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Network DEA, which evaluates the internal structure of decision-making units (DMUs), is instrumental in assessing operational efficiency within complex networks. Our study provides a detailed review of these methodologies and explores the concept of normalized potential improvement (NPI), specifically extending it to two-stage network production processes. We conduct a comparative analysis of both radial Farrell and non-radial NPI approaches to offer a comprehensive evaluation. To illustrate the practical application of these concepts, we assess the performance of 35 bank branches operating within two-stage structures. 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