عنوان مقاله [English]
The purchasing process is the most important activity in a supply chain. Supplier selection is the basic decision in purchasing process management. The impact of qualified suppliers on the performance of an organization is undeniably vital. These days, various approaches have been studied for selecting the best supplier as an important factor in supply chain management. This paper employs a system dynamics approach for determining the impact of supplier selection on profitability and customer satisfaction. The criterion for evaluating suppliers in the current model is based upon three factors; cost, quality and delivery time. In this model, the supplier delivers raw material with a specified quality, cost and delivery time. The level of raw material is determined according to the manufacturers orders, and based upon demand forecasts. Demands can be determined using demand forecasts from customer satisfaction and prior sales. Shipment cost is treated as a factor that will affect manufacturing cost and lead to changes in price, revenue, customer satisfaction, and producer profit. The quality of raw material is considered as a cost that is effective on the performance of the production process, and this is a factor affecting the quality of the final product and the raw material received. This factor can affect the number of defective items produced and production operation. It may lead to changes in customer satisfaction too. Delivery time from the supplier of raw material can impact customer satisfaction, due to changing customer waiting time for goods, in general. This paper is an attempt to help decision makers in using a system dynamics approach and its powerful computer simulation tool, enabling him/her to choose appropriate suppliers based upon customer satisfaction, profit levels and etc. For this purpose, the authors develop causal loop diagrams (CLD), in which dynamic relations are presented, and stock and flow diagrams (SFD) for quantitative simulation are demonstrated. The simulation results show that system dynamics can explain dynamic relationships for accessing the impact of supplier selection on profitability and customer satisfaction.