According to Bart Kosko, the fuzzy approximation (FAT) indicates that a fuzzy system may mimic any continuous system. Each rule functions as a fuzzy patch that the system applies to the response in order to make it look like the response of the continuous system. While Fuzzy Approximate Reasoning refers to the method used to derive a probable imprecise conclusion from a set of imprecise premises. In approximate reasoning, fuzzy logic is capable of dealing with many sorts of uncertainty.