The Bayley Scales of Infant and Toddler Development-Third Edition (Bayley-III; Bayley, 2005) may be used to identify developmental delays, chart a child's progress, and teach parents about the child's development. The test is designed to be used with children ages 1 to 42 months. It consists of five scales: Cognitive, Language (Receptive and Expressive), Motor (Fine and Gross), Social-Emotional, and Adaptive Behavior (Conceptual, Social, and Practical). It also includes a test observations measure to aid in intervention planning. This addition includes growth scores, index scores (standard scores), subtest scaled scores, and percentiles. The Adaptive Behavior scale of the Bayley-III was adapted from the Parent/Primary Caregiver form of the Adaptive Behavior Assessment System-Second Edition (ABAS-II; Harrison & Oakland, 2003).

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