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获取需求 Requirements Sources 需求来源 Stakeholders 直接或间接影响系统需求的人或者组织 Documents 行业标准和法律文件 需求文档和遗留系统的错误报告 Systems in operation 运行中的系统，包括 遗留前任系统，以及有着竞争关系的系统（抖音） User class 用户类别 Classifying users 用户分类 直接用户、间接用户（文档、数据给另外一个机构） Disfavored User Classes 不受优待的

系统和上下文边界 Understanding where the requirements come from System Context 系统上下文 The system context is the part of the system environment that is relevant for the definition as well as the understanding of the requirements of a system to be developed. 系统上下文

需求工程的基本概念 需求的定义 A condition or capability needed by a user to solve a problem or achieve an objective. 用户解决问题或达到目标所需的条件或能力 A condition or capability that must be met or possessed by a system or system component to satisfy a contract, standard, specif