The theme for this final chapter is the control of aggression and violence in sport. It will take a critical look at how the law deals with violent acts in sport, and at the arguments and recommendations for ‘reducing the incidence of aggression and violence in the athletic domain’ contained in the International Society of Sport Psychology’s (ISSP) position stand. Following on from this critical review, measures are proposed for (a) reducing unsanctioned violent acts in sport, based on successful strategies implemented by the Australian Rugby League (ARL) and (b) dealing with soccer hooliganism and other types of sports riots. Finally, the usefulness of reversal theory in providing a new and integrated framework for understanding aggressive and violent behaviour in sport and the implications of this approach for research are discussed.