Part I: The Definition and Scope of Good Faith in Public International Law 1. The Role of Principles in the Body of Public International Law 2. The Three Meanings of Good Faith in Public International Law 3. The Degree of Normativity of the Principle of Good Faith 4. The Delimitation of Good Faith with Respect to Other Principles of International Law Part II: Good Faith in the Various Subject Areas of Public International Law 5. Good Faith and the Sources 6. Good Faith and the Jurisdiction of States 7. Good Faith in the Law of International Organisations 8. Good Faith in the Law of International Responsibility 9. Good Faith in the Law on the Peaceful Settlement of International Disputes 10. Good Faith in the International Law of Investments: Legitimate Expectations and Prohibition of Abuse of Procedure under ‘Fair and Equitable Treatment’ 11. Good Faith in the Law of Armed Conflicts: The Prohibition of Perfidy 12. Conclusion