Offers an explanation for the occurrence of secessionist conflict, based on a comparative study of numerous historical examples.

Part I: 1. Introduction; 2. Theoretical foundation for analysis of secession; Part II. The Costs and Benefits: 3. The benefits of membership; 4. The costs of secession; 5. The costs of membership; 6. The benefits of secession; Part III. The Dynamic of Secession: 7. 'Last resorts': a rise in the costs of membership; 8. 'Opportune moments': a reduction in the costs of secession; 9. A reduction in the benefits of membership; 10. A rise in the benefits of secession; 11. Conclusion.