The Parliament of South Australia is the bicameral legislature of the Australian state of South Australia. It consists of the 47-seat House of Assembly (lower house) and the 22-seat Legislative Council (upper house). General elections are held every 4 years, with all of the lower house and half of the upper house filled at each election. It follows a Westminster system of parliamentary government with the executive branch required to both sit in parliament and hold the confidence of the House of Assembly. The parliament is based at Parliament House on North Terrace in the state capital of Adelaide. The King is represented in the State by the Governor of South Australia. According to the South Australian Constitution, unlike the federal parliament, and the parliaments of the other states of Australia, neither the Sovereign or the Governor is considered to be a part of the South Australian parliament. However, the same role and powers are granted to them. The parliament may make laws for any matter within South Australia, subject to the Constitution of South Australia. Its power is further limited by the ability for the federal parliament to override it in some circumstances, subject to the Constitution of Australia. Similarly, the Supreme Court of South Australia, and ultimately the High Court of Australia, provides judicial oversight of parliament. The parliament is also vested with other powers, such as the means to investigate matters, conduct research and summon witnesses. History Early colonial period and establishment At the founding of the Province of South Australia under the South Australia Act 1834, governance of the new colony was divided between the Governor of South Australia and a Resident Commissioner, who reported to a new body known as the South Australian Colonization Commission. Under this arrangement, there was also a governing Council comprising the Governor, the Judge or Chief Justice, the Colonial Secretary, the Advocate-General and the Resident Commissioner, with broad legislative and executive powers including the imposition of rates, duties, and taxes. This council was sometimes referred to as the "Legislative Council". Confusion and dispute about the division of power between the two roles led to the South Australia Government Act 1838, which combined the role of Resident Commissioner with that of the Governor. In 1842, the South Australia Act 1842 was passed in order to replace the South Australian Colonisation Commission appointed in 1834 with a more standard British model of