This summary presents the evidence on the effectiveness of different types of response mechanisms for violence against women and girls in preventing the occurrence of violence. The interventions reviewed were all developed and deployed with a primary goal of strengthening the response of the police and criminal justice system, health system or social sector to violence against women and girls. This review has not assessed evidence on their effectiveness in achieving this primary goal; it has focused on assessing any evidence that they are able to achieve a secondary or parallel goal of prevention of violence against women and girls.