THE RELIABILITY OF BAYLEY'S REVISED SCALE OF MENTAL AND MOTOR DEVELOPMENT DURING THE FIRST YEAR OF LIFE

Abstract

A tester-observer and test-retest reliability study of Bayley's Revised Scales of Mental and Motor Development with eight months old infants yielded the following results: (1) Mental Scale items with high tester-observer and high test-retest reliabilities deal with object-oriented behavior; (2) Mental Scale items with low test-retest reliabilities require social interaction; (3) Motor Scale items with high tester-observer and high test-retest reliabilities deal with independent control of head, trunk, and extremities; (4) Motor Scale items with low test-retest reliability require assistance by an adult. The implications of the findings for early diagnosis of neural malfunctioning are discussed.

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