Data flow diagrams (DFD) are graphical representation of the “flow” of data through an information system, modeling its process aspects. A Data Flow Diagram is often used as a preliminary step to create an overview of the system, which can later be elaborated.
Data flow diagram is a popular way to visualize the major steps and data involved in software system processes. This is not same as business process modeling; DFDs were usually used to show data flows in computer systems, although in theory be applied to business process modeling. DFDs are useful to document the major data flow or to explore a new high-level design in terms of data flow.
Understanding the Concepts of Data Flow Diagrams
Concept of Data Flow Diagrams (abbreviated as DFDs) was introduced by De-Marco in 1978 and also by Gane and Sarnon in 1979. DFD is an important tool used by system analyst.