A form of arbitration conducted with the support of, and according to the rules of, an arbitral institution. The arbitral institution administers various aspects of the arbitration, such as the appointment of arbitrators, arbitrator challenges and collection of arbitrators' fees. For an analysis of the advantages and disadvantages of ad hoc versus administered arbitration, see Practice note, Ad hoc arbitrations without institutional support. For a comparative guide of the major arbitration institutions, see Practice note, Major international commercial arbitration rules: comparison and key features.