Preferential block voting, is a majoritarian voting system for electing several representatives from a single multimember constituency. Unlike the single transferable vote (STV), preferential block voting is not a method for obtaining proportional representation, and instead produces similar results to plurality block voting (a type of multiple non-transferable vote, MNTV), of which it can be seen as the instant-runoff version, making it a multiple transferable vote (MTV). Under both systems, a single group of like-minded voters can win every seat, making both forms of block voting non-proportional.