Özet:

The importance of planning for the needs of future generations while meeting the needs of today's generations has increased even more compared to the past. In this study, it is aimed to make the supplier evaluation and selection process more suitable for current conditions by adding the sustainability topic and adhering to objective criteria. Firstly, a literature review was conducted, and the criteria for sustainable supplier selection were identified. Subsequently, decision-makers selected from the main industry company producing in the defense industry were asked to evaluate the criteria and sub-criteria determined for use in the application of this study according to their importance ratings. The weights of the criteria were determined using the Fuzzy Analytic Hierarchy Process (AHP) method. Sustainable supplier selection was made using environmental, social, quality assurance, economic, and production criteria with the inclusion of the concept of sustainable supply in the supplier selection processes. Fuzzy EDAS and Fuzzy VIKOR methods were used in alternative selection. When the results were examined, it was observed that the active suppliers with whom the company works came out on top in the rankings. This is an indicator of the consistency of decision-makers. The fact that the same alternative came out on top in both methods indicates that the methods were applied correctly. The combination of different multi-criteria decision-making methods and the large number of sub-criteria considered being sustainability-themed make this thesis study original and high-quality compared to existing studies.

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