The Encyclopedia of Adolescence breaks new ground as an important central resource for the study of adolescence. Comprehensive in breath and textbook in depth, the Encyclopedia of Adolescence - with entries presented in easy-to-access A to Z format - serves as a reference repository of knowledge in the field as well as a frequently updated conduit of new knowledge long before such information trickles down from research to standard textbooks. By making full use of Springer's print and online flexibility, the Encyclopedia is at the forefront of efforts to advance the field by pushing and creating new boundaries and areas of study that further our understanding of adolescents and their place in society. Substantively, the Encyclopedia draws from four major areas of research relating to adolescence. The first broad area includes research relating to "Self, Identity and Development in Adolescence". This area covers research relating to identity, from early adolescence through emerging adulthood; basic aspects of development (e.g., biological, cognitive, social); and foundational developmental theories. In addition, this area focuses on various types of identity: gender, sexual, civic, moral, political, racial, spiritual, religious, and so forth. The second broad area centers on "Adolescents' Social and Personal Relationships". This area of research examines the nature and influence of a variety of important relationships, including family, peer, friends, sexual and romantic as well as significant nonparental adults. The third area examines "Adolescents in Social Institutions". This area of research centers on the influence and nature of important institutions that serve as the socializing contexts for adolescents. These major institutions include schools, religious groups, justice systems, medical fields, cultural contexts, media, legal systems, economic structures, and youth organizations. "Adolescent Mental Health" constitutes the last major area of research. This broad area of research focuses on the wide variety of human thoughts, actions, and behaviors relating to mental health, from psychopathology to thriving. Major topic examples include deviance, violence, crime, pathology (DSM), normalcy, risk, victimization, disabilities, flow, and positive youth development.