图1：软件开发生命周期的瀑布模型。

Figure 1: Waterfall software development lifecycle.

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然而，很多挣值管理的实现都遵循瀑布模型：需求分析、设计、开发、测试和发布。

However, many implementations of EVM follow waterfall models of requirements, design, development, test, release.

youdao

然而，很多挣值管理的实现都遵循瀑布模型：需求分析、设计、开发、测试和发布。

However, many implementations of EVM follow waterfall models of requirements, design, development, test, release.

youdao