Introduction: custom's future Curtis A. Bradley; 1. Custom's past Emily Kadens; 2. Customary international law adjudication as common law adjudication Curtis A. Bradley; 3. Customary international law as a dynamic process Brian D. Lepard; 4. Custom, jus cogens, and human rights John Tasioulas; 5. Customary international law: how do courts do it? Stephen J. Choi and Mitu Gulati; 6. Custom's method and process: lessons from humanitarian law Monica Hakimi; 7. The growing obsolescence of customary international law Joel P. Trachtman; 8. The strange vitality of custom in the international protection of contracts, property, and commerce C. L. Lim; 9. The decline of customary international law as a source of international criminal law Larissa van den Herik; 10. Customary international law and public goods Niels Petersen; 11. Reinvigorating customary international law Andrew T. Guzman and Jerome Hsiang; 12. The evolution of codification: a principal-agent theory of the international law commission's influence Laurence R. Helfer and Timothy Meyer; 13. Custom and informal international lawmaking Jan Wouters and Linda Hamid; 14. Custom's bright future: the continuing importance of customary international law Omri Sender and Michael Wood.