This unique volume provides an overview of the most recent clinical work and research on gender identity disorder and psychosexual problems in children and adolescents. The extant literature is integrated with findings from the authors' own clinical research which incorporates the largest sample of children with gender identity disorder ever studied. Reflecting the authors' years of expertise in assessing and treating this population, this detailed work includes information on the disorder's core phenomenology, epidemiology, diagnosis and assessment, associated psychopathology, treatment, and long?term follow?up. Special attention is paid to the most recent research on the etiology of gender identity disorder and allied psychosexual phenomena, including transvestic fetishism, and the development of sexual orientation. Detailed clinical case material is included throughout.