Then an optimization model of a single goal is set up, with the application of the gray method of prediction to predict the sales volume of the unit book number.

第二步建立一个单目标的优化模型，运用灰色预测的方法预测出单位书号的销售量。

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Then, the goal programming model is put forward to estimate the group preference. The consistency degree of single decision maker and group is defined based on result of the goal programming.

基于模型的求解结果，定义群判断一致性程度和个体一致性程度指标来度量决策者的一致性。

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