6. Conclusions
In this study, the paper proposes the extended VIKOR based on cloud modelfor supplier selection in nuclear power industry, which is the first work attempted to use this technique for supplier selection. The extended VIKOR can rank and select the best one from a set of alternatives. The cloud variable is used to define criteria, sub criteria and their uncertain weights, which can handle well imprecise information. The extended method is based on the aggregating cloud merit Q j representing the distance of an alternative to the ideal solution. When applied to a case from China,the extended method shows excellent suitability. The DMs can well understand the decisionmaking process and results through the linguistic (cloud) data. Finally, the best supplier received recognition from DMs. In conclusion, this proposed extended method can be utilized to solve the comprehensive and multi-constrained optimal selection problem with clear and effective management process. For the industry which needs to focus on some specific criteria, the two-phase extended method will show good practicability and advantage. In the practical management problems, the managers should pay more attention to the suitability of the methods and the efficiency of management process.