The growing technical uncertainties and complexities of problems of global concern have made international policy coordination not only increasingly necessary but also increasingly difficult. If decision makers are unfamiliar with the technical aspects of a specific problem, how do they define state interests and develop viable solutions? What factors shape their behavior? Under conditions of uncertainty, what are the origins of international institutions? And how can we best study the processes through which international policy coordination and order emerge? While a variety of analytic approaches have been used to address the problems of international cooperation, the approaches have yielded only fragmentary insights. At its core, the study of policy coordination among states involves arguments about determinism versus free will and about the ways in which the international system is maintained and transformed. Among the overlapping topics of debate are whether national behavior is determined or broadly conditioned by system-level factors, unit-level factors, or some complex interplay between the two; whether state policymakers can identify national interests and behave independently of pressures from the social groups they nominally represent; and whether states respond consistently to opportunities to create, defend, or expand their own wealth and power, to enhance collective material benefits, or to promote nonmaterial values.' A related question of