Figure 2: Spiral model of the software development lifecycle

图 2：软件开发生命周期的螺旋模型

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The crucial stage of development in which you can change the direction of the spiral turned out to be surprisingly early on.

研究发现，能使螺旋方向改变的关键阶段早的令人惊讶。

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The following graph demonstrates the current development environment, using any of the Waterfall, Spiral or Iterative processes.

下面的图片使用瀑布式方法、螺旋型方法或迭代过程中的任何一种方法来描述当前开发环境。

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Management ran a fairly loose ship, letting costs spiral out of control on a number of development projects.

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