视点合成中重叠需求的不一致优先级处理

对多视点方法来说，各视点不同的利益观可能导致视点之间的重叠需求相对于不同视点优先级设定方面的不一致性．该文主要讨论了视点合成中重叠需求不一致优先级的处理策略和方法．首先作者对需求优先级以及重叠需求相对于不同视点优先级的不一致性等概念给出了严格的定义．其次，对于IEEE推荐标准，作者分别采用格和乘积格来表示重叠需求相对于各视点和合成视点的优先级，借助于乘积格的准布尔特性实现对不一致优先级的容忍策略；最后对基于精确度量设定优先级的情形，采用平均策略确定重叠需求相对于合成视点的综合度量，重新设定重叠需求相对于合成视点的优先级，从而解决这种不一致性．

Handling Inconsistent Priorities of Overlapped Requirements in Merging Viewpoints

In the framework of viewpoints, the differences between the assessments on requirement benefit and risk in different viewpoints could cause inconsistency in prioritizing overlapped requirements. In this paper, we present a strategy of handing the inconsistent priorities in different individual viewpoints. We firstly define the priority of requirement and the inconsistency in prioritizing overlapped requirements. Then, the three-valued lattice and corresponding quasi-Boolean product lattice are adopted to represent the priority of overlapped requirements relative to the individual viewpoint and the combined viewpoint respectively for IEEE recommended standard about prioritizing requirements. By using this strategy, the inconsistency may be tolerated in some sense in merging viewpoints. Finally, for the case that the quantitative measurement can be given for the prioritizing requirements, we propose an average strategy to determine the combined measurement of overlapped requirement. And then the overlapped requirements can be re-prioritized based on their combined measures. Consequently, the inconsistency is resolved.