Two tests of intellectual ability were compared in terms of quantitative measures and professional utility in the context of 41 students who were referred for psychoeducational investigation of their learning. Full-scale, Composite, and Factor scores from The Stanford Binet Intelligence Scales — Fifth Edition (SB5) and the Das Naglieri Cognitive Assessment System (CAS) were compared and individual profiles were examined. The SB5 is the latest version of a traditional test referenced to the Cattell-Horn-Carroll factor model of intelligence, while the CAS was developed from an information processing theory of intelligence. Full-scale measures of intellectual ability were found to differ significantly, with the SB5 approximately 8 points higher than the CAS. Analysis of the profiles assisted in understanding specific learning abilities and guided interventions. The implications of this for the relative utility of the two instruments, their interchangeablity, the meaningful interpretation of results, and their complementary contribution to practice are discussed.

The Bayley Scales of Infant Development, Third Edition (Bayley-III) and Stanford-Binet Intelligence Scale, Fifth Edition (SB5) were administered in a sample of 26 typically developing children (12 males and 14 females) aged 24–42 months. Children completed the assessments in two separate sessions, counterbalanced for order of administration. Scores on the two instruments were not significantly related, with the exception of the SB5 Knowledge score, which was moderately correlated with the Language score on the Bayley-III (r = .41, p = .04). Despite no other significant correlations, for 22 of the 26 children, scores were very consistent across the two instruments. Implications for test selection are discussed.

This study compared two popular measures of cognitive ability for preschool children. The Wechsler Preschool and Primary Scale of Intelligence — Third Edition (WPPSI-III) and the Stanford-Binet Intelligence Scale — Fifth Edition (SB5) were administered in a counterbalanced order to 36 typically developing 4-year-old children. There were significant correlations among all WPPSI-III and SB5 composite scores but a number of children had notable differences between their scores on the two measures. Children tended to prefer the SB5 over the WPPSI-III. The implications for practitioners who assess preschool-aged children are discussed.