Featuring focused material and contemporary research, _Adolescent Development: Ages Nine to Nineteen_ introduces readers to issues that affect the daily lives of tweens and teens. The anthology focuses on three key constructs that require special attention for youths in this age group: the physical, the psychological, and the social. The collection begins with a unit that familiarizes students with foundational theories of adolescent development. Unit II contains readings related to cognition, including brain development and trauma-informed treatment for adolescents. In Unit III, students read about physical development, wellness, and nutrition. Unit IV focuses on aspects of social-emotional development, including social achievement goals and gender as a development issue. Unit V highlights risk factors and delinquency with readings that address abuse across the life course, youth gang involvement, and cyberbullying. The final unit examines the American family, the process of coming of age, and obstacles of emerging adulthood. The second edition includes more firsthand accounts of youth trauma and fresh readings on gender development. New articles on developmental theories, school-based strategies to facilitate post-traumatic growth among urban families, and abuse across the life course are included. _Adolescent Development_ is an ideal resource for courses in pre-adolescent and adolescent human development, as well as courses in psychology, social work, behavioral sciences, and sociology.