Government of Australia
The Commonwealth Parliament and all the state and territory legislatures use the Westminster system. They have a recognised Leader of the Opposition, usually the leader of the largest party outside the government. There is also a Shadow Cabinet of Opposition members who "shadow" each member of the Ministry, asking questions on matters about the Minister's responsibilities. The government, because it has a majority of members in the lower house of the legislature, can usually pass its legislation and control the workings of the house. The Opposition can slow down the process and obstruct government business if it chooses. The day-to-day business of the house is usually worked out between a senior Minister, who holds the title Leader of the House, and an Opposition frontbencher known as the Manager of Opposition Business.