A data flow diagram (DFD) lets you graphically represent the flow of data through a system without any indication of time.
Analysts can use DFD to model the functions a system has to carry out and the interactions between those functions in terms of data exchanges between processes.
In the following example, the Publish process sends letters to the Mail prospect and the Mail members processes; these processes send letters to the Prospective Members and Members external entities, and so on:
For more information about the data flow diagram, see Data Flow Diagram (DFD).