<PAGE> PAGE 1
000 A000000 05/31/99
000 C000000 0000887195
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 U
001 A000000 LORD ABBETT RESEARCH FUND, INC.
001 B000000 811-6650
001 C000000 2128481870
002 A000000 767 FIFTH AVENUE
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10153
002 D020000 0101
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 3
007 C010100 1
007 C020100 LORD ABBETT RESEARCH FUND,INC.-LARGE CAP SRS
007 C030100 N
007 C010200 2
007 C020200 LORD ABBETT GROWTH OPPORTUNITIES FUND
007 C030200 N
007 C010300 3
007 C020300 LORD ABBETT RESEARCH FUND,INC.-SMALL CAP SRS
007 C030300 N
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
011 A00AA01 LORD ABBETT DISTRIBUTOR LLC
011 B00AA01 8-216
011 C01AA01 NEW YORK
011 C02AA01 NY
011 C03AA01 10153
011 C04AA01 0101
018 00AA00 Y
019 A00AA00 Y
019 B00AA00 39
019 C00AA00 LORDABBETT
020 A000001 MERRILL LYNCH, PIERCE, FENER & SMITH, INC.
020 B000001 13-5674085
<PAGE> PAGE 2
020 C000001 23
020 A000002 SALOMON SMITH BARNEY
020 B000002 13-1912900
020 C000002 21
020 A000003 DONALDSON LUFKIN & JENRETE SECURITIES CORP.
020 B000003 13-2741729
020 C000003 10
020 A000004 RAGEN MACKENZIE, INC.
020 B000004 91-1374280
020 C000004 8
020 A000005 MORGAN STANLEY & CO. INC.
020 B000005 13-2655998
020 C000005 7
020 A000006 EDWARD JONES
020 B000006 43-0345811
020 C000006 7
020 A000007 SUNAMERICA SECURITIES
020 B000007 86-0273618
020 C000007 7
020 A000008 PERSHING
020 B000008 13-2741729
020 C000008 6
020 A000009 MONTGOMERY SECURITIES
020 B000009 94-1700676
020 C000009 5
020 A000010 GOLDMAN SACHS & CO. INC.
020 B000010 13-5108880
020 C000010 5
021 000000 789
022 A000001 MORGAN STANLEY & CO.INC.
022 B000001 13-2655998
022 C000001 939207
022 D000001 939207
022 A000002 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
022 B000002 13-5674085
022 C000002 318288
022 D000002 301082
022 A000003 DEAN WITTER REYNOLDS, INC.
022 B000003 94-1671384
022 C000003 186980
022 D000003 208227
022 A000004 FUJI SECURITIES, INC.
022 B000004 36-2880742
022 C000004 130005
022 D000004 136474
022 A000005 PRUDENTIAL-AMERICAN SECURITIES, INC.
022 B000005 13-5674085
022 C000005 97913
022 D000005 96123
022 A000006 AMERICAN EXPRESS FINANCIAL CORP.
022 B000006 11-1988350
<PAGE> PAGE 3
022 C000006 74147
022 D000006 74147
022 A000007 SALOMON BROTHERS,INC.
022 B000007 13-3082694
022 C000007 44120
022 D000007 42810
022 A000008 AMERICAN GENERAL SECURITIES, INC.
022 B000008 13-3553648
022 C000008 44120
022 D000008 42810
022 A000009 LEHAMN BROTHERS, INC.
022 B000009 13-2518466
022 C000009 21662
022 D000009 21662
022 C000010 0
022 D000010 0
023 C000000 1870649
023 D000000 1876760
062 A00AA00 N
062 B00AA00 0.0
062 C00AA00 0.0
062 D00AA00 0.0
062 E00AA00 0.0
062 F00AA00 0.0
062 G00AA00 0.0
062 H00AA00 0.0
062 I00AA00 0.0
062 J00AA00 0.0
062 K00AA00 0.0
062 L00AA00 0.0
062 M00AA00 0.0
062 N00AA00 0.0
062 O00AA00 0.0
062 P00AA00 0.0
062 Q00AA00 0.0
062 R00AA00 0.0
077 A000000 N
078 000000 N
080 A00AA00 ICI MUTUAL INSURANCE INC.
080 C00AA00 25000
081 A00AA00 Y
081 B00AA00 38
082 A00AA00 N
082 B00AA00 0
083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
086 A010000 0
<PAGE> PAGE 4
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
028 A010100 8140
028 A020100 1343
028 A030100 0
028 A040100 8263
028 B010100 7846
028 B020100 0
028 B030100 0
028 B040100 2213
028 C010100 8598
028 C020100 0
028 C030100 0
028 C040100 2305
028 D010100 11685
028 D020100 0
028 D030100 0
028 D040100 3158
028 E010100 10187
028 E020100 0
028 E030100 0
028 E040100 2559
028 F010100 10559
028 F020100 0
028 F030100 0
028 F040100 1847
028 G010100 57015
028 G020100 1343
028 G030100 0
028 G040100 20345
028 H000100 34254
029 000100 Y
030 A000100 893
030 B000100 5.75
030 C000100 0.00
031 A000100 128
031 B000100 0
032 000100 765
033 000100 0
034 000100 Y
035 000100 107
036 A000100 Y
<PAGE> PAGE 5
036 B000100 0
042 A000100 0
042 B000100 0
042 C000100 0
042 D000100 100
042 E000100 0
042 F000100 0
042 G000100 0
042 H000100 0
043 000100 418
044 000100 0
045 000100 Y
046 000100 N
047 000100 Y
048 000100 0.750
048 A010100 0
048 A020100 0.000
048 B010100 0
048 B020100 0.000
048 C010100 0
048 C020100 0.000
048 D010100 0
048 D020100 0.000
048 E010100 0
048 E020100 0.000
048 F010100 0
048 F020100 0.000
048 G010100 0
048 G020100 0.000
048 H010100 0
048 H020100 0.000
048 I010100 0
048 I020100 0.000
048 J010100 0
048 J020100 0.000
048 K010100 0
048 K020100 0.000
058 A000100 N
059 000100 Y
060 A000100 Y
060 B000100 Y
061 000100 1000
066 A000100 Y
066 B000100 N
066 C000100 N
066 D000100 N
066 E000100 Y
066 F000100 N
066 G000100 N
067 000100 N
068 A000100 N
<PAGE> PAGE 6
068 B000100 N
069 000100 N
071 A000100 91247
071 B000100 54830
071 C000100 163023
071 D000100 34
072 A000100 6
072 B000100 189
072 C000100 1222
072 D000100 0
072 E000100 0
072 F000100 630
072 G000100 0
072 H000100 0
072 I000100 188
072 J000100 0
072 K000100 0
072 L000100 29
072 M000100 1
072 N000100 35
072 O000100 5
072 P000100 0
072 Q000100 0
072 R000100 8
072 S000100 1
072 T000100 418
072 U000100 0
072 V000100 0
072 W000100 3
072 X000100 1318
072 Y000100 3
072 Z000100 96
072AA000100 6725
072BB000100 0
072CC010100 14494
072CC020100 0
072DD010100 308
072DD020100 0
072EE000100 1081
073 A010100 0.0700
073 A020100 0.0000
073 B000100 0.1700
073 C000100 0.0000
074 A000100 428
074 B000100 0
074 C000100 9247
074 D000100 0
074 E000100 0
074 F000100 191665
074 G000100 0
074 H000100 0
<PAGE> PAGE 7
074 I000100 0
074 J000100 9800
074 K000100 0
074 L000100 2690
074 M000100 54
074 N000100 213884
074 O000100 12592
074 P000100 0
074 Q000100 0
074 R010100 0
074 R020100 0
074 R030100 0
074 R040100 201
074 S000100 0
074 T000100 201091
074 U010100 5466
074 U020100 2218
074 V010100 24.69
074 V020100 24.46
074 W000100 0.0000
074 X000100 10635
074 Y000100 0
075 A000100 0
075 B000100 168854
076 000100 0.00
028 A010200 1349
028 A020200 0
028 A030200 0
028 A040200 197
028 B010200 741
028 B020200 0
028 B030200 0
028 B040200 51
028 C010200 1570
028 C020200 0
028 C030200 0
028 C040200 128
028 D010200 1938
028 D020200 0
028 D030200 0
028 D040200 126
028 E010200 2300
028 E020200 0
028 E030200 0
028 E040200 105
028 F010200 1702
028 F020200 0
028 F030200 0
028 F040200 135
028 G010200 9600
028 G020200 0
<PAGE> PAGE 8
028 G030200 0
028 G040200 742
028 H000200 7242
029 000200 Y
030 A000200 196
030 B000200 5.75
030 C000200 0.00
031 A000200 30
031 B000200 0
032 000200 166
033 000200 0
034 000200 N
035 000200 0
036 B000200 0
037 000200 N
038 000200 0
039 000200 Y
040 000200 Y
041 000200 Y
042 A000200 0
042 B000200 0
042 C000200 0
042 D000200 100
042 E000200 0
042 F000200 0
042 G000200 0
042 H000200 0
043 000200 14
044 000200 0
045 000200 Y
046 000200 N
047 000200 Y
048 000200 0.900
048 A010200 0
048 A020200 0.000
048 B010200 0
048 B020200 0.000
048 C010200 0
048 C020200 0.000
048 D010200 0
048 D020200 0.000
048 E010200 0
048 E020200 0.000
048 F010200 0
048 F020200 0.000
048 G010200 0
048 G020200 0.000
048 H010200 0
048 H020200 0.000
048 I010200 0
048 I020200 0.000
<PAGE> PAGE 9
048 J010200 0
048 J020200 0.000
048 K010200 0
048 K020200 0.000
058 A000200 N
059 000200 Y
060 A000200 Y
060 B000200 Y
061 000200 1000
066 A000200 Y
066 B000200 N
066 C000200 Y
066 D000200 N
066 E000200 N
066 F000200 N
066 G000200 N
067 000200 N
068 A000200 N
068 B000200 N
069 000200 N
071 A000200 13474
071 B000200 4390
071 C000200 8469
071 D000200 52
072 A000200 6
072 B000200 14
072 C000200 13
072 D000200 0
072 E000200 0
072 F000200 41
072 G000200 0
072 H000200 0
072 I000200 9
072 J000200 0
072 K000200 0
072 L000200 1
072 M000200 0
072 N000200 17
072 O000200 0
072 P000200 0
072 Q000200 0
072 R000200 0
072 S000200 5
072 T000200 14
072 U000200 0
072 V000200 0
072 W000200 1
072 X000200 88
072 Y000200 74
072 Z000200 13
072AA000200 556
<PAGE> PAGE 10
072BB000200 0
072CC010200 1017
072CC020200 0
072DD010200 0
072DD020200 0
072EE000200 0
073 A010200 0.0000
073 A020200 0.0000
073 B000200 0.0000
073 C000200 0.0000
074 A000200 17
074 B000200 0
074 C000200 0
074 D000200 0
074 E000200 0
074 F000200 15004
074 G000200 0
074 H000200 0
074 I000200 0
074 J000200 249
074 K000200 0
074 L000200 188
074 M000200 67
074 N000200 15525
074 O000200 358
074 P000200 0
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 0
074 S000200 0
074 T000200 15167
074 U010200 825
074 U020200 113
074 V010200 14.73
074 V020200 14.69
074 W000200 0.0000
074 X000200 1223
074 Y000200 0
075 A000200 0
075 B000200 9199
076 000200 0.00
028 A010300 5701
028 A020300 0
028 A030300 0
028 A040300 24058
028 B010300 6173
028 B020300 0
028 B030300 0
028 B040300 17640
<PAGE> PAGE 11
028 C010300 3568
028 C020300 0
028 C030300 0
028 C040300 20844
028 D010300 3511
028 D020300 0
028 D030300 0
028 D040300 28574
028 E010300 3697
028 E020300 0
028 E030300 0
028 E040300 21605
028 F010300 4420
028 F020300 0
028 F030300 0
028 F040300 9558
028 G010300 27070
028 G020300 0
028 G030300 0
028 G040300 122279
028 H000300 11189
029 000300 Y
030 A000300 199
030 B000300 5.75
030 C000300 0.00
031 A000300 27
031 B000300 0
032 000300 172
033 000300 0
034 000300 Y
035 000300 1037
036 A000300 Y
036 B000300 0
042 A000300 0
042 B000300 0
042 C000300 0
042 D000300 100
042 E000300 0
042 F000300 0
042 G000300 0
042 H000300 0
043 000300 1439
044 000300 0
045 000300 Y
046 000300 N
047 000300 Y
048 000300 0.750
048 A010300 0
048 A020300 0.000
048 B010300 0
048 B020300 0.000
<PAGE> PAGE 12
048 C010300 0
048 C020300 0.000
048 D010300 0
048 D020300 0.000
048 E010300 0
048 E020300 0.000
048 F010300 0
048 F020300 0.000
048 G010300 0
048 G020300 0.000
048 H010300 0
048 H020300 0.000
048 I010300 0
048 I020300 0.000
048 J010300 0
048 J020300 0.000
048 K010300 0
048 K020300 0.000
058 A000300 N
059 000300 Y
060 A000300 Y
060 B000300 Y
061 000300 1000
066 A000300 Y
066 B000300 N
066 C000300 Y
066 D000300 N
066 E000300 N
066 F000300 N
066 G000300 N
067 000300 N
068 A000300 N
068 B000300 N
069 000300 N
071 A000300 171588
071 B000300 262398
071 C000300 462819
071 D000300 37
072 A000300 6
072 B000300 170
072 C000300 1397
072 D000300 0
072 E000300 0
072 F000300 1812
072 G000300 0
072 H000300 0
072 I000300 735
072 J000300 0
072 K000300 0
072 L000300 69
072 M000300 4
<PAGE> PAGE 13
072 N000300 35
072 O000300 5
072 P000300 0
072 Q000300 0
072 R000300 26
072 S000300 2
072 T000300 1439
072 U000300 0
072 V000300 0
072 W000300 34
072 X000300 4161
072 Y000300 19
072 Z000300 -2575
072AA000300 18900
072BB000300 0
072CC010300 15703
072CC020300 0
072DD010300 0
072DD020300 0
072EE000300 0
073 A010300 0.0000
073 A020300 0.0000
073 B000300 0.0000
073 C000300 0.0000
074 A000300 211
074 B000300 0
074 C000300 9271
074 D000300 0
074 E000300 0
074 F000300 440863
074 G000300 0
074 H000300 0
074 I000300 0
074 J000300 15306
074 K000300 0
074 L000300 788
074 M000300 46
074 N000300 466485
074 O000300 13318
074 P000300 0
074 Q000300 0
074 R010300 0
074 R020300 0
074 R030300 0
074 R040300 970
074 S000300 0
074 T000300 452197
074 U010300 11816
074 U020300 11160
074 V010300 15.53
074 V020300 15.29
<PAGE> PAGE 14
074 W000300 0.0000
074 X000300 29521
074 Y000300 0
075 A000300 0
075 B000300 466506
076 000300 0.00
SIGNATURE JOSEPH VAN DAKE
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND - GROWTH OPPORTUNITIES FUND
<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> 13,536,454
<INVESTMENTS-AT-VALUE> 15,003,795
<RECEIVABLES> 436,874
<ASSETS-OTHER> 83,922
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 15,524,591
<PAYABLE-FOR-SECURITIES> 357,784
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 357,784
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 13,089,347
<SHARES-COMMON-STOCK> 825,227
<SHARES-COMMON-PRIOR> 333,167
<ACCUMULATED-NII-CURRENT> 12,842
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 597,277
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,467,341
<NET-ASSETS> 12,153,770
<DIVIDEND-INCOME> 12,812
<INTEREST-INCOME> 14,225
<OTHER-INCOME> 0
<EXPENSES-NET> 14,432
<NET-INVESTMENT-INCOME> 12,605
<REALIZED-GAINS-CURRENT> 555,859
<APPREC-INCREASE-CURRENT> 1,017,193
<NET-CHANGE-FROM-OPS> 1,585,657
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 535,900
<NUMBER-OF-SHARES-REDEEMED> (43,840)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 10,443,697
<ACCUMULATED-NII-PRIOR> 237
<ACCUMULATED-GAINS-PRIOR> 41,418
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 41,396
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 46,914
<AVERAGE-NET-ASSETS> 7,603,910
<PER-SHARE-NAV-BEGIN> 12.58
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 2.13
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.73
<EXPENSE-RATIO> 0.14
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND - GROWTH OPPORTUNITIES FUND
<SERIES>
<NUMBER> 022
<NAME> CLASS B
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 13,536,454
<INVESTMENTS-AT-VALUE> 15,003,795
<RECEIVABLES> 436,874
<ASSETS-OTHER> 83,922
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 15,524,591
<PAYABLE-FOR-SECURITIES> 357,784
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 357,784
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 13,089,347
<SHARES-COMMON-STOCK> 113,368
<SHARES-COMMON-PRIOR> 18,195
<ACCUMULATED-NII-CURRENT> 12,842
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 597,277
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,467,341
<NET-ASSETS> 1,665,214
<DIVIDEND-INCOME> 12,812
<INTEREST-INCOME> 14,225
<OTHER-INCOME> 0
<EXPENSES-NET> 14,432
<NET-INVESTMENT-INCOME> 12,605
<REALIZED-GAINS-CURRENT> 555,859
<APPREC-INCREASE-CURRENT> 1,017,193
<NET-CHANGE-FROM-OPS> 1,585,657
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 103,195
<NUMBER-OF-SHARES-REDEEMED> (8,022)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 10,443,697
<ACCUMULATED-NII-PRIOR> 237
<ACCUMULATED-GAINS-PRIOR> 41,418
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 41,396
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 46,914
<AVERAGE-NET-ASSETS> 854,892
<PER-SHARE-NAV-BEGIN> 12.57
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 2.13
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.69
<EXPENSE-RATIO> 0.42
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND - GROWTH OPPORTUNITIES FUND
<SERIES>
<NUMBER> 023
<NAME> CLASS C
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 13,536,454
<INVESTMENTS-AT-VALUE> 15,003,795
<RECEIVABLES> 436,874
<ASSETS-OTHER> 83,922
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 15,524,591
<PAYABLE-FOR-SECURITIES> 357,784
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 357,784
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 13,089,347
<SHARES-COMMON-STOCK> 91,646
<SHARES-COMMON-PRIOR> 24,003
<ACCUMULATED-NII-CURRENT> 12,842
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 597,277
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,467,341
<NET-ASSETS> 1,345,511
<DIVIDEND-INCOME> 12,812
<INTEREST-INCOME> 14,225
<OTHER-INCOME> 0
<EXPENSES-NET> 14,432
<NET-INVESTMENT-INCOME> 12,605
<REALIZED-GAINS-CURRENT> 555,859
<APPREC-INCREASE-CURRENT> 1,017,193
<NET-CHANGE-FROM-OPS> 1,585,657
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 71,508
<NUMBER-OF-SHARES-REDEEMED> (3,865)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 10,443,697
<ACCUMULATED-NII-PRIOR> 237
<ACCUMULATED-GAINS-PRIOR> 41,418
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 41,396
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 46,914
<AVERAGE-NET-ASSETS> 739,529
<PER-SHARE-NAV-BEGIN> 12.59
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 2.10
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.68
<EXPENSE-RATIO> 0.42
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND - GROWTH OPPORTUNITIES FUND
<SERIES>
<NUMBER> 024
<NAME> CLASS Y
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 13,536,454
<INVESTMENTS-AT-VALUE> 15,003,795
<RECEIVABLES> 436,874
<ASSETS-OTHER> 83,922
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 15,524,591
<PAYABLE-FOR-SECURITIES> 357,784
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 0
<TOTAL-LIABILITIES> 357,784
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 13,089,347
<SHARES-COMMON-STOCK> 157
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 12,842
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 597,277
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,467,341
<NET-ASSETS> 2,312
<DIVIDEND-INCOME> 12,812
<INTEREST-INCOME> 14,225
<OTHER-INCOME> 0
<EXPENSES-NET> 14,432
<NET-INVESTMENT-INCOME> 12,605
<REALIZED-GAINS-CURRENT> 555,859
<APPREC-INCREASE-CURRENT> 1,017,193
<NET-CHANGE-FROM-OPS> 1,585,657
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 157
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 10,443,697
<ACCUMULATED-NII-PRIOR> 237
<ACCUMULATED-GAINS-PRIOR> 41,418
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 41,396
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 46,914
<AVERAGE-NET-ASSETS> 852
<PER-SHARE-NAV-BEGIN> 12.76
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 1.93
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.73
<EXPENSE-RATIO> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.- LARGE-CAP 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> 158,560,717
<INVESTMENTS-AT-VALUE> 191,664,701
<RECEIVABLES> 12,490,282
<ASSETS-OTHER> 9,729,384
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 213,884,367
<PAYABLE-FOR-SECURITIES> 12,591,981
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 200,895
<TOTAL-LIABILITIES> 12,792,876
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 161,088,602
<SHARES-COMMON-STOCK> 5,465,791
<SHARES-COMMON-PRIOR> 4,596,041
<ACCUMULATED-NII-CURRENT> 67,436
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 6,831,469
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 33,103,984
<NET-ASSETS> 134,967,033
<DIVIDEND-INCOME> 1,221,694
<INTEREST-INCOME> 189,152
<OTHER-INCOME> 0
<EXPENSES-NET> 1,314,556
<NET-INVESTMENT-INCOME> 96,290
<REALIZED-GAINS-CURRENT> 6,724,656
<APPREC-INCREASE-CURRENT> 14,493,903
<NET-CHANGE-FROM-OPS> 21,314,849
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (307,606)
<DISTRIBUTIONS-OF-GAINS> (747,006)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,465,587
<NUMBER-OF-SHARES-REDEEMED> (643,664)
<SHARES-REINVESTED> 47,827
<NET-CHANGE-IN-ASSETS> 57,938,270
<ACCUMULATED-NII-PRIOR> 278,752
<ACCUMULATED-GAINS-PRIOR> 1,187,636
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 630,156
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,318,094
<AVERAGE-NET-ASSETS> 115,483,977
<PER-SHARE-NAV-BEGIN> 21.91
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 2.98
<PER-SHARE-DIVIDEND> (0.07)
<PER-SHARE-DISTRIBUTIONS> (0.17)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 24.69
<EXPENSE-RATIO> 0.66
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.- LARGE CAP 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> 158,560,717
<INVESTMENTS-AT-VALUE> 191,664,701
<RECEIVABLES> 12,490,282
<ASSETS-OTHER> 9,729,384
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 213,884,367
<PAYABLE-FOR-SECURITIES> 12,591,981
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 200,895
<TOTAL-LIABILITIES> 12,792,876
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 161,088,602
<SHARES-COMMON-STOCK> 2,218,165
<SHARES-COMMON-PRIOR> 1,600,267
<ACCUMULATED-NII-CURRENT> 67,436
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 6,831,469
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 33,103,984
<NET-ASSETS> 54,245,761
<DIVIDEND-INCOME> 1,221,694
<INTEREST-INCOME> 189,152
<OTHER-INCOME> 0
<EXPENSES-NET> 1,314,556
<NET-INVESTMENT-INCOME> 96,290
<REALIZED-GAINS-CURRENT> 6,724,656
<APPREC-INCREASE-CURRENT> 14,493,903
<NET-CHANGE-FROM-OPS> 21,314,849
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (307,606)
<DISTRIBUTIONS-OF-GAINS> (272,904)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 750,895
<NUMBER-OF-SHARES-REDEEMED> (144,959)
<SHARES-REINVESTED> 11,962
<NET-CHANGE-IN-ASSETS> 57,938,270
<ACCUMULATED-NII-PRIOR> 278,752
<ACCUMULATED-GAINS-PRIOR> 1,187,636
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 630,156
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,318,094
<AVERAGE-NET-ASSETS> 43,840,498
<PER-SHARE-NAV-BEGIN> 21.71
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 2.96
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (0.17)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 24.46
<EXPENSE-RATIO> 1.01
[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> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.- LARGE CAP SERIES CLASS C
<SERIES>
<NUMBER> 013
<NAME> CLASS C
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 158,560,717
<INVESTMENTS-AT-VALUE> 191,664,701
<RECEIVABLES> 12,490,282
<ASSETS-OTHER> 9,729,384
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 213,884,367
<PAYABLE-FOR-SECURITIES> 12,591,981
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 200,895
<TOTAL-LIABILITIES> 12,792,876
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 161,088,602
<SHARES-COMMON-STOCK> 485,460
<SHARES-COMMON-PRIOR> 354,770
<ACCUMULATED-NII-CURRENT> 67,436
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 6,831,469
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 33,103,984
<NET-ASSETS> 11,876,615
<DIVIDEND-INCOME> 1,221,694
<INTEREST-INCOME> 189,152
<OTHER-INCOME> 0
<EXPENSES-NET> 1,314,556
<NET-INVESTMENT-INCOME> 96,290
<REALIZED-GAINS-CURRENT> 6,724,656
<APPREC-INCREASE-CURRENT> 14,493,903
<NET-CHANGE-FROM-OPS> 21,314,849
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (307,606)
<DISTRIBUTIONS-OF-GAINS> (60,913)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 229,929
<NUMBER-OF-SHARES-REDEEMED> (102,010)
<SHARES-REINVESTED> 2,771
<NET-CHANGE-IN-ASSETS> 57,938,270
<ACCUMULATED-NII-PRIOR> 278,752
<ACCUMULATED-GAINS-PRIOR> 1,187,636
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 630,156
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,318,094
<AVERAGE-NET-ASSETS> 9,527,668
<PER-SHARE-NAV-BEGIN> 21.73
<PER-SHARE-NII> (0.05)
<PER-SHARE-GAIN-APPREC> 2.95
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (0.17)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 24.46
<EXPENSE-RATIO> 1.01
[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> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.- LARGE CAP SERIES
<SERIES>
<NUMBER> 014
<NAME> CLASS P
<S> <C>
<PERIOD-TYPE> 6-MOS
<PERIOD-START> APR-28-1999
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 158,560,717
<INVESTMENTS-AT-VALUE> 191,664,701
<RECEIVABLES> 12,490,282
<ASSETS-OTHER> 9,729,384
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 213,884,367
<PAYABLE-FOR-SECURITIES> 12,591,981
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 200,895
<TOTAL-LIABILITIES> 12,792,876
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 161,088,602
<SHARES-COMMON-STOCK> 45
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 67,436
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 6,831,469
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 33,103,984
<NET-ASSETS> 1,112
<DIVIDEND-INCOME> 1,221,694
<INTEREST-INCOME> 189,152
<OTHER-INCOME> 0
<EXPENSES-NET> 1,314,556
<NET-INVESTMENT-INCOME> 96,290
<REALIZED-GAINS-CURRENT> 6,724,656
<APPREC-INCREASE-CURRENT> 14,493,903
<NET-CHANGE-FROM-OPS> 21,314,849
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (307,606)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 45
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 57,938,270
<ACCUMULATED-NII-PRIOR> 278,752
<ACCUMULATED-GAINS-PRIOR> 1,187,636
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 630,156
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,318,094
<AVERAGE-NET-ASSETS> 1,136
<PER-SHARE-NAV-BEGIN> 25.09
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> (0.40)
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 24.70
<EXPENSE-RATIO> .14
[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> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.- LARGE CAP SERIES
<SERIES>
<NUMBER> 015
<NAME> CLASS Y
<S> <C>
<PERIOD-TYPE> 6-MOS
<PERIOD-START> MAY-04-1999
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 158,560,717
<INVESTMENTS-AT-VALUE> 191,664,701
<RECEIVABLES> 12,490,282
<ASSETS-OTHER> 9,729,384
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 213,884,367
<PAYABLE-FOR-SECURITIES> 12,591,981
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 200,895
<TOTAL-LIABILITIES> 12,792,876
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 161,088,602
<SHARES-COMMON-STOCK> 39
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 67,436
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 6,831,469
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 33,103,984
<NET-ASSETS> 970
<DIVIDEND-INCOME> 1,221,694
<INTEREST-INCOME> 189,152
<OTHER-INCOME> 0
<EXPENSES-NET> 1,314,556
<NET-INVESTMENT-INCOME> 96,290
<REALIZED-GAINS-CURRENT> 6,724,656
<APPREC-INCREASE-CURRENT> 14,493,903
<NET-CHANGE-FROM-OPS> 21,314,849
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (307,606)
<DISTRIBUTIONS-OF-GAINS> (60,913)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 39
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 57,938,270
<ACCUMULATED-NII-PRIOR> 278,752
<ACCUMULATED-GAINS-PRIOR> 1,187,636
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 630,156
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,318,094
<AVERAGE-NET-ASSETS> 992
<PER-SHARE-NAV-BEGIN> 25.21
<PER-SHARE-NII> 0
<PER-SHARE-GAIN-APPREC> (0.52)
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 24.69
<EXPENSE-RATIO> 0.08
[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> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.- SMALL-CAP VALUE SERIES
<SERIES>
<NUMBER> 031
<NAME> CLASS A
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 459,869,071
<INVESTMENTS-AT-VALUE> 440,862,561
<RECEIVABLES> 16,094,451
<ASSETS-OTHER> 9,528,420
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 466,485,432
<PAYABLE-FOR-SECURITIES> 13,318,429
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 969,780
<TOTAL-LIABILITIES> 14,288,209
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 485,261,238
<SHARES-COMMON-STOCK> 11,816,429
<SHARES-COMMON-PRIOR> 15,226,978
<ACCUMULATED-NII-CURRENT> (2,576,859)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (11,480,646)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (19,006,510)
<NET-ASSETS> 183,458,403
<DIVIDEND-INCOME> 1,397,491
<INTEREST-INCOME> 169,890
<OTHER-INCOME> 0
<EXPENSES-NET> 4,142,466
<NET-INVESTMENT-INCOME> (2,575,085)
<REALIZED-GAINS-CURRENT> 1,899,529
<APPREC-INCREASE-CURRENT> 15,702,841
<NET-CHANGE-FROM-OPS> 32,027,285
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 758,973
<NUMBER-OF-SHARES-REDEEMED> (4,169,522)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (95,208,935)
<ACCUMULATED-NII-PRIOR> (1,774)
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (30,380,175)
<GROSS-ADVISORY-FEES> 1,811,731
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,160,862
<AVERAGE-NET-ASSETS> 192,779,394
<PER-SHARE-NAV-BEGIN> 14.36
<PER-SHARE-NII> (0.06)
<PER-SHARE-GAIN-APPREC> 1.23
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.53
<EXPENSE-RATIO> 0.73
[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> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.- SMALL-CAP VALUE 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> 459,869,071
<INVESTMENTS-AT-VALUE> 440,862,561
<RECEIVABLES> 16,094,451
<ASSETS-OTHER> 9,528,420
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 466,485,432
<PAYABLE-FOR-SECURITIES> 13,318,429
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 969,780
<TOTAL-LIABILITIES> 14,288,209
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 485,261,238
<SHARES-COMMON-STOCK> 11,159,976
<SHARES-COMMON-PRIOR> 13,952,052
<ACCUMULATED-NII-CURRENT> (2,576,859)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (11,480,646)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (19,006,510)
<NET-ASSETS> 170,641,910
<DIVIDEND-INCOME> 1,397,491
<INTEREST-INCOME> 169,890
<OTHER-INCOME> 0
<EXPENSES-NET> 4,142,466
<NET-INVESTMENT-INCOME> (2,575,085)
<REALIZED-GAINS-CURRENT> 1,899,529
<APPREC-INCREASE-CURRENT> 15,702,841
<NET-CHANGE-FROM-OPS> 32,027,285
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 343,601
<NUMBER-OF-SHARES-REDEEMED> (3,135,677)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (95,208,935)
<ACCUMULATED-NII-PRIOR> (1,774)
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (30,380,175)
<GROSS-ADVISORY-FEES> 1,811,731
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,160,862
<AVERAGE-NET-ASSETS> 177,940,591
<PER-SHARE-NAV-BEGIN> 14.20
<PER-SHARE-NII> (0.11)
<PER-SHARE-GAIN-APPREC> 1.20
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.29
<EXPENSE-RATIO> 1.07
[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> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.- SMALL-CAP VALUE 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> 459,869,071
<INVESTMENTS-AT-VALUE> 440,862,561
<RECEIVABLES> 16,094,451
<ASSETS-OTHER> 9,528,420
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 466,485,432
<PAYABLE-FOR-SECURITIES> 13,318,429
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 969,780
<TOTAL-LIABILITIES> 14,288,209
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 485,261,238
<SHARES-COMMON-STOCK> 3,369,417
<SHARES-COMMON-PRIOR> 4,430,191
<ACCUMULATED-NII-CURRENT> (2,576,859)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (11,480,646)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (19,006,510)
<NET-ASSETS> 51,521,750
<DIVIDEND-INCOME> 1,397,491
<INTEREST-INCOME> 169,890
<OTHER-INCOME> 0
<EXPENSES-NET> 4,142,466
<NET-INVESTMENT-INCOME> (2,575,085)
<REALIZED-GAINS-CURRENT> 1,899,529
<APPREC-INCREASE-CURRENT> 15,702,841
<NET-CHANGE-FROM-OPS> 32,027,285
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 250,684
<NUMBER-OF-SHARES-REDEEMED> 1,311,458
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (95,208,935)
<ACCUMULATED-NII-PRIOR> (1,774)
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (30,380,175)
<GROSS-ADVISORY-FEES> 1,811,731
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,160,862
<AVERAGE-NET-ASSETS> 55,303,737
<PER-SHARE-NAV-BEGIN> 14.20
<PER-SHARE-NII> (0.11)
<PER-SHARE-GAIN-APPREC> 1.20
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.29
<EXPENSE-RATIO> 1.07
[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> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.- SMALL-CAP VALUE SERIES
<SERIES>
<NUMBER> 034
<NAME> CLASS Y
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> NOV-30-1999
<PERIOD-END> MAY-31-1999
<INVESTMENTS-AT-COST> 459,869,071
<INVESTMENTS-AT-VALUE> 440,862,561
<RECEIVABLES> 16,094,451
<ASSETS-OTHER> 9,528,420
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 466,485,432
<PAYABLE-FOR-SECURITIES> 13,318,429
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 969,780
<TOTAL-LIABILITIES> 14,288,209
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 485,261,238
<SHARES-COMMON-STOCK> 2,990,822
<SHARES-COMMON-PRIOR> 2,478,036
<ACCUMULATED-NII-CURRENT> (2,576,859)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (11,480,646)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (19,006,510)
<NET-ASSETS> 46,575,160
<DIVIDEND-INCOME> 1,397,491
<INTEREST-INCOME> 169,890
<OTHER-INCOME> 0
<EXPENSES-NET> 4,142,466
<NET-INVESTMENT-INCOME> (2,575,085)
<REALIZED-GAINS-CURRENT> 1,899,529
<APPREC-INCREASE-CURRENT> 15,702,841
<NET-CHANGE-FROM-OPS> 32,027,285
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 512,786
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (95,208,935)
<ACCUMULATED-NII-PRIOR> (1,774)
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> (30,380,175)
<GROSS-ADVISORY-FEES> 1,811,731
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,160,862
<AVERAGE-NET-ASSETS> 40,481,784
<PER-SHARE-NAV-BEGIN> 14.40
<PER-SHARE-NII> (0.04)
<PER-SHARE-GAIN-APPREC> 1.21
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.57
<EXPENSE-RATIO> 0.58
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
