This set of materials on the Skillstreaming methodology for training adolescents in social skills, especially students who are chronically aggressive, includes a book which explains the entire program, a student manual, a collection of program forms, and a box of skill cards for use with students. Chapter 1 of the book examines the nature and impact of aggressive students and explains the goal of Skillstreaming as the explicit teaching of alternative prosocial behaviors. Chapter 2 reviews the program's history and development. Chapter 3 focuses on program implementation factors and chapter 4 details procedures for conducting a Skillstreaming group. A transcript of a group session illustrating these procedures constitutes chapter 5. Chapter 6 presents 50 skills with their component behavioral steps. Chapter 7 addresses skill sequences and consequences. Chapter 8 considers issues of trainee motivation and resistance, while chapter 9 discusses ways to enhance generalization of skill performance. Chapter 10 looks at safety in the school setting. The final chapter considers future directions and opportunities. Appendices include a bibliography, checklists, grouping guides, and materials for other instructional levels. The student manual, collection of forms, and 400 skill cards (eight cards for each skill to use with eight students) are designed to facilitate implementation of the Skillstreaming methodology. (Contains approximately 130 references.) (DB)