The Ritvo Autism Asperger's Diagnostic Scale Revised (RAADS–R) is a newly developed self-report diagnostic questionnaire. The RAADS is a self-administered scale assisting clinicians in diagnosing adults with Autism and Asperger's Disorder. It contains 80 questions which screen for autism and Asperger's disorder in adults. The RAADS–R has four question domains: Social, Language, Circumscribed Interests and Sensory Motor. The RAADS–R is intended to be administered by clinicians in conjunction with a clinical interview. It takes about 45 minutes to complete. Scoring is simple and a multi center international study recently completed demonstrates it to be highly sensitive and specific. Caution should be used in administering the RAADS–R to younger people 18-21 or anyone who is denying their symptoms. Since this is a self- report, the person being evaluated must want to participate and be aware that they are having issues or differences. Additionally, this questionnaire is only suitable to use with individuals who can read, write and understand the questions. Both the RAADS and RAADS–R were developed by Drs. Riva Ariella and Edward Ritvo and Max Ritvo. The first study was published in the Journal of Autism and Developmental Disorders (see PDF links). A follow up paper was published in Comprehensive Psychiatry (see PDF link). The international multi-center study was accepted for publication by JADD (see PDF link). An online ahead of print version is now available at SpringerLink.com. The RAADS–R is intended to be used as an adjunct diagnostic tool for adults.