This is a review of the recent literature on student characteristics and their predictive potential for academic achievement. Results are not optimistic, often contradictory, and on the whole account for little variance beyond that accounted for by tests of intellectual ability. Researchers often use different performance criteria and so results are not comparable. However, there has been much complex, diverse, and unique work done on personality and motivational factors but no clear trends have emerged. Other factors investigated have been home and class background, study habits, previous withdrawal, and expectations. The review concludes by demonstrating the usefulness of the cluster analysis approach which indicates groups of students with similar patterns of characteristic criteria.