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 article reviews recent research on phonological development and characteristics associated with different forms of delay. Language-delayed students are considered categorizable at 24 months as either "late talkers" with no major deviations from patterns of normal acquisition or disordered students whose developmental patterns are markedly…

In response to Larry Silver (EC 231 774) concerning whether attention deficit-hyperactivity disorder is a learning disability via a related disorder, this article proposes an interactional perspective that stresses the educational needs of the child within his/her total environmental context. It also summarizes the current empirical and clinical…

Arguments supporting the conceptual validity of learning disabilities are presented against the background of current definitional problems. The need to differentiate between classification and identification and the importance of a shared attribute definition are stressed. It is argued that a taxonomy of learning disabilities and related…

For successful classification of children with attention deficit-hyperactivity disorder, major issues include (1) the need for explicit studies of identification criteria; (2) the need for systematic sampling strategies; (3) development of hypothetical classifications; and (4) systematic assessment of reliability and validity of hypothetical…

This review of studies of early onset schizophrenia examines the nosological similarity between adult and early onset schizophrenia, differential diagnosis, treatment, and the extent to which children and adolescents diagnosed as having schizophrenia using adult criteria have the characteristic adult correlates. The paper discusses gender…

This article, which introduces six papers on the validity of distinguishing subgroups of children with language and learning disabilities based on discrepancies between academic attainment and intelligence test scores, comments on the papers' diversity in samples, measurement characteristics, and statistical approaches and outlines the studies'…

A review and analysis of relevant literature discusses the heterogeneity of social competence observed in learning disabled children. Sociometric group classification is judged to be a viable behavioral classification framework. Inconsistencies are noted in the way peer popularity, peer acceptance, and sociometric status are defined in the…

This review of the literature, litigation, and legislation summarizes special education classification patterns for children with disabilities in the rural Southeast. Focus is particularly on those socially constructed and culture bound disabilities (such as specific learning disabilities (SLD), educable mental retardation (EMR), and mild…

Presented in both French and English, the document contains extracts from a review of the literature on students with learning disabilities (LD) and on French speaking exceptional students' programs and needs. The review of LD includes sections on approaches to definition and classification, incidence, and definitional components (intelligence,…

This book examines critical issues in classification and definition of learning disabilities; the development of theory in learning disabilities; the development of cognitive, developmental, and educational models of learning disabilities; and social and public policy in learning disabilities. After an introductory chapter by G. Reid Lyon and…