The standard serves as a foundation for the entire ISO 21500 series, which includes more specialised documents such as ISO 21502 (guidance on project management), ISO 21503 (guidance on programme management), and ISO 21504 (guidance on portfolio management). By adopting ISO 21500:2021, an organisation can ensure that all its project‑related activities are aligned with a coherent, internationally recognised framework.

The original ISO 21500:2012 was highly process-oriented. It closely mirrored the Project Management Institute's (PMI) PMBOK Guide (4th and 5th editions), mapping out 5 process groups and 39 distinct processes.

Details the principles of governing projects, programmes, and portfolios effectively from an executive level. 5. How to Find a Verified ISO 21500 PDF (2021 Edition)