Toolbox for Interval Type-2 Fuzzy Logic Systems Type-2 systems has been becoming the focus of research in the field of fuzzy logic in recent years Comparing with type-1 systems, type-2 fuzzy systems are more complex and relatively more difficult to understand and implement-Toolbox for Interval Type-2 Fuzzy Logic Systems　Type-2 systems has been becoming the focus of research in the field of fuzzy logic in recent years Comparing with type-1 systems, type-2 fuzzy systems are more complex and relatively more difficult to understand and implement