How do you draw a data flow model?

To draw a data flow model, start by identifying the key processes, data stores, external entities, and data flows within the system. Use standardized symbols: circles or ovals for processes, rectangles for external entities, and open-ended rectangles for data stores. Arrows should indicate the direction of data flow between these components. Finally, ensure clarity by labeling each element and maintaining a logical flow that reflects the system's operations.