Construct Validity of the Kaufman Brief Intelligence Test, Wechsler Intelligence Scale for Children-Third Edition, and Adjustment Scales for Children and Adolescents

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Abstract
The present study reports data supporting the construct validity of the Kaufman Brief Intelligence Test (K-BIT; Kaufman & Kaufman, 1990), the Wechsler Intelligence Scale for Children-Third Edition (WISC-III; Wechsler, 1991), and the Adjustment Scales for Children and Adolescents (ASCA; McDermott, Marston, & Stott, 1993) through convergent and discriminant comparisons in a sample of 207 students receiving special education evaluations. Results were as hypothesized, with high and statistically significant correlations between the K-BIT and WISCIII, supporting convergent validity. Moderate and statistically significant correlations were obtained between the two intelligence measures (K-BIT and WISC-III) and measures of academic achievement (WIAT, WIAT-II, WJ-R ACH, or WJ-3 ACH) at levels typical of ability-achievement correlations. Correlations between the two intelligence measures (K-BIT and WISC-III) and the ASCA, a measure of child psychopathology, were low to near zero, supporting discriminant validity. Further discriminant evidence of construct validity was provided by the low to near zero correlations between the ASCA and the measures of academic achievement.