In addition to administering proceedings under the ICSID rules, the Centre is also available to administer arbitration cases under other rules, such as the UNCITRAL Arbitration Rules and ad hoc investor-State and State-State cases. These non-ICSID cases are submitted to ICSID by agreement of the parties either prior to the constitution of the Tribunal or once the Tribunal is constituted. On occasion, the Secretary-General of ICSID also serves as appointing authority of an arbitrator.
The services rendered by the Centre in non-ICSID cases may range from limited assistance with the organization of hearings and management of the case finances to full secretariat services in the administration of the case concerned. Parties and Tribunals are free to elect the extent of the services desired.