CIRP Encyclopedia of Production Engineering

2014 Edition
| Editors: The International Academy for Production Engineering, Luc Laperrière, Gunther Reinhart

Fuzzy Logic

  • Alessandra Caggiano
Reference work entry


The term fuzzy logic has two different meanings. More specifically, in a narrow sense, fuzzy logic, FLn, is a logical system which may be viewed as an extension and generalization of classical multivalued logics. But in a wider sense, fuzzy logic, FLw, is almost synonymous with the theory of fuzzy sets (Zadeh 1975).

Extended Definition

Basically, fuzzy logic (FL) is a multivalued logic, which allows intermediate values to be defined between conventional evaluations like true/false, yes/no, and high/low. Fuzzy logic is an extension of the traditional logic to intermediate and approximate values.

Theory and Application


The concept of fuzzy logic emerged in 1965 within the development of the theory of fuzzy sets by Lotfi A. Zadeh, professor of computer science at the University of California in Berkeley (Zadeh 1965).

Later, in 1972, Michio Sugeno of the Tokyo Institute of Technology introduced the concepts of fuzzy measure and fuzzy integral. One of the first...

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Copyright information

© CIRP 2014

Authors and Affiliations

  1. 1.Fraunhofer Joint Laboratory of Excellence on Advanced Production Technology, Department of Chemical, Materials and Production EngineeringUniversity of Naples Federico IINaplesItaly