An Extension of Boolean Logic

Decisions of this form cannot be made easily with Boolean logic. An extension of Boolean logic, known commonly as "fuzzy logic," has been developed to deal with these situations. Such logic includes the yes/no situations for which Boolean logic is quite adequate, and extends this thinking into situations where the data are not confined to neat, yes/no information.

I believe the term "fuzzy" is unfortunate, as it implies that there is something unrigorous or even illogical about such logic. In fact, there is nothing fuzzy about fuzzy logic. It requires very careful, rigorous, and logical thinking to implement correctly When done properly, it gives exactly the same answer as Boolean logic in those situations where the required yes/no answers are available, and also gives sound answers to the many situations where the data cannot fit into yes/no categories.

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