Explain the separation of powers into legislative, executive and judicial branches and the role of checks and balances.

What this dot point is asking

This dot point asks you to explain the three branches of government, why power is separated, and how checks and balances keep that power limited.

The three branches

Government power in Australia is divided into three functions:

• The legislature is parliament, which makes and changes the law. Federally this is the Commonwealth Parliament; in Tasmania it is the House of Assembly and the Legislative Council.
• The executive carries out and administers the law. This includes the Prime Minister or Premier, the Cabinet, government departments and the public service. Formally, executive power is vested in the Crown and exercised by the Governor-General or Governor on the advice of ministers.
• The judiciary interprets the law and resolves disputes through the courts, from the Magistrates Court up to the High Court of Australia.

Why power is separated

The principle rests on a suspicion of concentrated power. If one person or group controlled law-making, enforcement and judgment, there would be nothing to stop tyranny. By splitting these functions, each branch can act as a brake on the others. The Australian Constitution reflects this structure: Chapter I deals with the Parliament (legislative power), Chapter II with the Executive Government, and Chapter III with the Judicature (judicial power).

How strict is the separation in Australia?

The separation is not complete. Australia uses the Westminster system, in which the executive is drawn from the legislature: ministers must be members of parliament, so the legislative and executive branches overlap in personnel. The strongest separation is between the judiciary and the other two branches. The High Court has firmly protected judicial independence, holding that Commonwealth judicial power can only be exercised by Chapter III courts. Judicial independence is reinforced by secure tenure and the fact that judges cannot be removed except by parliament for proven misbehaviour or incapacity.

Checks and balances

Checks and balances are the mechanisms that let each branch limit the others, ensuring no branch acts beyond its proper authority. Examples in Australia include:

• The judiciary checks the legislature and executive through judicial review. Courts can declare a law invalid if it exceeds constitutional power, and can find executive action unlawful.
• The legislature checks the executive through responsible government: ministers must answer to parliament, and the government must keep the confidence of the lower house.
• The upper house (the Senate federally, the Legislative Council in Tasmania) reviews and can amend or reject legislation passed by the lower house.
• The executive, through the Crown's representative, gives royal assent to bills and can in limited circumstances dissolve parliament.

These overlapping controls mean that ambition is made to counter ambition, so power is dispersed rather than concentrated.

For exam answers, name and define the three branches, explain the rationale of preventing concentrated power, then describe at least two specific checks and balances, noting that the judiciary is the most clearly separated branch in the Australian system.