Used: Northern Ireland Assembly, in northern island and scotland local elections and in northern ireland for EU parliament
-Multimember constituencies are used. In the Norther Ireland Assembly, 18 constituencies are used and each constituency returns 6 members.
Method: Electors rank candidates in order of preference and candidates are elected if they achieve a quota of votes. The droop formula is used to calculate quota. Votes are then counted according to first preference first. If quota is achieved additiona votes are added according to second or subsequent preferences. If there still isn't a majority, the losing prty drops out and allocates all votes to other parties
Advantages: potentially highly proportional, judged on personal strengths, constituents can choose between representatives
Disadvantages: proportionality varies, single-party governemtn is unlikely, encourage competition between members of the same party
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