This document reports on three years of clinical research involving the development of effective clinical intervention procedures for children with slow language development. The assessment and treatment approaches discussed in the report are based upon the developmental model of grammar described in Developmental Sentence Analysis (DSA), a clinical procedure for evaluating the level of a child's grammatical development, from a tape-recorded sample of the child's spontaneous speech. The report contains an overview of project accomplishments; statistical information on DSA; material on interactive language development teaching and the use of this method with 25 clinical children; a group remediation program for children with atypical syntax, utilizing operant and programed procedures; and the dissemination of project information. Included are a list of references, 40 tables of findings, and six charts. (JM)