三到四个月对于项目定义阶段应该足够了。
Three or four months should be enough for the 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。
Since development is an iterative process, requirements definition does not end in the initial project-definition phase.
在项目定义阶段，设计阶段，和结果测试阶段，用户的参与是很重要的。
It is important to involve the users in the definition phase, design phase and in the testing of the project result.
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