In the present paper sensitivity analysis, or robustness, of extreme efficient DMU0 is considered. We are interested in absolute changes of inputs and outputs, where inputs are increased and outputs are decreased, of DMU0 which do not alter its efficiency status, i.e. DMU0 remains efficient. In the first part of the paper we show how to obtain equation of a hyperplane defined with m + s points obtained using method proposed by Zhu. This hyperplane, under some assumptions i.e. nondominance, serves as a boundary to the possible changes of inputs and outputs of DMU0 which leave DMU0 efficient. In the second part we introduce dual of proposed linear program for extended DEA model, and based on relationship between primal and dual program and using sensitivity analysis and parametric programming we obtain equation of the above mentioned hyperplane.
