The European Parliament during a plenary session in 2014.
The British Houses of Parliament are situated within the Palace of Westminster, in London
Constitution of the Year XII (First French Republic)
Canadian Parliament at night
Constitution of the Kingdom of Naples in 1848.
The Sansad Bhavan (Parliament House) building in New Delhi, India
Detail from Hammurabi's stele shows him receiving the laws of Babylon from the seated sun deity.
Knesset Building, Jerusalem
Diagram illustrating the classification of constitutions by Aristotle.
The Australian Senate
Third volume of the compilation of Catalan Constitutions of 1585
The Cossack Constitution of Pylyp Orlyk, 1710.
A painting depicting George Washington at the Constitutional Convention of 1787 signing of the U.S. Constitution
Constitution of May 3, 1791 (painting by Jan Matejko, 1891). Polish King Stanisław August (left, in regal ermine-trimmed cloak), enters St. John's Cathedral, where Sejm deputies will swear to uphold the new Constitution; in background, Warsaw's Royal Castle, where the Constitution has just been adopted.
Presidential copy of the Russian Constitution.
Magna Carta
United States Constitution

The Westminster system or Westminster model is a type of parliamentary government that incorporates a series of procedures for operating a legislature.

- Westminster system

Unlike the uncodified British constitution, most countries that use the Westminster system have codified the system, at least in part, in a written constitution.

- Westminster system

The Westminster parliamentary procedures are followed in several Commonwealth countries, including the United Kingdom, Canada, Australia, New Zealand, India, and South Africa.

- Parliamentary procedure

Parliamentary procedure also allows for rules in regards to nomination, voting, debate, disciplinary action, appeals, and the drafting of organization charters, constitutions, and bylaws.

- Parliamentary procedure

The second would include such elements as the making of decisions by public conventions called by public notice and conducted by established rules of procedure.

- Constitution

Uncodified constitutions are the product of an "evolution" of laws and conventions over centuries (such as in the Westminster System that developed in Britain).

- Constitution
The European Parliament during a plenary session in 2014.

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Palace of Westminster in February 2007


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Assembly with the authority to make laws for a political entity such as a country or city.

Assembly with the authority to make laws for a political entity such as a country or city.

Palace of Westminster in February 2007
Map showing the terminology for each country's national legislature
The Congress of the Republic of Peru, the country's national legislature, meets in the Legislative Palace in 2010
The British House of Commons, its lower house
The German Bundestag, its theoretical lower house
The Australian Senate, its upper house

In Westminster-style legislatures the executive (composed of the cabinet) can essentially pass any laws it wants, as it usually has a majority of legislators behind it, kept in check by the party whip, while committee-based legislatures in continental Europe and those in presidential systems of the Americas have more independence in drafting and amending bills.

Each chamber of the legislature consists of a number of legislators who use some form of parliamentary procedure to debate political issues and vote on proposed legislation.

Some political systems follow the principle of legislative supremacy, which holds that the legislature is the supreme branch of government and cannot be bound by other institutions, such as the judicial branch or a written constitution.