Data Flow Diagram
[Level 1 Data Flow Diagram -] this highlights the main functions carried out by the system. As a rule, we try to describe the system using between two and seven functions. SQA
What is a data flow diagram (DFD)?
Data flow diagrams or DFDs help the analysis of systems by showing:
- Data sources
- What processing happens and by whom
- Who uses the data
- Where data is stored and when
- Outputs produced
Representing the complete business system often requires multiple levels of diagram.
The top level, is referred to Level 0 or the Context Diagram, it represents the system as one process box. Level 1 data flow diagrams show incoming data flow, processes and output data flows.
Level 1 DFDs should show a process to handle each incoming data flow and a process to generate each output data flow.
Example Data Flow Diagrams
This example of a level 1 data flow diagrams is free to copy, download and use.
Other example data flow diagrams
Data Flow Diagram - references
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