Data from the National Science Foundation Fellowship applicant records and the NRC Office of Scientific Personnel Doctorate Records File were utilized to evaluate the potential of GRE Aptitude and Advanced Tests as predictors of whether or not the candidate attained the doctorate within a period of from seven to ten years. In addition, the study sought to determine whether there were particular subgroup within each field as described by variables such as age, "quality" of the institution or graduate department, for which the GRE have varying degrees of predictive accuracy. Sample sizes ranging from 643 to 779 were obtained for three fields, mathematics, chemistry, and psychology, and divided into two samples so that cross-validation could be performed. Results indicate that mathematics and chemistry had higher levels of predictability than psychology. In all three fields, the GRE Advanced Tests were the best predictors. Age was a better predictor for math than for psychology or chemistry. (DJ)