在1985年，几乎所有明确定义了软件开发生命周期(SDLC)的项目都采用了瀑布模型，如图1所示。

In 1985, almost all projects with a well-defined Software Development Lifecycle (SDLC) used the waterfall model, shown in Figure 1.

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他的工作解释了如何开发增量的系统、按照风险排列优先级、以及反对使用传统的序列的瀑布模型。

This work explained how to develop systems in small increments, prioritized according to risk, as opposed to using the more traditional sequential, single-pass, waterfall model.

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那意味着您在前面做完了所有的需求，正如瀑布模型。

That means you've done all of your requirements up front, just like in a waterfall model.

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