An ICJ chamber is a smaller bench of judges formed within the International Court of Justice to hear a specific case or category of cases, rather than the full Court of 15 judges. The legal basis is found in Articles 26–29 of the ICJ Statute, which authorize three types of chambers:
- Chambers of summary procedure (Article 29), composed of five judges, designed to dispose of cases quickly.
- Standing specialized chambers (Article 26(1)) for particular categories of cases, such as labor or communications disputes. In 1993 the Court created a Chamber for Environmental Matters, though no state ever referred a case to it and it was discontinued in 2006.
- Ad hoc chambers (Article 26(2)) formed at the request of the parties to hear a specific dispute, with the composition approved by the parties.
Ad hoc chambers are the most frequently used. The parties effectively influence which judges sit, which makes the procedure attractive to states that want a more arbitration-like experience while still using the ICJ. Judgments rendered by a chamber are considered judgments of the Court itself under Article 27 of the Statute, carrying the same binding force under Article 94 of the UN Charter.
The first ad hoc chamber was constituted for the Gulf of Maine case (Canada/United States, judgment 1984), which delimited the maritime boundary in the Gulf of Maine area. Other notable chamber cases include Frontier Dispute (Burkina Faso/Mali) (1986), ELSI (United States v. Italy) (1989), and Land, Island and Maritime Frontier Dispute (El Salvador/Honduras: Nicaragua intervening) (1992).
Critics argue chambers risk fragmenting the Court's jurisprudence and allow forum-shaping by powerful litigants. Defenders note chambers have helped attract bilateral boundary disputes that might otherwise have gone to arbitration, keeping the ICJ relevant in territorial and maritime delimitation.
Example
In 1982 the ICJ constituted its first ad hoc chamber under Article 26(2) to hear the Gulf of Maine maritime boundary case between Canada and the United States, delivering judgment in 1984.