ISO/IEC 26551:2016，在软件和系统产品线需求工程的工具和方法的背景下: -提供特定于软件和系统产品线以及相关成员产品的需求工程的术语和定义； -定义过程组及其在产品线需求工程期间执行的过程（这些过程根据目的、输入、任务和结果进行描述）； -定义方法能力，以支持每个过程的定义任务； -定义自动化/半自动化任务的工具能力或定义的方法能力。 ISO/IEC 26551:2016涉及一系列产品的需求工具和方法的过程和能力，而不是单个系统。 本国际标准不适用于实物文物。相反，系统级工件和软件生命周期工件，如需求文档、架构数据、验证计划、行为模型等。是使用本国际标准中的方法和工具产生的。在系统的软件组件的情况下，本国际标准可以应用两次:一次用于处理产品线的系统组件，第二次用于处理产品线的软件组件（如果有的话）。产品线流程在不同级别的产品中是递归的。 请注意，本国际标准中的要求适用于系统、软件或服务系列。

ISO/IEC 26551:2016, within the context of tools and methods of requirements engineering for software and systems product lines: - provides the terms and definitions specific to requirements engineering for software and systems product lines and associated member products; - defines process groups and their processes performed during product line requirements engineering (those processes are described in terms of purpose, inputs, tasks, and outcomes); - defines method capabilities to support the defined tasks of each process; - defines tool capabilities to automate/semi-automate tasks or defined method capabilities. ISO/IEC 26551:2016 concerns processes and capabilities of requirements tools and methods for a family of products, not for a single system. This International Standard is not applicable to physical artefacts. Instead, system-level artefacts and software lifecycle artefacts such as requirements documents, architectural data, validation plans, behavioural models, etc. are produced using methods and tools in this International Standard. In the case of the software components of a system, this International Standard can apply twice: once to handle the system elements of the product line and a second time to handle the software elements of the product line, if any. The product line processes are recursive within the different levels of products. NOTE The requirements in this International Standard apply to the family of systems, software or services.