Embedded Files
Bayley, N. (2005). Bayley Scales of Intant and Toddler Development-Third Edition. San Antonio, TX: Harcourt Assessment.
Kit includes: a manual (technical and administrative), a stimulus book, 25 record forms, and a manipulative set.
The Bayley-III is a norm-referenced test used to identify suspected developmental delays in young children between the ages of 1 and 42 months.
The test was normed to 1,700 children (aged 16 days to 43 months and 15 days) divided into 17 age groups each containing 100 participants.
The Bayley-III assesses children's abilities in 5 developmental areas
Cognitive (play skills, information processing, counting + number skills)
Language (receptive and expressive language)
Motor (fine and gross motor skills)
Social-emotional (emotional and social functioning as well as sensory processing)
Adaptive behavior (practical skills children need to function independently and meet environmental demands appropriate for their age)
How is the Bayley conducted:
Time to administer:
30-70 minutes to administer (depending on the age of the child)
Scales administered by clinician:
3 scales:
the Cognitive Scale
The Language Scale
The Motor Scale
(all through observation and direct interaction with the child)
Scales completed by parent/caregiver:
2 scales:
The Social-Emotional Scale
Adaptive Behavior Scale from the Social-Emotional and Adaptive Behavior Questionnaire
Strengths & Weaknesses:
A Strength:
Materials used in this test can be easily found in stores by parents. Caregivers could use these materials as examples of activities that could be used to further aid in their children’s development at home.
A Weakness:
The manual for the test does not explain how to differentiate between typically developing children and those who have delayed/disordered development in the normative sample, thus lacking a reference standard.
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