Interpersonal violence, acknowledged as a worldwide public health problem, may take several forms and occurs across a range of settings. There are several theories based on personal interactions within a given situation which highlight the importance of context. In addition, this form of violence is associated with, although not fully explained by, factors such as the effects of alcohol, mental disorder, and heightened emotion. It is evident that there is much to be gained, in both human and financial terms, from a reduction in levels of interpersonal violence. The next chapter considers the ways in which such reductions may be achieved and their likely costs and benefits.