D21 – Janeček method
From Wikipedia, the free encyclopedia
D21 – Janeček method, also known as Democracy 2.1, is an electoral system applicable for both single-winner and multi-winner voting, which allows voters to cast multiple 'plus' (positive) votes, and, in certain instances, 'minus' (negative) votes. It is similar to approval voting and combined approval voting. The method was developed by Czech mathematician Karel Janeček.
This voting method has yet to be used in any general elections. It has been used in several participatory budgeting programs conducted by cities, including New York City.[1][2]