Customary International Law
- Customary international law — State practice — Opinio juris — Codification — Soft law — Judicial decisions — General principles of international law — Responsibility of international organizations — Membership of international organizations — Treaties, effect for third states — Vienna Convention on the Law of Treaties — State succession, international agreements
Published under the auspices of the Max Planck Foundation for International Peace and the Rule of Law under the direction of Rüdiger Wolfrum.
1 The expression ‘customary international law’ concerns, on the one hand, the process through which certain rules of international law are formed, and, on the other, the rules formed through such a process. While these rules are not necessarily general in scope, all existing general rules of international law are customary (see paras 35–40 below; see also General International Law [Principles, Rules and Standards]).2 Even though language is necessary to communicate their content, expression through language is not an indispensable element of customary...