Mixed member proportional representation, also termed mixed-member proportional voting and commonly abbreviated to MMP, is an 'additional member' voting system used to elect representatives to 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.