Validity of a four-subtest short form (SF4) of the third edition of the Wechsler Intelligence Scale for Children (WISC-III) and the Kaufman Brief Intelligence Test (K-BIT) was evaluated in a sample of 42 young offenders 13 to 17 years of age. A test-retest methodology was used in a design that also yielded K-BIT reliability data for a subset of 24 participants. Results showed that SF4 outperformed the K-BIT on all validity indexes. Although stability coefficients for the K-BIT ranged from .79 to .92, concurrent validity for K-BIT scales with corresponding WISC-III summary IQs was low to modest. It was hypothesized that limited content overlap and the singular format of Matrices contribute to differences between K-BIT Matrices Standard Scores and WISC-III Performance IQs.
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