Abstract: The requirements information of all kinds of stakeholders is acctuired and expressed using the form of viewpoint independently and dispcrscdly in Viewpoint-Oriented Requirements Engineering. It must integrate all of these viewpoints in order to yield an uniform specification. In this paper, the common development of viewpoints' specification was treated as the style of integration. The process of integration was modeled using the Category Theory. At the same time, this paper proposed two kinds of integration of viewpoints’optimizing strategics, and their validity were also proved. In addition, the relationship of the result of integration and the sequence of integration was discussed.

Key words: Requirements engineering, Vicwpoint,Integration of viewpoints,Category theory