A Benelux Parliament (originally referred to as "Interparliamentary Consultative Council") was created in 1955. This parliamentary assembly is composed of 21 members of the Dutch parliament, 21 members of the Belgian national and regional parliaments, and 7 members of the Luxembourgish parliament. The treaty establishing the Benelux Economic Union ("Benelux Economische Unie/Union Économique Benelux") was signed 3 February 1958 and came into force in 1960 to promote the free movement of workers, capital, services, and goods in the region. Its secretariat-general is located in Brussels. 