This paper presents an interval-valued method to solve fuzzy multi-level multi-objective integer fractional programming problem (F-MMIFP). The problem under consideration involves fuzzy parameters in the objective functions, in the left-hand side and in the right-hand side of the constraints. The suggested method depends on the concept of the α-level set of the fuzzy numbers. The -MMIFP problem can be converted to interval-valued multi-level multi-objective integer fractional programming problem (IV-MMIFP), which can be transformed to interval-valued multilevel single objective integer fractional programming problem (IV-MSIFP) by using the nonnegative weighting sum approach. Then, this resulting problem can be rewritten in the form of real-valued multi-level single objective integer fractional programming problem (RV-MSIFP) using the interval-valued optimization technique together with the convex linear combination of the first and least point of the intervals in the constraints. Finally,....
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