本文件规定了项目、计划和项目组合管理的组织背景和基本概念。它还为组织使用ISO/TC 258制定的标准采用或改进项目、计划和项目组合管理提供指导。 本文件适用于大多数组织，包括公共和私人组织，不取决于组织的规模和类型。它也适用于任何项目、计划和投资组合，无论其复杂性、规模或持续时间如何。 ISO 21502、ISO 21503、ISO 21504和ISO 21505中给出了有关项目、计划和投资组合管理及其治理的进一步指导。

This document specifies the organizational context and underlying concepts for undertaking project, programme and portfolio management. It also provides guidance for organizations to adopt or improve project, programme and portfolio management using the standards prepared by ISO/TC 258. This document is applicable to most organizations, including public and private organizations and it is not dependent on the size and type of the organization. It is also applicable to any project, programme and portfolio, regardless of complexity, size or duration. Further guidance on project, programme and portfolio management, and the governance thereof, is given in ISO 21502, ISO 21503, ISO 21504 and ISO 21505.