Electoral system of Australia

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The electoral system used for the election of members of the Australian Parliament is governed primarily by the Commonwealth Electoral Act 1918. The system at present has a number of distinctive features including compulsory enrolment; compulsory voting; majority-preferential instant-runoff voting in single-member seats to elect the lower house, the House of Representatives; and the use of the single transferable vote proportional representation system to elect the upper house, the Senate. The timing of elections is governed by the Constitution and political conventions. Generally, elections are held approximately every three years and are conducted by the independent Australian Electoral Commission (AEC).

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