Introduction Steve Smith, Ken Booth, and Marysia Zalewski; Part I. Debates: 1. Positivism and beyond Steve Smith; Part II. Legacies: 2. The timeless wisdom of realism? Barry Buzan; 3. The growing relevance of pluralism? Richard Little; 4. The interstate structure of the modern world system Immanuel Wallerstein; 5. The accomplishments of international political theory Stephen Krasner; 6. The continued significance of positivism Michael Nicholson; Part III. Silences: 7. The rise and fall of the inter-paradigm debate Ole Weaver; 8. Margins, silences and bottom rungs: how to overcome the underestimation of power in the study of international relations Cynthia Enloe; 9. Is there a classical international theory? Robert Jackson; Part IV. Openings: 10. Authoritarian and liberal militarism: a contribution from comparative and historical sociology Michael Mann; 11. The achievements of post-structuralism Richard Ashley; 12. The contributions of feminist theories to international relations Christine Sylvester; 13. The achievements of critical theory Andrew Linklater; Part V. Directions: 14. The last post? Martin Hollis; 15. Probing puzzles persistently: a desirable but improbable future for IR theory James Rosenau; 16. The future of international relations: fears and hopes Fred Halliday; 17. Seventy-five years on: rewriting the subject's past - reinventing its future Ken Booth; 18. 'All these theories yet the bodies keep piling up': theory, theorists, theorising Marysia Zalewski.