A review of studies comparing the WISC–III to other measures of intelligence and achievement indicates the revision is continuing to meet the standards established by its predecessor, the WISC–R. Correlations are substantial, both for measures of ability and achievement; however, compared to the WISC–R, the WISC–III Full Scale IQ tends to be about six points lower, probably reflecting the “Flynn effect” (1984). As a consequence, eligibility for programs in special education may be negatively affected.
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