Rates of verbalizing by three children exhibiting moderate to severe language delays (delays of six months to two years) were increased through the systematic use of mands for verbalization, models for verbalization, and contingent positive consequences following utterances. Daily samples of each child's speech were collected during free play…

Directed both to parents and to professionals, the manual explains factors involved in normal and abnormal language development. Language disorders are discussed, and methods and sources of help are described. (JD)