As preschoolers develop the ability to carry out their ideas and play alone and with others, they are developing the foundation for social competence. This booklet and a companion videotape help teachers and parents recognize and support nine High/Scope key experiences in initiative and social relations: (1) making and expressing choices, plans, and decisions; (2) solving problems in play; (3) taking care of one's needs; (4) expressing feelings in words; (5) participating in group routines; (6) being sensitive to feelings, interests, and needs of others; (7) building relationships with children and adults; (8) creating and experiencing collaborative play; and (9) dealing with social conflict. The booklet discusses each key experience, delineates ways teachers and parents can support children in skill development, and includes a teacher strategy checklist. The 58-minute videotape highlights strategies to support children in developing initiative and social relations abilities. In the first part of the videotape, the narrator introduces each of the key experiences, illustrated with footage of children and teachers in a variety of High/Scope classrooms designed to help viewers identify key experiences and increase awareness of strategies, such as imitating children's actions, and encouraging children to reflect on what they are doing or develop their ideas further. The second part of the videotape shows four extended video scenes from High/Scope classrooms without narration as in-depth examples of how key experiences unfold in everyday play situations. Each scene shows adults responding to children as they initiate play ideas, encounter problems, and interact with peers. The accompanying viewer guide describes the videotape content, provides a checklist of teacher strategies, and lists additional resources. (KB)