How to draw data flow diagram?
A data flow diagram illustrates the processes, data stores, and external entities in a business or other system and the connecting data flows. A data flow diagram (DFD) is a graphical representation of the “flow” of data through an information system. A data flow diagram can also be used for the visualization of data processing (structured design). It is common practice for a designer to draw a context-level DFD first which shows the interaction between the system and outside entities. This context-level DFD is then “exploded” to show more detail of the system being modelled. Azna, the original developer of structured design, based on Martin and Estrin’s “data flow graph” model of computation. Data flow diagrams (DFDs) are one of the three essential perspectives of SSADM. The sponsor of a project and the end users will need to be briefed and consulted throughout all stages of a systems evolution. With a dataflow diagram, users are able to visualize how the system will operate, what the
