The London School of Economics reports:

22 voting theory specialists voted to select the “best voting procedure” to elect one out of three or more candidates.

Each voter chose from a list of 18 nominated voting procedures as many as she/he approved of. From a possible maximum of 22 votes, First Past The Post (FPTP)­ –­ also known as Plurality Voting – received no votes. Approval Voting won the contest with 15 votes. The Alternative Vote (AV) took second place with 10 votes.