A Response to Some Questions Raised About the Woodcock-Johnson I. the Mean Score Discrepancy Issue

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Abstract
Most research on the Woodcock-Johnson Psycho-Educational Battery has been concerned with mean score differences between the WISC-R Full Scale and the Woodcock-Johnson Broad Cognitive Ability cluster. The results from 21 studies were summarized presenting differences ranging from 0 to 12 points. The median difference observed in referral samples was four or five points. At least three factors may account for the differences—two types of data bias, and the higher correlation of the Woodcock-Johnson cognitive subtests with school achievement. Reasons for this higher correlation were explored. The critical question is: Which test provides the most valid and useful information for making psychoeducational decisions?