Modelling a proposed system during the design phase helps us clarify what is intended. The model shows what is needed, free from any corrupting influences of methodology, hardware, or circumstances. As you might surmise by the name, Data Flow Diagrams focus on how data processes through a system. Each of these components is given a distinct diagrammatic representation. It is an abstract model .
Flow charts depict the sequential progression of logic required in creating an algorithm.
DFDs strive to capture the essence of a system in one snapshot. B. Creating Data Flow Diagrams 1. The Level 0 DFD presents the entire system in its contextual setting. This is the level 0 DFD or Context Diagram 2. Information flow shows the pieces of data involved in the problem, and the transformations this data must undergo to meet the requirements.