CIRP Encyclopedia of Production Engineering

2019 Edition
| Editors: Sami Chatti, Luc Laperrière, Gunther Reinhart, Tullio Tolio

Fuzzy Logic

  • Alessandra CaggianoEmail author
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...

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© CIRP 2019

Authors and Affiliations

  1. 1.Department of Industrial Engineering, Fraunhofer Joint Laboratory of Excellence on Advanced Production Technology (Fh-J_LEAPT Naples)University of Naples Federico IINaplesItaly

Section editors and affiliations

  • Günther Schuh
    • 1
  1. 1.Forschungsinstitut für Rationalisierung (FIR) e. V.RWTH AachenAachenDeutschland