“…A substantial literature on "regime effectiveness" explores these issues both theoretically and empirically, with an emphasis on environmental issues (Young, 1999;Miles et al, 2002;Helm and Sprinz, 2000). Many IGOs have been subject to systematic assessments of their effectiveness, including the IMF (Vreeland, 2003), the World Bank (Flores and Nooruddin, 2009), and the UN in its peacekeeping role (Fortna, 2008), and there is increased interest in studying the performance of IGOs (Gutner and Thompson, 2010). These studies pose various methodological problems, as it is often difficult to discern the causal impact of a particular organization or set of rules in a context where many political and economic factors are at play.…”