E011001 X
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<PAGE> PAGE 46
048 I011000 0
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<PAGE> PAGE 47
070 F011000 Y
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<PAGE> PAGE 48
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008 A001101 DEAN WITTER INTERCAPITAL INC.
008 B001101 A
<PAGE> PAGE 49
008 C001101 801-42061
008 D011101 NEW YORK
008 D021101 NY
008 D031101 10048
015 A001101 THE BANK OF NEW YORK
015 B001101 C
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015 C021101 NY
015 C031101 10286
015 E011101 X
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<PAGE> PAGE 50
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<PAGE> PAGE 51
070 A021100 Y
070 B011100 N
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<PAGE> PAGE 52
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<PAGE> PAGE 53
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008 A001201 DEAN WITTER INTERCAPITAL INC.
008 B001201 A
008 C001201 801-42061
008 D011201 NEW YORK
008 D021201 NY
008 D031201 10048
008 A001202 TCW FUNDS MANAGEMENT, INC.
008 B001202 S
008 C001202 801-29075
008 D011202 LOS ANGELES
008 D021202 CA
008 D031202 90017
015 A001201 THE CHASE MANHATTAN BANK, N.A.
015 B001201 C
015 C011201 NEW YORK
015 C021201 NY
015 C031201 10005
015 E011201 X
024 001200 N
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<PAGE> PAGE 54
028 G021200 32
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<PAGE> PAGE 55
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<PAGE> PAGE 56
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<PAGE> PAGE 57
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008 A001301 DEAN WITTER INTERCAPITAL INC.
008 B001301 A
008 C001301 801-42061
008 D011301 NEW YORK
008 D021301 NY
008 D031301 10048
015 A001301 THE BANK OF NEW YORK
015 B001301 C
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015 C021301 NY
015 C031301 10286
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<PAGE> PAGE 58
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<PAGE> PAGE 59
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<PAGE> PAGE 60
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SIGNATURE BARRY FINK
TITLE VICE PRESIDENT
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<ARTICLE> 6
<LEGEND>
DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
MONEY MARKET POTFOLIO 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES 12/31/97
<SERIES>
<NUMBER> 1
<NAME> MONEY MARKET PORTFOLIO
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<TABLE> <S> <C>
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DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
NORTH AMERICAN GOVT. 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 2
<NAME> THE NORTH AMERICAN GOVT. SEC. PORTFOLIO
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<LEGEND>
DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
DIVERSIFIED INCOME PORTFOLIO 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER INVESTMENT SERIES
<SERIES>
<NUMBER> 3
<NAME> THE DIVERSIFIED INCOME PORTFOLIO
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<TABLE> <S> <C>
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<LEGEND>
DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
BALANCED PORTFOLIO 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 4
<NAME> THE BALANCED PORTFOLIO
<S> <C>
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<TABLE> <S> <C>
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DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
UTILITIES PORTFOLIO 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 5
<NAME> THE UTILITIES PORTFOLIO
<S> <C>
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DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
DIVIDEND GROWTH PORTFOLIO 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 6
<NAME> DIVIDEND GROWTH PORTFOLIO
<S> <C>
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DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
VALUE ADDED 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 7
<NAME> VALUE ADDED PORTFOLIO
<S> <C>
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DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
CORE EQUITY 12/31/97
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<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 8
<NAME> THE CORE EQUITY PORTFOLIO
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DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
AMERICAN VALUE 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 9
<NAME> AMERICAN VALUE PORTFOLIO
<S> <C>
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
GLOBAL EQUITY 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 10
<NAME> GLOBAL EQUITY PORTFOLIO
<S> <C>
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<FISCAL-YEAR-END> DEC-31-1997
<PERIOD-END> DEC-31-1997
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
DEVELOPING GROWTH 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 11
<NAME> DEVELOPING GROWTH PORTFOLIO
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1997
<PERIOD-END> DEC-31-1997
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
DEAN WITTER SELECT DIMENSION INVESTMENT SERIES
EMERGING MARKETS 12/31/97
</LEGEND>
<CIK> 0000294394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 12
<NAME> EMERGING MARKETS PORTFOLIO
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1997
<PERIOD-END> DEC-31-1997
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<NUMBER-OF-SHARES-REDEEMED> (536332)
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
MID-CAP GROWTH 12/31/97
</LEGEND>
<CIK> 0000924394
<NAME> DEAN WITTER SELECT DIMENSIONS INVESTMENT SERIES
<SERIES>
<NUMBER> 13
<NAME> MID-CAP GROWTH PORTFOLIO
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1997
<PERIOD-END> DEC-31-1997
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</TABLE>