ITPEC FE Morning April 2023 Question 46
ITPEC FE Morning April 2023 — Question 46 of 80
DFD (Data Flow Diagram) Symbols — identify what a circle represents in a DFD.
In a DFD used in structured analysis, four symbols are used:
- •Square (□) → external entity (source or destination of data)
- •Circle (○) → process (transforms input data into output)
- •Parallel lines (═) → data store (where data is held)
- •Arrow (→) → data flow (movement of data between elements)
The circle represents a process.
Why not others:
- (a) Activity — not a DFD term; belongs to UML activity diagrams
- (b) Data flow — represented by arrows, not circles
- (c) Data store — represented by parallel lines (open-ended rectangle)
Key rule: DFD has exactly 4 symbols: square = entity, circle = process, parallel lines = store, arrow = flow.
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