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In today's competitive environment, industries are more vulnerable to economic changes. To help them keep better quality, higher productivity and low costs, it is necessary to have a right strategy. Therefore, the goal of this paper is to introduce outsourcing strategy as a tool for enhancing the organisational productivity by selecting the best supplier. Consequently, first, 30 suppliers that provide services/goods to Iran's Railway were selected and the amount of products/services provided by each supplier were determined in respect to the goals set by the company. Then the most important criteria were determined for the evaluation of the suppliers of Iran's railway. Following, the suppliers' efficiency degree was determined using DEA method. Finally, the suppliers were ranked through crossing efficiency matrix. The results indicate that the supplier 25 is the most efficient followed by the suppliers 2 and 4 respectively.