Purpose: To propose that the diagnostic category of "expressive language disorder" as distinct from a disorder of both expressive and receptive language might not be accurate. Method: Evidence that casts doubt on a pure form of this disorder is reviewed from several sources, including the literature on genetic findings, theories of language…

Data are presented to support the reliability, validity, and utility of a procedure to assess the severity of a phonological disorder. The severity metric, the percentage of consonants correct (PCC), is readily derived from a continuous speech sample. PCC values index four levels of severity of involvement: mild, mild-moderate, moderate-severe,…

A diagnostic classification system for phonological disorders is presented which is oriented to the goals of explanation, prediction, and management. Data supporting the validity and utility of the system are also provided, based on a retrospective classification of 43 children with delayed speech. (Author/SEW)

Developmental language disorders in preschool children are described. Levels of linguistic functioning are defined, and clinical language disorders are presented. Implications for the school psychologist are discussed, with an emphasis on assessment of verbal and non-verbal functions. (SLD)