Contents -- The Essence of Millennial Reflections on International Studies: Realism and Institutionalism -- Realism -- Realism, the Real World, and the Academy -- Modern Realist Theory and the Study of International Politics in the Twenty-first Century -- Realism and the Study of Peace and War -- Performance and Perils of Realism in the Study of International Politics -- Realism and the Democratic Peace: The Primacy of State Security in New Democracies -- Systemism and International Relations: Toward a Reassessment of Realism -- lnstitutionalism -- Progress in International Relations: Beyond Paradigms in the Study of Institutions -- Institutional Theory in International Relations -- Transnational Relations, Interdependence, and Globalization -- Are Institutions Intervening Variables or Basic Causal Forces? Causal Clusters versus Causal Chains in International Society -- Contributors.