User stories and use cases help focus any development project on those who stand to benefit, i.e. the project’s stakeholders, and can guard simultaneously against insufficient planning and software bloat. And the concepts, though most often thought of with respect to large-scale projects, apply in all circumstances, from the smallest feature request to an existing system to the redesign of a complex system.

中文翻译：

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谁会使用它，为什么？用户故事和用例

用户故事和用例可帮助将任何开发项目的重点放在受益的人（即项目的利益相关者）上，并且可以同时防止计划不足和软件膨胀。尽管从规模最小的功能需求到现有系统再到复杂系统的重新设计，这些概念尽管在大型项目中最常被想到，但它们适用于所有情况。