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<PAGE> PAGE 2
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<PAGE> PAGE 9
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<PAGE> PAGE 11
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<PAGE> PAGE 13
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<PAGE> PAGE 15
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<PAGE> PAGE 19
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<PAGE> PAGE 20
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010 A000501 DIMENSIONAL FUND ADVISORS INC.
010 B000501 801-162830
010 C010501 SANTA MONICA
010 C020501 CA
010 C030501 90401
012 A000501 PFPC, INC.
012 B000501 85-825
012 C010501 WILMINGTON
012 C020501 DE
012 C030501 19809
015 A000501 PFPC TRUST COMPANY
015 B000501 C
015 C010501 WILMINGTON
015 C020501 DE
015 C030501 19809
015 E010501 X
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028 A020500 0
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<PAGE> PAGE 21
028 C020500 0
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045 000500 N
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<PAGE> PAGE 22
062 H000500 0.0
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063 A000500 0
063 B000500 0.0
066 A000500 N
067 000500 N
068 A000500 N
068 B000500 Y
069 000500 N
070 A010500 Y
070 A020500 N
070 B010500 N
070 B020500 N
070 C010500 N
070 C020500 N
070 D010500 Y
070 D020500 N
070 E010500 N
070 E020500 N
070 F010500 Y
070 F020500 N
070 G010500 Y
070 G020500 N
070 H010500 Y
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 N
070 K010500 Y
070 K020500 Y
070 L010500 Y
070 L020500 N
070 M010500 Y
070 M020500 N
070 N010500 Y
070 N020500 N
070 O010500 Y
070 O020500 N
070 P010500 Y
070 P020500 N
070 Q010500 N
<PAGE> PAGE 23
070 Q020500 N
070 R010500 N
070 R020500 N
071 A000500 0
071 B000500 0
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072 A000500 12
072 B000500 0
072 C000500 0
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<PAGE> PAGE 24
074 H000500 0
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008 A000601 DIMENSIONAL FUND ADVISORS INC.
008 B000601 A
008 C000601 801-162830
008 D010601 SANTA MONICA
008 D020601 CA
008 D030601 90401
010 A000601 PFPC, INC.
010 B000601 85-1196
010 C010601 WILMINGTON
010 C020601 DE
010 C030601 19809
012 A000601 PFPC, INC.
012 B000601 85-825
012 C010601 WILMINGTON
012 C020601 DE
012 C030601 19809
015 A000601 PFPC TRUST COMPANY
015 B000601 C
015 C010601 WILMINGTON
015 C020601 DE
015 C030601 19809
015 E010601 X
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<PAGE> PAGE 25
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<PAGE> PAGE 26
048 K020600 0.000
049 000600 N
050 000600 N
051 000600 N
052 000600 N
053 A000600 N
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064 A000600 N
064 B000600 N
066 A000600 N
067 000600 N
068 A000600 N
068 B000600 N
069 000600 N
070 A010600 Y
070 A020600 Y
070 B010600 N
070 B020600 N
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070 C020600 N
070 D010600 N
070 D020600 N
070 E010600 N
070 E020600 N
070 F010600 N
070 F020600 N
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070 G020600 N
070 H010600 N
070 H020600 N
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<PAGE> PAGE 27
070 J010600 Y
070 J020600 N
070 K010600 N
070 K020600 N
070 L010600 N
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070 O010600 Y
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070 Q020600 N
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<PAGE> PAGE 28
072CC020600 1947
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010 A000801 DIMENSIONAL FUND ADVISORS INC.
010 B000801 801-162830
010 C010801 SANTA MONICA
010 C020801 CA
010 C030801 90401
012 A000801 PFPC, INC.
012 B000801 85-825
012 C010801 WILMINGTON
012 C020801 DE
012 C030801 19809
<PAGE> PAGE 29
015 A000801 PFPC TRUST COMPANY
015 B000801 C
015 C010801 WILMINGTON
015 C020801 DE
015 C030801 19809
015 E010801 X
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<PAGE> PAGE 30
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070 D010800 Y
070 D020800 N
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070 E020800 N
070 F010800 Y
070 F020800 N
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<PAGE> PAGE 31
070 J010800 Y
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<PAGE> PAGE 32
072CC020800 36037
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010 A000901 DIMENSIONAL FUND ADVISORS INC.
010 B000901 801-162830
010 C010901 SANTA MONICA
010 C020901 CA
010 C030901 90401
012 A000901 PFPC, INC.
012 B000901 85-825
012 C010901 WILMINGTON
012 C020901 DE
012 C030901 19809
<PAGE> PAGE 33
015 A000901 PFPC TRUST COMPANY
015 B000901 C
015 C010901 WILMINGTON
015 C020901 DE
015 C030901 19809
015 E010901 X
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<PAGE> PAGE 34
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066 A000900 N
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070 A010900 Y
070 A020900 N
070 B010900 N
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070 D010900 N
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070 E020900 N
070 F010900 Y
070 F020900 N
070 G010900 Y
070 G020900 N
070 H010900 Y
070 H020900 N
070 I010900 N
070 I020900 N
<PAGE> PAGE 35
070 J010900 N
070 J020900 N
070 K010900 Y
070 K020900 Y
070 L010900 N
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070 M010900 N
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070 N010900 Y
070 N020900 N
070 O010900 Y
070 O020900 N
070 P010900 Y
070 P020900 N
070 Q010900 N
070 Q020900 N
070 R010900 N
070 R020900 N
071 A000900 0
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<PAGE> PAGE 36
072CC020900 0
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008 A001001 DIMENSIONAL FUND ADVISORS INC.
008 B001001 A
008 C001001 801-162830
008 D011001 SANTA MONICA
008 D021001 CA
008 D031001 90401
010 A001001 PFPC, INC.
010 B001001 85-1196
010 C011001 WILMINGTON
010 C021001 DE
<PAGE> PAGE 37
010 C031001 19809
012 A001001 PFPC, INC.
012 B001001 85-825
012 C011001 WILMINGTON
012 C021001 DE
012 C031001 19809
015 A001001 PFPC TRUST COMPANY
015 B001001 C
015 C011001 WILMINGTON
015 C021001 DE
015 C031001 19809
015 E011001 X
028 A011000 4280
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<PAGE> PAGE 38
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048 K021000 0.000
049 001000 N
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051 001000 N
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<PAGE> PAGE 39
070 B021000 N
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071 A001000 69467
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<PAGE> PAGE 40
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<PAGE> PAGE 41
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<PAGE> PAGE 42
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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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<PAGE> PAGE 47
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<PAGE> PAGE 48
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<PAGE> PAGE 49
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<PAGE> PAGE 50
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<PAGE> PAGE 51
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<PAGE> PAGE 52
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<PAGE> PAGE 53
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010 A001401 DIMENSIONAL FUND ADVISORS INC.
010 B001401 801-162830
010 C011401 SANTA MONICA
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<PAGE> PAGE 54
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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 A001501 DIMENSIONAL FUND ADVISORS INC.
008 B001501 A
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008 D011501 SANTA MONICA
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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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<PAGE> PAGE 61
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<PAGE> PAGE 62
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<PAGE> PAGE 63
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<PAGE> PAGE 64
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<PAGE> PAGE 65
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<PAGE> PAGE 66
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<PAGE> PAGE 67
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<PAGE> PAGE 68
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<PAGE> PAGE 69
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<PAGE> PAGE 70
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<PAGE> PAGE 71
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<PAGE> PAGE 72
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<PAGE> PAGE 73
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<PAGE> PAGE 74
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<PAGE> PAGE 75
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<PAGE> PAGE 76
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<PAGE> PAGE 77
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<PAGE> PAGE 78
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<PAGE> PAGE 79
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<PAGE> PAGE 80
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<PAGE> PAGE 81
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<PAGE> PAGE 82
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<PAGE> PAGE 83
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<PAGE> PAGE 84
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<PAGE> PAGE 85
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<PAGE> PAGE 86
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<PAGE> PAGE 87
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<PAGE> PAGE 88
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<PAGE> PAGE 89
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<PAGE> PAGE 90
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<PAGE> PAGE 91
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<PAGE> PAGE 92
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<PAGE> PAGE 93
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<PAGE> PAGE 94
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<PAGE> PAGE 95
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<PAGE> PAGE 96
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<PAGE> PAGE 97
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<PAGE> PAGE 98
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<PAGE> PAGE 99
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<PAGE> PAGE 100
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<PAGE> PAGE 101
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<PAGE> PAGE 102
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<PAGE> PAGE 103
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<PAGE> PAGE 104
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<PAGE> PAGE 105
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<PAGE> PAGE 106
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<PAGE> PAGE 107
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<PAGE> PAGE 108
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<PAGE> PAGE 109
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<PAGE> PAGE 110
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<PAGE> PAGE 111
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<PAGE> PAGE 112
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<PAGE> PAGE 113
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<PAGE> PAGE 114
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<PAGE> PAGE 115
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<PAGE> PAGE 116
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<PAGE> PAGE 117
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<PAGE> PAGE 118
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<PAGE> PAGE 119
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<PAGE> PAGE 120
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<PAGE> PAGE 121
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<PAGE> PAGE 122
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<PAGE> PAGE 123
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<PAGE> PAGE 124
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<PAGE> PAGE 127
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<PAGE> PAGE 129
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<PAGE> PAGE 131
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<PAGE> PAGE 137
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<PAGE> PAGE 139
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<PAGE> PAGE 140
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<PAGE> PAGE 141
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<PAGE> PAGE 142
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<PAGE> PAGE 143
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<PAGE> PAGE 144
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<PAGE> PAGE 145
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<PAGE> PAGE 146
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<PAGE> PAGE 147
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<PAGE> PAGE 148
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<PAGE> PAGE 149
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<PAGE> PAGE 150
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<PAGE> PAGE 151
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<PAGE> PAGE 152
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<PAGE> PAGE 153
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<PAGE> PAGE 154
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<PAGE> PAGE 156
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<PAGE> PAGE 157
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<PAGE> PAGE 158
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<PAGE> PAGE 159
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SIGNATURE MARY JANE MALONEY
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EXHIBIT INDEX
Exhibit A: Attachment to item 77B:
Accountants report on internal control
- -------------------------------------------------------
Exhibit A:
To the Board of Directors of
DFA Investment Dimensions Group Inc.:
In planning and performing our audit of the financial
statements and financial highlights of DFA Investment
Dimensions Group Inc. (consisting of The U.S. 9-10 Small
Company Portfolio, The U.S. 6-10 Small Company Portfolio,
The U.S. Large Cap Value Portfolio, The Enhanced U.S. Large
Company Portfolio, The U.S. 6-10 Value Portfolio, The U.S.
Large Company Portfolio, The DFA Real Estate Securities
Portfolio, The Japanese Small Company Portfolio, The Pacific
Rim Small Company Portfolio, The United Kingdom Small
Company Portfolio, The Emerging Markets Portfolio, The
RWB/DFA International High Book to Market Portfolio, The
Emerging Markets Small Cap Portfolio, The Continental Small
Company Portfolio, The Large Cap International Portfolio,
The DFA International Small Cap Value Portfolio, The
International Small Company Portfolio, The Emerging Markets
Value Portfolio, The DFA One-Year Fixed Income Portfolio,
The DFA Two-Year Global Fixed Income Portfolio, The DFA
Five-Year Government Portfolio, The DFA Global Fixed Income
Portfolio, The DFA Intermediate Government Fixed Income
Portfolio, The Tax-Managed U.S. Marketwide Value Portfolio,
The Tax-Managed U.S. 5-10 Value Portfolio, The Tax-Managed
U.S. 6-10 Small Company Portfolio, The Tax-Managed DFA
International Value Portfolio, The VA Small Value Portfolio,
The VA Large Value Portfolio, The VA International Value
Portfolio, The VA International Small Portfolio, The VA
Short-Term Fixed Portfolio and The VA Global Bond Portfolio)
for the year ended November 30, 1999, we considered each
portfolio's 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 financial highlights
and to comply with the requirements of Form N-SAR, not to
provide assurance on internal control.
The management of DFA Investment Dimensions Group Inc. 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 and financial
highlights 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, error
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 it may become inadequate because of
changes in conditions or that the effectiveness of the
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 and
financial highlights 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 over safeguarding securities,
that we consider to be material weaknesses as defined above
as of November 30, 1999.
This report is intended solely for the information and use
of management, the Board of Directors of DFA Investment
Dimensions Group Inc. and the Securities and Exchange
Commission.
PricewaterhouseCoopers, LLP
Philadelphia, Pennsylvania
January 14, 2000
