LAUSR

The dynamic and variable environment of today's business has created a highly competitive atmosphere; n order for organizations to survive and succeed, they need to provide new and efficient methods in all aspects of their work. Therefore, supply chain management, as one of the effective factors in the quality of performance of the organization, has been an especial area of attention and since the quality of the final product is strongly dependent on the raw materials of the product and the efficiency of the supplier, the suppliers' proper performance will guarantee the stability of the supply chain. One of the major challenges for managers in a dynamic and uncertain environment is identifying supplier evaluation indicators, and this article tries to provide a reliable approach to this important challenge. Therefore, the main purpose of this paper is to investigate of behavioral model of suppliers of raw materials for biological products with a system dynamics approach. Accordingly, the reliability and accuracy of the proposed model has been evaluated by several statistical tests. Finally, the performance of this model is shown in the supply chain of Razi Vaccine and Serum Research Institute. The results obtained both in the tests and in the case study, all indicate the ability, reliability and high accuracy of the model in suppliers' evaluation.