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Due to the increased environmental concern and also attain competitive advantages, closed-loop supply chain network design has spurred an interest throughout the two last decades among researchers. In addition, supplier selection and considering importance value of customers are of basis issues, which strongly affect on the supply chain performance. In this study, we propose a closed-loop supply chain network that incorporates the network design decisions in both forward and reverse supply chain networks as well as assimilates strategic and tactical decisions. The network is considered for the production of one product through an assembly of multi modules supplied by different suppliers and usage rate. To solve the proposed model, we use STEP method as an interactive approach which reveals the effect on the network solution due to changes in DM's preferences on various objectives.