INTRODUCTION. -- Neoliberalism, Neorealism, and world politics. -- II.THE NEOLIBERAL CHALLENGE AND NEOREALIST RESPONSE. -- Coordination and collaboration: regimes in an anarchic world. -- International cooperation in economic and security affairs. -- Achieving cooperation under anarchy: strategies and institutions. -- Anarchy and the limits of cooperation: a realist critique of the newest liberal institutionalism. -- III. EXTENSION OF THE DEBATE. -- The assumption of anarchy in international relations theory: a critique. -- Relative gains and the pattern of international cooperation. -- Absolute and realtive gains in international relations theory. -- Global communications and national power: life on the pareto frontier. -- Do relative gains matter? american´s response to japanese industrial policy. -- REFLECTIONS ON THE DEBATE.-- Institutional theory and the realist challenge after the cold war. -- Understanding the problem of international cooperation: the limits of neoliberal institutionalism and the future of realist theory.