Document Type : Research Paper
Department of Mathematics, Islamic Azad University, South Tehran Branch, Tehran, Iran
In the previous research, two models were suggested to evaluate the efficiency of decision-making units comprising two and three-stage network structures with desirable and undesirable intermediate measures and outputs and also the proposed models were defined with fuzzy data. In this paper, the mentioned models are improved with a multi-stage network structure. These models are then generalized to evaluate the efficiency of network decision-making units. Finally, a practical example will be presented to show the capability of the proposed model over the previous one.