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COMMONWEALTH ELECTIONS

Generally, the 150 members of the House of Representatives, half of the 72 state senators and the four territory senators are elected approximately every three years.

Voting methods

Members of the House of Representatives are elected by voters using the alternative vote electoral system (known in Australia as 'preferential voting'); Senators are elected by voters using the voting method known as proportional representation (single transferable vote variant).

Franchise

Any Australian citizen aged 18 years and over, or British subject who was on the Commonwealth Roll as at 25 January 1984, is qualified to enrol and vote at Commonwealth elections. Residence in a particular electorate for at least a period of one month is also a requirement. Enrolment and attendance at a polling place on polling day (except under certain lawful exceptions) are compulsory for all eligible persons.

Parliamentary terms

Members of the House of Representatives are elected for a maximum term of three years, though elections may be called earlier. Senators have fixed terms of six years. Normally half the Senate retires every three years, and half-Senate elections are usually held at the same time as elections for the House of Representatives, though they need not be. The most recent separate elections for each house occurred in 1970 (Senate) and 1972 (House of Representatives).

At times of disagreement between the House of Representatives and the Senate, the two houses may be dissolved and an election called for both. Of the 41 Commonwealth elections, six have been 'double dissolution' elections, the most recent of which occurred in 1987.

There have been 41 parliaments since Federation. The longest parliament was the third, which ran from 20 February 1907 to 19 February 1910, and the shortest was the eleventh, which ran from 6 February to 16 September 1929.

The 42nd Parliament will be required to meet within 30 days of the day appointed for the return of the electoral writs in the 24 November 2007 election. For details of the 2007 election, see <http://www.aec.gov.au>.

4.3 ENROLMENT AND ELECTORATES - September 2007
	Electors enrolled	Electorates
New South Wales	4 427 750	50
Victoria	3 405 034	37
Queensland	2 563 107	28
Western Australia	1 291 530	15
South Australia	1 068 153	11
Tasmania	346 896	5
Northern Territory	113 238	2
Australian Capital Territory	235 001	2
Total	13 450 709	150
Source: Australian Electoral Commission.