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Application of Interval Type-2 Fuzzy Topsis Method in Contractor Evaluation Process: A Case Study in Small and Medium Enterprises (SMEs)
This study aims to develop a Multi-Criteria Decision Making (MCDM) framework to help select the most appropriate contractors in Small and Medium Sized Enterprises (SMEs). The proposed framework uses a combination of the TOPSIS method and the fuzzy logic theory and consists of three steps. First, a detailed literature review of contractor selection and tender evaluation is conducted to determine and finalize evaluation criteria. Then, interval type-2 fuzzy sets and linguistic variables are used to handle the uncertainties, and the weights of the evaluation criteria are obtained by the decision makers based on linguistic terms that are converted to interval type-2 fuzzy numbers. Finally, the interval type-2 fuzzy TOPSIS method is used to rank contractor alternatives for SMEs. In addition, an example of an SME inspired by the contractor selection process in the case study organizations in Turkey has been used to demonstrate the effectiveness of the proposed approach.

Interval type-2 fuzzy numbers, Topsis, contractor selection, small and medium enterprises.

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