International relations theories : discipline and diversity Introduction: Diversity and disciplinarity in international relations theory Steve Smith International relations and social science Milja Kurki and Colin Wight Normative international relations theory Toni Erskine Classical realism Richard Ned Lebow Structural realism John J. Mearsheimer Liberalism Bruce Russell Neoliberalism Jennifer Sterling Folker The English school Tim Dunne Marxism Mark Rupert Critical theory Steven C. Roach Constructivism K. M. Fierke Feminism J. Ann Tickner and Laura Sjoberg Poststructuralism David Campbell Postcolonialism Siba N. Grovogui Green theory Robyn Eckersley International relations theory and globalization Colin Hay Still a discipline after all these debates Ole Waever Glossary