The Most Real Evaluation of Efficiency and the Causes that Produce the Inefficiency of the Decision Making Units with Two-Phase Process in DEA

DEA is a method that serves to the evaluation of the homogeneous decision making units performance that operate in similar conditions by measuring and evaluating the relative technical efficiency. To a better assessment of the magnitude of impact of the specific factors on the efficiency value serves also the examination of the process decomposes into inter-phase processes by the analysis of the efficient value, etc. The intermediate products serve as outputs for the first phase and as inputs for the second phase. The evaluation of efficiencies is done by following two different models: The independent model and the relational model. The independent model is the traditional CCR model considered separately for each phase. Considering the fact that the relational model considers the conditions as related, it is accepted as the most rational model.