Maryam Tabasi - M.Sc. Student of Industrial and Mechanical Engineering,Islamic Azad University, Qazvin branch Qazvin, Iran
Hasan Haleh - Assistant Professor of Industrial and Mechanical Engineering,Islamic Azad University, Qazvin branch,Qazvin, Iran
Ramin Mostmand - M.Sc. Student of Management, Science and Research branch,Islamic Azad University, Save branch,Save, Iran

DEA (Data Envelopment Analysis) is a model for ranking Decision Making Units, which uses some inputs and outputs.DEA establishes a best practice group among a set of observed units and identifies the units that are inefficient. If our knowledge about the inputs or outputs is not complete or accurate, it willbe better to use Grey numbers. In this paper we use Grey DEA to rank the Decision Making Units and evaluate their performances. Part 1 is introduction, part 2 is literature review, in part 3 we present the method, part 4 is numerical Example and the last part is conclusion

Performance Evaluation,DEA,Grey theory,Ranking