The United Nations Commission on International Trade Law, which is the principal legal organ of the United Nations in the field of international commercial law, empowered by the General Assembly to promote the progress of international commercial law’s harmonisation and unification. In this context, UNCITRAL has created several instruments in the field of arbitration, including arbitration rules applicable to ad hoc arbitrations and also used by certain arbitral institutions, and a model law on international commercial arbitration which has been totally or partially adopted by numerous States in their domestic laws.