The Gilliam Autism Rating Scale-Third Edition (GARS-3) assists teachers, parents, and clinicians in identifying autism in individuals and estimating its severity. The GARS-3 yields standard scores, percentile ranks, severity level, and probability of Autism.
The instrument consists of 56 clearly stated items describing the characteristic behaviours of persons with autism, with items grouped into six subscales: Restrictive/Repetitive Behaviors, Social Interaction, Social Communication, Emotional Responses, Cognitive Style, and Maladaptive Speech.
Items on the GARS-3 (44 of which are new to the 3rd ed.) are based on the 2013 diagnostic criteria for Autism Spectrum Disorder adopted by the APA and published in the Diagnostic and Statistical Manual of Mental Disorders-Fifth Edition (DSM-5).
The GARS-3 Summary/Response Form provides the space to record the individual's demographic details, the rater responses, the raw scores, standard scores, percentile ranks and information related to the diagnosis of Autism Spectrum Disorder.