PMBOK

The 8th edition (November 2025) is built on 6 principles (holistic view, focus on value, embed quality, accountable leadership, integrate sustainability, empowered culture) and 7 performance domains (governance, scope, schedule, finance, stakeholders, resources, risk), and brings 40 non-prescriptive processes back into the book, grouped into five focus areas. The 7th edition (2021) had 12 principles and 8 domains. The PMP exam isn’t written from any single text, but PMBOK remains its core reference.