en تخصصي Special پژوهشي Research <span style="font-size:11pt"><span style="line-height:normal"><span style="text-autospace:none"><span style="unicode-bidi:embed"><span calibri="" style="font-family:"><span lang="EN-US" new="" roman="" style="font-family:" times="">Many decisions are so complex that the analyst is different from the person making the final decision. Despite the wide domain of applications of multi-criteria decisions in the real world, this approach also has its limitations and challenges. It is up to the analyst to determine which method to use (to determine the weight or evaluate options) or in what situation to use only part of the method. There exist many various ranking methods for ranking efficient Decision-Making Units (DMU_S) in Data Envelopment Analysis (DEA). Nevertheless, since each of these methods considers a certain theory for ranking, they may give different ranks. In practice, select a ranking method, the results of which the Decision Maker (DM) would be able to confident is an important topic. In this paper, we consider some CCR (Charnes, Cooper and Rhodes) efficient DMU_S and then rank them by using some ranking methods, each of which is significant. Afterward, by using TOPSIS and Discriminant Analysis (DA) method, we propose the ranks of efficient DMU_S</span><span dir="RTL" lang="FA" new="" roman="" style="font-family:" times="">.</span><span lang="EN-US" style="font-family:"Times New Roman",serif"></span></span></span></span></span></span> Ranking, Efficiency Evaluation, Data Envelopment Analysis, Discriminant Analysis, TOPSIS Technique. 79 88 http://ijorlu.lahijan.iau.ir/browse.php?a_code=A-10-56-4&slc_lang=en&sid=1 S. Roushanzamir roushan_z@yahoo.com 10031947532846002589 10031947532846002589 Yes ‌‌Department of Mathematics, SR.C., Islamic Azad University, Tehran, Iran M. Rostamy Malkhlifeh rostamy@srbiau.ac.ir 10031947532846002590 10031947532846002590 No ‌‌Department of Mathematics, SR.C., Islamic Azad University, Tehran, Iran F. Hosseinzadeh Lotfi hosseinzadeh_lotf@yahoo.com 10031947532846002591 10031947532846002591 No ‌‌Department of Mathematics, SR.C., Islamic Azad University, Tehran, Iran