Selected studies that examine social interaction variables which affect the language young children use in social play are reviewed. Interaction variables discussed in major sections of the paper are (1) the nature of social play; (2) egocentrism and its impact on verbal communication; (3) language as a functional behavior; (4) adaptation of language to environmental demands; and (5) social play training for language production. Findings discussed are summarized at the end of each section. Studies selected for review are taken as representative of contemporary research and not as inclusive. It is concluded that the language of social play is a rich, viable and rapidly expanding area for investigation. The theoretical notion of linking social, language, and play behaviors through their common intersect -- imaging --will result, it is believed, in an increasing amount of research knowledge regarding children's social play and related factors affecting the quality and quantity of communicative interaction in children's environments. (Author/RH)