Referendums in Ireland

In Ireland, direct elections by universal suffrage are used for the President, the ceremonial head of state; for Dáil Éireann, the lower house of the Oireachtas or parliament; for the European Parliament; and for local government. All elections use the single transferable vote (STV) in constituencies returning three or more members, except that the presidential election and by-elections use the single-winner analogue of STV, elsewhere called instant-runoff voting or the alternative vote. Members of Seanad Éireann, the upper house of the Oireachtas, are partly nominated, partly indirectly elected, and partly elected by graduates.

STV is a form of proportional representation, and coalition governments have been the rule since 1989. Fianna Fáil and Fine Gael were the largest parties in every general election from 1927 to 2007, with the Labour Party usually third. Smaller parties and independents exist in the Dáil and more so in local government.

Residents of the state who are Irish citizens or British citizens may participate in elections to the national parliament. Residents who are citizens of any EU state may vote in European Parliament elections, while any resident, regardless of citizenship, may participate in local elections.

...
Wikipedia