To become Prime Minister, a person must be a member of the House of Representatives and be able to command the confidence of the majority of its members. Typically, the leader of the political party that wins the most seats in the House of Representatives is appointed as Prime Minister by the Governor-General.
The Prime Minister is the head of government and is responsible for appointing the Cabinet, which is made up of other members of the House of Representatives. The Cabinet is collectively responsible for the policies and actions of the government.
The Prime Minister's term of office is five years, unless Parliament is dissolved earlier. A general election must be held within three months of Parliament being dissolved.