Adjudication

In international law, adjudication refers to the settlement of a dispute by an impartial third-party court or tribunal that issues a legally binding judgment. It is listed alongside negotiation, mediation, conciliation, and arbitration as one of the peaceful means of dispute settlement in Article 33(1) of the UN Charter.

Adjudication differs from arbitration in several ways. Arbitration is ad hoc: the parties typically choose the arbitrators, define the procedural rules, and frame the questions. Adjudication occurs before a standing judicial body with pre-existing jurisdiction, procedures, and bench, such as the International Court of Justice (ICJ), the International Tribunal for the Law of the Sea (ITLOS), the WTO Appellate Body, or regional courts like the European Court of Human Rights and the Inter-American Court of Human Rights.

Key features include:

• Consent-based jurisdiction. States must consent to a court's jurisdiction, whether through a compromissory clause in a treaty, a special agreement (compromis), or an optional clause declaration under Article 36(2) of the ICJ Statute.
• Binding outcome. Under Article 94 of the UN Charter, members undertake to comply with ICJ decisions in cases to which they are parties.
• Application of law. Tribunals decide secundum legem, applying treaties, custom, general principles, and subsidiary sources as listed in Article 38(1) of the ICJ Statute.
• Res judicata. Judgments are final and not subject to appeal at the ICJ (Article 60).

Domestically, adjudication describes the judicial function more broadly: a neutral judge applies law to facts after adversarial proceedings. In administrative law, it also covers quasi-judicial decisions by agencies.

Limitations are well-documented. Enforcement remains weak: the ICJ relies on Security Council action under Article 94(2), which can be vetoed. States may withdraw consent, as the United States did with the ICJ's compulsory jurisdiction in 1986 following Nicaragua v. United States. Despite these constraints, adjudication remains central to the rule of law in international relations.