PMBOK (Project Management Body of Knowledge) is the sum total of professional knowledge on project management. The Project Management Institute (PMI) uses this document as the main reference for its professional development programs. It is an American national standard. For the first time, guidance on good project management practices in agile and adaptive environments is included in the sixth edition of the PMBOK® Manual. Incorporating this new knowledge makes this publication one of the most powerful, most multifaceted resources for today's project management practitioner.