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The Bayley Scales are carefully constructed norm-referenced measures for assessing the development of infants and toddlers, ages 1 month to 3 years 6 months. Originally developed by Dr. Nancy Bayley and published in 1969, the Second Edition of the Bayley Scales (BSID-II) was published in 1993, and a third edition (Bayley-III) was released in 2006. The description that follows focuses on the Bayley-III, developed by the staff of the Psychological Corporation with advice from a panel of outside experts, consultants, and reviewers. The administration manual states that Bayley-III “maintains the original nature and purpose of the Bayley Scales as envisioned by its author, Nancy Bayley” (Bayley, 2006a, p.1). Keywords: infant development; developmental assessment; cognitive assessment; motor assessment; language assessment; social-emotional assessment; adaptive behavior assessment |
