First transformation: project estimation from use cases.
首个转换：来自用例的项目估计。
Each part of the software project estimation must use certain management methods. Appropriate management methods can raise the accuracy of the software project estimation.
软件项目估算的每一个部分都要用到一定的估算管理方法，良好的估算管理方法可以提高软件项目估算的准确度。
Project estimation tools provide estimates of effort and duration based on the available information.
项目估算工具根据可用信息提供工作及持续时间的估计。
Project estimation tools provide estimates of effort and duration based on the available information.
项目估算工具根据可用信息提供工作及持续时间的估计。
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