Presenting a Model for Evaluation and Selection of Sustainable Third Party Logistics Service Providers in the supply chain Based on the Combined Approach of Fuzzy Analytical Hierarchy and Cocoso Technique (case study: dairy industry)

In today's world, industries face great pressure to integrate sustainability issues for efficient and successful supply chain management. Choosing the most suitable supply chain logistics service provider is a critical strategic decision for businesses aiming to achieve an effective and sustainable supply chain. In the present research, in the first stage, by studying and reviewing previous researches, the effective indicators in the selection of sustainable third-party logistics service providers were determined, and by using the fuzzy Delphi method, the indicators were screened based on the opinions of dairy industry experts, and with the help of the , fuzzy analytical hierarchy process approach. The weight of each index was determined. In the following, the Cocoso technique was used to evaluate third-party logistics service providers. Among the 16 sustainability indicators based on the opinions of dairy industry experts, the indicators of on-time delivery and transportation cost have the highest weight. The evaluation results of the third-party logistics service providers showed that Company No. 3 had a better sustainable performance than other companies. According to the obtained results, on-time delivery and transportation cost can be considered as the main reasons driving dairy companies to cooperate with third-party logistics companies.