DFD Level 0 is also called a Context Diagram. It's a basic overview of the whole system or process being analyzed or modeled. It's designed to be an at-a-glance view, showing the system as a single high-level process, with its relationship to external entities.
What is DFD Level 0 and Level 1?
What is a level 1 DFD? As described previously, context diagrams (level 0 DFDs) are diagrams where the whole system is represented as a single process. A level 1 DFD notates each of the main sub-processes that together form the complete system. We can think of a level 1 DFD as an exploded view of the context diagram.
How do you explain a level 0 diagram?
A level 1 data flow diagram highlights main functions of a system. Visualize incoming data flow, processes and output data flows.
What is a Level 1 flowchart?
A context diagram is a top level (also known as "Level 0") data flow diagram. It only contains one process node ("Process 0") that generalizes the function of the entire system in relationship to external entities.