The Wechsler Adult Intelligence Scale (WAIS) and the Wechsler Intelligence Scale for Children (WISC) were administered to one hundred and twenty 16-year-old students in counterbalanced order. About half of the 5s were of average intelligence (IQ = 80-119), one-fourth less than average (IQ below 80), and one-fourth above average (IQ above 120). Analyses of variance indicated significance for order of administration and intelligence level. Higher scores were produced by the WAIS in the less-than-average group, and by the WISC in the other groups. Intertest differences may be masked when groups of varying intelligence levels are combined in a reliability sample.This study was prompted by the repeated observations of special education teachers that the Wechsler Adult Intelligence Scale (WAIS) seemed to produce exaggerated estimates of intellectual potential. These same teachers did not report any comparable exaggerations from predictions made from the Wechsler Intelligence Scale for Children (WISC). A literature review revealed only three references dealing with the relationship between the WAIS and the WISC. Green (1965) administered the WISC to SO pupils just under age 16. Four months later, after his Ss reached the age of 16, the WAIS was administered. The principal finding reported was that the WAIS tended to produce scores that were 2-4 points higher than the WISC on the Verbal, Performance, and Full Scale IQs. The mean differences between the Performance and the Full Scale IQ of these two instruments proved to be significant. Correlations between the similar IQ scores varied from .86 to .92, and were all highly significant.Webb (1963) reported testing Negro educable retardates, with approximately two years intervening between test administrations, and found that the WAIS produced uniformly

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