The rater should be someone who knows the individual well and has had sus-tained contact with him or her for at least 2 weeks. The examiner is responsible for selecting the most appropriate person to complete the rating. It can be completed by parents and professionals in a variety of settings, including the home and school. The GARS-2 is a measure that has potential to link assessment to intervention. However, few existing instruments incorporate this much-needed feature. Moreover, clinicians benefit from using tools that pro-vide an obvious and explicit link to intervention. There is a need for easy-to-use instruments that pos-sess good psychometric properties. General Description Administration Screens and diagnostic instruments for autism spectrum disorders are increasingly required by professionals in various fields to enable timely and appropriate interventions (National Resource Council, 2001). Furthermore, it is intended to facilitate data-driven approaches to assessment and intervention by incorporating a resource that links instructional objectives to assessment findings. The GARS-2 was designed to be a supplementary tool for the diagnosis of autism, and it is intended to be used with a variety of diagnostic tools and relevant information in comprehensive assessment protocols for autism. It is a norm-referenced instrument that reflects the conceptualizations of autism per the Diagnostic and Statistical Manual of Mental Disorders (fourth edition, text revision American Psychiatric Association, 2000) and the Autism Society of America (1994). It was designed to help differentiate those with autism from those with severe behavioral disorders as well as from those who are typically developing. The Gilliam Autism Rating Scale–Second Edition (GARS-2) is a screening tool for autism spectrum disorders for individuals between the ages of 3 and 22.
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