LORD ABBETT RESEARCH FUND INC
NSAR-B, 2000-01-31
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<PAGE>      PAGE  1
000 B000000 11/30/1999
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SIGNATURE   DONNA MCMANUS
TITLE       TREASURER


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
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   <NAME> LORD ABBETT RESEARCH FUND - LARGE CAP SERIES - CLASS A

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<PER-SHARE-DIVIDEND>                            (0.10)
<PER-SHARE-DISTRIBUTIONS>                       (0.17)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              25.32
<EXPENSE-RATIO>                                   1.43


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
<SERIES>
   <NUMBER> 012
   <NAME> LORD ABBETT RESEARCH FUND - LARGE CAP SERIES - CLASS B

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      223,592,726
<INVESTMENTS-AT-VALUE>                     255,631,188
<RECEIVABLES>                                1,797,495
<ASSETS-OTHER>                                 134,571
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             257,563,254
<PAYABLE-FOR-SECURITIES>                     1,051,398
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      508,661
<TOTAL-LIABILITIES>                          1,560,059
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   210,421,354
<SHARES-COMMON-STOCK>                        2,740,741
<SHARES-COMMON-PRIOR>                        1,600,267
<ACCUMULATED-NII-CURRENT>                       12,582
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     13,530,797
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    32,038,462
<NET-ASSETS>                                68,589,678
<DIVIDEND-INCOME>                            3,085,453
<INTEREST-INCOME>                              424,620
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               3,298,165
<NET-INVESTMENT-INCOME>                        211,908
<REALIZED-GAINS-CURRENT>                    13,423,990
<APPREC-INCREASE-CURRENT>                   13,428,381
<NET-CHANGE-FROM-OPS>                       27,064,279
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (172)
<DISTRIBUTIONS-OF-GAINS>                     (272,906)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,429,541
<NUMBER-OF-SHARES-REDEEMED>                  (301,029)
<SHARES-REINVESTED>                             11,962
<NET-CHANGE-IN-ASSETS>                     112,849,974
<ACCUMULATED-NII-PRIOR>                        278,752
<ACCUMULATED-GAINS-PRIOR>                    1,187,636
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,498,289
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,306,570
<AVERAGE-NET-ASSETS>                        52,734,434
<PER-SHARE-NAV-BEGIN>                            21.71
<PER-SHARE-NII>                                 (0.09)
<PER-SHARE-GAIN-APPREC>                           3.58
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (0.17)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              25.03
<EXPENSE-RATIO>                                   2.11


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
<SERIES>
   <NUMBER> 013
   <NAME> LORD ABBETT RESEARCH FUND - LARGE CAP SERIES - CLASS C

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      223,592,726
<INVESTMENTS-AT-VALUE>                     255,631,188
<RECEIVABLES>                                1,797,495
<ASSETS-OTHER>                                 134,571
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             257,563,254
<PAYABLE-FOR-SECURITIES>                     1,051,398
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      508,661
<TOTAL-LIABILITIES>                          1,560,059
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   210,421,354
<SHARES-COMMON-STOCK>                          701,353
<SHARES-COMMON-PRIOR>                          354,770
<ACCUMULATED-NII-CURRENT>                       12,582
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     13,530,797
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    32,038,462
<NET-ASSETS>                                17,567,174
<DIVIDEND-INCOME>                            3,085,453
<INTEREST-INCOME>                              424,620
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               3,298,165
<NET-INVESTMENT-INCOME>                        211,908
<REALIZED-GAINS-CURRENT>                    13,423,990
<APPREC-INCREASE-CURRENT>                   13,428,381
<NET-CHANGE-FROM-OPS>                       27,064,279
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         (40)
<DISTRIBUTIONS-OF-GAINS>                      (60,913)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        502,800
<NUMBER-OF-SHARES-REDEEMED>                  (158,988)
<SHARES-REINVESTED>                              2,771
<NET-CHANGE-IN-ASSETS>                     112,849,974
<ACCUMULATED-NII-PRIOR>                        278,752
<ACCUMULATED-GAINS-PRIOR>                    1,187,636
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,498,289
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,306,570
<AVERAGE-NET-ASSETS>                        12,178,679
<PER-SHARE-NAV-BEGIN>                            21.73
<PER-SHARE-NII>                                 (0.09)
<PER-SHARE-GAIN-APPREC>                           3.58
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (0.17)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              25.05
<EXPENSE-RATIO>                                   2.11


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
<SERIES>
   <NUMBER> 014
   <NAME> LORD ABBETT RESEARCH FUND - LARGE CAP SERIES - CLASS P

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<PERIOD-START>                             APR-28-1999
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      223,592,726
<INVESTMENTS-AT-VALUE>                     255,631,188
<RECEIVABLES>                                1,797,495
<ASSETS-OTHER>                                 134,571
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             257,563,254
<PAYABLE-FOR-SECURITIES>                     1,051,398
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      508,661
<TOTAL-LIABILITIES>                          1,560,059
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   210,421,354
<SHARES-COMMON-STOCK>                               45
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       12,582
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     13,530,797
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    32,038,462
<NET-ASSETS>                                     1,148
<DIVIDEND-INCOME>                            3,085,453
<INTEREST-INCOME>                              424,620
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               3,298,165
<NET-INVESTMENT-INCOME>                        211,908
<REALIZED-GAINS-CURRENT>                    13,423,990
<APPREC-INCREASE-CURRENT>                   13,428,381
<NET-CHANGE-FROM-OPS>                       27,064,279
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          (1)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                             45
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                     112,849,974
<ACCUMULATED-NII-PRIOR>                        278,752
<ACCUMULATED-GAINS-PRIOR>                    1,187,636
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,498,289
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,306,570
<AVERAGE-NET-ASSETS>                             1,131
<PER-SHARE-NAV-BEGIN>                            25.09
<PER-SHARE-NII>                                   0.09
<PER-SHARE-GAIN-APPREC>                           0.21
<PER-SHARE-DIVIDEND>                            (0.03)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              25.36
<EXPENSE-RATIO>                                    .92


</TABLE>

<TABLE> <S> <C>


<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
<SERIES>
   <NUMBER> 015
   <NAME> LORD ABBETT RESEARCH FUND - LARGE CAP SERIES - CLASS Y

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<PERIOD-START>                             MAY-04-1999
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      223,592,726
<INVESTMENTS-AT-VALUE>                     255,631,188
<RECEIVABLES>                                1,797,495
<ASSETS-OTHER>                                 134,571
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             257,563,254
<PAYABLE-FOR-SECURITIES>                     1,051,398
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      508,661
<TOTAL-LIABILITIES>                          1,560,059
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   210,421,354
<SHARES-COMMON-STOCK>                               44
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                       12,582
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                     13,530,797
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    32,038,462
<NET-ASSETS>                                     1,122
<DIVIDEND-INCOME>                            3,085,453
<INTEREST-INCOME>                              424,620
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               3,298,165
<NET-INVESTMENT-INCOME>                        211,908
<REALIZED-GAINS-CURRENT>                    13,423,990
<APPREC-INCREASE-CURRENT>                   13,428,381
<NET-CHANGE-FROM-OPS>                       27,064,279
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          (2)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                             44
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                     112,849,974
<ACCUMULATED-NII-PRIOR>                        278,752
<ACCUMULATED-GAINS-PRIOR>                    1,187,636
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        1,498,289
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              3,306,570
<AVERAGE-NET-ASSETS>                             1,071
<PER-SHARE-NAV-BEGIN>                            25.21
<PER-SHARE-NII>                                   0.04
<PER-SHARE-GAIN-APPREC>                           0.09
<PER-SHARE-DIVIDEND>                            (0.04)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              25.30
<EXPENSE-RATIO>                                    .63


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND
<SERIES>
   <NUMBER> 021
   <NAME> LORD ABBETT RESEARCH FUND - GROWTH OPPORTUNITIES - CLASS A

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       49,576,746
<INVESTMENTS-AT-VALUE>                      60,392,191
<RECEIVABLES>                                2,465,187
<ASSETS-OTHER>                                 339,504
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              63,196,882
<PAYABLE-FOR-SECURITIES>                     3,475,656
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       73,738
<TOTAL-LIABILITIES>                          3,549,394
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    47,264,858
<SHARES-COMMON-STOCK>                        2,130,826
<SHARES-COMMON-PRIOR>                          333,167
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      1,549,900
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    10,815,445
<NET-ASSETS>                                40,252,412
<DIVIDEND-INCOME>                               54,435
<INTEREST-INCOME>                               63,717
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 101,105
<NET-INVESTMENT-INCOME>                         17,047
<REALIZED-GAINS-CURRENT>                     1,508,482
<APPREC-INCREASE-CURRENT>                   10,365,297
<NET-CHANGE-FROM-OPS>                       11,890,826
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      2,010,484
<NUMBER-OF-SHARES-REDEEMED>                  (212,825)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      54,924,378
<ACCUMULATED-NII-PRIOR>                            237
<ACCUMULATED-GAINS-PRIOR>                       41,418
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                159,531
<AVERAGE-NET-ASSETS>                        13,508,639
<PER-SHARE-NAV-BEGIN>                            12.58
<PER-SHARE-NII>                                   0.04
<PER-SHARE-GAIN-APPREC>                           6.27
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              18.89
<EXPENSE-RATIO>                                   0.41


</TABLE>

<TABLE> <S> <C>


<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND
<SERIES>
   <NUMBER> 022
   <NAME> LORD ABBETT RESEARCH FUND - GROWTH OPPORTUNITIES - CLASS B

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       49,576,746
<INVESTMENTS-AT-VALUE>                      60,392,191
<RECEIVABLES>                                2,465,187
<ASSETS-OTHER>                                 339,504
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              63,196,882
<PAYABLE-FOR-SECURITIES>                     3,475,656
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       73,738
<TOTAL-LIABILITIES>                          3,549,394
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    47,264,858
<SHARES-COMMON-STOCK>                          583,406
<SHARES-COMMON-PRIOR>                           18,195
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      1,549,900
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    10,815,445
<NET-ASSETS>                                10,954,442
<DIVIDEND-INCOME>                               54,435
<INTEREST-INCOME>                               63,717
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 101,105
<NET-INVESTMENT-INCOME>                         17,047
<REALIZED-GAINS-CURRENT>                     1,508,482
<APPREC-INCREASE-CURRENT>                   10,365,297
<NET-CHANGE-FROM-OPS>                       11,890,826
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        583,643
<NUMBER-OF-SHARES-REDEEMED>                   (18,432)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      54,924,378
<ACCUMULATED-NII-PRIOR>                            237
<ACCUMULATED-GAINS-PRIOR>                       41,418
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                159,531
<AVERAGE-NET-ASSETS>                         2,380,930
<PER-SHARE-NAV-BEGIN>                            12.57
<PER-SHARE-NII>                                 (0.06)
<PER-SHARE-GAIN-APPREC>                           6.27
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              18.78
<EXPENSE-RATIO>                                   1.07


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND
<SERIES>
   <NUMBER> 023
   <NAME> LORD ABBETT RESEARCH FUND - GROWTH OPPORTUNITIES - CLASS C

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       49,576,746
<INVESTMENTS-AT-VALUE>                      60,392,191
<RECEIVABLES>                                2,465,187
<ASSETS-OTHER>                                 339,504
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              63,196,882
<PAYABLE-FOR-SECURITIES>                     3,475,656
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       73,738
<TOTAL-LIABILITIES>                          3,549,394
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    47,264,858
<SHARES-COMMON-STOCK>                          449,715
<SHARES-COMMON-PRIOR>                           24,003
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      1,549,900
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    10,815,445
<NET-ASSETS>                                 8,437,661
<DIVIDEND-INCOME>                               54,435
<INTEREST-INCOME>                               63,717
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 101,105
<NET-INVESTMENT-INCOME>                         17,047
<REALIZED-GAINS-CURRENT>                     1,508,482
<APPREC-INCREASE-CURRENT>                   10,365,297
<NET-CHANGE-FROM-OPS>                       11,890,826
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        450,156
<NUMBER-OF-SHARES-REDEEMED>                   (24,444)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      54,924,378
<ACCUMULATED-NII-PRIOR>                            237
<ACCUMULATED-GAINS-PRIOR>                       41,418
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                159,531
<AVERAGE-NET-ASSETS>                         1,864,744
<PER-SHARE-NAV-BEGIN>                            12.59
<PER-SHARE-NII>                                 (0.06)
<PER-SHARE-GAIN-APPREC>                           6.23
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              18.76
<EXPENSE-RATIO>                                   1.07


</TABLE>

<TABLE> <S> <C>


<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND
<SERIES>
   <NUMBER> 024
   <NAME> LORD ABBETT RESEARCH FUND - GROWTH OPPORTUNITIES - CLASS Y

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                       49,576,746
<INVESTMENTS-AT-VALUE>                      60,392,191
<RECEIVABLES>                                2,465,187
<ASSETS-OTHER>                                 339,504
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                              63,196,882
<PAYABLE-FOR-SECURITIES>                     3,475,656
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       73,738
<TOTAL-LIABILITIES>                          3,549,394
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    47,264,858
<SHARES-COMMON-STOCK>                              157
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      1,549,900
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    10,815,445
<NET-ASSETS>                                     2,973
<DIVIDEND-INCOME>                               54,435
<INTEREST-INCOME>                               63,717
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 101,105
<NET-INVESTMENT-INCOME>                         17,047
<REALIZED-GAINS-CURRENT>                     1,508,482
<APPREC-INCREASE-CURRENT>                   10,365,297
<NET-CHANGE-FROM-OPS>                       11,890,826
<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>                      54,924,378
<ACCUMULATED-NII-PRIOR>                            237
<ACCUMULATED-GAINS-PRIOR>                       41,418
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                0
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                159,531
<AVERAGE-NET-ASSETS>                             1,652
<PER-SHARE-NAV-BEGIN>                            12.76
<PER-SHARE-NII>                                   0.09
<PER-SHARE-GAIN-APPREC>                           6.09
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              18.94
<EXPENSE-RATIO>                                   0.06


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
<SERIES>
   <NUMBER> 031
   <NAME> LORD ABBETT RESEARCH FUND - SMALL CAP VALUE SERIES - CLASS A

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
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<INVESTMENTS-AT-VALUE>                     460,716,650
<RECEIVABLES>                                3,574,397
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<DIVIDEND-INCOME>                            2,896,740
<INTEREST-INCOME>                              435,962
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               8,530,576
<NET-INVESTMENT-INCOME>                    (5,197,874)
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<NET-CHANGE-FROM-OPS>                       31,131,139
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<NUMBER-OF-SHARES-REDEEMED>                (6,476,363)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                    (54,829,835)
<ACCUMULATED-NII-PRIOR>                        (1,774)
<ACCUMULATED-GAINS-PRIOR>                 (30,380,175)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        3,562,324
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              8,577,378
<AVERAGE-NET-ASSETS>                       204,794,759
<PER-SHARE-NAV-BEGIN>                            14.36
<PER-SHARE-NII>                                 (0.12)
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<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              15.63
<EXPENSE-RATIO>                                   1.52


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
<SERIES>
   <NUMBER> 032
   <NAME> LORD ABBETT RESEARCH FUND - SMALL CAP VALUE SERIES - CLASS B

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
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<INVESTMENTS-AT-VALUE>                     460,716,650
<RECEIVABLES>                                3,574,397
<ASSETS-OTHER>                                       0
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<PAYABLE-FOR-SECURITIES>                     1,862,485
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<DISTRIBUTIONS-OF-INCOME>                            0
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<NUMBER-OF-SHARES-SOLD>                        828,910
<NUMBER-OF-SHARES-REDEEMED>                (4,647,173)
<SHARES-REINVESTED>                                  0
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<ACCUMULATED-GAINS-PRIOR>                 (30,380,175)
<OVERDISTRIB-NII-PRIOR>                              0
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<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              8,577,378
<AVERAGE-NET-ASSETS>                       173,043,758
<PER-SHARE-NAV-BEGIN>                            14.20
<PER-SHARE-NII>                                 (0.22)
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<EXPENSE-RATIO>                                   2.19


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
<SERIES>
   <NUMBER> 033
   <NAME> LORD ABBETT RESEARCH FUND - SMALL CAP VALUE SERIES - CLASS C

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      450,465,450
<INVESTMENTS-AT-VALUE>                     460,716,650
<RECEIVABLES>                                3,574,397
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             464,291,047
<PAYABLE-FOR-SECURITIES>                     1,862,485
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,879,523
<TOTAL-LIABILITIES>                          3,742,009
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   489,311,325
<SHARES-COMMON-STOCK>                        2,993,150
<SHARES-COMMON-PRIOR>                        4,430,191
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         (1,774)
<ACCUMULATED-NET-GAINS>                   (39,011,713)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    10,251,200
<NET-ASSETS>                                45,928,947
<DIVIDEND-INCOME>                            2,896,740
<INTEREST-INCOME>                              435,962
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               8,530,576
<NET-INVESTMENT-INCOME>                    (5,197,874)
<REALIZED-GAINS-CURRENT>                   (8,631,538)
<APPREC-INCREASE-CURRENT>                   44,960,551
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<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
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<NUMBER-OF-SHARES-SOLD>                        507,260
<NUMBER-OF-SHARES-REDEEMED>                (1,944,301)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                    (54,829,835)
<ACCUMULATED-NII-PRIOR>                        (1,774)
<ACCUMULATED-GAINS-PRIOR>                 (30,380,175)
<OVERDISTRIB-NII-PRIOR>                              0
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<GROSS-ADVISORY-FEES>                        3,562,324
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              8,577,378
<AVERAGE-NET-ASSETS>                        52,752,426
<PER-SHARE-NAV-BEGIN>                            14.20
<PER-SHARE-NII>                                 (0.22)
<PER-SHARE-GAIN-APPREC>                           1.36
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<PER-SHARE-NAV-END>                              15.34
<EXPENSE-RATIO>                                   2.19


</TABLE>

<TABLE> <S> <C>


<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
<SERIES>
   <NUMBER> 034
   <NAME> LORD ABBETT RESEARCH FUND -SMALL CAP VALUE SERIES- CLASS P

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<PERIOD-START>                             JUN-23-1999
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      450,465,450
<INVESTMENTS-AT-VALUE>                     460,716,650
<RECEIVABLES>                                3,574,397
<ASSETS-OTHER>                                       0
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<PAYABLE-FOR-SECURITIES>                     1,862,485
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,879,523
<TOTAL-LIABILITIES>                          3,742,009
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   489,311,325
<SHARES-COMMON-STOCK>                               69
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         (1,774)
<ACCUMULATED-NET-GAINS>                   (39,011,713)
<OVERDISTRIBUTION-GAINS>                             0
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<NET-ASSETS>                                     1,085
<DIVIDEND-INCOME>                            2,896,740
<INTEREST-INCOME>                              435,962
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               8,530,576
<NET-INVESTMENT-INCOME>                    (5,197,874)
<REALIZED-GAINS-CURRENT>                   (8,631,538)
<APPREC-INCREASE-CURRENT>                   44,960,551
<NET-CHANGE-FROM-OPS>                       31,131,139
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                             69
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                    (54,829,835)
<ACCUMULATED-NII-PRIOR>                        (1,774)
<ACCUMULATED-GAINS-PRIOR>                 (30,380,175)
<OVERDISTRIB-NII-PRIOR>                              0
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<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              8,577,378
<AVERAGE-NET-ASSETS>                               974
<PER-SHARE-NAV-BEGIN>                            16.41
<PER-SHARE-NII>                                 (0.06)
<PER-SHARE-GAIN-APPREC>                         (0.72)
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<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              15.63
<EXPENSE-RATIO>                                   0.72


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000887194
<NAME> LORD ABBETT RESEARCH FUND, INC.
<SERIES>
   <NUMBER> 035
   <NAME> LORD ABBETT RESEARCH FUND - SMALL CAP VALUE SERIES - CLASS Y

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1999
<PERIOD-END>                               NOV-30-1999
<INVESTMENTS-AT-COST>                      450,465,450
<INVESTMENTS-AT-VALUE>                     460,716,650
<RECEIVABLES>                                3,574,397
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                             464,291,047
<PAYABLE-FOR-SECURITIES>                     1,862,485
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    1,879,523
<TOTAL-LIABILITIES>                          3,742,009
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                   489,311,325
<SHARES-COMMON-STOCK>                        3,158,188
<SHARES-COMMON-PRIOR>                        2,478,036
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         (1,774)
<ACCUMULATED-NET-GAINS>                   (39,011,713)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                    10,251,200
<NET-ASSETS>                                49,607,957
<DIVIDEND-INCOME>                            2,896,740
<INTEREST-INCOME>                              435,962
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               8,530,576
<NET-INVESTMENT-INCOME>                    (5,197,874)
<REALIZED-GAINS-CURRENT>                   (8,631,538)
<APPREC-INCREASE-CURRENT>                   44,960,551
<NET-CHANGE-FROM-OPS>                       31,131,139
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        686,634
<NUMBER-OF-SHARES-REDEEMED>                    (6,482)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                    (54,829,835)
<ACCUMULATED-NII-PRIOR>                        (1,774)
<ACCUMULATED-GAINS-PRIOR>                 (30,380,175)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                        3,562,324
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              8,577,378
<AVERAGE-NET-ASSETS>                        44,486,212
<PER-SHARE-NAV-BEGIN>                            14.40
<PER-SHARE-NII>                                 (0.07)
<PER-SHARE-GAIN-APPREC>                           1.38
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              15.71
<EXPENSE-RATIO>                                   1.19


</TABLE>


INDEPENDENT AUDITORS' REPORT

To the Directors of Lord Abbett Research Fund, Inc.:

In planning and performing our audit of the financial  statements of Lord Abbett
Research  Fund,  Inc. (the  "Company")  (including  Growth  Opportunities  Fund,
Large-Cap  Series and Small-Cap  Value  Series) for the year ended  November 30,
1999 (on which we have issued our report dated January 28, 2000),  we considered
its internal control,  including control activities for safeguarding securities,
in order to determine our auditing  procedures for the purpose of expressing our
opinion on the financial  statements and to comply with the requirements of Form
N-SAR, and not to provide assurance on the Company's internal control.

The management of the Company is responsible  for  establishing  and maintaining
internal control. In fulfilling this responsibility,  estimates and judgments by
management  are  required to assess the expected  benefits and related  costs of
controls.  Generally,  controls  that are  relevant  to an audit  pertain to the
entity's objective of preparing financial  statements for external purposes that
are  fairly   presented  in  conformity  with  generally   accepted   accounting
principles.   Those  controls   include  the   safeguarding  of  assets  against
unauthorized acquisition, use, or disposition.

Because of inherent  limitations in any internal  control,  misstatements due to
error  or  fraud  may  occur  and  not be  detected.  Also,  projections  of any
evaluation  of internal  control to future  periods are subject to the risk that
the internal control may become  inadequate  because of changes in conditions or
that the degree of compliance with policies or procedures may deteriorate.

Our  consideration  of the  Company's  internal  control  would not  necessarily
disclose all matters in internal control that might be material weaknesses under
standards established by the American Institute of Certified Public Accountants.
A material  weakness is a condition  in which the design or  operation of one or
more of the internal  control  components  does not reduce to a  relatively  low
level the risk  that  misstatements,  error or fraud in  amounts  that  would be
material in relation to the financial statements being audited may occur and not
be  detected  within a timely  period  by  employees  in the  normal  course  of
performing their assigned functions.  However, we noted no matters involving the
Company's   internal   control  and  its  operation,   including   controls  for
safeguarding  securities,  that we consider to be material weaknesses as defined
above as of November 30, 1999.

This report is intended solely for the  information  and use of management,  the
Board of Directors of Lord Abbett  Research  Fund,  Inc., and the Securities and
Exchange  Commission  and is not intended to be and should not be used by anyone
other than these specified parties.


DELOITTE & TOUCHE LLP
New York, New York
January 28, 2000



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