Eighty 4-to 6-year-old children expected to be highly intelligent were administered the WPPSI and the WPPSI-R in counterbalanced order. Overall, findings from this study of high-IQ preschoolers replicated results from the WPPSI-R standardization sample in terms of correlations between the two measures, factor structure, and score differences. WPPSI-R Full Scale, Performance, and Verbal IQs were 6.0, 9.2, and 3.5 points lower, respectively, than their WPPSI counterparts. The most notable finding of the study was a higher rate of significant Verbal > Performance discrepancies on the WPPSI-R than on the WPPSI, with discrepancies of 15 points or more on the WPPSI-R found in 26% of the sample.
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