Block preferential voting

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Multiple transferable voting, sometimes called block preferential or block instant-runoff voting, is a winner-take-all system for electing several representatives from a multimember constituency. Unlike single transferable voting (STV), preferential block voting is not a method for obtaining proportional representation, and instead produces similar results to plurality block voting. Preferential block voting can be seen as a multiple-winner version of instant-runoff.

Under both block voting and preferential block voting, a single group of like-minded voters can win every seat, making both forms non-proportional.