violence is an extreme form of antisocial and delinquent behavior, often occurs as part of a general
involvement in antisocial behavior, and is infrequently studied apart from other types of antisocial
behavior, we also considered studies related to serious antisocial behavior and delinquency. We
acknowledge that not all antisocial and delinquent behavior, such as use of drugs or burglary, is
violent or aggressive, but such behaviors typically are highly correlated with violence and
aggression. Also, we confined our focus to violence that is not self-inflicted (e.g., suicide) or carried
out as a societally sanctioned behavior (e.g., police and military actions). These forms of violence
may be undesirable, but they are of a different nature with regard to impact, causes, outcomes, and
need for intervention than the behaviors we examined.