Abstract: By defining formulas in a decision system, granules and granular computing are introduced. This helps to bring about a connection between the decision system and granular computing, and to obtain the condition partition which corresponds to the decision system. On the basis of granular computing, the decision system is divided into some sub-systems, each of the sub-systems is based on a block in the condition partition. A decision can be transferred from the decision system to a sub-system, which has simplified the decision process. To deal with the incomplete decision, a sub-system can be subdivided into smaller sub-systems, so that the incomplete decision is decidable in a smaller sub-system. Making a general survey of this paper, the data processing method is connected with granular computing.

Key words: decision system, granular computing, decision rule, decision

摘要： 通过定义决策系统上的公式，引出了粒和粒计算的概念，建立了决策系统与粒计算的联系，得到了决策系统的条件划分，从而以粒计算为支撑，对决策系统进行了分解，生成了若干划分子系统，促成了决策从决策系统向划分子系统的等价转换，简化了决策的过程。为处理不完备信息的决策，将划分子系统予以细分，使决策在细分子系统中得以判定。粒计算的数据处理方法寓于讨论之中。

关键词: 决策系统, 粒计算, 决策规则, 决策