Concurrent validity of the WISC-III and WISC-IV was conducted using a sample of 35 students classified as educable mentally disabled. Full Scale IQ scores of previously administered WISC-III correlated .91 with WISC-IV Full Scale IQ scores when adjusted for restricted range. Of the previous eligibility decisions, 80% were confirmed by the WISC-IV scores. Implications of the findings and suggestions for research are discussed.
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