| Core Concept |
| A 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. |
| Belief |
| Concepts 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.
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