Data flow diagrams
Data flow diagrams model the flow of information within an Organisation. Diagram 1.1 below shows an example of a level0 DFD called a Context diagram. This models the whole system as a single process and the dashed box represents the boundary of the system. Diagram 1.0 below explains the notations of DFD.
Above Diagram 1.0 displays notations of DFD.
Above Diagram 1.1 displays a Context diagram