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A parliamentary system, also known as parliamentarianism (and parliamentarism in U.S. English), is distinguished by the executive branch of government being dependent on the direct or indirect support of the parliament, often expressed through a vote of confidence. Hence, there is no clear-cut separation of powers between the executive and legislative branches, leading to a differing set of checks and balances compared to those found in a presidential republic. Parliamentary systems usually have a clear differentiation between the head of government and the head of state, with the head of government being the prime minister or premier, and the head of state often being an elected (either popularly or through parliament) president or hereditary monarch. Though in Parliamentary systems the prime minister and cabinet will exercise executive power on a day-to-day basis, actual authority will usually be bestowed in the head of state, giving them many codified or uncodified reserve powers, providing some balance to these systems.

The term parliamentary system does not mean that a country is ruled by different parties in coalition with each other. Such multi-party arrangements are usually the product of an electoral system known as proportional representation. Parliamentary countries that use first past the post voting usually have governments composed of one party. However, parliamentary systems in continental Europe do use proportional representation, and tend to produce election results in which no single party has a majority of seats.

Parliamentarianism may also be heeded for governance in local governments. An example is the city of Oslo, which has an executive council as a part of the parliamentary system. The council-manager system of municipal government used in some U.S. cities bears many similarities to a parliamentary system.

Types

There are broadly two forms of Parliamentary Democracies.

• Westminster System or Westminster Models tend to be found in Commonwealth of Nations countries, although they are not universal within nor exclusive to Commonwealth countries. These parliaments tend to have a more adversarial style of debate and the plenary session of parliament is relatively more important than committees. Some parliaments in this model are elected using "First Past the Post" electoral systems, (e.g. Canada, India and the UK), others using proportional representation, e.g. Ireland and New Zealand. The Australian House of Representatives is elected using the alternative or preferential vote while the Senate is elected using PRSTV (proportional representation through the single transferable vote). However even when proportional representation systems are used, the systems used tend to allow the voter to vote for a named candidate rather than a party list. This model does allow for a greater separation of powers than the Western European Model, although the extent of the separation of powers is nowhere near that of the presidential system of United States.
• Western European Parliamentary Model (e.g. Spain, Germany) tend to have a more consensual debating system, and have semi-cyclical debating chambers. Proportional representation systems are used, where there is more of a tendency to use party list systems than the Westminster Model legislatures. The committees of these Parliaments tend to be more important than the plenary chamber. This model is sometimes called the West German Model since its earliest exemplar in its final form was in the Bundestag of West Germany (which became the Bundestag of Germany upon the absorption of the GDR by the FRG).

There also exists a Hybrid Model, the semi-presidential system, drawing on both presidential systems and parliamentary systems, for example the French Fifth Republic. Much of Eastern Europe has adopted this model since the early 1990s.

Advantages of a parliamentary system

Some believe that it's easier to pass legislation within a parliamentary system. This is because the executive branch is dependent upon the direct or indirect support of the legislative branch and often includes members of the legislature. In a presidential system, the executive is often chosen independently from the legislature. If the executive and legislature in such a system include members entirely or predominantly from different political parties, then stalemate can occur. Former US President Bill Clinton often faced problems in this regard, since the Republicans controlled Congress for much of his tenure. That being said, presidents can also face problems from their own parties, as former US President Jimmy Carter often did .

In addition to quicker legislative action, Parliamentarianism has attractive features for nations that are ethnically, racially, or ideologically divided. In a unipersonal presidential system, all executive power is concentrated in the president. In a parliamentary system, with a collegial executive, power is more divided. In the 1989 Lebanese Taif Agreement, in order to give Muslims greater political power, Lebanon moved from a semi-presidential system with a strong president to a system more structurally similar to a classical parliamentarianism. Iraq similarly disdained a presidential system out of fears that such a system would be equivalent to Shiite domination; Afghanistan's minorities refused to go along with a presidency as strong as the Pashtuns desired.

It can also be argued that power is more evenly spread out in the power structure of parliamentarianism. The premier seldom tends to have as high importance as a ruling president, and there tends to be a higher focus on voting for a party and its political ideas than voting for an actual person.

In The English Constitution, Walter Bagehot praised parliamentarianism for producing serious debates, for allowing the change in power without an election, and for allowing elections at any time. Bagehot considered the four-year election rule of the United States to be unnatural.

There is also a body of scholarship, associated with Juan Linz, Fred Riggs, Bruce Ackerman, and Robert Dahl that claims that parliamentarianism is less prone to authoritarian collapse. These scholars point out that since World War II, two-thirds of Third World countries establishing parliamentary governments successfully transitioned to democracy. By contrast, no Third World presidential system successfully transitioned to democracy without experiencing coups and other constitutional breakdowns. As Bruce Ackerman says of the 30 countries to have experimented with American checks and balances, “All of them, without exception, have succumbed to the nightmare [of breakdown] one time or another, often repeatedly.?

A recent World Bank study found that parliamentary systems are associated with lower corruption. ^[1]

Criticisms of parliamentarianism

One main criticism of many parliamentary systems is that the head of government is in almost all cases not directly elected. In a presidential system, the president is usually chosen directly by the electorate, or by a set of electors directly chosen by the people, separate from the legislature. However, in a parliamentary system the prime minister is elected by the legislature, often under the strong influence of the party leadership. Thus, a party's candidate for the head of government is usually known before the election, possibly making the election as much about the person as the party behind him or her.

Another major criticism of the parliamentary system lies precisely in its purported advantage: that there is no truly independent body to oppose and veto legislation passed by the parliament, and therefore no substantial check on legislative power. Conversely, because of the lack of inherent separation of powers, some believe that a parliamentary system can place too much power in the executive entity, leading to the feeling that the legislature or judiciary have little scope to administer checks or balances on the executive. However, most parliamentary systems are bicameral, with an upper house designed to check the power of the lower (from which the executive comes).

Although it is possible to have a powerful prime minister, as Britain has, or even a dominant party system, as Japan has, parliamentary systems are also sometimes unstable. Critics point to Israel, Italy, India, the French Fourth Republic, and Weimar Germany as examples of parliamentary systems where unstable coalitions, demanding minority parties, votes of no confidence, and threats of such votes, make or have made effective governance impossible. Defenders of parliamentarianism say that parliamentary instability is the result of proportional representation, political culture, and highly polarised electorates.

Although Walter Bagehot praised parliamentarianism for allowing an election to take place at any time, the lack of a definite election calendar can be abused. In some systems, such as the British, a ruling party can schedule elections when it feels that it is likely to do well, and so avoid elections at times of unpopularity. Thus, by wise timing of elections, in a parliamentary system a party can extend its rule for longer than is feasible in a functioning presidential system. In other systems, such as the Dutch and the Belgian, the ruling party or coalition has some flexibility in determining the election date.

Alexander Hamilton argued for elections at set intervals as a means of insulating the government from the transient passions of the people, and thereby giving reason the advantage over passion in the accountability of the government to the people.

Parliamentarism and party formation

Parties in parliamentary systems have had much tighter ideological cohesiveness than parties in presidential systems. It would be difficult for a parliamentary system to have a party like the United States Democratic Party, which until the 1980s was a coalition of Southern conservative Protestants ('Dixiecrats') and urban liberals with no single unified ideology. In a parliamentary system, a party such as this would typically splinter because, if in government, it may be unable to govern effectively. Having splintered, though, the resulting parties might join in a governing coalition.

This form of government is often compared to a Presidential system.

Countries with a parliamentary system of government

Unicameral system

This table shows countries with parliament consisting of a single house.

Country	Parliament
Albania	Kuvendi
Bangladesh	Jatiyo Sangshad
Bulgaria	National Assembly
Burkina Faso	National Assembly
Croatia	Sabor
Denmark	Folketing
Dominica	House of Assembly
Estonia	Riigikogu
Finland	Eduskunta
Greece	Hellenic Parliament
Hungary	National Assembly
Iceland	Althing
Israel	Knesset
Kurdistan Region	Kurdistan National Assembly
Latvia	Saeima
Lithuania	Seimas
Malta	House of Representatives
Moldova	Parliament
Mongolia	State Great Khural
Montenegro	Parliament
New Zealand	Parliament
Norway*	Storting
Palestinian Authority	Parliament
Papua New Guinea	National Parliament
Portugal	Assembly of the Republic
Saint Kitts and Nevis	National Assembly
Saint Vincent and the Grenadines	House of Assembly
Samoa	Fono
Serbia	National Assembly
Singapore	Parliament
Slovakia	National Council
Sweden	Riksdag
Turkey	Grand National Assembly
Ukraine	Verhovna Rada
Vanuatu	Parliament

• The Norwegian Parliament is divided in the Lagting and Odelsting in legislative matters. This separation will be abolished with the next parliament in 2009 due to a constitutional amendment.

Bicameral system

This table shows countries with parliament consisting of two houses.

Country	Parliament	Upper chamber	Lower chamber
Australia	Parliament	Senate	House of Representatives
Austria	Parliament	Federal Council	National Council
Antigua and Barbuda	Parliament	Senate	House of Representatives
The Bahamas	Parliament	Senate	House of Assembly
Barbados	Parliament	Senate	House of Assmebly
Belize	National Assembly	Senate	House of Representatives
Belgium	Federal Parliament	Senate	Chamber of Representatives
Bhutan	Parliament (Chitshog). Bhutan will become a Democratic Constitutional Monarchy in 2008	National Council (Gyalyong Tshogde)	National Assembly (Gyalyong Tshogdu)
Canada	Parliament	Senate	House of Commons
Czech Republic	Parliament	Senate	Chamber of Deputies
Ethiopia	Federal Parliamentary Assembly	House of Federation	House of People's Representatives
Germany		Bundesrat (Federal Council)	Bundestag (Federal Diet)
Grenada	Parliament	Senate	House of Representatives
India	Parliament	Rajya Sabha (Council of States)	Lok Sabha (House of People)
Ireland	Oireachtas	Seanad Éireann	Dáil Éireann
Iraq	National Assembly	Council of Union [2]	Council of Representatives
Italy	Parliament	Senate of the Republic	Chamber of Deputies
Jamaica	Parliament	Senate	House of Representatives
Japan	Diet	House of Councillors	House of Representatives
Malaysia	Parliament	Dewan Negara	Dewan Rakyat
The Netherlands	States-General	Eerste Kamer	Tweede Kamer
Pakistan	Majlis-e-Shoora	Senate	National Assembly
Poland	Parliament	Senate	Sejm
Romania	Parliament	Senate	Chamber of Deputies
Saint Lucia	Parliament	Senate	House of Assembly
Slovenia	Parliament	National Council	National Assembly
South Africa	Parliament	National Council of Provinces	National Assembly
Spain	Cortes Generales	Senate	Congress of Deputies
Switzerland	Federal Assembly	Council of States	National Council
Thailand	National Assembly [3]	Senate	House of Representatives
Trinidad and Tobago	Parliament	Senate	House of Representatives
United Kingdom	Parliament	House of Lords	House of Commons

Notes