An extension of two-valued Logic such that statements need not be True or False, but may have a degree of truth between 0 and 1. Such a system can be extremely useful in designing control logic for real-world systems such as elevators.

**References**

McNeill, D. and Freiberger, P. *Fuzzy Logic: The Discovery of a Revolutionary Computer Technology and How It is Changing Our World.*
Nguyen, H. T. and Walker, E. A. *A First Course in Fuzzy Logic.* Boca Raton, FL: CRC Press, 1996.

Yager, R. R. and Zadeh, L. A. (Eds.) *An Introduction to Fuzzy Logic Applications in Intelligent Systems.*
Boston, MA: Kluwer, 1992.

Zadeh, L. and Kacprzyk, J. (Eds.). *Fuzzy Logic for the Management of Uncertainty.* New York: Wiley, 1992.

© 1996-9

1999-05-26