Recent research has shown that a significant proportion of North American children are sexually, physically, or psychologically abused each year, and that the number of reports of adult rape, spousal abuse, and physical assault by strangers continues to grow. Beyond the epidemiology of societal violence per se is its impact on the mental health of those who live in our culture. Scientists and clinicians are beginning to trace the genesis of a number of psychological symptoms and disorders to childhood or adult traumatic events, many of which involve interpersonal violence. As a result, a new specialty of mental health practitioners has evolved, one specifically concerned with the assessment and treatment of psychological trauma. At the same time, however, the typical front-line clinician is bound to encounter children and adults who have been victimized and who present complex post-traumatic sequelae. It is for both the trauma specialist and the general clinician that this sourcebook was developed. Although the subject matter is disturbing, growing assessment and treatment technology give us new hope for treating victims of violence. This is the 64th issue of the quarterly journal New Directions for Mental Health Services.