Despite its widespread use in studies of domestic political institutions, the concept of “independence” has not been systematically applied to the study of international institutions. Most arguments regarding the ability of international organizations (IOs) to promote cooperation and mitigate conflict rely on the implicit assumption that such institutions possess some independence from states, and yet the field has failed to conceptualize—let alone measure—this institutional characteristic. Extracting insights from the theoretical literatures on both international and domestic institutions, the authors distill several design features that lend independence to political institutions and then generate coding rules for measuring the independence of IOs. Based on an original data set of regional integration arrangements, the authors then use regression analysis to test several propositions for explaining variation in IO independence, shedding light on some important theoretical and empirical puzzles in international relations.

Does institutional variation have implications for questions of conflict and peace? Theory indicates that it does, but extant studies that address this question treat such institutions as homogenous. Building on recent theoretical advances, I argue that cooperation on a wide array of economic issues and regular meetings of high-level officials provide member-states with valuable information regarding the interests and resolve of their counterparts. This, in turn, reduces uncertainty and improves the prospects of a peaceful resolution of interstate disputes. To test the effect of these two institutional features on the level of militarized interstate disputes (MIDs), I present an original data set that measures variation in institutional design and implementation across a large number of regional integration arrangements (RIAs) in the 1980s and 1990s. Employing multivariate regression techniques and the regional unit of analysis, I find that a wider scope of economic activity and regular meetings among high-level officials mitigate violent conflict. These results remain intact after controlling for alternative explanations and addressing concerns of endogeneity.Earlier drafts of this paper were presented at the 45th Anual Convention of the International Studies Association, Montreal, March 16–20, 2004 and at the 100th Annual Meeting of the American Political Science Association, Chicago, September 2–5, 2004. For helpful comments and suggestions I thank the editor and two anonymous referees of this journal, as well as Paul Fritz, Yoav Gortzak, Edward Mansfield, Timothy McKeown, Brian Pollins, Peter Rosendorff, Donald Sylvan, Alex Thompson, and Peter Trumbore.

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