On April 28, 2004, the United Nations Security Council, acting under Chapter VII of the UN Charter, unanimously passed UNSC 1540. The resolution "decided that all States shall refrain from providing any form of support to non-state actors" attempting to obtain or use weapons of mass destruction, "adopt and enforce appropriate effective laws" to that effect, and "take and enforce effective measures to "prevent the proliferation of" WMD. To carry out its part of this mandate, the UNSC established and renewed a Committee, which has mainly and usefully assisted States in adopting "appropriate effective laws." This study, in collaboration with Committee members, has focused on implementation mechanisms and indicators of performance in border and exports controls, securing materiel and facilities, and adapting controls to State needs. We conclude that the most meaningful measures of implementation need to be more broadly adopted and that the 1540 Committee needs a more extensive staff in order to extend its role to disseminate States' experience with those measures. We also conclude that mechanisms need to be developed to facilitate information sharing between the Committee and the private sector.

Michael May is a professor emeritus (research) in the Stanford University School of Engineering and a senior fellow with the Freeman Spogli Institute for International Studies at Stanford University. He is the former co-director of Stanford University's Center for International Security and Cooperation, having served seven years in that capacity through January 2000. May is a director emeritus of the Lawrence Livermore National Laboratory, where he worked from 1952 to 1988, with some brief periods away from the Laboratory. While there, he held a variety of research and development positions, serving as director of the Laboratory from 1965 to 1971. May was a technical adviser to the Threshold Test Ban Treaty negotiating team; a member of the U.S. delegation to the Strategic Arms Limitation Talks; and at various times has been a member of the Defense Science Board, the General Advisory Committee to the AEC, the Secretary of Energy Advisory Board, the RAND Corporation Board of Trustees, and the Committee on International Security and Arms Control of the National Academy of Sciences. He is a member of the Council on Foreign Relations and the Pacific Council on International Policy, and a Fellow of the American Physical Society and the American Association for the Advancement of Science. May received the Distinguished Public Service and Distinguished Civilian Service Medals from the Department of Defense, and the Ernest Orlando Lawrence Award from the Atomic Energy Commission, as well as other awards. His current research interests are in the area of nuclear and terrorism, energy, security and environment, and the relation of nuclear weapons and foreign policy.

Chaim Braun is a vice president of Altos Management Partners, Inc., and a CISAC science fellow and affiliate. He is a member of the Near-Term Deployment and the Economic Cross-Cut Working Groups of the Department of Energy (DOE) Generation IV Roadmap study. He conducted several nuclear economics-related studies for the DOE Nuclear Energy Office, the Energy Information Administration, the Electric Power Research Institute, the Nuclear Energy Institute, Non-Proliferation Trust International, and others. Braun has worked as a member of Bechtel Power Corporation's Nuclear Management Group, and led studies on power plant performance and economics used to support maintenance services. Braun has worked on a study of safeguarding the Agreed Framework in North Korea, he was the co-leader of a NATO Study of Terrorist Threats to Nuclear Power Plants, led CISAC's Summer Study on Terrorist Threats to Research Reactors, and most recently co-authored an article with CISAC Co-Director Chris Chyba on nuclear proliferation rings. His research project this year is entitled "The Energy Security Initiative and a Nuclear Fuel Cycle Center: Two Enhancement Options for the Current Non-Proliferation Regime."

Allen Weiner is an associate professor of law (teaching) at the Stanford Law School, as well as the inaugural Warren Christopher Professor of the Practice of International Law and Diplomacy, a chair held jointly by FSI and the Stanford Law School. He is also an affiliated faculty member at CISAC. His expertise is in the field of public international law and the foreign relations law of the United States. His work focuses on the effect of positive international law rules on the conduct of foreign relations and other implications for the behavior of states, courts (both national and international), and other international actors. Current research interests focus on international law and the response to the contemporary security threats of international terrorism and the proliferation of weapons of mass destruction. He teaches courses in public international law and international criminal law at Stanford Law School. Before coming to Stanford, Weiner served for 12 years as a career attorney in the U.S. Department of State. He served in the Office of the Legal Adviser in Washington, D.C. (1990-1996) and at the U.S. Embassy in The Hague (1996-2001), most recently as legal counselor, in which capacity he served as the U.S. Government's principal day-to-day interlocutor with the international legal institutions in The Hague, including the International Court of Justice, the International Criminal Tribunal for the Former Yugoslavia, and the Iran-United States Claims Tribunal. He received a BA from Harvard College and a JD from Stanford Law School.

Roger Speed is a physicist formerly with the Lawrence Livermore National Laboratory and now an affiliate of CISAC. He has also worked at the National Academy of Sciences, at R&D Associates, and, as a Peace Fellow, at the Hoover Institution, where he wrote a book on strategic nuclear policy. He has served on a number of defense-related committees, including ones for the Office of Undersecretary of Defense for Policy, the American Physical Society, the U.S. Navy (Non-Acoustic ASW Panel), the National Academy of Sciences, and the Air Force Space and Missile Systems Organization. He has conducted a broad range of national security studies for the Department of Defense, Department of Energy, and Central Intelligence Agency in such areas as arms control, strategic deterrence, nuclear war, ballistic missile defense, nuclear weapons safety, and the survivability of strategic systems.