Jaron CollisCore ConceptA non-mathematical description of uncertainty, based on what is possible, rather than probabilities derived from samples. Best used when it is impossible or impractical to accurately collect data. Example: economic theories of Keynes.BeliefBeliefConcepts expressed as degrees of belief rather than probabilities. The conceptual basis of fuzzy logic. Can be applied to decision-making: rules to reduce margin of uncertainty. falsescience12002-06-18T00:39:03.751+01:002002-08-04T17:18:11.612+01:00