The Cognitive Abilities Scale—Second Edition Preschool Form

Abstract

Three studies examine the validity of the Preschool Form of the Cognitive Abilities Scale—Second Edition (CAS-2). Significant high concurrent criterion-related validity correlations, corrected for restricted range, are found between the CAS-2 and the Detroit Test of Learning Ability—Primary: Third Edition for 26 three-year-olds ( rc = .86) and the Bayley Scales of Infant Development—Second Edition for 20 two-year-olds ( rc = .63). Significant correlations also are evident for the CAS-2 and the Test of Early Language Development—Third Edition for 26 three-year-olds ( rc = .77) and the Adaptive Behavior Assessment System—Second Edition for 20 two-year-olds ( rc = .65). Predictive power is critical when making interpretations regarding future performance. A high, significant correlation ( r c = .72) is observed for the CAS-2 for 37 children at ages 2 and 3 and the Wechsler Intelligence Scale for Children—Third Edition administered 6 years later. Results expand validity evidence for the CAS-2, increasing confidence in interpretations regarding young children's performance.