The PMBOK Guide–Fourth Edition continues the tradition of excellence in project management with a standard that is even easier to understand and implement, with improved consistency and greater clarification.

• New data flow diagrams clarify inputs and outputs for each process.
• Greater attention has been placed on how Knowledge Areas integrate in the context of Initiating, Planning, Executing, Monitoring & Controlling, and Closing process groups.
• Two new processes are featured: Identify Stakeholders and Collect Requirements.