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Article

Kyle Beardsley, Patrick James, Jonathan Wilkenfeld, and Michael Brecher

Over the course of more than four decades the International Crisis Behavior (ICB) Project, a major and ongoing data-gathering enterprise in the social sciences, has compiled data that continues to be accessed heavily in scholarship on conflict processes. ICB holdings consist of full-length qualitative case studies, along with an expanding range of quantitative data sets. Founded in 1975, the ICB Project is among the most visible and influential within the discipline of International Relations (IR). A wide range of studies based either primarily or in part on the ICB’s concepts and data have accumulated and cover subjects that include the causes, processes, and consequences of crises. The breadth of ICB’s contribution has expanded over time to go beyond a purely state-centric approach to include crisis-related activities of transnational actors across a range of categories. ICB also offers depth through, for example, potential resolution of contemporary debates about mediation in crises on the basis of nuanced findings about long- versus short-term impact with regard to conflict resolution.

Article

The balance of conventional military capabilities is intrinsic to understanding patterns of war among nations. However, cumulative knowledge relating to the effects of nuclear weapons possession on conflict interaction is largely absent. Framework is provided for analyzing the results of quantitative empirical research on this question and to identify any extant strong and consistent patterns in the interactions of states that can be associated with the possession of nuclear weapons. Since 1945, a vast, sophisticated, and contradictory literature has developed on the implications of nuclear weaponry for patterns of international conflict and war. This theoretical and empirical work has principally focused on the conflict effects of these weapons for the interaction of nuclear-armed states, although a growing number of studies have explored the impact of a state’s possession of nuclear weapons on the behavior of nonnuclear opponents. Given the destructive capacity of these weapons and their questionable value for battlefield use, most of this work has concentrated on the requirements for successful deterrence. In categorizing the studies, some scholars note that “classical deterrence theory” derives from the Realist paradigm of international politics and subdivide this theory into two complementary strands: structural (or neorealist) deterrence theory and decision-theoretic deterrence theory. In contrast, other analysts choose to classify work on nuclear deterrence into three schools of thought: nuclear irrelevance; risk manipulation, escalation, and limited war; and the nuclear revolution. The essence of these divisions involves a debate about what the possession of nuclear weapons does for a state that controls them. Does the possession of these weapons affect the behavior of nuclear and nonnuclear opponents in disputes over contested values? Do the weapons impart political influence and hold military utility, or are they useless as tools for deterrence, compellence, or war?

Article

Frank C. Zagare

Perfect deterrence theory and classical deterrence theory are two theoretical frameworks that have divergent empirical implications and dissimilar policy recommendations. In perfect deterrence theory, threat credibility plays a central role in the operation of both direct and extended deterrence relationships. But credible threats are neither necessary nor sufficient for deterrence to prevail, and under certain conditions, the presence of a credible threat may actually undermine deterrence. In perfect deterrence theory, the cost of conflict and status quo evaluations are also important strategic variables. Classical deterrence theorists tend to fixate on the former and ignore the latter. This theoretical oversight precludes a nuanced understanding of the dynamics of deterrence.