The goal of this paper is to examine the psychometric properties of a live-coded behavioral measure of joint attention, the "Attention-Following and Initiating Joint Attention Protocol" (JA Protocol), in order to assist researchers and clinicians in identifying when this measure may meet their joint attention assessment needs. Data from…

The reliability of a new scale to assess Autistic Disorder, Pervasive Developmental Disorder, Not Otherwise Specified (PDD-NOS), and Asperger's Disorder in children was examined. Parents or other caregivers rated symptoms of 207 children between 2 and 16 years of age. The scale, which had 40 items in the final version, correlated highly with…

This paper reviews 20 studies that investigated the internal or external validity of various subtypes of autistic spectrum disorders. At least three groups could be distinguished from autism on clinical grounds: an Asperger syndrome subtype, and two atypical subtypes characterized by either low intelligence quotient or high intelligence quotient.…

This paper reviews whether Rett syndrome is a subtype of pervasive developmental disorders (PDD). The paper analyzes internal and external diagnostic validity and discusses whether Rett syndrome is a neurological disorder or a mental disorder. The paper concludes that data support the idea of classifying Rett syndrome as a subtype of PDD.…

This review evaluates research on the treatment of challenging behavior in school settings for students with autism spectrum disorders (ASD). Electronic database searches were carried out to identify studies published between 1995 and 2005. Twenty-six studies were identified. A variety of procedures were implemented in these studies to decrease…

This study assessed the criterion-related validity of the PDD Behavior Inventory, a rating scale to evaluate the adaptive and maladaptive behaviors of children with pervasive developmental disorders. Good correlations with five other scales confirmed the scale's validity and suggest its value in assessing treatment-related changes in maladaptive…

This essay notes the complexities inherent in classifying pervasive developmental disorders (PDD), especially when a single classification scheme is to be used for clinical, research, and administrative purposes. The paper considers principles of classification, symptomatology, the neuropsychiatric interface, the value of a multiaxial approach,…

Forty parents of children with autism or pervasive developmental disorder completed the Wing Subgroups Questionnaire, developed for subclassifying children into one of L. Wing's three hypothesized subgroups. Results indicated that the questionnaire has adequate external criterion-referenced validity, with similar subgroup ratings made by…

This study, involving 24 children or adolescents with pervasive developmental disorders, assessed 3 autism scales: Autism Behavior Checklist, Real Life Rating Scale, and Childhood Autism Rating Scale. The study analyzed interrater reliability, correlations between pairs of the three scales, diagnostic classification cutoff scores, and…