Project TALENT is a large-scale, long-range longitudinal study of a representative sample of students assessed with a comprehensive set of psychological, educational, and personal measures. In 1960, students in grades 9 through 12 were given a battery of tests and inventories. One-year, five-year, eleven-year, and twenty-year follow-ups of the same students by questionnaires constitute the longitudinal aspects of the study. The Data Bank Handbook is intended to assist researchers in deciding whether Project TALENT data are suitable for their studies and in formulating their final study plans. Information on the following is provided: (1) Project TALENT--measures used, sample, follow-up procedures, differential weighting of cases, sample sizes, special data files (Knox County saturation sample, 15-year-old sample, 4 percent sample, 1963 retest); and (2) Project TALENT Data Bank--types of services provided (printouts, work tapes, test use, contract research), follow-back studies, utilizing the data bank, cost and time estimates, analysis programs, hypothetical examples. Appendices provide the 1960 student data, school questionnaires, follow-ups, and information about Project TALENT Data Bank projects. (KM)