Fuzzy logic is often described as having four components: Fuzzification. The process of converting specific input values into some degree of membership of fuzzy sets based on how well they fit. Fuzzy rules / knowledge base. These are the If-Then rules to follow, often derived from expert opinions or via more quantitative approaches. Inference method. The way of obtaining the final fuzzy conclusion, according to the degree of membership of input variables to fuzzy sets and the detailed fuzzy rules Defuzzification. The process of converting the fuzzy conclusions into detailed output values.