Home > Encyclopedia of Psychology > Bayley Scales of Infant Development

A comprehensive developmental test for infants and toddlers from two to 30 months of age.

The Bayley Scales of Infant Development measure mental and physical, as well as emotional and social, development. The test, which takes approximately 45 minutes, is administered individually by having the child respond to a series of stimuli. The Mental Scales, which measure intellectual development, assess functions such as memory, learning, problem-solving ability, and verbal communication skills. The Motor Scales evaluate the child's ability to sit and stand, perform other activities requiring coordination of the large muscles (gross motor skills), and perform more delicate manipulations...