Regime theory is another approach that explains cooperation in international relations. In a world of anarchy among sovereign states, the basic function of regimes is to coordinate how states behave to realize desired outcomes in issue areas. For example, states get together and cooperate in such issue areas as financial or security issues (to create a “security regime”), or even in nuclear safety issues. Stephen Krasner defines a regime as those “sets of implicit or explicit principles, norms, rules, and decision making procedures around which actors’ expectations converge in each area of international relations” (Krasner, 1983, 2)