当外部环境和需求发生变化时，软件代码良好的灵活性和可维护性。
Flexible and easy maintenance of software code as the environment and needs change.
从而从外部需求和内部需要两方面得出建立项目管理体系的必要性。
Thus the requirement of establishing the system of project management is important.
从而从外部需求和内部需要两方面得出建立项目管理体系的必要性。
Thus the requirement of establishing the system of project management is important.
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