This article explores the available research literature on language development and language interventions among deaf and hard of hearing (d/hh) children. This literature is divided into two broad categories: Research on natural languages (specifically American Sign Language and spoken English) and research on communication systems (specifically…

During an eight-month treatment regimen utilizing simultaneous sign/speech input, all of the words of a young girl with Down's Syndrome were recorded. Analyses revealed that most of the words she initially signed were later spontaneously spoken and that most of her signed productions evolved into spontaneous spoken productions. (Author/JDD)

Disfluencies in the verbal and signed language of a 10-year-old moderately mentally retarded boy were analyzed. Discussion addresses implications for the accurate characterization of stuttering in manual communication and appropriate approaches to management in such cases. (DB)