This is a retrospective study of the incidence and severity of patient inflicted injuries upon nursing staff in a 160 bed psychiatric hospital over a period of two years. The investigation explored possible relationships between the basic educational preparation of the injured staff members, the severity of their injuries, and whether they used the behavior management techniques learned in the Mandt System classes. (The Mandt System has been used at Alaska Psychiatric Institute since 1979 to train nursing staff in how to safely deal with assaultive people.)