Assessing the impact of men’s engagement to prevent gender-based violence, and recognising good practices as they are developed is integral to the future of work to address gender inequalities and the violence that flows from power imbalances between men and women. This research shares the strategies for change implemented by, and the quasi-experimental impact evaluations of, four different three-year long projects to engage men to prevent gender-based violence in Chile, Brazil, India and Rwanda.  The research population group included men and women from ages 14-64. Themes of masculinity, gender, violence against women and sexuality were central to the efforts. All countries held a common intervention approach which included educational workshops with men on gender equity, campaigns and training programmes with partner staff on evidence-based methodologies for the prevention of violence against women.

• In India, workshops were used to promote gender equality through the local leadership council, Panchayats. A decline in self-reported intimate-partner violence (IPV) and an increase in knowledge of laws around violence against women were recorded.
• In Brazil, awareness about violence against women was raised by engaging men in dialogue through sports. There was a significant decrease in the percentage of men who accepted IPV and self-reported increase in conversations about gender equality.
• In Chile, educational workshops were conducted for young men via the public health sector. Results showed a significant positive change in participants’ self-reported behaviour towards greater gender equity, including an increase in condom use. 
• In Rwanda, three coffee cooperatives conducted trainings to educate farmers on violence against women. There was a reported increase in the questioning of violence by men, more equitable division of labour as well as a decrease in the number of cases. Results in Rwanda are qualitative and not assessed against a control group.

The program activities show possibilities for future attitude and behaviour change inititiatives, and the four approaches share lessons in engaging and retaining large numbers of men (and women in some settings) in initiatives to address violence against women. Recommendations for future work include the need for more joint interventions promoting women’s empowerment together with engaging men, and rigorous assessment of the impact of programmes, accompanied by strong monitoring and evaluation systems.