The innumerable questionnaires and inventories, seldom fully sufficient for diagnosis, include the Autism Behavior Checklist (ABC), the Childhood Autism Rating Scale (CARS), the popular Checklist for Autism in Toddlers (CHAT), the seven-hour-long Diagnostic Interview for Social and Communication Disorders (DISCO), the Autism Diagnostic Interview–Revised (ADI-R), and the highly regarded Autism Diagnostic Observation Scale–Generic (ADOS-G). It’s hard to find a consistent instrument that applies to both people who speak and those who are nonverbal.
