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Fuzzy set theory is a mathematical method that allows users to consider concepts that are subject to degree-vagueness between boundaries of full membership and nonmembership. An example might be the idea of development of a nation, the degree of constitutional control in a government, or a person's understanding of a linguistic number such as "Ba few" or "Bcertain." This entry introduces the idea of a fuzzy set as well as the operations on fuzzy sets using examples taken from the literature. It pays particular attention to challenges of interpreting and measurement of membership and between-set comparisons. It concludes with a review of selected applications of fuzzy sets in psychology, political science, and sociology.

Anthropology. --- Business and Management. --- Communication and Media Studies.