The first Wechsler test published was the Wechsler Bellevue Scale in 1939 . The Wechsler IQ tests for children and for adults are the most frequently used individual IQ tests in the English-speaking world and in their translated versions are perhaps the most widely used IQ tests worldwide.
2.
David Wechsler, developer of the Wechsler Bellevue Scale of 1939 ( which was later developed into the Wechsler Adult Intelligence Scale ) popularized the use of " deviation IQs " as standard scores of IQ tests rather than the " quotient IQs " ( " mental age " divided by " chronological age " ) then used for the Stanford Binet test.
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These criticisms of the 1937 Binet test helped produce the Wechsler-Bellevue scale, released in 1939 . While this scale has been revised ( resulting in the present day WAIS-IV ), many of the original concepts Wechsler argued for, have become standards in psychological testing, including the point-scale concept and the performance-scale concept.
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