This paper reviewed the psychometric properties of the DSM-III-R (Diagnostic and Statistical Manual III, Revised) criteria for autism. Results indicated that the criteria had, on average, very good sensitivity but much lower specificity. It is concluded that the DSM-III-R criteria act more like screening criteria than diagnostic criteria.…

The Autism Behavior Checklist was evaluated with 94 autistic and 63 nonautistic subjects. Although the two groups differed significantly in ratings of pathology both false positive and false negative diagnostic classifications occurred. The test appears to have merit as a screening instrument but should not be used alone to establish a diagnosis…

This case study of a toddler with autism whose parents had videotaped her development from birth showed that the child's behavior and development were essentially normal for the first year but that she then became withdrawn in only a few months. It is suggested that early communicative screening tests might have identified the child's earliest…