This document discusses theories of school violence. It will use the ethological theory to explain human aggressive behavior as innate reactions developed through evolution related to survival instincts like territory and hierarchy. The theory suggests humans have evolved past genetic triggers for aggression. A second theory discussed is the personality theory, which says violent behavior stems from traits such as lack of self-control, impulsivity, or cognitive deficits making it hard to empathize with victims. The document will use these theories to understand types of violence occurring in schools, consequences of violence, and current prevention efforts.