Part I. Custom and Morality: Natural Law, Customary Law, And Ius Gentium 1. Pitfalls in the interpretation of customary law / Frederick Schauer
2. The moral role of conventions / Ross Harrison
3. Habit and convention at the foundation of custom / James B. Murphy
4. Custom, ordinance and natural right in Gratian's Decretum / Jean Porter
5. Vitoria and Suarez on Ius Gentium Natural Law, and Custom / Brian Tierney
6. Custom and positivity: an examination of the philosophic ground of the Hegel-Savigny controversy / Christoph Kletzer
Part II. Custom and Law: Custom, Common Law, and Customary International Law 7. Custom in medieval law / David Ibbetson
8. Siege warfare in the early modern age: a study on the customary laws of war / Randall Lesaffer
9. The idea of common law as custom / Alan Cromartie
10. Three ways of writing a treatise on public international law: textbooks and the nature of customary international law / Amanda Perreau-Saussine
11. Custom, common law reasoning and the law of nations in the nineteenth century / Michael Lobban
12. Custom in international law: a normative practice account / Gerald J. Postema
13. Customary international law and the quest for global justice / John Tasioulas.