SMPY is the longest-running longitudinal study of gifted children in the United States. Subjects are identified by high scores on the
SAT Reasoning Test, which they take at or before the age of 13 years. Eligibility is contingent on scoring at least 700 out of a possible 800 standard score points on the test (with prorated eligibility for higher scores up to age 13 years and 10 months). Participation in SMPY is voluntary for students who attain eligible scores. After the first year, Stanley decided to include students with exceptional scores in either the mathematics or verbal test sections, for inclusion in what is called the
Study of Exceptional Talent, the name SMPY was retained for the follow-up surveys. Follow-up surveys were sent to study participants after five, ten, twenty, and thirty-five years. Benbow and Lubinski and their colleagues used the data to explore individual differences among intellectually able individuals. The study population is divided into several subgroups. ==Findings==