other Mathematical Modeling and Applications of OR Mathematical Modeling and Applications of OR پژوهشی Original <span style="font-size:10pt; font-variant:normal; white-space:pre-wrap"><span style="font-family:Calibri,sans-serif"><span style="color:#000000"><span style="font-weight:400"><span style="font-style:italic"><span style="text-decoration:none">One of the most useful tools in Operations Research (OR) which is essentially applied to evaluate the performance of treated Decision-Making Units (DMUs) is Data Envelopment Analysis (DEA). Because of in the current decades, DEA models have been used and extended in many disciplines and hence attracted much interests. The traditional DEA treats DMUs as black boxes and calculates their efficiencies by considering their initial inputs and their final outputs. Since, in the real situations, input data are included some uncertainties, hence in this study we consider a DEA with fuzzy stochastic data and suggest a three-stage DEA model by taking into account undesirable output. To achieve this aim, an extended probability approach is applied to the reform of three-stage DEA models. Finally, we give an illustrative example by considering a case study on the banking industry.</span></span></span></span></span></span> Data envelopment analysis, Network DEA, Fuzzy random variable, multi-stage methods, Undesirable output. 184 197 http://iors.ir/journal/browse.php?a_code=A-10-1422-65&slc_lang=other&sid=1 Seyed Hadi Nasseri Seyed Hadi Nasseri nasseri@umz.ac.ir 1111111111 1111111111 Yes Department of Applied Mathematics, University of Mazandaran, Babolsar, Iran Department of Applied Mathematics, University of Mazandaran, Babolsar, Iran Parastoo Niksefat Dogori Parastoo Niksefat Dogori parastooniksefat@gmail.com 1111111111 1111111111 No Department of Applied Mathematics, University of Mazandaran, Babolsar, Iran Department of Applied Mathematics, University of Mazandaran, Babolsar, Iran