Thirty eight studies which employed Graduate Record Examinations (GRE) scores in predicting success in graduate study are reviewed. The report is presented in four sections--summary of findings by major field of study (23 different major fields); 21 studies employing varied criteria of success; 13 studies employing grade-point average as the criterion; and predicting graduate school success of foreign students (2 studies). While cautioning the reader about the dangers of drawing conclusions from these studies, the authors nonetheless make four broad generalizations: (1) students with higher test scores perform at a higher level in graduate school than those with lower scores; (2) the verbal ability score is most highly related to performance in subjects of a descriptive nature, for example the humanities, while the quantitative ability score is usually more predictive in the physical sciences; (3) advanced test scores in the appropriate subject were useful predictors and improved the correlation when used along with the aptitude test scores; and (4) best prediction was obtained when undergraduate grades and test scores were used in combination. (Author/ROF)