Aziz Naghizadeh Vardin received his BSE degree in Structural Engineering from University of Tabriz, Iran, in 1993. Now he is pursuing the Master’s degree in the field of Construction Engineering and Management in the Department of Civil Engineering, Faculty of Technical and Engineering at the Imam Khomeini International University, Iran. His research interest lies in multi-criteria decision-making methods, managerial decision-making, fuzzy set theory applications in decision-making problems, contractor selection problem and delay analysis in construction projects.