Designed for communication aides working under the direction of speech pathologists in Head Start and preschool centers in public schools, the handbook provides information on normal child development as well as speech, hearing, and language problems. Reviewed in the section on normal development are speech, phonemic, receptive language, expressive language, social, and motor development. Administrative procedures involving the paraprofessionals are explained to include screening, scheduling, and recording pupil performance. A final section examines the application of behavioral principles. Among seven appendixes are lists of bilingual testing materials and articulation tests. (CL)