Three or four months should be enough for the project definition phase.
三到四个月对于项目定义阶段应该足够了。
They were able to use the Business Architecture to improve project life cycles which reduced requirements definition phase by 30%.
使用业务架构之后，他们极大地提升了项目的生命周期，仅需求定义阶段就的效率就提高了30%。
Since development is an iterative process, requirements definition does not end in the initial project-definition phase.
由于开发是个迭代的过程，所以需求定义并没有终止在初始的项目定义阶段。
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