The new global Women, Peace, and Security (WPS) Index introduced in this report bridges insights from gender and development indices with those from peace and security indices. The index incorporates three basic dimensions of well- being—inclusion (economic, social, political); justice (formal laws and informal discrimination); and security (at the family, community, and societal levels)—and captures and quantifies them through 11 indicators. It ranks 153 countries—covering more than 98 percent of the world's population—along these three dimensions in a way that focuses attention on key achievements and major shortcomings. It reflects a shared vision that countries are more peaceful and prosperous when women are accorded full and equal rights and opportunity. A primary goal of the index is to accelerate progress on both the international Women, Peace and Security agenda and the Sustainable Development Goals, bringing partners together around an agenda for women's inclusion, justice, and security. It offers opportunities for stakeholders to review and discuss challenges and to identify opportunities for trans- formative change. It highlights key priorities, points toward a roadmap of needed reforms, and can inform more effective partnerships and collaboration.