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History of Intelligence Testing (Page 5)
Two years after Binet's significant revision of his measurement of human intelligence, the Wechsler Bellevue Intelligence Scale (1939) revolutionized intellectual assessment. Essentially, Wechsler believed Binet's scale was an inappropriate measure of intelligence, particularly adult intelligence. His criticism focused on the following aspects of the 1937 scale: it offered only a single score, it did not take into account non-intellective factors, the scale items were selected for use with children so they lacked validity when applied to adults, the emphasis on speed tended to handicap older adults and other such factors. Two major scales comprised the Wechsler Bellevue Intelligence scale: the Point Scale and the Performance scale.
  
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