Gilliam Autism Rating Scale - Third Edition (GARS-3)

Purpose: Identifies individuals with autism and estimates the severity.

Age: 3–22 years

Time: 5–10 minutes

The Gilliam Autism Rating Scale–Third Edition (GARS-3), based on DSM-5 Definition of Autism Spectrum Disorder, assists teachers, parents, and clinicians in identifying autism in individuals and estimating its severity.

Items on the GARS-3 are based on the 2013 diagnostic criteria for autism spectrum disorder (ASD) adopted by the APA and published in the Diagnostic and Statistical Manual of Mental Disorders–Fifth Edition (DSM-5).

The instrument consists of 56 clearly stated items describing the characteristic behaviours of persons with autism. The items are grouped into six subscales:

1. Restrictive/Repetitive Behaviors
2. Social Interaction
3. Social Communication
4. Emotional Responses
5. Cognitive Style
6. Maladaptive Speech

Key Features

• Forty-four new items were added to the GARS-3
• Yields standard scores, percentile ranks, severity level, and probability of Autism
• All six subscales have been empirically determined to be valid and sensitive for identification of children with ASD
• An interpretation guide in the Examiner’s Manual allows the examiner an easy and efficient method for assessing the probability of autism spectrum disorder and the severity of the disorder
• A diagnostic validation form is included for insuring that test results meet DSM-5 criteria for autism spectrum disorder

Now available! Online Scoring, Administration, and Report System

Access to the GARS-3 Online Administration, Scoring, and Report System is now included with the purchase of each GARS-3 Complete Kit and with the purchase of every replacement pack of Summary/Response Forms. 

This administration, scoring, and report system was designed as a quick, efficient tool for:

• Completing ratings online;
• Entering test session data;
• Converting subscale item scores or total raw scores into scaled scores and percentile ranks;
• Generating Autism Index scores and percentile ranks;
• Obtaining a score summary and narrative report;
• Saving or printing examinee responses;
• Generating treatment goals and objectives based on the item performance of the student.

Your activation code required to access the online system is printed on the Forms. Information on how to set up your new account is found in the Manual. Each test user requires an account - an organisation can set up a single account and add examiners/administrators as required.

Activation URL.