Scores on the Wechsler Adult Intelligence Scale-Revised (WAIS–R) and Wechsler Intelligence Scale for Children-Third Edition (WISC–III) were compared for 46 youth in the overlapping 16-yr.-age range Students were administered the tests in a counterbalanced order with an average retest interval of 40 days. Self-reported grade average was also obtained from students. Criteria for parallel tests (equal means, equal variances, equal covariances) were applied in the analyses. WAIS–R and WISC–III summary IQs were parallel, but corresponding subtest scores as a group were not parallel.
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