Fuzzy logic is derived from fuzzy set theory dealing with reasoning that is approximate rather than precisely deduced from classical predicate logic. It can be thought of as the application side of fuzzy set theory dealing with well thought out real world expert values for a complex problem. (Klir 1997).
Degrees of truth are often confused with probabilities. However, they are conceptually distinct; fuzzy truth represents membership in vaguely defined sets, not likelihood of some event or condition. To illustrate the difference, consider this scenario: Bob is in a house with two adjacent rooms: the kitchen and the dining room. In many cases, Bob's status within the set of things "in the kitchen" is completely plain: he's either "in the kitchen" or "not in the kitchen". What about when Bob stands in the doorway? He may be considered "partially in the kitchen". Quantifying this partial state yields a fuzzy set membership. With only his little toe in the dining room, we might say Bob is 99% "in the kitchen" and 1% "in the dining room", for instance. No event (like a coin toss) will resolve Bob to being completely "in the kitchen" or "not in the kitchen", as long as he's standing in that doorway. Fuzzy sets are based on vague definitions of sets, not randomness.
Fuzzy logic allows for set membership values between and including 0 and 1, shades of gray as well as black and white, and in its linguistic form, imprecise concepts like "slightly", "quite" and "very". Specifically, it allows partial membership in a set. It is related to fuzzy sets and possibility theory. It was introduced in 1965 by Prof. Lotfi Zadeh at the University of California, Berkeley.
More on [ Fuzzy logic ]
Fuzzy Logic:: Artificial Intelligence

Fuzzy Logic - Survey of logical systems with a continuum of truth values; from the Stanford Encyclopedia by Petr Hajek .
Fuzzy Logic - Internet resources on fuzzy logic, professional organizations and networks, journals and books, research groups.
Fuzzy Logic - Open Encyclopedia article.
Meta Description: [ Science: Mathematics: Logic: Fuzzy Logic - Open Site. ]
Fuzzy Logic Archive - The Net's Original Fuzzy Logic Archive - Since 1994.
Fuzzy Logic Jump Start - Shows some examples of how this system would work. Includes instruction on method, perception, and sets. Also, gives details on how to create a logic controller as home exercise.
Meta Description: [ Free fuzzy logic tutorial. ]
Fuzzy Logic Sources - Maintained by Bob John, De Montfort University.
Fuzzy Systems by James F. Brule' - Covers the history, main concepts, applications and peer objections. Includes bibliography and additional resources.
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