American constitutionalism / Richard S. Kay -- Constitutional authorship / Frank I. Michelman -- What is "the Constitution"? (and other fundamental questions) / Michael J. Perry -- On the authority and interpretation of constitutions : some preliminaries / Joseph Raz -- Legitimacy and interpretation / Jed Rubenfeld -- The domain of constitutional justice / Lawrence Sager -- Precommitment and disagreement / Jeremy Waldron.