Approximate reasoning schemes involving fuzzy sets are one of the best known applications of
fuzzy logic in the wider sense. Fuzzy Inference Systems (FIS) or Fuzzy Inference Mechanisms
(FIM) have many degrees of freedom, viz., the underlying fuzzy partition of the input and output
spaces, the fuzzy logic operations employed, the fuzzification and defuzzification mechanism used,
etc. This freedom gives rise to a variety of FIS with differing capabilities
