Ranked-choice voting (RCV) is a proven voting method that has been used for major elections in the U.S. and other countries for over a century. Multi-winner RCV was invented in the 1850s as a proportional representation system to be used in multi-winner elections. In the 1870s, it was adapted to the single-winner form. It is sometimes referred to as instant runoff voting, preferential voting, proportional representation, single transferable vote, and a number of other names. Download the information below in PDF format.