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Seeks relationship between size of head to intelligence, doesn't find one.
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Alfred Binet & Thodore Simon compose the first intelligence test (30 questions)
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Refine the test and creates sub-tests for ages 3-13, increases the size of the sample (from 50 to 300) & define the concept of 'mental age' alongside a method of calculating a score on the test.
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Continues to refine the test and adds more sub-tests to match adults
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Lewis M. Terman adopts and adapts Alfred Binet's test and creats the first version of the Stanford-Binet Intelligence Scale
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Opposes the notion of singular General intelligence (G) and suggests to focus on Specific intelligence (S), he suggests 7 basic "Primary Mental Abilities".
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Taking in mind the criticism about Stanford-Binet's intelligence test, David Wechsler creates the Wechsler-Bellevue Intelligence Scale
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Following WAIS Wechsler creates WISC - Wechsler Intelligence Scale for Children
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Based on the Wechsler-Bellevue, David Wechsler creates the WAIS - Wechsler Adult Intelligence Scale
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Following WAIS & WISC, Wechsler creates WPPSI - Wechsler Preschool & Primary Scale of Intelligence
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(1967/1988), like Thurstone, Guilford opposes the notion of singular General intelligence (G). Guilford's Structure of Intellect theory suggests 180 intellectual abilities/factors based on 3 dimentions: Operation (6), Content (5) & Product (6).
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1971/1979 Cattell exapnds Spearman's view of General Intelligence (G) & hypothesized about 2 discrete factors - fluid and crystallized intelligence.
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David Wechsler revises the WISC and creates it's next edition - WISC-R
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David Wechsler revises the WAIS and creates it's next edition - WAIS-R
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