In short: The PMBOK Guide has changed shape dramatically across its recent editions — from the process-heavy 6th edition, to the principles-based 7th edition, to the 8th edition (2025) that blends both. This guide compares the three side by side.
Last updated: 4 July 2026. By Tom, PMP (certified by PMI since 2004).
The 6th edition (2017): process-driven
The 6th edition organised project management around 49 processes, grouped into 5 process groups (Initiating, Planning, Executing, Monitoring and Controlling, Closing) and 10 knowledge areas. It was thorough and prescriptive — a detailed “how-to” that many found comprehensive but heavy.
The 7th edition (2021): principles-based
The 7th edition was a fundamental break. It dropped the 49 processes in favour of 12 principles of project management and 8 performance domains — outcome-oriented areas such as stakeholders, team, and delivery. The emphasis moved from following processes to delivering value and tailoring the approach to each project. Many welcomed the flexibility; others felt it had become too abstract for newcomers.
The 8th edition (2025): structure meets flexibility
The 8th edition reconciles the two. It keeps the principles-and-domains thinking but brings back recognisable process guidance. It defines 6 principles (refined from 12), 7 performance domains, and reintroduces the process groups as 5 Focus Areas (Initiating, Planning, Executing, Monitoring and Controlling, Closing). Across these it presents 40 processes that describe how work is commonly performed, organised within the performance domains and grouped by focus area. New emphasis areas include artificial intelligence, sustainability, PMOs, and procurement.
Side-by-side comparison
| 6th edition (2017) | 7th edition (2021) | 8th edition (2025) | |
|---|---|---|---|
| Core logic | 49 processes | Principles + domains | Principles + domains + focus areas |
| Principles | — | 12 | 6 |
| Performance domains | — | 8 | 7 |
| Process groups | 5 | — | 5 (as Focus Areas) |
| Knowledge areas | 10 | — | — |
| Processes | 49 | none | 40 |
| Feel | Rigid, thorough | Flexible, abstract | Structured and tailorable |
Which edition should you use?
For certification, follow the edition your exam is based on — the PMP exam updates on 9 July 2026 to reflect the 8th edition. In practice, the 8th edition is the current standard and the most balanced: it gives predictive teams the process scaffolding they missed in the 7th edition while preserving the tailoring mindset that agile and hybrid teams rely on.
Frequently asked questions
How many processes are in each edition?
The 6th edition had 49 processes; the 7th edition had none (it was principles-based); the 8th edition has 40.
Did the 8th edition bring back the process groups?
Yes — as five Focus Areas: Initiating, Planning, Executing, Monitoring and Controlling, and Closing.
Is the 7th edition still valid?
It is superseded by the 8th edition (2025), but its principles-and-domains thinking carries forward into it.