Autism Observation Scale for Infants (AOSI)

The Autism Observation Scale for Infants (AOSI; Bryson et al., 2008) is a semi-structured observational measure designed to identify early behavioral markers of ASD (e.g., atypicalities in social communication, engagement, affect sharing, attention, and behavioral regulation) in infants and toddlers aged 6 to 18 months. Administration takes 15-20 minutes. Each behavior is rated on a scale from 0 to 2 or 3, where 0 implies typical function, and higher values indicate increasing atypicality. The AOSI has excellent inter-rater reliability (0.93 for total score at 12 months) and fair-to-good test-retest reliability (assessed twice, two weeks apart) at 12 months (0.61 for total score; Bryson et al., 2008).  The AOSI is available in English and French.

Training opportunities are available in person or virtually.
For more information, contact asdab@ualberta.ca

For more inforamtion about the measure in research, please see the following publications:

Zwaigenbaum, L., et al. (2021). Assessment of autism symptoms from 6 to 18 months of age using the Autism Observation Scale for Infants in a prospective high-risk cohort. Child Development, 92(3), 1187-1198. https://doi.org/10.1111/cdev.13485

Zwaigenbaum, L., et al. (2021). Symptom trajectories in the first 18 months and autism risk in a prospective high-risk cohort. Journal of Child Psychology and Psychiatry, 61(12), 1435-1443. https://doi.org/10.1111/jcpp.13417