In today's competitive market, manufacturers not only intend to improve internal conditions,\nbut choosing the best of markets and suppliers is at the top of their agenda. Selecting the best\nalternatives in each of these decisions requires analysis of many factors, which as a result,\nencounters organizations with a problem of multi-criteria decisions. On the other hand, the\napplication of the grey relational analysis (GRA) in connection with consideration of the\ncriteria in different managerial and operational issues has been referred to in many articles\nalong which goal programming may consider several goals according to the priorities of the\ndecision maker. The combination of these two techniques may create a model that takes into\nconsideration various goals through simultaneous consideration of varied criteria.\nIn this article, a model of decision making is presented, which evaluates potential suppliers\nwith the help of combination of the grey theory system and goal programming and\nconsideration of various constraints, and ultimately, the best options are selected and the\npurchasing plan from each in every period is determined as well. For the purpose of\nexamination, the model�s reliability has been evaluated by case basis in a big automotive\nmanufacturing plant, and senior managers have approved the results.
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