在这一步中，会开始让感兴趣的利益相关者执行一系列曾在原有系统上使用的用例。
In this step, start to engage interested stakeholders to execute a series of use cases that they are used to performing in the old system.
在方法上首先完善扩充原有系统，其次探索采用新技术逐步升级整个系统；
The means is extension to old system and then upgrading whole system with new technology.
COTS产品是指被设计成能快速安装部署、能与其它原有系统部件协调工作的部件。
COTS products are designed to be easily installed and to interoperate with existing system components.
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