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Data Flow Diagram Guidance:
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What is a Data Flow Diagram?
- A data flow diagram illustrates how data flows throughout the system. It answers the questions:
- How does data enter the system?
- How and where does data travel within the system?
- How does data exit the system?
- How is data changed or transformed throughout the system?
- Where is data stored?
Drawing a Data Flow Diagram:
Step 1: Start off by drawing a context diagram
- A context diagram is a diagram that illustrates how the system works from start to finish. Anyone who views the context diagram should be able to understand at a high-level what is happening within the system.Data Flow Diagram Notations:
- Entity – creates or use data.
- Process – activity that changes data.
- Data Store – stores data
- Data Flow – movement of data. Arrows should denote the direction of data flow
Step 2: Add a red dashed line for any firewalls being used.
Step 3: Add any technical processes that occurs within entities
Step 4: Add information tags to all data flow arrows.
Example Data Flow Diagram (for sensitive and restricted information)
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