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Group decision-making problem is a common and crucial human activity. By the characteristic of group decision making process, the model of Multi-Attribute Group Decision Making (MAGDM) process based on evidence theory is proposed. The interacting process for MAGDM is analyzed, and the consensus analysis and the improving approach in group experts' decision making based on similarity is given. By introducing the concept of experts' relative reliability, the Dempster's rule of combination is improved, and new aggregate method for group experts' decision making. An example is presented to demonstrate the implementation of this improved method.
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