Evaluation and Selection of Strategic Suppliers Based on Sustainability Criteria in the Petrochemical Industry Using the Fuzzy CoCoSo Approach

The supplier selection process in the oil industry supply chain is consistently faced with complex decision-making challenges due to economic fluctuations, environmental requirements, and the presence of numerous qualitative and quantitative criteria. In this context, selecting strategic suppliers based on sustainability indicators (economic, social, and environmental) has become a fundamental necessity for enhancing companies' competitive capabilities. In this study, the Fuzzy CoCoSo (Combined Compromise Solution) method is employed to evaluate and select the best suppliers for Kamkaran Company (active in the fuel oil sector and affiliated with Shazand Petrochemical Company). The application of fuzzy logic in this approach enables the management of uncertainty in expert judgments and facilitates the conversion of qualitative sustainability criteria into precise mathematical data. The statistical population of the research includes supply chain experts and senior managers of Kamkaran Company and Shazand Petrochemical Company. The results of the data analysis indicate that environmental criteria (waste management and pollution reduction) and economic sustainability (financial stability and competitive pricing), with the highest weights respectively, are the most decisive factors in selecting the top supplier. Furthermore, the sensitivity analysis confirms the stability and validity of the ranking obtained through the CoCoSo model, and these findings are consistent with the macro strategies of sustainable development in the upstream oil industry.

کلیدواژه ها:

Strategic Supplier Selection ، Sustainability Criteria ، Fuzzy CoCoSo Method ، Oil and Fuel Oil Industry