Such newer approaches as the Boehm spiral methodology and its variants are still limited in their ability to respond to changing requirements once the project has started.
一些新的途径诸如boehm螺旋方法以及它的变体，其在项目启动后响应需求变化的能力是有限的。
Barry Boehm introduced a Spiral methodology to address this problem.
Barry Boehm引入了一个螺旋型方法来解决这个问题。
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