On winning government, the political party (or a coalition of political parties) chooses one of its own, customarily the Leader of the party, to become Australian Prime Minister.
There is no fixed tenure for the position of Australian Prime Minister and any serving Australian Prime Minister may have his position challenged and removed from him by members of his party or coalition.
To win government a political party or a coalition of political parties must win a majority of the 150 seats in the Federal House of Representatives (the Lower House) of the Australian Parliament.
Each Member of the House of Representatives represents a separate Federal electoral division, constituted in approximately equal numbers of population.
Members of the Federal Government (House of Representatives and Senate), State, Territory and local governments are elected under a preferential system of voting which requires for election a majority of primary votes.
In cases where the primary votes are not enough to constitute a majority, a combination of primary and preferential votes are tallied until a majority of votes is achieved.
