A parliamentary system may be either
bicameral, with two
chambers of parliament (or houses) or
unicameral, with just one parliamentary chamber. A bicameral parliament usually consists of a directly elected
lower house with the power to determine the executive government, and an
upper house which may be appointed or elected through a different mechanism from the lower house. A 2019 peer-reviewed
meta-analysis based on 1,037 regressions in 46 studies finds that presidential systems generally seem to favor revenue cuts, while parliamentary systems would rely more on fiscal expansion characterized by a higher level of spending before an election.
Types Scholars of democracy such as
Arend Lijphart distinguish two types of parliamentary democracies: the Westminster and Consensus systems. Other variations exist, which scholars occasionally treat as variations of parliamentary systems, hybrids or
sui generis forms of government.
Westminster system in
London, United Kingdom. The
Westminster system originates from the
British Houses of Parliament. • The
Westminster system is usually found in the
Commonwealth of Nations and countries which were influenced by the British political tradition. These parliaments tend to have a more adversarial style of debate and the
plenary session of parliament is more important than committees. Some parliaments in this model are elected using a
plurality voting system (
first past the post), such as the United Kingdom, Canada, India and Malaysia, while others use some form of
proportional representation, such as Ireland and New Zealand. The
Australian House of Representatives is elected using
instant-runoff voting, while the
Senate is elected using proportional representation through
single transferable vote. Regardless of which system is used, the voting systems tend to allow the voter to vote for a named candidate rather than a
closed list. Most Westminster systems employ strict monism, where ministers must be members of parliament simultaneously; while some Westminster systems, such as
Bangladesh, permit the appointment of extra-parliamentary ministers, and others (such as
Jamaica) allow outsiders to be appointed to the ministry through an appointed upper house, although a majority of ministers (which, by necessity, includes the prime minister) must come from within (the lower house of) the parliament.
Consensus system in
Berlin, Germany. The Consensus system is used in most Western European countries. • The Western European parliamentary model (e.g., Spain, Germany) tends to have a more consensual debating system and usually has semi-circular debating chambers. Consensus systems have more of a tendency to use
proportional representation with
open party lists than the Westminster Model legislatures. The committees of these parliaments tend to be more important than the
plenary chamber. Most Western European countries do not employ strict monism, and allow extra-parliamentary ministers as a matter of course. The Netherlands, Slovakia and Sweden outright implement the principle of dualism, where Members of Parliament have to resign their place in Parliament upon being appointed (or elected) minister, as a form of
separation of powers.
Atypical parliamentary systems • The
semi-presidential system is the most common variant of the parliamentary system. Widely adopted after the 1950s, it is modelled after the
Fifth Republic of France. The French model (termed "premier-presidential") retains the principle that the cabinet is
de jure only politically responsible to parliament, however by also placing the president of the republic in the executive, who, unlike the prime minister, is not subject to parliamentary confidence (dual executive) it creates a hybrid of presidential and parliamentary models. Another model of semi-presidentialism is the "president-parliamentary" model, where the prime-minister and cabinet may also be dismissed be the president. Semi-presidential countries pose a challenge to political scientists as practice often differs from constitutional text. For example the French Republic is considered more presidentialized (president-parliamentary) in practice as presidents have been able to dismiss prime ministers at will. • In the
semi-parliamentary system, the legislature is split into two parts that are both directly elected , but only the power to select and remove the members of the executive by a vote of no confidence and another that does not. This exists in
Australia and
Japan. • In the (elected)
prime-ministerial system voters vote for both members of
legislature and the
prime minister. It is possible under a constitutional
monarchy, but has only existed in
republics. • A
parliamentary republic with an executive presidency is a form of parliamentary republic in which the executive derives its
democratic legitimacy from its ability to command the confidence of the
legislature to which it is held accountable, but is characterized by a combined
head of state–
head of government office in the form of an
executive president who carries out both functions.
Appointment of the head of government Implementations of the parliamentary system can also differ as to how the prime minister and government are appointed and whether the government needs the explicit approval of the parliament, rather than just the absence of its disapproval. While most parliamentary systems such as India require the prime minister and other ministers to be a member of the legislature, in other countries like Canada and the United Kingdom this only exists as a convention, some other countries including Norway, Sweden and the Benelux countries require a sitting member of the legislature to resign such positions upon being appointed to the executive. •
The head of state appoints a prime minister who will likely have majority support in parliament. While in the majority of cases prime ministers in the
Westminster system are the leaders of the largest party in parliament, technically the appointment of the prime minister is a prerogative exercised by the head of state (be it the monarch, the governor-general, or the president). This system is used in: • • • • • • • • • • •
The head of state appoints a prime minister who must gain a vote of confidence within a set time. This system is used in: • •
The head of state appoints the leader of the political party holding a plurality of seats in parliament as prime minister. For example, in Greece, if no party has a majority, the leader of the party with a plurality of seats is given an
exploratory mandate to receive the confidence of the parliament within three days. If said leader fails to obtain the confidence of parliament, then the leader of the
second-largest party is given the
exploratory mandate. If that fails, then the leader of the
third-largest political party is given the
exploratory mandate, and so on. This system is used in: • • '
The head of state nominates'' a candidate for prime minister who then tries to form a government that doesn't have a majority against them in parliament.''' In practice all leaders of political parties meets with the head of state and secretly nominates favorite candidates, and who they would reject. If one candidate fails for form a government another may be appointed, or a new election called. • • '
The head of state nominates
a candidate for prime minister who is then submitted to parliament for approval before appointment.' Example: Spain, where the King sends a proposal to the
Congress of Deputies for approval. Also, Germany where under the
German Basic Law (constitution) the
Bundestag votes on a candidate nominated by the federal president. In these cases, parliament can choose another candidate who then would be appointed by the head of state. This system is used in: • • • • '
Parliament nominates
a candidate whom the head of state is constitutionally obliged to appoint as prime minister.' Example: Japan, where the
Emperor appoints the
Prime Minister on the nomination of the
National Diet. Also Ireland, where the
President of Ireland appoints the
Taoiseach on the nomination of
Dáil Éireann. This system is used in: • • • • '
A public officeholder (other than the head of state or their representative) nominates
a candidate, who, if approved by parliament, is appointed as prime minister.' Example: Under the Swedish
Instrument of Government (1974), the power to appoint someone to form a government has been moved from the monarch to the Speaker of Parliament and the parliament itself. The speaker nominates a candidate, who is then elected to prime minister (
statsminister) by the parliament if an absolute majority of the members of parliament does not vote against the candidate (i.e. they can be elected even if more members of parliament vote
No than
Yes). This system is used in: • •
Direct election by popular vote. Example: Israel, 1996–2001, where the prime minister was elected in a general election, with no regard to political affiliation, and whose procedure can also be described as an
elected prime-ministerial system. This system was used in: • (1996–2001)
Head of state Parliamentary systems vary also vary in how the head of state is elected or selected.
Parliamentary monarchies operate under
hereditary succession. Parliamentary republics most commonly elect the head of state directly by popular vote, typically via a
two-round system, therefore a
majority or plurality principle. •
The head of state is elected directly, usually via a two-round system, rarely by
first-past-the-post voting. This system is used in: • • • • • • • • In the UK parliament, a member is free to cross over to a different party. In Canada and Australia, there are no restraints on legislators switching sides. In New Zealand,
waka-jumping legislation provides that MPs who switch parties or are expelled from their party may be expelled from Parliament at the request of their former party's leader.
Parliamentary sovereignty A few parliamentary democracies such as the
United Kingdom and
New Zealand have weak or non-existent checks on the legislative power of their Parliaments, where any newly approved Act shall take precedence over all prior Acts. All laws are equally unentrenched, wherein
judicial review may not outright annul nor amend them, as frequently occurs in other parliamentary systems like
Germany. Whilst the head of state for both nations (
Monarch, and or
Governor General) has the de jure power to withhold
assent to any bill passed by their Parliament, this check has not been exercised in Britain since the
1708 Scottish Militia Bill. Whilst both the UK and New Zealand have some Acts or parliamentary rules establishing
supermajorities or additional legislative procedures for certain legislation, such as previously with the
Fixed-term Parliaments Act 2011 (FTPA), these can be bypassed through the enactment of another that amends or ignores these supermajorities away, such as with the
Early Parliamentary General Election Act 2019 – bypassing the 2/3rd supermajority required for an early dissolution under the FTPA -, which enabled the early dissolution for the
2019 general election.
Metrics Parliamentarism metrics allow a quantitative comparison of the strength of parliamentary systems for individual countries. One parliamentarism metric is the Parliamentary Powers Index. ==Advantages==