Data envelopment analysis (DEA) has been proven as an excellent data-oriented efficiency analysis method when there are multiple inputs and outputs in a set of decision making units (DMUs). In conventional DEA we assume that the produced outputs are perfect and they are considered as final outputs. However, in real applications, there are systems in which their produced outputs are possibly imperfect and defective. These outputs enter the system as inputs once again and after rebuilding, they will be completed. The present paper proposes a modification on the standard DEA model to incorporate such an imperfect outputs. Numerical example is used to demonstrate the approach.

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