For the two children studied and in the situations observed and recorded, important conditions for the emergence of language in the ontogeny of communication appear to be: (1) interaction with caretaking adults, (2) shared focal attention, and (3) specificity of reference. (Author)

Reports on an experiment describing the lexical development of a hearing child with a deaf mother and hearing father. Data confirm previous findings that (1) sign emerges before spoken word, (2) acquisition stages are similar in ASL and spoken English, and (3) the child initially develops one lexical system. (Author/AM)