LORD ABBETT INVESTMENT TRUST
NSAR-B, 2000-02-02
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<PAGE>      PAGE  1
000 B000000 11/30/1999
000 C000000 0000911507
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 LORD ABBETT INVESTMENT TRUST
001 B000000 811-7988
001 C000000 2013952851
002 A000000 90 HUDSON STREET
002 B000000 JERSEY CITY
002 C000000 NJ
002 D010000 07302
002 D020000 3973
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  6
007 C010100  1
007 C020100 US GOVERNMENT SECURITIES SERIES
007 C030100 N
007 C010200  2
007 C020200 LIMITED DURATION US GOV'T SECURITIES SERIES
007 C030200 N
007 C010300  3
007 C020300 BALANCED SERIES
007 C030300 N
007 C010400  4
007 C020400 CORE SERIES
007 C030400 N
007 C010500  5
007 C020500 HIGH YIELD
007 C030500 N
007 C010600  6
007 C020600 STRATEGIC CORE
007 C030600 N
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 LORD, ABBETT & CO.
008 B00AA01 A
008 C00AA01 801-6997
008 D01AA01 JERSEY CITY
008 D02AA01 NJ
008 D03AA01 07302
<PAGE>      PAGE  2
008 D04AA01 3973
011 A00AA01 LORD ABBETT DISTRIBUTOR LLC
011 B00AA01 8-216
011 C01AA01 JERSEY CITY
011 C02AA01 NJ
011 C03AA01 07302
011 C04AA01 3973
012 A00AA01 DST SYSTEMS, INC.
012 B00AA01 84-448
012 C01AA01 KANSAS CITY
012 C02AA01 MO
012 C03AA01 64141
013 A00AA01 DELOITTE & TOUCHE LLP
013 B01AA01 NEW YORK
013 B02AA01 NY
013 B03AA01 10048
015 A00AA01 THE BANK OF NEW YORK
015 B00AA01 C
015 C01AA01 NEW YORK
015 C02AA01 NY
015 C03AA01 10015
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
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019 C00AA00 LORDABBETT
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022 B000001 36-2880742
022 C000001   7429095
022 D000001   6282491
022 A000002 SALOMON BROTHERS, INC.
022 B000002 13-3082694
022 C000002   6542001
022 D000002   6389330
022 A000003 LEHMAN BROTHERS INC.
022 B000003 13-2518466
022 C000003   3145191
022 D000003   3004436
022 A000004 FREDDIE MAC. INC.
022 B000004 00-0000000
<PAGE>      PAGE  3
022 C000004   2669888
022 D000004   2747001
022 A000005 NOMURA SECURITIES INTERNATIONAL INC.
022 B000005 13-2642206
022 C000005   2525055
022 D000005   2181682
022 A000006 MORGAN STANLEY & CO.
022 B000006 13-2655998
022 C000006   1763156
022 D000006    740267
022 A000007 CREDIT SUISSE FIRST BOSTON CORP.
022 B000007 13-5659485
022 C000007    897977
022 D000007   1072231
022 A000008 JP MORGAN SECURITIES
022 B000008 13-3224016
022 C000008    547368
022 D000008    541852
022 A000009 BEAR STERNS & CO.
022 B000009 13-3299429
022 C000009    418081
022 D000009    413051
022 A000010 MERRILL LYNCH, PIERCE, FENNER & SMITH, INC.
022 B000010 13-5674085
022 C000010    241304
022 D000010    413051
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023 D000000   26763715
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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
033  000200      0
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039  000200 N
040  000200 Y
041  000200 Y
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050  000200 N
051  000200 N
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<PAGE>      PAGE  11
062 A000200 Y
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063 B000200  8.4
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066 A000200 N
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070 I020200 N
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<PAGE>      PAGE  12
070 M010200 N
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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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048 C010400        0
048 C020400 0.000
048 D010400        0
048 D020400 0.000
048 E010400        0
048 E020400 0.000
048 F010400        0
048 F020400 0.000
048 G010400        0
048 G020400 0.000
048 H010400        0
048 H020400 0.000
048 I010400        0
048 I020400 0.000
048 J010400        0
048 J020400 0.000
048 K010400        0
048 K020400 0.000
049  000400 N
050  000400 N
051  000400 N
052  000400 N
053 A000400 Y
062 A000400 Y
062 B000400   0.0
062 C000400   0.0
062 D000400   0.0
062 E000400   0.0
062 F000400   0.0
062 G000400   0.0
062 H000400   0.0
062 I000400   0.0
062 J000400   4.7
062 K000400   0.0
062 L000400   0.0
062 M000400   9.0
<PAGE>      PAGE  20
062 N000400 116.2
062 O000400   0.0
062 P000400   1.3
062 Q000400   6.8
062 R000400   0.0
063 A000400   0
063 B000400 12.8
064 A000400 N
064 B000400 N
066 A000400 N
067  000400 N
068 A000400 N
068 B000400 N
069  000400 N
070 A010400 Y
070 A020400 N
070 B010400 Y
070 B020400 N
070 C010400 Y
070 C020400 N
070 D010400 N
070 D020400 N
070 E010400 Y
070 E020400 N
070 F010400 N
070 F020400 N
070 G010400 N
070 G020400 N
070 H010400 N
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 N
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 N
070 M010400 Y
070 M020400 N
070 N010400 Y
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 N
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 N
070 R020400 N
071 A000400     45964
<PAGE>      PAGE  21
071 B000400     40828
071 C000400      9891
071 D000400  413
072 A000400 12
072 B000400      524
072 C000400        0
072 D000400        0
072 E000400        0
072 F000400        0
072 G000400        0
072 H000400        0
072 I000400        1
072 J000400        0
072 K000400        0
072 L000400        0
072 M000400        0
072 N000400        0
072 O000400        2
072 P000400        0
072 Q000400        0
072 R000400        3
072 S000400        1
072 T000400        0
072 U000400        0
072 V000400        0
072 W000400        3
072 X000400       10
072 Y000400       10
072 Z000400      524
072AA000400        0
072BB000400      202
072CC010400        0
072CC020400      238
072DD010400      277
072DD020400        0
072EE000400       81
073 A010400   0.4100
073 A020400   0.0000
073 B000400   0.1200
073 C000400   0.0000
074 A000400       21
074 B000400        0
074 C000400      410
074 D000400    11093
074 E000400        0
074 F000400        0
074 G000400        0
074 H000400        0
074 I000400        0
074 J000400      280
074 K000400        0
<PAGE>      PAGE  22
074 L000400       48
074 M000400        0
074 N000400    11852
074 O000400     2868
074 P000400        0
074 Q000400        0
074 R010400        0
074 R020400        0
074 R030400        0
074 R040400      271
074 S000400        0
074 T000400     8713
074 U010400      826
074 U020400        0
074 V010400    10.54
074 V020400     0.00
074 W000400   0.0000
074 X000400       14
074 Y000400        0
075 A000400        0
075 B000400     7923
076  000400     0.00
028 A010500      2247
028 A020500       126
028 A030500         0
028 A040500       365
028 B010500      2432
028 B020500       127
028 B030500         0
028 B040500       300
028 C010500       713
028 C020500       136
028 C030500         0
028 C040500       117
028 D010500      1319
028 D020500       140
028 D030500         0
028 D040500       292
028 E010500       844
028 E020500       144
028 E030500         0
028 E040500      1676
028 F010500      2514
028 F020500       151
028 F030500         0
028 F040500      1116
028 G010500     10069
028 G020500       824
028 G030500         0
028 G040500      3866
028 H000500      5051
<PAGE>      PAGE  23
029  000500 Y
030 A000500    310
030 B000500  4.75
030 C000500  0.00
031 A000500     33
031 B000500      0
032  000500    277
033  000500      0
034  000500 Y
035  000500     10
036 A000500 Y
036 B000500      0
037  000500 N
038  000500      0
039  000500 N
040  000500 Y
041  000500 Y
042 A000500   0
042 B000500   0
042 C000500   0
042 D000500 100
042 E000500   0
042 F000500   0
042 G000500   0
042 H000500   0
043  000500    138
044  000500      0
045  000500 Y
046  000500 N
047  000500 Y
048  000500  0.600
048 A010500        0
048 A020500 0.000
048 B010500        0
048 B020500 0.000
048 C010500        0
048 C020500 0.000
048 D010500        0
048 D020500 0.000
048 E010500        0
048 E020500 0.000
048 F010500        0
048 F020500 0.000
048 G010500        0
048 G020500 0.000
048 H010500        0
048 H020500 0.000
048 I010500        0
048 I020500 0.000
048 J010500        0
048 J020500 0.000
<PAGE>      PAGE  24
048 K010500        0
048 K020500 0.000
049  000500 N
050  000500 N
051  000500 N
052  000500 N
053 A000500 Y
062 A000500 Y
062 B000500   0.0
062 C000500   0.0
062 D000500   0.0
062 E000500   0.0
062 F000500   0.0
062 G000500   0.0
062 H000500   0.0
062 I000500   0.0
062 J000500   4.1
062 K000500   0.0
062 L000500   0.0
062 M000500   0.0
062 N000500   0.0
062 O000500   0.0
062 P000500  92.9
062 Q000500   0.0
062 R000500   0.0
063 A000500   0
063 B000500  5.4
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
<PAGE>      PAGE  25
070 I020500 N
070 J010500 Y
070 J020500 Y
070 K010500 Y
070 K020500 N
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     47753
071 B000500     20056
071 C000500     18304
071 D000500  110
072 A000500 12
072 B000500     1818
072 C000500        8
072 D000500        0
072 E000500        0
072 F000500        0
072 G000500        0
072 H000500        0
072 I000500       18
072 J000500        0
072 K000500        0
072 L000500        3
072 M000500        0
072 N000500       22
072 O000500        4
072 P000500        0
072 Q000500        0
072 R000500        3
072 S000500        2
072 T000500      138
072 U000500        0
072 V000500        0
072 W000500        3
072 X000500      193
072 Y000500       55
072 Z000500     1688
072AA000500        0
072BB000500      301
<PAGE>      PAGE  26
072CC010500        0
072CC020500      812
072DD010500      876
072DD020500      430
072EE000500        0
073 A010500   0.8500
073 A020500   0.7900
073 B000500   0.0000
073 C000500   0.0000
074 A000500      101
074 B000500        0
074 C000500     1175
074 D000500    26944
074 E000500        0
074 F000500        0
074 G000500        0
074 H000500        0
074 I000500        0
074 J000500        0
074 K000500        0
074 L000500      626
074 M000500        0
074 N000500    28846
074 O000500      114
074 P000500        0
074 Q000500        0
074 R010500        0
074 R020500        0
074 R030500        0
074 R040500       43
074 S000500        0
074 T000500    28689
074 U010500     1454
074 U020500      887
074 V010500     9.72
074 V020500     9.70
074 W000500   0.0000
074 X000500      617
074 Y000500        0
075 A000500        0
075 B000500    20615
076  000500     0.00
028 A010600         0
028 A020600         0
028 A030600         0
028 A040600         0
028 B010600         0
028 B020600         0
028 B030600         0
028 B040600         0
028 C010600         0
<PAGE>      PAGE  27
028 C020600         0
028 C030600         0
028 C040600         0
028 D010600         0
028 D020600         0
028 D030600         0
028 D040600         0
028 E010600         0
028 E020600         0
028 E030600         0
028 E040600         0
028 F010600         0
028 F020600         0
028 F030600         0
028 F040600         0
028 G010600         0
028 G020600         0
028 G030600         0
028 G040600         0
028 H000600         0
029  000600 Y
030 A000600      0
030 B000600  0.00
030 C000600  0.00
031 A000600      0
031 B000600      0
032  000600      0
033  000600      0
034  000600 Y
035  000600      0
036 A000600 Y
036 B000600      0
037  000600 N
038  000600      0
039  000600 N
040  000600 Y
041  000600 N
042 A000600   0
042 B000600   0
042 C000600   0
042 D000600   0
042 E000600   0
042 F000600   0
042 G000600   0
042 H000600   0
043  000600      0
044  000600      0
045  000600 Y
046  000600 N
047  000600 Y
048  000600  0.500
<PAGE>      PAGE  28
048 A010600        0
048 A020600 0.000
048 B010600        0
048 B020600 0.000
048 C010600        0
048 C020600 0.000
048 D010600        0
048 D020600 0.000
048 E010600        0
048 E020600 0.000
048 F010600        0
048 F020600 0.000
048 G010600        0
048 G020600 0.000
048 H010600        0
048 H020600 0.000
048 I010600        0
048 I020600 0.000
048 J010600        0
048 J020600 0.000
048 K010600        0
048 K020600 0.000
049  000600 N
050  000600 N
051  000600 N
052  000600 N
053 A000600 Y
062 A000600 Y
062 B000600   0.0
062 C000600   8.3
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   8.6
062 N000600 106.1
062 O000600   0.0
062 P000600   6.2
062 Q000600   2.8
062 R000600   0.0
063 A000600   0
063 B000600 11.2
066 A000600 N
067  000600 N
068 A000600 N
068 B000600 N
<PAGE>      PAGE  29
069  000600 N
070 A010600 Y
070 A020600 N
070 B010600 N
070 B020600 N
070 C010600 Y
070 C020600 N
070 D010600 N
070 D020600 N
070 E010600 Y
070 E020600 N
070 F010600 N
070 F020600 N
070 G010600 N
070 G020600 N
070 H010600 N
070 H020600 N
070 I010600 N
070 I020600 N
070 J010600 Y
070 J020600 N
070 K010600 Y
070 K020600 N
070 L010600 N
070 L020600 N
070 M010600 Y
070 M020600 N
070 N010600 Y
070 N020600 N
070 O010600 Y
070 O020600 N
070 P010600 N
070 P020600 N
070 Q010600 N
070 Q020600 N
070 R010600 N
070 R020600 N
071 A000600     13595
071 B000600     10833
071 C000600      2605
071 D000600  416
072 A000600 12
072 B000600      129
072 C000600        0
072 D000600        0
072 E000600        0
072 F000600        0
072 G000600        0
072 H000600        0
072 I000600        0
072 J000600        0
<PAGE>      PAGE  30
072 K000600        0
072 L000600        0
072 M000600        0
072 N000600        0
072 O000600        2
072 P000600        0
072 Q000600        0
072 R000600        3
072 S000600        1
072 T000600        0
072 U000600        0
072 V000600        0
072 W000600        3
072 X000600        9
072 Y000600        9
072 Z000600      129
072AA000600        0
072BB000600       58
072CC010600        0
072CC020600       44
072DD010600        0
072DD020600        0
072EE000600        0
073 A010600   0.0000
073 A020600   0.0000
073 B000600   0.0000
073 C000600   0.0000
074 A000600       25
074 B000600        0
074 C000600      174
074 D000600     2601
074 E000600        0
074 F000600        0
074 G000600        0
074 H000600        0
074 I000600        0
074 J000600       98
074 K000600        0
074 L000600       60
074 M000600        0
074 N000600     2958
074 O000600      855
074 P000600        0
074 Q000600        0
074 R010600        0
074 R020600        0
074 R030600        0
074 R040600        0
074 S000600        0
074 T000600     2103
074 U010600      208
<PAGE>      PAGE  31
074 U020600        0
074 V010600    10.13
074 V020600     0.00
074 W000600   0.0000
074 X000600        9
074 Y000600        0
075 A000600        0
075 B000600     2078
076  000600     0.00
SIGNATURE   DONNA M. MCMANUS
TITLE       TREASURER


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST, INC.
<SERIES>
   <NUMBER> 041
   <NAME> LORD ABBETT INVESTMENT TRUST - CORE - CLASS Y

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       11,675,313
<INVESTMENTS-AT-VALUE>                      11,502,988
<RECEIVABLES>                                  328,024
<ASSETS-OTHER>                                  20,824
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              11,851,836
<PAYABLE-FOR-SECURITIES>                     2,868,367
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      270,729
<TOTAL-LIABILITIES>                          3,139,096
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     8,577,055
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<SHARES-COMMON-PRIOR>                          427,854
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<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (202,994)
<ACCUM-APPREC-OR-DEPREC>                     (172,325)
<NET-ASSETS>                                 8,712,740
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              524,334
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                       0
<NET-INVESTMENT-INCOME>                        524,334
<REALIZED-GAINS-CURRENT>                     (201,653)
<APPREC-INCREASE-CURRENT>                    (237,677)
<NET-CHANGE-FROM-OPS>                           85,004
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (277,388)
<DISTRIBUTIONS-OF-GAINS>                      (81,187)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        383,951
<NUMBER-OF-SHARES-REDEEMED>                   (20,026)
<SHARES-REINVESTED>                             34,511
<NET-CHANGE-IN-ASSETS>                       4,018,599
<ACCUMULATED-NII-PRIOR>                        264,058
<ACCUMULATED-GAINS-PRIOR>                       79,846
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                      0
<AVERAGE-NET-ASSETS>                         7,922,952
<PER-SHARE-NAV-BEGIN>                            10.97
<PER-SHARE-NII>                                   0.69
<PER-SHARE-GAIN-APPREC>                         (0.59)
<PER-SHARE-DIVIDEND>                            (0.41)
<PER-SHARE-DISTRIBUTIONS>                       (0.12)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.54
<EXPENSE-RATIO>                                      0


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST, INC.
<SERIES>
   <NUMBER> 051
   <NAME> LORD ABBETT INVESTMENT TRUST - HIGH YIELD - CLASS A

<S>                             <C>
<PERIOD-TYPE>                   11-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-START>                             DEC-31-1998
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       28,930,569
<INVESTMENTS-AT-VALUE>                      28,118,955
<RECEIVABLES>                                  626,298
<ASSETS-OTHER>                                 100,647
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              28,845,900
<PAYABLE-FOR-SECURITIES>                       114,454
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       42,475
<TOTAL-LIABILITIES>                            156,929
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    29,768,902
<SHARES-COMMON-STOCK>                        1,454,162
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       32,880
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (301,197)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     (811,614)
<NET-ASSETS>                                14,133,125
<DIVIDEND-INCOME>                                8,594
<INTEREST-INCOME>                            1,818,026
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 138,334
<NET-INVESTMENT-INCOME>                      1,688,286
<REALIZED-GAINS-CURRENT>                     (301,197)
<APPREC-INCREASE-CURRENT>                    (811,614)
<NET-CHANGE-FROM-OPS>                          575,475
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (876,233)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,773,480
<NUMBER-OF-SHARES-REDEEMED>                  (389,093)
<SHARES-REINVESTED>                             69,775
<NET-CHANGE-IN-ASSETS>                      28,688,971
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                193,387
<AVERAGE-NET-ASSETS>                         9,759,024
<PER-SHARE-NAV-BEGIN>                            10.08
<PER-SHARE-NII>                                   0.83
<PER-SHARE-GAIN-APPREC>                         (0.34)
<PER-SHARE-DIVIDEND>                            (0.85)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.72
<EXPENSE-RATIO>                                   0.46


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST, INC.
<SERIES>
   <NUMBER> 052
   <NAME> LORD ABBETT INVESTMENT TRUST - HIGH YIELD - CLASS B

<S>                             <C>
<PERIOD-TYPE>                   11-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-START>                             DEC-31-1998
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       28,930,569
<INVESTMENTS-AT-VALUE>                      28,118,955
<RECEIVABLES>                                  626,298
<ASSETS-OTHER>                                 100,647
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              28,845,900
<PAYABLE-FOR-SECURITIES>                       114,454
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       42,475
<TOTAL-LIABILITIES>                            156,929
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    29,768,902
<SHARES-COMMON-STOCK>                          887,440
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       32,880
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (301,197)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     (811,614)
<NET-ASSETS>                                 8,609,577
<DIVIDEND-INCOME>                                8,594
<INTEREST-INCOME>                            1,818,026
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 138,334
<NET-INVESTMENT-INCOME>                      1,688,286
<REALIZED-GAINS-CURRENT>                     (301,197)
<APPREC-INCREASE-CURRENT>                    (811,614)
<NET-CHANGE-FROM-OPS>                          575,475
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (430,430)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,021,780
<NUMBER-OF-SHARES-REDEEMED>                  (161,478)
<SHARES-REINVESTED>                             27,138
<NET-CHANGE-IN-ASSETS>                      28,688,971
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                193,387
<AVERAGE-NET-ASSETS>                         5,070,925
<PER-SHARE-NAV-BEGIN>                            10.08
<PER-SHARE-NII>                                   0.78
<PER-SHARE-GAIN-APPREC>                         (0.37)
<PER-SHARE-DIVIDEND>                            (0.79)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.70
<EXPENSE-RATIO>                                   0.90


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST, INC.
<SERIES>
   <NUMBER> 053
   <NAME> LORD ABBETT INVESTMENT TRUST - HIGH YIELD - CLASS C

<S>                             <C>
<PERIOD-TYPE>                   11-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-START>                             DEC-31-1998
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       28,930,569
<INVESTMENTS-AT-VALUE>                      28,118,955
<RECEIVABLES>                                  626,298
<ASSETS-OTHER>                                 100,647
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              28,845,900
<PAYABLE-FOR-SECURITIES>                       114,454
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       42,475
<TOTAL-LIABILITIES>                            156,929
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    29,768,902
<SHARES-COMMON-STOCK>                          612,638
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       32,880
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (301,197)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     (811,614)
<NET-ASSETS>                                 5,945,149
<DIVIDEND-INCOME>                                8,594
<INTEREST-INCOME>                            1,818,026
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 138,334
<NET-INVESTMENT-INCOME>                      1,688,286
<REALIZED-GAINS-CURRENT>                     (301,197)
<APPREC-INCREASE-CURRENT>                    (811,614)
<NET-CHANGE-FROM-OPS>                          575,475
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (348,682)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        638,634
<NUMBER-OF-SHARES-REDEEMED>                   (48,021)
<SHARES-REINVESTED>                             22,025
<NET-CHANGE-IN-ASSETS>                      28,688,971
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                193,387
<AVERAGE-NET-ASSETS>                         4,072,447
<PER-SHARE-NAV-BEGIN>                            10.08
<PER-SHARE-NII>                                   0.78
<PER-SHARE-GAIN-APPREC>                         (0.37)
<PER-SHARE-DIVIDEND>                            (0.79)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.70
<EXPENSE-RATIO>                                   0.90


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST, INC.
<SERIES>
   <NUMBER> 054
   <NAME> LORD ABBETT INVESTMENT TRUST - HIGH YIELD - CLASS Y

<S>                             <C>
<PERIOD-TYPE>                   7-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-START>                             MAY-04-1998
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       28,930,569
<INVESTMENTS-AT-VALUE>                      28,118,955
<RECEIVABLES>                                  626,298
<ASSETS-OTHER>                                 100,647
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              28,845,900
<PAYABLE-FOR-SECURITIES>                       114,454
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       42,475
<TOTAL-LIABILITIES>                            156,929
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    29,768,902
<SHARES-COMMON-STOCK>                              115
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       32,880
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (301,197)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     (811,614)
<NET-ASSETS>                                     1,120
<DIVIDEND-INCOME>                                8,594
<INTEREST-INCOME>                            1,818,026
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 138,334
<NET-INVESTMENT-INCOME>                      1,688,286
<REALIZED-GAINS-CURRENT>                     (301,197)
<APPREC-INCREASE-CURRENT>                    (811,614)
<NET-CHANGE-FROM-OPS>                          575,475
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         (61)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            110
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  5
<NET-CHANGE-IN-ASSETS>                      28,688,971
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                193,387
<AVERAGE-NET-ASSETS>                             1,065
<PER-SHARE-NAV-BEGIN>                            10.36
<PER-SHARE-NII>                                   0.55
<PER-SHARE-GAIN-APPREC>                         (0.62)
<PER-SHARE-DIVIDEND>                            (0.56)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.73
<EXPENSE-RATIO>                                      0


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST
<SERIES>
   <NUMBER> 031
   <NAME> BALANCED SERIES - CLASS A

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      103,619,650
<INVESTMENTS-AT-VALUE>                      99,735,899
<RECEIVABLES>                                  658,798
<ASSETS-OTHER>                                  99,243
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             100,493,940
<PAYABLE-FOR-SECURITIES>                        33,131
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      330,342
<TOTAL-LIABILITIES>                            363,473
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    98,189,306
<SHARES-COMMON-STOCK>                        5,840,499
<SHARES-COMMON-PRIOR>                        3,471,843
<ACCUMULATED-NII-CURRENT>                      228,203
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      5,596,709
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   (3,883,751)
<NET-ASSETS>                                72,073,680
<DIVIDEND-INCOME>                            3,923,604
<INTEREST-INCOME>                               13,139
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 362,175
<NET-INVESTMENT-INCOME>                      3,574,568
<REALIZED-GAINS-CURRENT>                     5,616,227
<APPREC-INCREASE-CURRENT>                  (2,306,194)
<NET-CHANGE-FROM-OPS>                        6,884,601
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (2,628,685)
<DISTRIBUTIONS-OF-GAINS>                   (4,050,949)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,552,160
<NUMBER-OF-SHARES-REDEEMED>                  (729,757)
<SHARES-REINVESTED>                            546,253
<NET-CHANGE-IN-ASSETS>                      42,455,763
<ACCUMULATED-NII-PRIOR>                         40,055
<ACCUMULATED-GAINS-PRIOR>                    5,233,644
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                610,001
<AVERAGE-NET-ASSETS>                        60,471,720
<PER-SHARE-NAV-BEGIN>                            12.87
<PER-SHARE-NII>                                   0.54
<PER-SHARE-GAIN-APPREC>                           0.61
<PER-SHARE-DIVIDEND>                            (0.54)
<PER-SHARE-DISTRIBUTIONS>                       (1.14)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.34
<EXPENSE-RATIO>                                   0.25


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST
<SERIES>
   <NUMBER> 032
   <NAME> BALANCED SERIES - CLASS B

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      103,619,650
<INVESTMENTS-AT-VALUE>                      99,735,899
<RECEIVABLES>                                  658,798
<ASSETS-OTHER>                                  99,243
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             100,493,940
<PAYABLE-FOR-SECURITIES>                        33,131
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      330,342
<TOTAL-LIABILITIES>                            363,473
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    98,189,306
<SHARES-COMMON-STOCK>                        1,067,624
<SHARES-COMMON-PRIOR>                          396,867
<ACCUMULATED-NII-CURRENT>                      228,203
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      5,596,709
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   (3,883,751)
<NET-ASSETS>                                13,148,916
<DIVIDEND-INCOME>                            3,923,604
<INTEREST-INCOME>                               13,139
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 362,175
<NET-INVESTMENT-INCOME>                      3,574,568
<REALIZED-GAINS-CURRENT>                     5,616,227
<APPREC-INCREASE-CURRENT>                  (2,306,194)
<NET-CHANGE-FROM-OPS>                        6,884,601
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (356,628)
<DISTRIBUTIONS-OF-GAINS>                     (489,278)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        696,037
<NUMBER-OF-SHARES-REDEEMED>                   (91,703)
<SHARES-REINVESTED>                             66,423
<NET-CHANGE-IN-ASSETS>                      42,455,763
<ACCUMULATED-NII-PRIOR>                         40,055
<ACCUMULATED-GAINS-PRIOR>                    5,233,644
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                610,001
<AVERAGE-NET-ASSETS>                        10,021,730
<PER-SHARE-NAV-BEGIN>                            12.86
<PER-SHARE-NII>                                   0.52
<PER-SHARE-GAIN-APPREC>                           0.52
<PER-SHARE-DIVIDEND>                            (0.44)
<PER-SHARE-DISTRIBUTIONS>                       (1.14)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.32
<EXPENSE-RATIO>                                   1.00


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST
<SERIES>
   <NUMBER> 033
   <NAME> BALANCED SERIES - CLASS C

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      103,619,650
<INVESTMENTS-AT-VALUE>                      99,735,899
<RECEIVABLES>                                  658,798
<ASSETS-OTHER>                                  99,243
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             100,493,940
<PAYABLE-FOR-SECURITIES>                        33,131
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      330,342
<TOTAL-LIABILITIES>                            363,473
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    98,189,306
<SHARES-COMMON-STOCK>                        1,211,384
<SHARES-COMMON-PRIOR>                          614,958
<ACCUMULATED-NII-CURRENT>                      228,203
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      5,596,709
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                   (3,883,751)
<NET-ASSETS>                                14,907,871
<DIVIDEND-INCOME>                            3,923,604
<INTEREST-INCOME>                               13,139
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 362,175
<NET-INVESTMENT-INCOME>                      3,574,568
<REALIZED-GAINS-CURRENT>                     5,616,227
<APPREC-INCREASE-CURRENT>                  (2,306,194)
<NET-CHANGE-FROM-OPS>                        6,884,601
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (401,107)
<DISTRIBUTIONS-OF-GAINS>                     (712,935)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        679,267
<NUMBER-OF-SHARES-REDEEMED>                  (173,289)
<SHARES-REINVESTED>                             90,448
<NET-CHANGE-IN-ASSETS>                      42,455,763
<ACCUMULATED-NII-PRIOR>                         40,055
<ACCUMULATED-GAINS-PRIOR>                    5,233,644
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                610,001
<AVERAGE-NET-ASSETS>                        11,249,102
<PER-SHARE-NAV-BEGIN>                            12.85
<PER-SHARE-NII>                                   0.52
<PER-SHARE-GAIN-APPREC>                           0.52
<PER-SHARE-DIVIDEND>                            (0.44)
<PER-SHARE-DISTRIBUTIONS>                       (1.14)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.31
<EXPENSE-RATIO>                                   1.00


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST
<SERIES>
   <NUMBER> 021
   <NAME> LIMITED DURATION US GOVERNMENT SERIES - CLASS A

<S>                             <C>
<PERIOD-TYPE>                  12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       19,990,609
<INVESTMENTS-AT-VALUE>                      19,796,374
<RECEIVABLES>                                1,172,894
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              20,969,268
<PAYABLE-FOR-SECURITIES>                     4,431,615
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      288,626
<TOTAL-LIABILITIES>                          4,720,241
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    18,208,034
<SHARES-COMMON-STOCK>                        2,376,194
<SHARES-COMMON-PRIOR>                        1,278,737
<ACCUMULATED-NII-CURRENT>                      166,236
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (1,931,008)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     (194,235)
<NET-ASSETS>                                10,319,968
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              943,808
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  96,573
<NET-INVESTMENT-INCOME>                        847,235
<REALIZED-GAINS-CURRENT>                     (240,747)
<APPREC-INCREASE-CURRENT>                    (289,099)
<NET-CHANGE-FROM-OPS>                          317,389
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (472,868)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,793,591
<NUMBER-OF-SHARES-REDEEMED>                (1,759,526)
<SHARES-REINVESTED>                             63,392
<NET-CHANGE-IN-ASSETS>                       5,249,222
<ACCUMULATED-NII-PRIOR>                         51,920
<ACCUMULATED-GAINS-PRIOR>                  (1,690,261)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                129,137
<AVERAGE-NET-ASSETS>                         8,680,913
<PER-SHARE-NAV-BEGIN>                             4.46
<PER-SHARE-NII>                                   0.27
<PER-SHARE-GAIN-APPREC>                         (0.15)
<PER-SHARE-DIVIDEND>                            (0.24)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               4.34
<EXPENSE-RATIO>                                   0.32


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST
<SERIES>
   <NUMBER> 022
   <NAME> LIMITED DURATION US GOVERNMENT SERIES - CLASS C

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       19,990,609
<INVESTMENTS-AT-VALUE>                      19,796,374
<RECEIVABLES>                                1,172,894
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              20,969,268
<PAYABLE-FOR-SECURITIES>                     4,431,615
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      288,626
<TOTAL-LIABILITIES>                          4,720,241
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    18,208,034
<SHARES-COMMON-STOCK>                        1,369,343
<SHARES-COMMON-PRIOR>                        1,185,415
<ACCUMULATED-NII-CURRENT>                      166,236
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                    (1,931,008)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     (194,235)
<NET-ASSETS>                                 5,929,059
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              943,808
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  96,573
<NET-INVESTMENT-INCOME>                        847,235
<REALIZED-GAINS-CURRENT>                     (240,747)
<APPREC-INCREASE-CURRENT>                    (289,099)
<NET-CHANGE-FROM-OPS>                          317,389
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (260,051)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,153,772
<NUMBER-OF-SHARES-REDEEMED>                  (999,252)
<SHARES-REINVESTED>                             29,408
<NET-CHANGE-IN-ASSETS>                       5,249,222
<ACCUMULATED-NII-PRIOR>                         51,920
<ACCUMULATED-GAINS-PRIOR>                  (1,690,261)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                129,137
<AVERAGE-NET-ASSETS>                         5,821,391
<PER-SHARE-NAV-BEGIN>                             4.47
<PER-SHARE-NII>                                   0.23
<PER-SHARE-GAIN-APPREC>                         (0.17)
<PER-SHARE-DIVIDEND>                            (0.20)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               4.33
<EXPENSE-RATIO>                                   1.29


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST, INC.
<SERIES>
   <NUMBER> 061
   <NAME> LORD ABBETT INVESTMENT TRUST - STRATEGIC CORE - CLASS Y

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-START>                             DEC-14-1998
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                        2,819,291
<INVESTMENTS-AT-VALUE>                       2,774,890
<RECEIVABLES>                                  121,140
<ASSETS-OTHER>                                  61,594
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               2,957,624
<PAYABLE-FOR-SECURITIES>                       855,001
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                            0
<TOTAL-LIABILITIES>                            855,001
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     2,075,129
<SHARES-COMMON-STOCK>                          207,508
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                      129,447
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       (57,552)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      (44,401)
<NET-ASSETS>                                 2,102,623
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              129,447
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                       0
<NET-INVESTMENT-INCOME>                        129,447
<REALIZED-GAINS-CURRENT>                      (57,552)
<APPREC-INCREASE-CURRENT>                     (44,401)
<NET-CHANGE-FROM-OPS>                           27,494
<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>                       2,102,623
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                      0
<AVERAGE-NET-ASSETS>                         2,078,380
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                   0.62
<PER-SHARE-GAIN-APPREC>                         (0.49)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.13
<EXPENSE-RATIO>                                      0


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST, INC.
<SERIES>
   <NUMBER> 011
   <NAME> US GOVERNMENT SERIES - CLASS A

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                    1,966,793,377
<INVESTMENTS-AT-VALUE>                   1,924,619,596
<RECEIVABLES>                              158,170,221
<ASSETS-OTHER>                             115,060,076
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,197,849,893
<PAYABLE-FOR-SECURITIES>                   564,174,280
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                  128,085,541
<TOTAL-LIABILITIES>                        692,259,821
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 2,169,572,575
<SHARES-COMMON-STOCK>                      552,850,389
<SHARES-COMMON-PRIOR>                      648,149,209
<ACCUMULATED-NII-CURRENT>                  (6,938,931)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                  (614,869,791)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                  (42,173,781)
<NET-ASSETS>                             1,354,029,741
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          120,525,227
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              18,103,960
<NET-INVESTMENT-INCOME>                    102,421,267
<REALIZED-GAINS-CURRENT>                  (42,249,816)
<APPREC-INCREASE-CURRENT>                 (83,086,441)
<NET-CHANGE-FROM-OPS>                     (22,914,990)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                 (97,345,650)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     57,845,002
<NUMBER-OF-SHARES-REDEEMED>              (174,961,950)
<SHARES-REINVESTED>                         21,818,128
<NET-CHANGE-IN-ASSETS>                   (396,814,182)
<ACCUMULATED-NII-PRIOR>                    (2,391,920)
<ACCUMULATED-GAINS-PRIOR>                (572,619,975)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        8,529,176
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             18,427,240
<AVERAGE-NET-ASSETS>                     1,534,643,379
<PER-SHARE-NAV-BEGIN>                             2.64
<PER-SHARE-NII>                                   0.15
<PER-SHARE-GAIN-APPREC>                         (0.18)
<PER-SHARE-DIVIDEND>                            (0.16)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               2.45
<EXPENSE-RATIO>                                   1.02


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST, INC.
<SERIES>
   <NUMBER> 012
   <NAME> US GOVERNMENT SERIES - CLASS B

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                    1,966,793,377
<INVESTMENTS-AT-VALUE>                   1,924,619,596
<RECEIVABLES>                              158,170,221
<ASSETS-OTHER>                             115,060,076
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,197,849,893
<PAYABLE-FOR-SECURITIES>                   564,174,280
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                  128,085,541
<TOTAL-LIABILITIES>                        692,259,821
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 2,169,572,575
<SHARES-COMMON-STOCK>                       13,531,794
<SHARES-COMMON-PRIOR>                       11,100,263
<ACCUMULATED-NII-CURRENT>                  (6,938,931)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                  (614,869,791)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                  (42,173,781)
<NET-ASSETS>                                33,181,077
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          120,525,227
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              18,103,960
<NET-INVESTMENT-INCOME>                    102,421,267
<REALIZED-GAINS-CURRENT>                  (42,249,816)
<APPREC-INCREASE-CURRENT>                 (83,086,441)
<NET-CHANGE-FROM-OPS>                     (22,914,990)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (1,803,475)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      6,206,611
<NUMBER-OF-SHARES-REDEEMED>                (4,118,711)
<SHARES-REINVESTED>                            343,631
<NET-CHANGE-IN-ASSETS>                   (396,814,182)
<ACCUMULATED-NII-PRIOR>                    (2,391,920)
<ACCUMULATED-GAINS-PRIOR>                (572,619,975)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        8,529,176
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             18,427,240
<AVERAGE-NET-ASSETS>                        32,089,057
<PER-SHARE-NAV-BEGIN>                             2.64
<PER-SHARE-NII>                                   0.14
<PER-SHARE-GAIN-APPREC>                         (0.19)
<PER-SHARE-DIVIDEND>                            (0.14)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               2.45
<EXPENSE-RATIO>                                   1.69


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911507
<NAME> LORD ABBETT INVESTMENT TRUST, INC.
<SERIES>
   <NUMBER> 013
   <NAME> US GOVERNMENT SERIES - CLASS C

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                    1,966,793,377
<INVESTMENTS-AT-VALUE>                   1,924,619,596
<RECEIVABLES>                              158,170,221
<ASSETS-OTHER>                             115,060,076
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                           2,197,849,893
<PAYABLE-FOR-SECURITIES>                   564,174,280
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                  128,085,541
<TOTAL-LIABILITIES>                        692,259,821
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                 2,169,572,575
<SHARES-COMMON-STOCK>                       48,238,869
<SHARES-COMMON-PRIOR>                       60,767,078
<ACCUMULATED-NII-CURRENT>                  (6,938,931)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                  (614,869,791)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                  (42,173,781)
<NET-ASSETS>                               118,379,254
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                          120,525,227
<OTHER-INCOME>                                       0
<EXPENSES-NET>                              18,103,960
<NET-INVESTMENT-INCOME>                    102,421,267
<REALIZED-GAINS-CURRENT>                  (42,249,816)
<APPREC-INCREASE-CURRENT>                 (83,086,441)
<NET-CHANGE-FROM-OPS>                     (22,914,990)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                  (7,819,153)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      3,744,749
<NUMBER-OF-SHARES-REDEEMED>               (17,811,371)
<SHARES-REINVESTED>                          1,538,413
<NET-CHANGE-IN-ASSETS>                   (396,814,182)
<ACCUMULATED-NII-PRIOR>                    (2,391,920)
<ACCUMULATED-GAINS-PRIOR>                (572,619,975)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        8,529,176
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                             18,427,240
<AVERAGE-NET-ASSETS>                       138,821,114
<PER-SHARE-NAV-BEGIN>                             2.65
<PER-SHARE-NII>                                   0.14
<PER-SHARE-GAIN-APPREC>                         (0.20)
<PER-SHARE-DIVIDEND>                            (0.14)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               2.45
<EXPENSE-RATIO>                                   1.64


</TABLE>


Independent Auditors' Report

To the Board of Trustees and Shareholders,
Lord Abbett Investment Trust:

We have  audited  the  accompanying  statements  of net  assets  of Lord  Abbett
Investment  Trust - Core Fixed  Income  Series and  Strategic  Core Fixed Income
Series as of November 30, 1999,  the related  statements  of  operations  and of
changes in net assets and the financial  highlights  for the periods  presented.
These financial  statements and the financial  highlights are the responsibility
of the Trust's management.  Our responsibility is to express an opinion on these
financial statements and financial highlights based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about  whether the  financial  statements  and  financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements. Our procedures included confirmation of securities owned at November
30, 1999 by  correspondence  with the custodian and brokers;  where replies were
not received from brokers, we performed other auditing procedures. An audit also
includes assessing the accounting principles used and significant estimates made
by  management,   as  well  as  evaluating  the  overall   financial   statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  such  financial  statements  and financial  highlights  present
fairly,  in all  material  respects,  the  financial  position  of  Lord  Abbett
Investment  Trust - Core Fixed  Income  Series and  Strategic  Core Fixed Income
Series at November 30,  1999,  the results of their  operations,  the changes in
their net assets and their financial  highlights for the periods  presented,  in
conformity with generally accepted accounting principles.






Independent Auditors' Report

To the Board of Trustees and Shareholders,
Lord Abbett Investment Trust:

We have  audited  the  accompanying  statements  of net  assets  of Lord  Abbett
Investment  Trust - U.S.  Government  Securities  Series,  Limited Duration U.S.
Government  Securities  Series,  Balanced  Series,  and  High  Yield  Fund as of
November 30, 1999, the related  statements of operations for the year then ended
and of changes in net assets for each of the years in the  two-year  period then
ended,  and the financial  highlights for each of the periods  presented.  These
financial  statements and the financial highlights are the responsibility of the
Trust's  management.  Our  responsibility  is to  express  an  opinion  on these
financial statements and the financial highlights based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about  whether the  financial  statements  and  financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements. Our procedures included confirmation of securities owned at November
30, 1999 by  correspondence  with the custodian and brokers;  where replies were
not received from brokers, we performed other auditing procedures. An audit also
includes assessing the accounting principles used and significant estimates made
by  management,   as  well  as  evaluating  the  overall   financial   statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  such  financial  statements  and financial  highlights  present
fairly,  in all  material  respects,  the  financial  position  of  Lord  Abbett
Investment  Trust - U.S.  Government  Securities  Series,  Limited Duration U.S.
Government  Securities Series,  Balanced Series, and High Yield Fund at November
30, 1999, the results of their  operations,  the changes in their net assets and
their financial  highlights for each of the periods presented in conformity with
generally accepted accounting principles.



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