The traditional predictors of success in law school are undergraduate GPA and LSAT scores. First year average is the criterion most frequently used. In this study of predictive validity, LSAT scores and GPA were used to predict first, second, and third year averages for Black, Chicano and White students at 3 ABA approved law schools. For all students it was found that the LSAT was a better predictor of first year average than UGPA but that its predictive value decreased at a greater rate than that of UGPA over the three years of law school. While minority performance was over-predicted in each year of law school, the degree of over-prediction was less for second and third year averages than for first year averages. All students showed a tendency to achieve higher grades in each subsequent year, but this tendency was more marked for minority students than for White students.