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The Gilliam Asperger's Disorder Scale (GADS) is a tool for assisting the medical diagnosis of Asperger syndrome. More specifically, it is a rating scale for behaviour, which can be used by either individuals or professionals, and is commonly used by school psychologists.[1][2][3][4]

It comprises 32 diagnostic characteristics, divided into four sub-scales. The four sub-scales are Social Interaction, Restricted Patterns of Behaviour, Cognitive Patterns, and Pragmatic Skills. An optional additional sub-scale of eight items, Early Development, can also be included.[1]

The rating scores on each of the sub-scales are combined by simple summation to form an overall score, the Asperger's Disorder Quotient.[1]

Administering the test takes 10 minutes.[3] The scale is available in forms for teachers as well as parents, and like the Gilliam Autism Rating Scale it is comparatively less complicated to administer and score than other tests such as the Autism Diagnostic Observation Schedule or the Autism Diagnostic Interview — Revised (although both of these more complex tests are increasingly used in research).[4]


  1. ^ a b c Aradhamna A. Sood and Donald P. Oswald (2005). "Diagnostic Instruments". in Sandra B. Sexson and Douglas O. Lee. child and adolescent psychiatry. Blackwell Publishing. pp. 1672. ISBN 1405117680.  
  2. ^ James T. Webb, Edward R. Amend, and Nadia Webb (2005). Misdiagnosis and Dual Diagnoses of Gifted Children and Adults. Great Potential Press, Inc.. pp. 246. ISBN 0910707677.  
  3. ^ a b Frank C. Verhulst and Jan van der Ende (2006). Assessment Scales in Child and Adolescent Psychiatry. CRC Press. pp. 214. ISBN 1841845345.  
  4. ^ a b Linda Wilmshurst (2008). Abnormal Child Psychology. CRC Press. pp. 563. ISBN 0415953634.  

Further reading

  • James E Gilliam (2001). Gilliam Asperger's Disorder Scale: Examiner's Manual. Pro-Ed.  
  • Wilmshurst, Linda (2008) Abnormal Child Psychology: A Developmental Perspective. NY: Routledge.


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