The research summaries in this monograph provide a discussion of play in young children as well as examinations of differences, values, and interventions associated with children's play. Following an introduction to the topic, four articles examine differences in children's play: two articles focus on sex stereotyping in preschoolers' child-selected play activities, and two discuss sociodramatic play among, respectively, Mexican-American and Black 3- and 4-year-olds. Concerning values, three articles examine the relationships between cognitive levels of play and child-selected play activities, play level and language use, and group play and verbal intelligence test performance by preschool- or kindergarten-age children. With regard to intervention, the final article discusses the effects of modeling on the sociodramatic play of kindergarten and first-grade children enrolled in a Title I elementary school. Several of the studies evolve from the work of Smilansky (1968): two utilize this researcher's identification of four levels of play, while three examine aspects of her concept of sociodramatic play. Each summary reports purpose, procedure, findings, and conclusions. (RH)