The Autism Observation Scale for Infants (AOSI; Bryson et al., 2008) is a semi-structured observational measuredesigned to identify early behavioural markers of ASD (e.g., atypicalities in social communication, engagement, affect sharing, attention, and behavioural regulation) in infants and toddlers aged 6 to 18 months.
Administration takes 15-20 minutes. Each behaviour 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 information on the AOSI, please see the following publications: