Introduction; 1. The concept of obligation; 2. Contemporary approaches to legal obligations: a preliminary map; 3. The social-practice account; 4. The interpretivist account; 5. The conventionalist reason account; 6. The exclusionary reason account; 7. A revisionary Kantian conception; 8. Further dimensions of the revisionary Kantian conception; 9. The robust reason account; 10. The method of presuppositional interpretation; Conclusion.