Abstract
Many production processes yield both desirable factors(input/output) and undesirable ones. Efficiency measurment is usually based on the assumption that desirable inputs and undesirable outputs have to minimized and desirable outputs and undesirable inputs have to be maximized.So far, a number of UDEA(DEA in present undesirable factors) models have been developed: The UCCR, UBCC models and the UFDH model are well known as basic UDEA model. In this paper, we suggest a model call generalized UDEA(UGDEA)model,which can treat the above stated basic DEA models in a unified way. In addition,by establishing the theoretical properties on relationship among the UGDEA model and those UDEA models, we prove that the UGDEA model make it possible to calculate the efficiency of DMU incorporating various preference structures of decision makers.
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