Bayley Scales of Infant Development, 3rd Edition

Measure DescriptionSource of measure Bayley, N. (2006). Bayley scales of infant and toddler development. Pearson.
Mode of administration Direct assessment
Age range for use1-42 mos
Domains AssessedAdaptive behavior (communication, self-care, self-direction); cognitive development (visual preference, attention, memory, sensorimotor, exploration & manipulation, concept formation), language development (receptive & expressive), motor functioning (fine and gross), social-emotional development (communicating needs, self-regulation, using emotional signals)
Related Measures
BurdenTraining needed to administerHigh level of expertise: must have (a) doctorate degree in psychology, education, or similar field, as well as formal training in the process of assessment, (b) licensure or certification to practice in related field, or (c) certification by or active membership in a professional organization relevant to field
Minutes to complete30-90 minutes, depending on age of child
# of itemsVaries based on age and individual child
Adaptation for AIAN useAdaptedNo
Developer allows adaptation?No
Used with AIAN populations? Yes
AIAN: Cronbach's alpha rangeNone provided yet
AIAN: Evidence of validityNone provided yet
Other populations: Cronbach's alpha rangeSplit-half reliability of cognitive, language, and motor scales range from .91 to .93. Average reiability of subtests (e.g., fine motor) ranged from .86 to .91. Test-retest reliability ranged from .67 to .80 for age group 2-4 months, and from .83 to .94 for age group 33-42 months. Across all ages, the average stability over time was .80 or higher. For the social-emotional scales, internal consistency ranged from .76 to .94. For the adaptive behavior scales,internal consistency ranged from .79 to .98, and average interrater reliability ranged from .73 to .82 (Bayley, 2006).
Other populations: Evidence of validityConfirmatory factor analysis with full 1,700-child standardization sample supported a three factor model of cognitive, language, and motor scales. The Bayley shows convergent validity with the Weschler Preschool and Primary Scale of Intelligence-Third Edition, and Peabody Developmental Motor Skills-Second Edition, and the Vineland Adaptive Behavior Scale-Interview Edition (Bayley, 2006). Demonstrates concurrent validity with the Ages & Stages Questionnaire (Gollenberg, Lynch, Jackson, McGuinness, & Msall, 2009). In one study, there was a lack of concurrent validity between the Bayley and the Peabody Developmental Motor Scale II for children 12 months old; the authors caution against relying entirely on one score when determining needs for intervention (Connolly et al., 2006). See technical manual for more information on validity, standardization, and use with special groups (e.g., developmental disorders).
SourceDeveloperPearson Assessments
SummaryComments about sensitivity to changeA meta-analysis showed that, in randomized control trials, intervention groups show improvements in the Bayley, especially the mental development index (Vanderveen, Bassler, Robertson, & Kirpalani, 2009). Young children who are placed in foster care (vs. institutions) demonstrate improvements in Bayley scores (Nelson et al., 2007).
General remarksSpecific subtests can be administered - e.g. cognitive, language, etc. - to suit the needs of the project/assessment