Pair ranking is a voting system developed in 1987 by Nicolaus Tideman. It selects a single winner using votes that express preferences. It can also be used to create a sorted list of winners.
Problem Domain Analysis
Let’s say we need to rank four choices: A, B, C, and D. To pair-rank these choices, we list them in a column, one beneath the other:
We then ask: Which is better, A or B? We mark the choice we decide is better—say, B.
Choice B |
We then ask why B is better and record our reasoning separately. The voting yields only our preference if we don’t ...