A requirement is simply a statement of what the system must do or what characteristics it needs to have. Requirements evolve from broad statements of overall （71）from the system to detailed statements of the business capabilities that a system should support to detailed technical statements of the way in which the capabilities will be implemented in the new system. （72）focus on describing how to create the software product that will be produced from the project. Nonfunctional requirements are primarily used in the design phase when decisions are made about the user interface, the hardware and software, and the system's underlying architecture. The system's physical and technical environments would be considered （73）. The speed, capacity, and reliability of the system belong to （74）.（75）describes that who has authorized access to the system under what circumstances.
（75）应选？

System constraint

Cultural requirement

Control requirement

Security requirement

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答案：

解析：

需求只是陈述了系统必须做什么或者系统需要有什么特性，需求来自于从系统总体（71）的广泛陈述到系统所支持业务能力的详细陈述，再到新系统能力实现中所采用方法的详细技术陈述。（72）致力于描述如何创建将在项目中产生的软件产品。非功能性需求主要在设计阶段中做出关于用户界面、硬件和软件，以及系统底层架构的决策时使用。系统的物理和技术环境将被看作一种（73）。系统的速度、能力和可靠性属于（74）。（75）描述了谁在什么情况下具有访问系统的权限。