通过集中开发基础，公司可以快速响应变更的业务需要和范围以及源项目，同时降低开发的总体成本。
By centralizing the development infrastructure, organizations can rapidly respond to changing business needs and scale and source projects, while lowering the total cost of development.
范围变更的影响必须被评估，包括时间、成本、质量、风险、资源和客户满意度，项目经理有足够数据做这些分析。
A change in scope MUST be evaluated for its impacts to time, cost, quality, risk, resources, and customer satisfaction. The project manager has enough data about the project to do this analysis.
这些不确定性因素会引发项目范围的变更，而项目范围的变化又会导致项目成本变动、时间进度拖延等一系列问题。
These uncertainties lead to changes to project scope, and changes in the project scope will lead to changes in project costs, schedule delays and other problems.
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