Using data from the Pathways in ASD Study, together with those from 5 sites in the US, a National Institutes of Health (NIH)-funded collaboration will produce and test a new measure of social communication skills in children with neurodevelopmental disorders. The new measure will be a computer-based parent report on child abilities, rather than impairments, in social communication. The families of children entering the McMaster Children's Hospital's Pediatric Autism Research Collaborative (PARC) will be invited to enter this study, too.