A trapezoidal type-2 fuzzy multi-criteria decision making method based on TOPSIS for supplier selection: An application in textile sector

Supplier evaluation and selection includes both qualitative and quantitative criteria and it is considered as a complex multi criteria decision making (mcdm) problem. uncertainty and impreciseness of data is an integral part of decision making process for a real life application. the fuzzy set theory allows making decisions under uncertain environment. in this paper, a trapezoidal type 2 fuzzy multicriteria decision making methods based on topsis is proposed to select convenient supplier under vague information. the proposed method is applied to the supplier selection process of a textile firm in turkey. in addition, the same problem is solved with type 1 fuzzy topsis to confirm the findings of type 2 fuzzy topsis. a sensitivity analysis is conducted to observe how the decision changes under different scenarios. results show that the presented type 2 fuzzy topsis method is more appropriate and effective to handle the supplier selection in uncertain environment.