screening

While there is no one behavioral or communications test that can detect autism, several screening instruments have been developed that are now being used in diagnosing autism:

CARS rating system (Childhood Autism Rating Scale), developed by Eric Schopler in the early 1970s, is based on observed behavior. Using a 15-point scale, professionals evaluate a child's relationship to people, body use, and adaptation to change, listening response, and verbal communication.