Mixed-member Proportional Representation

Mixed-member proportional representation, also termed mixed-member proportional voting and commonly abbreviated to MMP, is a voting system originally used to elect representatives to the German Bundestag, and which has now been adopted by numerous legislatures around the world. MMP is similar to other forms of proportional representation (PR) in that the overall total of party members in the elected body is intended to mirror the overall proportion of votes received; it differs by including a set of members elected by geographic constituency who are deducted from the party totals so as to maintain overall proportionality. MMP should not be confused with the additional member system used in the United Kingdom, which has no overhang seats and consequently is not completely a form of PR.

MMP is known as personalized proportional representation in Germany, where it is used on the federal level and on most state levels, the Länder. In Quebec, where an MMP model was studied in 2007, it is called the compensatory mixed-member voting system (système mixte avec compensation or SMAC).

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Voting systems
Single-winner
  • Simple majoritarianism

Read more about Mixed-member Proportional Representation:  Procedures

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