Minimum about fuzzy logic
Single valued result numeration - defuzzification

Upon evaluation of the expressions, a situation may occur when several output terms (up to four) are nonzero at the same time, so the result is rather confusing and multivalued. Therefore, it is practical to convert the combination of the term values to a single variable comprising the overall information about the resulting diagnosis, for example with the meaning risk_of_malfunction or diagnosis. This operation is an opposite problem to fuzzification, thus it is called defuzzification. The five output terms can be thereby interpreted as a group of logical functions above the output language variable diagnosis.