Possibility theory

Possibility theory is a framework for dealing with uncertainty, where it helps to assess how probable an event is, without requiring precise probabilities. Imagine you're considering whether it might rain tomorrow. Possibility theory allows you to express how likely that is, even if you're unsure—like saying "it's quite possible" versus "it's very unlikely." Unlike traditional probability, which needs exact values, possibility theory focuses on the range of possibilities, letting you capture and reason about uncertainty in a more flexible way. This is particularly useful in fields like artificial intelligence and decision-making.