Input and output reconsidered in supplier selection DEA model

Abstract The selection of input and output items is crucial for successful application Data Envelopment Analysis (DEA) as they should express the decision maker's preferences perceptions what might affect efficiency a making unit (DMU). This article addresses question transformation data that may be required analyses using DEA method. Different methods are available in literature, however, lead to different results, which bias decisions. paper attempts provide some guidance on this issue compare results. An example supplier evaluation will used illustrate possible solutions differences final results (supplier evaluated among efficient suppliers).