Bayley Scales of Infant and Toddler Development, Third Edition (Bayley-III)

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Children are assessed in the five key developmental domains of cognition, language, social-emotional, motor and adaptive behaviour.

Author(s): Nancy Bayley
Publication Year: 2005
Age Range: 1 month to 42 months
Administration: Individual – 30 minutes to 90 minutes (depending upon the age of child)
Bayley-III offers significant additions and improvements to the previous editions.

Key features:

Core battery of five scales: Three scales administered with child interaction; cognitive, motor, language. Two scales conducted with parent questionnaires; social-emotional, adaptive behaviour
Caregiver Report Form – a template for the examiner to provide scores, information on tests given, how child performed and recommendations
Behaviour Observation Inventory – separate scale for validating examiner and parent perceptions of the child’s responses
New norms based on 1,700 children stratified according age, based on the 2000 US Census
Ideal for team-testing or multi-disciplinary teams where a professional in each area may assess the child
Flexible – can administer one or more domain subtests individually
Rolling case for ease of travel


Dimensions 35 × 25 × 1 cm


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