Abstract
This paper views specific language disorders as a heterogeneous group of language-impaired children consisting of distinct subtypes, each potentially accounted for by differing causal factors. Identifying causal factors for subgroups of children with specific language impairment is important (a) to extend our discipline beyond the descriptive stage of science, (b) to address questions motivating referrals from parents and professionals, (c) to plan intervention programs, and to prevent specific language disorders.