List of Articles Open Access Article Abstract Page Full-Text 1 - Determination of right/left return to scale in two-stage processes based on dual simplex Sara Fanati Rashiddi Open Access Article Abstract Page Full-Text 2 - Assessing the undesirable cost imposed on the system with fuzzy DEA Jafar Pourmahmoud Naser Bafekr Sharak Open Access Article Abstract Page Full-Text 3 - Allocating Fixed Costs: A Goal Programming Model Based on Data Envelopment Analysis Sedighe Asghariniya Saeid Mehrabian Hamed Zhiani Rezai Open Access Article Abstract Page Full-Text 4 - Target setting in the process of merging and restructuring of decision-making units using multiple objective linear programming Javad Gerami Open Access Article Abstract Page Full-Text 5 - The overall efficiency and projection point in network DEA Zeinab Aghababazadeh Shima Aghababazadeh Open Access Article Abstract Page Full-Text 6 - Efficiency evaluating and improvement by using the network SBM-DEA model with undesirable output: A case study of Iranian airlines Fatemeh Shirazi Emran Mohammadi