| International Journal | Spring 2012 | 275 | Elisabeth King is a postdoctoral research fellow at the Earth Institute and Centre for the Study of Development Strategies at Columbia University. Robert O. Matthews is professor emeritus in the department of political science at the University of Toronto. This issue of International Journal is rooted in a workshop they organized at the University of Toronto in October 2011 with their co-organizer and co-editor, Ian Spears. They would all like to gratefully recognize funding from the Munk School of Global Affairs and the department of political science, both at the University of Toronto, as well as the Centre for International and Defence Policy at Queen’s University. At these institutions, they extend special thanks to Steven Bernstein, David Cameron, and Kim Nossal, respectively; to the workshop participants included as authors in this special issue and to Alex Costy, Ernie Regehr, and Vijaya Sripati. They are likewise grateful for the contributions of all attendees and the special roles played by students Vanessa Abban, Katie Degendorfer, Alison Duffy, Stefanie Freel, Marion Laurence, and Naomi Williams. Taisier Ali, Cristina Badescu and James Milner offered helpful thoughts on this article. Thanks finally to Rima Berns-McGown, Joseph Jockel, and David Haglund at International Journal for their support and encouragement. This year, 2012, marks the 20th anniversary of Boutros Boutros-Ghali’s seminal “An agenda for peace.” Penned in response to a request by the United Nations security council to prepare and circulate an “analysis and recommendations on ways of strengthening and making more eficient within the framework and provisions of the Charter the capacity of the United Nations for preventive diplomacy, for peacemaking and for peacekeeping,” Elisabeth King & Robert O. Matthews A new agenda for peace 20 years later