Guides

Get your group started, or take a closer look at the rules.

Approval vs. ranked-choice voting

Compare approval voting with instant runoff: the ballots, how backup choices count, and why the same group can choose different winners.

The winner’s curse in auctions

What is the winner’s curse? Learn why overestimating an item’s value can make you more likely to win an auction and more likely to overpay.

Looking for a particular method?

Explore the rules and examples for each auction format or voting system.