An analysis of scatter among the Tests of Cognitive Ability for the Woodcock-Johnson Psycho-Educational Battery was conducted on the performance of subjects in grades 1 through 12 from the standardization sample. Large mean high subtest-low subtest differences were noted for each grade level and compared to WISC-R scaled score ranges. Frequency distributions for high-low differences are presented as well as the mean differences between all pair-wise combinations for the 12 subtests. The practice of examining scatter on the Tests of Cognitive Ability, and especially efforts to identify specific “types” of learning disabled students using this test, are discouraged.
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