M. Vaez-Ghasemi - Department of Mathematics, Rasht Branch, Islamic Azad University, Rasht, ‎Iran.
Z. Moghaddas - Department of Mathematics, Qazvin Branch, Islamic Azad University, Qazvin, ‎Iran.
B. Rahmani - Department of Mathematics, Central Tehran Branch, Islamic Azad University, Tehran, ‎Iran.‎

In this paper using DEA technique, four-stage DEA model mooted in order to consider the situation in which returned products exist. Returned products are the inputs of the previous sub-processes that need to be reprocessed due to existence of flaws. Here, a supply chain with four stages as supplier, manufacture, distributor, and retailer with intermediate and return products has been considered and a DEA model formulated for performance analysis.

Supply chain, Data Envelopment Analysis, Multi-component Decision making unit, returned products, Efficiency