issue 4 publication date 2013-10-01

• The Calculation of Unit's Efficiency by Using the Interval Balance Index and the Interval TOPSIS
• Estimating Returns to Scale in the Presence of Undesirable Factors in Data Envelopment Analysis
• Performance Evaluation of Sport Association Board of Isfahan Province through DEA and a Championship Approach
• Using Non-Archimedean DEA Models for Classification of DMUs: A New Algorithm
• Prioritizing Contractors Selection Using DEA-R and AHP in Iranian Oil Pipelines and Telecommunication Company
• Computation of Output Losses due to Congestion in Data Envelopment Analysis