M GHADIMI - Department of mathematics, Islamic Azad University, Karaj, Iran
G.R JAHANSHAHLOO - Department of mathematics, Science & Research Branch, Islamic Azad University, Tehran, Iran
M ZOHREHBANDIAN - Department of mathematics, Islamic Azad University, Karaj, Iran
M AHADZADEH NAMIN - Department of mathematics, Science & Research Branch, Islamic Azad University, Tehran, Iran

In this paper, we develop a new point of view for sensitivity analysis and obtaining the region of efficiency of an efficient DMU. In this region changes in input and output will not alter its efficiency status. And we fiend efficient hyperplanes of PPS with this method.

DEA, VRS, Sensitivity analysis