the level 0 diagram, and the level 1 diagram. To make your DFD clear and consistent, you need to use standard symbols and notation to represent the elements and relationships of your system.

etc.). Context Diagram (Level 0 DFD): The highest-level DFD, representing the entire system as a single process. It shows all external entities that interact with the system and the major data flows ...

The first step in creating a valid and complete DFD is to define the scope and level of detail of your diagram. The scope refers to the boundaries and limits of what your DFD covers, such as the ...