Fuzzy sets are categories with graded membership, and constraints upon membership in a category are elastic. Instead of an object either belonging to, or not belonging to a category, the object may be more or less a member of a category. For example, a witness to a crime may make a formal statement of what they saw, and this statement may be considered more or less accurate, more or less true, relative to the statements of other witnesses. Fuzziness is often signalled in natural language by the use of hedges . Fuzziness is contrasted with crispness .
Crispness refers to precise membership within a category.
The crispness of categories we require in scientific theory, description, measurement and discourse is actually abnormal when considered either phenomenologically or cross-culturally, especially as regards religious knowledge. Indeed, that kind of crispness is rare in our own everyday lives. Well, perhaps the easiest way in is to consider the way Buddhist phenomenology handles the task. The easiest exercise to do is a modification of the sphere of sound meditation. It can be done anywhere, but is best done outside in a comfortable place where you can sit and calm out.