1. Developmental Tests Bayley Scales of Infant and Toddler Development,
third edition
(Bayley-III)

2. Bayley Scales Nancy Bayley – Institute of Child Welfare – Berkeley CA
Original test 1969
Revised 2005

3. Characteristics of test
1- 42 months
Flexible administration format
50 to 90 minutes
Theoretically eclectic
English only

4. Uses of Bayley-III Identify developmentally delayed children
Chart progress on intervention program
Teach parents about development
Research tool

5. Major goals of revision
Meet IDEA 2004 cirteria
Update normative data
Extend age range
Improve content coverage
Update stimulus materials
Improve psychometric quality
Improve clinical utility of scales
Preserve basic qualities of scale

6. Scales
Cognitive
Language
Motor
Social-Emotional*
Adaptive Behavior*

7. Cognitive scale (Cog) Infant: interest, attention/habituation, play
Toddler: exploration (toys, situations), problem solving, puzzle completion
Preschool: pretend play, building blocks, color matching, counting, more complex puzzles

8. Language scale (Lang) Receptive Communication (RC):
Infant: recognize sounds, objects, people
Toddler: identify pictures and objects, follow directions, play peek-a-boo, wave bye-bye
Preschool: follow more complex directions, identify action pictures, understand basic grammar

9. Language scale (Lang) Expressive Communication (EC)
Infant: non-verbal expressions
Toddler: use words to identify pictures, answer questions
Preschool: more complex stimuli than toddler

10. Motor Scale (Mot) Fine Motor (FM)
Infant: following with eyes, hand to mouth, reaching or grasping
Toddler: stacking blocks, drawing simple shapes, place coins in slots
Preschool: draw more complex shapes, build simple structures, use scissors

11. Motor Scale Gross Motor (GM)
Infant: head control, rolling, sitting, crawling
Toddler: crawling, stepping, support own weight, stand without assistance
Preschool: climb stairs, run, maintain balance, kick a ball

12. Social-Emotional (SE)
Caregivers give feedback
Infant: interest, getting attention, calming, responsiveness
Toddler: means/ends behavior, imitation play, imagination, word use
Preschool: interactions with peers/adults, describe feelings, use emotions

13. Adaptive Behavior Communication Functional Pre-Academics
Self-Direction
Leisure
Social
Community use
Home living
Health and Safety
Self-Care
motor

14. Video of Bayley assessment
video link