Fuzzy Logic

Fuzzy logic [30] is an alternative approach to control system design. Fuzzy logic works within the framework of set theory and is better at dealing with ambiguities. For example, three sets might be defined for a sensor: hard failure, soft failure, and no failure. The three sets might overlap, and at any given time, the sensor may have a degree of membership in each set. In effect, you would be applying a degree of fuzziness.