Page "Intelligence quotient" Paragraph 11
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David Wechsler produced the first version of his test in 1939.
It gradually became more popular and overtook the Binet in the 1960s.
It has been revised several times, as is common for IQ tests, to incorporate new research.
One explanation is that psychologists and educators wanted more information than the single score from the Binet.
Wechsler's 10 + subtests provided this.
Another is Binet focused on verbal abilities, while the Wechsler also included nonverbal abilities.
The Binet has also been revised several times and is now similar to the Wechsler in several aspects, but the Wechsler continues to be the most popular test in the United States.
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