Over two decades, diverse actors have been fashioning a collective response to the disproportionate impact of modern war on women. Motivating factors have included an emerging recognition of the need for human security and growing awareness that military force is insufficient. Where women are concerned, the WPS agenda has become a key mechanism in the pursuit of inclusive policies. For example, survivors of 1990s genocide have campaigned for UN action to ensure women’s full participation in security decisions by employing the principles of WPS in their advocacy. Moreover, the experiences of women in conflict, coupled with their exclusion from formal processes, have inspired a groundswell of political activism among women. This chapter examines the key milestones and motivators of this movement. In doing so, it demonstrates that as international policymakers engaged, a broader range of champions accelerated the movement. We suggest that despite challenges, the political movement associated with WPS has facilitated the creation of tools, including national action plans and UN Security Council Resolution 1325, that acknowledge the positive contributions of women’s meaningful inclusion.