The House of Assembly (lower house) comprises 47 members elected by preferential voting every 4 years from single member electorates. The Legislative Council (upper house) comprises 22 members elected by proportional representation of single transferable vote every 8 years. Queensland The Parliament of Queensland is unicameral, consisting of the Legislative Assembly of 93 members elected for a 4 year term from single member electorates using fully preferential voting. Western Australia The Parliament of Western Australia consists of the Legislative Assembly and the Legislative Council. The Legislative Assembly has 57 members elected for a four-year term, unless dissolved earlier, from single member electorates using fully preferential voting. The Legislative Council has 37 members elected for a fixed term of 4 years, in a 'whole of state' electorate using preferential proportional representation. Electoral Commissions Elections in Australia (Commonwealth, State or Territory) are organised by their respective electoral commissions, as follows: The Australian Electoral Commission (AEC) is the federal government agency responsible for organising, conducting and supervising federal elections, by-elections and referendums. The AEC is also responsible for setting electoral boundaries and redistributions, and maintains the Commonwealth electoral roll. State and Territory Electoral Commissions perform an equivalent role for State and Territory elections. The Australian electoral roll is also used by the state and territory Electoral Commissions to conduct State, Territory and local government elections, except Western Australia which maintains its own electoral roll. Voter enrollment Enrolment on the electoral roll, known in some other countries as registration, is compulsory for all Australian citizens aged 18 years and over. Residents in Australia who had been enrolled as British subjects on 25 January 1984 continue to be enrolled and vote. (Almost 163,000 voters were recorded as British subjects on the electoral roll in 2009.) Since 1984, eligible people have had seven days after a federal election is called to enrol or update address details. For the 2007 federal election, the deadline for new enrolments was reduced to 8 pm on the same business day as the issue of the writs, and 8 pm on the third business day to update address details. The deadline for enrolment is taken with reference to the date an election is called and not the actual election date, and a person not enrolled by the deadline cannot vote. Enrolment can be done online or by completing a form and sending it using regular mail, which must arrive by the