S. N. Hosseini Monfared - Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran.
M. R. Mozaffari - Department of Mathematics, Shiraz Branch, Islamic Azad University, Shiraz, Iran.
M. Rostamy Malkhalifeh - Department of Mathematics, Science and Research Branch, Islamic Azad University, Tehran, Iran

In this paper we propose FNDEA models based on the multiplier model under constant returns to scale (CRS) and variable returns to scale (VRS) in general two-stage network structures to classify flexible measures, in which each one of the flexible measure is treated as either input or output to maximize the overall network efficiency of the DMU under evaluation.

Data Envelopment Analysis, flexible measures, CRS and VRS assumptions, General two-stage network, Classifying