The three branches and separation of powers
To stop power being misused, it is split into three parts (the separation of powers, an idea made famous by Montesquieu):
- Legislature (parliament, congress, national assembly): makes and changes laws, approves the budget and taxes, debates and questions the government, and in many countries approves treaties and top appointments.
- Executive (president or prime minister with ministers, plus the civil service): carries out laws, runs ministries, police and the army, makes foreign policy and proposes the budget.
- Judiciary (courts): settles disputes, interprets laws and checks that laws follow the constitution.
The head of state represents the country (signs laws, receives ambassadors). The head of government runs the government day to day. They can be one person (USA) or two (India, UK).
Checks and balances
Each branch has tools to limit the others:
- Executive → legislature: veto (refuse to sign a law), or in parliamentary systems ask for early elections.
- Legislature → executive: impeachment (removing a leader for serious wrongdoing), no-confidence vote, control of the budget, questions and committees.
- Judiciary → both: judicial review (declaring laws or actions unconstitutional).
- Executive and legislature → judiciary: appointing judges (often with approval), but judges are protected by long tenure so they can be independent.
Free elections, a free press and citizens are also checks on all three.
Parliamentary system
Voters elect members of parliament. The party or coalition with a majority forms the government; its leader becomes prime minister (in Germany, the chancellor). Ministers are usually members of parliament too, so the executive and legislature are fused.
- The government stays only while it has the confidence of parliament. A no-confidence vote can remove it without waiting for an election.
- The head of state is separate and mostly ceremonial: a monarch (UK, Japan) or an indirectly elected president (India, Germany).
- Germany uses a constructive vote of no confidence: parliament can remove the chancellor only by electing a new one at the same time, which makes governments more stable.
Strengths: laws pass easily when the government has a majority; a failing leader can be replaced quickly. Weaknesses: weaker separation of powers; coalitions can be unstable.
Presidential system
Voters elect the president and the legislature separately. The president is both head of state and head of government and chooses ministers (secretaries), who usually cannot sit in the legislature.
- Fixed terms: the legislature cannot remove the president for political reasons, only by impeachment for serious wrongdoing.
- The president cannot dissolve the legislature, but can veto its bills; the legislature can override a veto with a large majority.
- Examples: USA, Brazil, Mexico, Indonesia. South Korea combines a strong elected president with a prime minister appointed with the National Assembly's consent.
Strengths: clear separation of powers; stable term for the leader. Weaknesses: deadlock when president and legislature disagree ('divided government'); hard to remove an unpopular leader before the term ends.
Semi-presidential, monarchy and other forms
- Semi-presidential: a directly elected president shares power with a prime minister who needs parliament's support. In France the president leads foreign and defence policy. When president and parliamentary majority are from different parties it is called cohabitation. Poland is often described as a parliamentary system with an elected president who has some real powers, such as a veto.
- Super-presidential: the president has so much power that the legislature and courts check it only weakly.
- Committee (directorial) system: in Switzerland a council of seven ministers, elected by parliament, leads together; the presidency rotates every year.
- Monarchies: in an absolute monarchy the king or queen holds real power (for example Saudi Arabia). In a constitutional (parliamentary) monarchy the monarch is a symbol and an elected government rules (UK, Japan, Sweden).
- Republic: the head of state is elected, directly or indirectly, not born to the role.
Try it: the 3D and at home
In the 3D: pick Parliamentary, then Presidential. Which arrow disappears? (The confidence arrow from parliament to the leader.) Which arrows appear? (Separate elections and the veto.)
At home: read one news story about your country's government this week. Write which branch acted (made a law, carried it out, or judged it) and whether any other branch checked it.
Key formulas and definitions
- Legislature = makes laws; Executive = carries out laws; Judiciary = interprets laws
- Parliamentary: voters → parliament → prime minister (needs confidence)
- Presidential: voters → president AND voters → legislature (fixed terms)
- Semi-presidential: voters → president → appoints PM; PM needs parliament
- Checks: veto, veto override, impeachment, no-confidence vote, judicial review, budget control
Worked examples
1. In country X the prime minister lost a no-confidence vote and resigned the next day. What system is this, and why?
Parliamentary. Only in a parliamentary (or semi-presidential) system does the government depend on parliament's confidence.
2. A president refuses to sign a bill; two-thirds of the legislature then pass it again and it becomes law. Name the two checks.
The president used a veto (executive checks legislature); the legislature used a veto override (legislature checks executive).
3. A court rules that a new law breaks the constitution, so it cannot be used. Which check is this?
Judicial review: the judiciary checks the legislature (and executive).
4. Compare India and the USA: who is head of state and who is head of government?
India: President = head of state, Prime Minister = head of government (two people). USA: the President is both.
5. In France the president is from party A, but party B wins parliament. What happens?
Cohabitation: the president usually appoints a prime minister from party B, who leads domestic policy, while the president keeps a strong role in foreign and defence policy.
Common mistakes
- Thinking every president is powerful. In parliamentary systems like India or Germany the president is mostly ceremonial.
- Saying a presidential system has no checks on the president. Veto overrides, impeachment, courts and budget control all check the president.
- Mixing up head of state and head of government.
- Thinking monarchy means no democracy. Constitutional monarchies such as the UK and Japan are parliamentary democracies.