At the time of its adoption in October 2000, United Nations Security Council resolution 1325 on Women, Peace and Security (WPS) was hailed as a turning point for women involved in conflicts, peacemaking, peacekeeping and post-conflict reconstruction. Resolution 1325 required all efforts aimed at resolving conflicts and building peace to be inclusive, gender-sensitive and transformative for women. In recent years, National Action Plans (NAPs) on WPS have become one of the most commonly used tools by states to channel, assess and monitor the implementation of resolution 1325 and other UN WPS resolutions. This book presents an edited version of the proceedings of the NATO Advanced Research Workshop (ARW) on 'National Action Plans on Women, Peace and Security', held in Dublin, Ireland, in May 2016. The workshop brought together representatives from various states, as well as academics, and members of civil society and international organizations, to discuss their experiences with NAPs and to critically reflect on the role of NAPs in supporting the implementation by states of the WPS framework. The aim of this book is to disseminate the key arguments, findings, and recommendations which emerged from the discussions held at the ARW. It includes a summary report which sets out key arguments and recommendations and offers a number of key papers from the ARW, with the intention of contributing to academic and policy debates concerning gender and armed conflict and, more particularly, the WPS framework.