 The analysis of nuclear conflict was also responsible for many of the early developments in cooperative game theory. Among the earliest examples of this kind of work was Lloyd Shapley and Martin Shubik’s effort to predict the behavior of members of the United Nations Security Council (Shapley &amp; Shubik 1954). The Shapley-Shubik power index quantifies the likelihood that any given member of a voting body casts a deciding vote. This provides a measure of the influence of each member and helps us analyze how likely various coalitions are to form, how stable those coalitions will be, and how the gains secured by a winning coalition will be distributed.