What is separation of powers?
The state has three big jobs: making laws, running the country and judging disputes. Separation of powers means giving these jobs to three different branches (organs), run by different people.
Why? If one person or group holds all three, there is nobody to stop them from misusing power. Splitting power protects people's rights and freedom.
The French thinker Montesquieu explained this idea in 1748. Earlier, John Locke had also argued that law-making and law-carrying-out should be separate. Today most constitutions follow some version of it.
The three branches
Legislature (makes laws)
An elected body: parliament, congress or assembly. It debates and passes laws, approves the budget and questions ministers. Many have two houses.
Executive (carries out laws)
The head of state, head of government, ministers, and the civil service, police and army. It runs daily government and puts laws into action.
Judiciary (judges)
Courts and judges. They explain what laws mean, settle disputes and decide if someone broke the law. Courts must be independent: judges cannot be sacked for giving a decision the government dislikes, and trials must be fair and public. Some countries also use lay judges or juries: ordinary citizens who help decide cases.
Checks and balances
Separation alone is not enough; each branch also checks the others so they stay balanced.
- The legislature can question, reject the budget of, or remove the government (no-confidence vote) and can impeach a president or judge through a strict process.
- The executive (head of state) can return or veto a bill, and often appoints judges.
- The judiciary can strike down laws or government actions that break the constitution. This is called judicial review.
- Above all is the constitution, and the people, who vote in elections.
Parliamentary and presidential systems
Parliamentary system (e.g. India, UK, Germany, Japan): the government comes from the majority in parliament and must keep its support. Legislature and executive overlap. There is often a separate ceremonial head of state (president or monarch).
Presidential system (e.g. USA, Brazil, Mexico): the president is elected separately, is not a member of the legislature and serves a fixed term. Separation is stricter.
Semi-presidential (e.g. France, Poland in part): an elected president shares power with a prime minister.
Power can also be split vertically: national, regional (states) and local government. This is federalism and local self-government.
Try it
In free play, raise only the Executive to 5. What happens to the roof? Now find one way to level it by moving the other two pillars. At home, read one news story and decide: which branch acted here, and did another branch check it?
Key formulas and definitions
- Legislature = makes laws · Executive = carries out laws · Judiciary = interprets laws, settles disputes
- Separation of powers + checks and balances = limited government
- Judicial review: courts can cancel unconstitutional laws
- Parliamentary: executive from and answerable to legislature
- Presidential: executive elected separately, fixed term
- Vertical sharing: national · regional · local
Worked examples
1. Parliament passes a law, the police enforce it, and a court fines someone for breaking it. Name the branch at each stage.
Parliament = legislature; police = executive; court = judiciary.
2. A court cancels a law because it takes away free speech guaranteed by the constitution. What is this power called and which branch is checked?
Judicial review; the judiciary checks the legislature.
3. In country X, the prime minister must resign if parliament passes a no-confidence vote. Is it parliamentary or presidential? Why?
Parliamentary: the executive depends on the support of the legislature.
Common mistakes
- Thinking police are part of the judiciary. Police carry out the law, so they belong to the executive.
- Saying separation means the branches never interact. They check each other all the time.
- Believing the president always holds the most power. In parliamentary systems the prime minister leads the government.
- Forgetting that courts must be independent: judges should not fear losing their job for a decision.