The PMBOK9(r) 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. * Standard language has been incorporated throughout the document to aid reader understanding. * 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 .