Meanwhile it also studied the feasible tools and methods used in project plan and schedule control, such as SWOT analysis, SWART principle, WBS etc.

同时，对项目的计划与进度控制过程中所使用的具体方法进行了研究，诸如swot分析、SWART原则、WBS分解等。

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Also, when some requirements must be changed, this tool can provide impact analysis for the project leader. And then the leader can control the whole developing process.

并且当有需求变更时，此工具可以给项目负责人提供变更影响分析，便于负责人控制整个开发过程。

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The project and arithmetic how to control the vacuum degree are introduced by the analysis of the reason why the vacuum degree is unstable.

本文在分析电子束炉真空度不稳定原因的基础上，阐述了新的真空系统控制方案及其算法。

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