This volume provides the most comprehensive and authoritative projections of nuclear proliferation over the next decade and offers a range of practical nonproliferation measures. The authors address a set of overarching questions regarding the propensity of selected states from different regions of the world to "go nuclear," the sources of national decisions to do so, and the potential for one state's proliferation behavior to impact on that of other states. In addition, authors address the most effective policy tools available for impeding nuclear weapons spread. Although this volume is not the first effort to look systematically and comparatively at nuclear decision-making, it is unique in its combination of future orientation, comparative perspective, and emphasis on harnessing the insights from social science theory and country case studies to aid policy makers in forecasting nuclear proliferation developments.