This revision improves an instrument already viewed as the gold standard for the observational assessment of autism spectrum disorders (ASDs). With updated protocols, revised algorithms, a new Comparison Score, and a new Toddler Module, the ADOS-2 provides a highly accurate picture of current symptoms unaffected by language. The ADOS-2 can be used to evaluate almost anyone suspected of having ASD—from 1-year-olds who do not consistently use phrase speech to adults who are verbally fluent.

Like its predecessor, the ADOS-2 is a semi-structured, standardized assessment of communication, social interaction, play, and restricted and repetitive behaviors. By observing and coding these behaviors, clinicians can obtain information that informs diagnosis, intervention, treatment planning, and educational placement. (author abstract)