Since the formation of the Irish Free State in 1922 and subsequently in the Republic of Ireland, the legislature of Ireland is known as the Oireachtas, and consists of the President; the upper house, Seanad Éireann (or Senate); and lower house, Dáil Éireann (Assembly, or House of Representatives). They are functionally similar to other bicameral parliaments, with the lower house being significantly more influential and having more power over the creation of legislation. Elections to Dáil Éireann are held at least every five years using the Single Transferable Vote; while Elections to Seanad Éireann are restricted to members of both houses, elected members of local authorities, and alumni of National University of Ireland colleges. 11 Senators are nominated directly by the Taoiseach.