| Measure Description | Source of measure | Bayley, N. (2006). Bayley scales of infant and toddler development. Pearson. |
| Mode of administration | Direct assessment
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| Age range for use | 1-42 mos
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| Domains Assessed | Adaptive 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 | |
| Burden | Training needed to administer | High 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 complete | 30-90 minutes, depending on age of child |
| # of items | Varies based on age and individual child |
| Cost | Yes |
| Adaptation for AIAN use | Adapted | No |
| Developer allows adaptation? | No |
| Used with AIAN populations? | Yes |
| Psychometrics | Norm-referenced | Yes |
| AIAN: Cronbach's alpha range | None provided yet |
| AIAN: Evidence of validity | None provided yet |
| Other populations: Cronbach's alpha range | Split-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 validity | Confirmatory 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). |
| Source | Developer | Pearson Assessments
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| Link | https://www.pearsonclinical.com/childhood/products/100000123/bayley-scales-of-infant-and-toddler-development-third-edition-bayley-iii.html#tab-scoring |
| Summary | Comments about sensitivity to change | A 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 remarks | Specific subtests can be administered - e.g. cognitive, language, etc. - to suit the needs of the project/assessment
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