MTBF quite commonly appears as a non-functional requirement.
MTBF 通常作为非功能需求出现。
For instance, consider a non-functional requirement that specifies some set of platforms to be supported.
例如，考虑一个指定某个需要支持的平台组合的非功能需求。
Constraints should be treated as separate from other requirement types in the same way as any other form of non-functional requirement. For example.
约束应当被从其他需求类型中分离出来，同其他类型的非功能需求一样被来区别对待。
The non-functional requirement of the system, such as performance scalability, interoperability can be used to determine which patterns are to be used.
系统的非功能需求(如性能可伸缩性、互操作性)可以用于确定要使用哪个模式。
A Rational RequisitePro requirement management file, for the non-functional requirements for the inventory use case, is available as a Reusable asset Specification (RAS) asset.
对于库存系统用例的非功能需求，RationalRequisitePro需求管理文件是以可重用资产规范(ReusableAsset Specification, RAS)资产的形式提供的。
Each project brings its functional and non functional requirement, constraints and changes.
每个项目都有其功能性和非功能性需求、约束和变更。
As we saw earlier, requirement types might include business needs, features, and functional and non-functional software requirements.
正如我们前面看到的，需求类型可能包括业务需要、特性以及功能性和非功能性的软件需求。
As we saw earlier, requirement types might include business needs, features, and functional and non-functional software requirements.
正如我们前面看到的，需求类型可能包括业务需要、特性以及功能性和非功能性的软件需求。
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