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This study investigated whether the K‐ABC measures the same constructs as the WISC‐R and the Stanford‐Binet. Forty‐one second‐, third‐, and fourth‐grade children from a private midwestern school were divided randomly into groups, which were administered the above three tests in counterbalanced order. Standard scores were computed for the K‐ABC Simultaneous and Sequential Scales, Mental Processing Composite, and Achievement Scale. From the WISC‐R, Full Scale IQs and Verbal Comprehension, Perceptual Organization, and Freedom from Distractibility factor scores were computed for each child; from the Binet, factors above were computed from groupings that would be comparable to the three K‐ABC orders. Results of this study appear to support the viability of the K‐ABC as an assessment instrument that measures the properties of mental functioning that can explain the variance of test performance and that are similar to those measured by the WISC‐R and Stanford‐Binet.