Let’s say you have to organise a group dinner. With so many preferences, dietary restrictions and non-specifically fussy eaters, what is the best method to decide where to eat without starving to death while deciding?
The classic method relies on old-fashioned democracy, where people vote on their most desired place. However, the smaller the group size, the less reliable this method becomes as the results become more split. Furthermore, this method can make the minority unhappy as the majority choice may not even be the minority’s second or third choice. Lastly, it runs the risk of the “wolf and sheep” problem, where two wolves vote to eat the sheep and the sheep has no say because it is the minority.
A much better method is the approval voting system. Here, all you have to ask is for everyone to vote on every place that they are okay with going to. For example, let us say that 6 people have to vote between three potential options: burgers, dumplings and fried chicken.
In the old system, it could have been that 2 people voted on each option, making the vote useless. Or, 3 people may have voted dumplings when the other 3 hate it (but voted 2 burgers, 1 chicken), meaning half the group is unhappy with the final result.
With the new system, 3 people are okay with burgers, 3 people are okay with dumplings and 5 people are okay with fried chicken. Fried chicken wins the vote and a much greater majority of the participants are okay with the result, because the vote reflects some of their preference, even if it wasn’t what they most wanted.
The approval voting system also has the strength of accounting for people who are indecisive and vote on everything, or nothing. Voting on all the options essentially cancels out the ratio, so it counts as a null vote. This means that people have less power to swing the votes one way or another.
All in all, it is a simple but powerful tool to help decision-making in a group setting, which can be painfully frustrating when you are just trying to have fun together and relax.