Over the past fifteen years, The Spread of Nuclear Weapons has been a staple in International Relations courses because of its brevity and crystal-clear explanations. The new edition, An Enduring Debate, continues the important discussion of nuclear proliferation and the dangers of a nuclear-armed world. With new chapters on the questions surrounding a nuclear North Korea, Iran, and Iraq and the potential for a world free of nuclear weapons, this Third Edition will continue to generate a lively classroom experience.

In what Stanley Hoffmann, writing in "The New York Review of Books," has called a "fine analysis and critique of American targeting policies," Sagan looks more at the operational side of nuclear strategy than previous analysts have done, seeking to bridge the gap between theory and practice.

Environmental tragedies such as Chernobyl and the "Exxon Valdez" remind us that catastrophic accidents are always possible in a world full of hazardous technologies. Yet, the "apparently" excellent safety record with nuclear weapons has led scholars, policy-makers, and the public alike to believe that nuclear arsenals can serve as a secure deterrent for the foreseeable future. In this provocative book, Scott Sagan challenges such optimism. Sagan's research into formerly classified archives penetrates the veil of safety that has surrounded U.S. nuclear weapons and reveals a hidden history of frightening "close calls" to disaster.