A Guide to the Project Management Body Of Knowledge (PMBOK® Guide), Fourth Edition

A data flow diagram is provided in each Knowledge Area chapter (Chapters 4 through 12). The data flow diagram is a summary level depiction of the process inputs and process outputs that flow down through all the processes within a specific Knowledge Area. Although the processes are presented here as discrete elements with well-defined interfaces, in practice they are iterative and can overlap and interact in ways not detailed here.