This chapter discusses suicidal & assaultive behaviours. The section on the suicidal patient reviews epidemiology, identification of the potentially suicidal patient, assessing suicidal risk with an outline of population & individual risk factors, initiating appropriate treatment, & treatment principles. The section on violent patients discusses mental disorders with associated violent behavior, recognizable patterns of violence, evaluating threats of violence, management of the acutely violent patient, & ongoing care. (12 refs.)