RCV / IRV

Ranked Choice Voting is the familiar runoff process done in a single election. Under the system, all ballots are tallied according to first-place choices. In a single-winner election, if one candidate wins a majority (50% + 1) among all first-place votes, that candidate is the winner.
 
If not, the candidate with the fewest first-place votes is eliminated and the ballots for this candidates are redistributed among the remaining candidates according to the second choices on those ballots. The process continues until one candidate has picked up a majority of votes.

Ranked Choice Voting works equally well when there are multiple seats to fill. The threshold for winning is adjusted depending on the number of seats to fill and a similar process of eliminating and electing candidates and redistributing votes occurs until all the seats are filled.
 
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