OICC Press International Journal of Mathematical Modelling & Computations 2228-6233 14 4 2024 12 21 Finding the Most Efficient Unit in Data Envelopment Analysis 381 393 10.71932/ijm.2024.1195399 EN Abbas Ghomashi Langroudi Department of mathematics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran Masomeh Abbasi Maleksari Department of Applied Mathematics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran. Saeed Shahghobadi Department of Applied Mathematics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran. Journal Article 2024 12 21 In data envelopment analysis, identifying the most efficient decision-making unit (DMU) is crucial for gaining insights into efficient DMUs. Various approaches have been suggested in the literature to determine the most efficient DMU in data envelopment analysis. These approaches aim to develop a model with enhanced discriminatory ability among DMUs. This study introduces a new model based on a common set of weights approach using mixed integer linear programming to select the most efficient DMU. The proposed model ensures that the efficiency score of only one DMU (the most efficient) is strictly greater than one, while the efficiency scores of other DMUs are less than or equal to one. This model demonstrates a strong discriminatory capability, enabling the full ranking of all DMUs with fewer constraints than models that allow complete ranking. To validate the proposed model and compare its performance with recent approaches, two numerical examples from the literature are utilized.