PCA tribunals have jurisdiction for disputes based on the PCA founding documents (the Conventions on Pacific Settlement of International Disputes), or based on
bilateral and
multilateral treaties. While the PCA's initial activity principally concerned the settlement of disputes involving only States, through arbitration and other peaceful means such as conciliation, mediation, and fact-finding, the PCA Founding Conventions of 1899 and 1907 established a flexible framework. Over time, the PCA's Contracting Parties, in keeping with the evolving needs of the international community, have interpreted the Court's mandate to include disputes involving various combinations of States, State entities, international organizations, and private parties. File:Hearing in PCA Case 2016-10, the Timor Leste Conciliation (Timor-Leste v. Australia) - Photo 1.jpg File:Meeting in PCA Case 2013-14, SPRFMO Review Panel.jpg File:Public Hearing in PCA Case 2012-04.jpg
Appointing authority The PCA Secretary General furthermore acts as an appointing authority for arbitration. When problems arise in designating arbitrators for an arbitration under
UNCITRAL arbitration rules (e.g. because one of the parties refuses to designate an arbitrator, or when the designated arbitrators are unable to agree on designation of a third arbitrator), the PCA Secretary-General may be requested to serve as an appointing authority. This option is also open for other arbitration agreements, in which the Secretary-General is designated. Between 2011 and 2015, 257 such requests were submitted.
Interstate arbitration based on UNCLOS The
United Nations Convention on the Law of the Sea (UNCLOS) provides for a dispute resolution mechanism regarding maritime boundaries in which member states can choose one of the following: •
International Tribunal for the Law of the Sea •
International Court of Justice, • arbitral tribunal (constituted in accordance with Annex VII, UNCLOS) • a special arbitral tribunal (constituted in accordance with Annex VIII). If two member states have elected different dispute resolution measures, the third option is to be used. As of 2025, the PCA has administered 14 of the 15 cases initiated by states under Annex VII to the
UNCLOS.
Investor–state investment disputes Many
free trade agreements provide for a mechanism to resolve disputes between investors and states through arbitration through so-called investor-state dispute settlement (
ISDS) clauses. The PCA may play a role in such proceedings as appointing authority for arbitrators, by use of its arbitration rules or by providing support to the arbitration case.
Conciliation Conciliation has formed part of the PCA’s activities since 1937, when the Administrative Council formally incorporated conciliation within the PCA’s mandate. The PCA subsequently adopted rules of procedure to facilitate conciliation proceedings. More recently, the PCA supported the conciliation proceedings between Timor-Leste and Australia concerning their maritime boundary in the Timor Sea between 2016 and 2018, which resulted in the conclusion of a maritime boundaries treaty between the parties.
Commissions of Enquiry The PCA may also assist parties in establishing commissions of inquiry or other fact-finding mechanisms. Historically, such procedures have been used to clarify disputed factual circumstances between States, including in the 1905 Dogger Bank inquiry between Great Britain and Russia conducted under the auspices of the Hague Conventions. Fact-finding mechanisms remain available to parties who wish to establish an objective record of facts that may facilitate the resolution of a dispute. ==Procedure==