Identfy the research method used?

Identfy the research method used by Lewis M. Terman study

Identfy the research method used?
(born 15 January 1877 in Johnson County, Indiana, died 21 December 1956 in Palo Alto, California) was a U.S psychologist, noted as a pioneer in cognitive psychology in the early 20th century at Stanford University. He is best known as the inventor of the Stanford-Binet IQ test. He was a prominent eugenicist and was a member of the Human Betterment Foundation.


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