A factor analysis of the Law School Admission Test (LSAT) battery was undertaken to gain a better understanding of the specific abilities which contribute to performance on the tests. To determine whether greater amounts of testing time should be allocated to groups of items defined by the factor analysis, a validity study was conducted. Existing section of the LSAT, the morning test, were shown to correspond closely to the factors. Variance in the afternoon tests was adequately explained by LSAT factors. It was shown that the length of the test battery could be reduced to a half day of testing time without impairing predictive validity. (Author/BW)