This book presents the work of leading authorities in the field to provide comprehensive, up-to-date reviews of existing research on ego identity, to furnish a series of manuals for use by researchers employing the ego identity interview, and to reflect on the history of identity research and provide an agenda for future investigations. Ego identity formation is examined from adolescence to adulthood including a study on gender diffences. This book is for researchers of ego identity and intimacy as well as for the clinical psychologist and the psychiatrist.