Children in regular Grades 4 and 5 were given the WISC and WISC-R, in counterbalanced order, along with the Wide Range Achievement Test. Correlations were computed among all major subscales. WISC IQ averaged five points higher than WISC-R. The two scales intercorrelated (.61 to .85) at significant levels. WISC and WISC-R correlations with the Wide Range Achievement Test were similar, with WRAT correlation slightly larger with the WISC than WISC-R.
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