IT2FS
IT2FS denotes Interval Type‑2 Fuzzy Systems, a specific class within the broader field of type‑2 fuzzy logic. In a conventional (type‑1) fuzzy system each membership grade is a precise value between zero and one. Type‑2 fuzzy sets extend this by assigning a secondary membership function to each primary grade, allowing the degree of membership itself to be fuzzy. In an interval type‑2 system the secondary membership functions are bounded by an interval, simplifying computation while retaining the ability to model higher‑order uncertainty.
An IT2FS typically consists of an antecedent (if–then rules), a consequent (output rule bodies), and a defuzzification
The primary advantage of IT2FS over type‑1 systems is their enhanced robustness to measurement noise and modeling
Research on IT2FS has evolved since the early 1990s, with significant contributions from researchers such as