In The Spread of Nuclear Weapons: A Debate Renewed, professors Waltzand Sagan resume their well-known dialogue concerning nuclearproliferation and the threat of nuclear war. Kenneth Waltz, Dean ofRealist Theory in international relations at Columbia University,expands on his argument that "more may be better," contending that newnuclear states will use their acquired nuclear capabilities to deterthreats and preserve peace. Scott Sagan, the leading proponent oforganizational theories in international politics, continues to makethe counterpoint that "more will be worse": novice nuclear states lackadequate organizational controls over their new weapons, resulting in ahigher risk of either deliberate of accidental nuclear war. Treatingissues from the 'long peace' between the United States and Soviet Unionmade possible by the nuclear balance of the Cold War to more moderntopics such as global terrorism, missile defense, and theIndian-Pakistani conflict, The Spread of Nuclear Weapons: A DebateRenewed is an invaluable addition to any international relations course.