One of a series of papers which focus on 10- to 15-year-old adolescents, this publication describes these young people as they work through developmental tasks in environments (families, communities, peer groups, and schools) that are part of their daily lives. This description is used as a basis to accomplish the following: (1) a further definition of the classic issues of adolescent development; (2) a brief and selective summary of what is and what is not known about development during adolescence; and (3) a placing of the issues of attachment, autonomy, intimacy, sexuality, achievement, and identity in a framework that helps to made sense of adolescence. These issues are defined, clarified, and discussed in relation to the primary changes (biological, reasoning, and social definition) that occur during adolescence. In addition, an annotated bibliography containing 40 references to papers of related interest is included. (Author/SS)