This study elaborates the critique of five of the most important theorists addressing adolescent identity: Erik Erickson, Peter Blos, Lawrence Kohlberg, Jane Loevinger and Robert Kegan. The implications of each approach are discussed in both natural and clinical settings, with special emphasis given to new developments in the field including up-to-date coverage of key concepts, research and criticism stemming from each of the theoretical models. With its blend of theoretical insight and practical advice this work should appeal to psychologists, educators, youth workers, health professionals, parents and anyone attempting to understand and respond to the developing adolescent identity.