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The purpose of this paper is to evaluate the efficiency of a series network system with undesirable and unreturnable simultaneously.

The research was conducted by applying data envelopment analysis (DEA) approach to measure the efficiency score of a system and substages with an undesirable output of the second and third stages separately. For each case, new production technology was introduced, and based on them, novel DEA models were proposed.

One of the most important issues in the development of a country is the banking industry. In this study, 51 branches of commercial banks as a three-stage system with undesirable and unreturnable outputs in the second stage are considered. Then, the efficiency of each branch and substages is measured by using proposed models.

The efficiency of a three-stage network in the presence of undesirable and unreturnable outputs was assessed. In this model, Kousmanen’s technology was used.

FOR TOTALLY DIFFERENT reasons, two quite different groups of experts have been forecasting dire trouble in store for British businessmen in the foreseeable future.

The advent of the M300XT Workstation makes conventional added memory boards unnecessary, but there remains a large installed base of M300 Workstations that only came with 256K. The popularity of many clone products, too, makes expansion of memory a topic that should be investigated. Specifically, the questions needing answers are: