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062 O000500 0.0
062 P000500 0.0
062 Q000500 97.4
062 R000500 0.0
063 A000500 0
063 B000500 8.3
064 A000500 N
064 B000500 N
066 A000500 N
067 000500 N
068 A000500 N
068 B000500 N
069 000500 N
070 A010500 Y
070 A020500 N
070 B010500 N
070 B020500 N
070 C010500 Y
070 C020500 N
070 D010500 N
070 D020500 N
070 E010500 Y
070 E020500 N
070 F010500 N
070 F020500 N
070 G010500 N
070 G020500 N
070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 Y
070 K010500 Y
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<PAGE> PAGE 22
070 L010500 Y
070 L020500 Y
070 M010500 N
070 M020500 N
070 N010500 Y
070 N020500 N
070 O010500 Y
070 O020500 N
070 P010500 N
070 P020500 N
070 Q010500 N
070 Q020500 N
070 R010500 N
070 R020500 N
071 A000500 32493
071 B000500 10397
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072 A000500 6
072 B000500 499
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072AA000500 80
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<PAGE> PAGE 23
073 A010500 0.3900
073 A020500 0.3600
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073 C000500 0.0000
074 A000500 90
074 B000500 0
074 C000500 0
074 D000500 21817
074 E000500 0
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074 G000500 0
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074 L000500 886
074 M000500 0
074 N000500 25534
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028 A010600 2075
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<PAGE> PAGE 24
028 D030600 0
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028 G010600 2075
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<PAGE> PAGE 25
048 F010600 0
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048 I010600 0
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062 A000600 Y
062 B000600 0.0
062 C000600 1.1
062 D000600 0.0
062 E000600 0.0
062 F000600 0.0
062 G000600 0.0
062 H000600 0.0
062 I000600 0.0
062 J000600 0.0
062 K000600 0.0
062 L000600 0.0
062 M000600 21.3
062 N000600 88.5
062 O000600 0.0
062 P000600 0.0
062 Q000600 12.6
062 R000600 0.0
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063 B000600 12.7
066 A000600 N
067 000600 N
068 A000600 N
068 B000600 N
069 000600 N
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070 A020600 N
070 B010600 N
070 B020600 N
070 C010600 Y
070 C020600 N
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070 D020600 N
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070 E020600 N
070 F010600 N
070 F020600 N
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070 G020600 N
<PAGE> PAGE 26
070 H010600 N
070 H020600 N
070 I010600 N
070 I020600 N
070 J010600 Y
070 J020600 N
070 K010600 Y
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070 L020600 N
070 M010600 Y
070 M020600 N
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070 N020600 N
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070 O020600 N
070 P010600 N
070 P020600 N
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070 Q020600 N
070 R010600 N
070 R020600 N
071 A000600 7689
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<PAGE> PAGE 27
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SIGNATURE JOSEPH VAN DYKE
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - BALANCED SERIES
<SERIES>
<NUMBER> 031
<NAME> CLASS A
<S> <C>
<PERIOD-TYPE> 6-MOS
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<PERIOD-END> MAY-31-1999
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<INVESTMENTS-AT-VALUE> 82,211,294
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<ACCUM-APPREC-OR-DEPREC> 2,143,606
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<DIVIDEND-INCOME> 1,633,708
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<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,176,424)
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<NUMBER-OF-SHARES-REDEEMED> 337,301
<SHARES-REINVESTED> 433,222
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - BALANCED SERIES
<SERIES>
<NUMBER> 032
<NAME> CLASS B
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 80,067,688
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - BALANCED SERIES
<SERIES>
<NUMBER> 033
<NAME> CLASS C
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 80,067,688
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<EXPENSE-RATIO> 0.50
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - CORE SERIES
<SERIES>
<NUMBER> 041
<NAME> CLASS Y
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 9,442,474
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<NET-INVESTMENT-INCOME> 210,251
<REALIZED-GAINS-CURRENT> (23,634)
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</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - HIGH YIELD FUND
<SERIES>
<NUMBER> 051
<NAME> CLASS A
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-START> DEC-01-1998
<PERIOD-END> MAY-31-1999
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - HIGH YIELD FUND
<SERIES>
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<PERIOD-END> MAY-31-1999
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<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 54,771
<AVERAGE-NET-ASSETS> 2,864,833
<PER-SHARE-NAV-BEGIN> 10.08
<PER-SHARE-NII> 0.40
<PER-SHARE-GAIN-APPREC> (0.14)
<PER-SHARE-DIVIDEND> (0.36)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.98
<EXPENSE-RATIO> 0.46
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - HIGH YEILD FUND
<SERIES>
<NUMBER> 053
<NAME> CLASS C
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-START> DEC-01-1998
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 22,256,381
<INVESTMENTS-AT-VALUE> 21,816,960
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<TOTAL-LIABILITIES> 3,144,498
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<ACCUMULATED-NET-GAINS> 79,880
<OVERDISTRIBUTION-GAINS> (439,421)
<ACCUM-APPREC-OR-DEPREC> 22,389,468
<NET-ASSETS> 5,102,004
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 498,704
<OTHER-INCOME> 0
<EXPENSES-NET> 33,859
<NET-INVESTMENT-INCOME> 464,845
<REALIZED-GAINS-CURRENT> 79,880
<APPREC-INCREASE-CURRENT> (439,421)
<NET-CHANGE-FROM-OPS> 105,304
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (102,793)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 507,043
<NUMBER-OF-SHARES-REDEEMED> 2,048
<SHARES-REINVESTED> 5,899
<NET-CHANGE-IN-ASSETS> 22,389,468
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 33,950
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 54,771
<AVERAGE-NET-ASSETS> 2,528,573
<PER-SHARE-NAV-BEGIN> 10.08
<PER-SHARE-NII> 0.40
<PER-SHARE-GAIN-APPREC> (0.13)
<PER-SHARE-DIVIDEND> (0.36)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.99
<EXPENSE-RATIO> 0.46
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - HIGH YEILD FUND
<SERIES>
<NUMBER> 054
<NAME> CLASS Y
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-START> DEC-01-1998
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 22,256,381
<INVESTMENTS-AT-VALUE> 21,816,960
<RECEIVABLES> 3,611,724
<ASSETS-OTHER> 105,282
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<TOTAL-ASSETS> 25,533,966
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<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 22,366
<TOTAL-LIABILITIES> 3,144,498
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 22,743,801
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<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 5,208
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<ACCUMULATED-NET-GAINS> 79,880
<OVERDISTRIBUTION-GAINS> (439,421)
<ACCUM-APPREC-OR-DEPREC> 22,389,468
<NET-ASSETS> 973
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 498,704
<OTHER-INCOME> 0
<EXPENSES-NET> 33,859
<NET-INVESTMENT-INCOME> 464,845
<REALIZED-GAINS-CURRENT> 79,880
<APPREC-INCREASE-CURRENT> (439,421)
<NET-CHANGE-FROM-OPS> 105,304
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (8)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 96
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 1
<NET-CHANGE-IN-ASSETS> 22,389,468
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 33,950
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 54,771
<AVERAGE-NET-ASSETS> 983
<PER-SHARE-NAV-BEGIN> 10.36
<PER-SHARE-NII> 0.06
<PER-SHARE-GAIN-APPREC> (0.42)
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.00
<EXPENSE-RATIO> 0
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - LIMITED DURATION
<SERIES>
<NUMBER> 021
<NAME> CLASS A
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 17,549,763
<INVESTMENTS-AT-VALUE> 17,432,241
<RECEIVABLES> 1,342,146
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<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 19,695,689
<PAYABLE-FOR-SECURITIES> 4,381,348
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 84,913
<TOTAL-LIABILITIES> 4,466,261
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<PAID-IN-CAPITAL-COMMON> 16,935,764
<SHARES-COMMON-STOCK> 1,990,490
<SHARES-COMMON-PRIOR> 1,278,737
<ACCUMULATED-NII-CURRENT> 102,345
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<ACCUMULATED-NET-GAINS> (1,691,159)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (117,522)
<NET-ASSETS> 8,779,137
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 429,294
<OTHER-INCOME> 0
<EXPENSES-NET> 49,710
<NET-INVESTMENT-INCOME> 379,584
<REALIZED-GAINS-CURRENT> (898)
<APPREC-INCREASE-CURRENT> (212,386)
<NET-CHANGE-FROM-OPS> 166,300
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (212,068)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,312,872
<NUMBER-OF-SHARES-REDEEMED> 632,554
<SHARES-REINVESTED> 31,435
<NET-CHANGE-IN-ASSETS> 4,229,623
<ACCUMULATED-NII-PRIOR> 51,920
<ACCUMULATED-GAINS-PRIOR> (1,690,261)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 33,869
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 64,618
<AVERAGE-NET-ASSETS> 8,084,685
<PER-SHARE-NAV-BEGIN> 4.46
<PER-SHARE-NII> 0.13
<PER-SHARE-GAIN-APPREC> (0.06)
<PER-SHARE-DIVIDEND> (0.12)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 4.41
<EXPENSE-RATIO> 0.18
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - LIMITED DURATION
<SERIES>
<NUMBER> 022
<NAME> CLASS C
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 17,549,763
<INVESTMENTS-AT-VALUE> 17,432,241
<RECEIVABLES> 1,342,146
<ASSETS-OTHER> 921,302
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 19,695,689
<PAYABLE-FOR-SECURITIES> 4,381,348
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<OTHER-ITEMS-LIABILITIES> 84,913
<TOTAL-LIABILITIES> 4,466,261
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 16,935,764
<SHARES-COMMON-STOCK> 1,466,441
<SHARES-COMMON-PRIOR> 1,185,415
<ACCUMULATED-NII-CURRENT> 102,345
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1,691,159)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (117,522)
<NET-ASSETS> 6,450,291
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 429,294
<OTHER-INCOME> 0
<EXPENSES-NET> 49,710
<NET-INVESTMENT-INCOME> 379,584
<REALIZED-GAINS-CURRENT> (898)
<APPREC-INCREASE-CURRENT> (212,386)
<NET-CHANGE-FROM-OPS> 166,300
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (117,091)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 523,302
<NUMBER-OF-SHARES-REDEEMED> 259,170
<SHARES-REINVESTED> 16,894
<NET-CHANGE-IN-ASSETS> 4,229,623
<ACCUMULATED-NII-PRIOR> 51,920
<ACCUMULATED-GAINS-PRIOR> (1,690,261)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 33,869
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 64,618
<AVERAGE-NET-ASSETS> 5,462,947
<PER-SHARE-NAV-BEGIN> 4.47
<PER-SHARE-NII> 0.11
<PER-SHARE-GAIN-APPREC> (0.08)
<PER-SHARE-DIVIDEND> (0.10)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 4.40
<EXPENSE-RATIO> 0.64
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - STRATEGIC CORE SERIES
<SERIES>
<NUMBER> 061
<NAME> CLASS Y
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 2,580,617
<INVESTMENTS-AT-VALUE> 2,538,520
<RECEIVABLES> 342,581
<ASSETS-OTHER> 235,592
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3,116,693
<PAYABLE-FOR-SECURITIES> 1,044,502
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 1,044,502
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 2,075,129
<SHARES-COMMON-STOCK> 207,508
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 56,129
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (16,969)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (42,098)
<NET-ASSETS> 2,072,191
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 56,129
<OTHER-INCOME> 0
<EXPENSES-NET> 0
<NET-INVESTMENT-INCOME> 56,129
<REALIZED-GAINS-CURRENT> (16,969)
<APPREC-INCREASE-CURRENT> 42,098
<NET-CHANGE-FROM-OPS> 2,938
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 207,508
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 2,072,191
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5,194
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 5,194
<AVERAGE-NET-ASSETS> 2,083,176
<PER-SHARE-NAV-BEGIN> 10.00
<PER-SHARE-NII> 0.27
<PER-SHARE-GAIN-APPREC> (0.28)
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.99
<EXPENSE-RATIO> 0
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - US GOV'T SECURITIES SERIES
<SERIES>
<NUMBER> 011
<NAME> CLASS A
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 1,987,756,851
<INVESTMENTS-AT-VALUE> 1,967,004,588
<RECEIVABLES> 271,874,011
<ASSETS-OTHER> 91,000,000
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3,229,878,598
<PAYABLE-FOR-SECURITIES> 602,781,421
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 18,650,306
<TOTAL-LIABILITIES> 621,431,727
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 2,316,227,535
<SHARES-COMMON-STOCK> 606,127,691
<SHARES-COMMON-PRIOR> 648,149,209
<ACCUMULATED-NII-CURRENT> (13,625,152)
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<ACCUMULATED-NET-GAINS> (573,403,249)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (20,752,263)
<NET-ASSETS> 1,537,365,526
<DIVIDEND-INCOME> 0
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<EXPENSES-NET> 9,349,077
<NET-INVESTMENT-INCOME> 44,146,246
<REALIZED-GAINS-CURRENT> (783,274)
<APPREC-INCREASE-CURRENT> (61,664,923)
<NET-CHANGE-FROM-OPS> (18,301,951)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 50,416,169
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 29,771,335
<NUMBER-OF-SHARES-REDEEMED> (83,152,054)
<SHARES-REINVESTED> 11,359,201
<NET-CHANGE-IN-ASSETS> 0
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (572,619,975)
<OVERDISTRIB-NII-PRIOR> (2,391,920)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4,598,042
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 9,546,876
<AVERAGE-NET-ASSETS> 1,638,980,759
<PER-SHARE-NAV-BEGIN> 2.64
<PER-SHARE-NII> 0.06
<PER-SHARE-GAIN-APPREC> (0.08)
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<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 2.54
<EXPENSE-RATIO> 0.49
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - US GOV'T SECURITIES SERIES
<SERIES>
<NUMBER> 012
<NAME> CLASS B
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 1,987,756,851
<INVESTMENTS-AT-VALUE> 1,967,004,588
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<PAYABLE-FOR-SECURITIES> 602,781,421
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<OTHER-ITEMS-LIABILITIES> 18,650,306
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<PAID-IN-CAPITAL-COMMON> 2,316,227,535
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<SHARES-COMMON-PRIOR> 11,100,263
<ACCUMULATED-NII-CURRENT> (13,625,152)
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<DISTRIBUTIONS-OF-INCOME> 852,444
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<NUMBER-OF-SHARES-SOLD> 3,393,082
<NUMBER-OF-SHARES-REDEEMED> (2,283,715)
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<ACCUMULATED-GAINS-PRIOR> (572,619,975)
<OVERDISTRIB-NII-PRIOR> (2,391,920)
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<GROSS-ADVISORY-FEES> 4,598,042
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<GROSS-EXPENSE> 9,546,876
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<PER-SHARE-NAV-BEGIN> 2.64
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> (0.08)
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<EXPENSE-RATIO> 0.84
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST - US GOV'T SECURITIES SERIES
<SERIES>
<NUMBER> 013
<NAME> CLASS C
<S> <C>
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<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 1,987,756,851
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<PAID-IN-CAPITAL-COMMON> 2,316,227,535
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<SHARES-COMMON-PRIOR> 60,767,078
<ACCUMULATED-NII-CURRENT> (13,625,152)
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<NUMBER-OF-SHARES-REDEEMED> (9,066,387)
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<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 2.54
<EXPENSE-RATIO> 0.81
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
