ITPEC FE Morning April 2021 Question 46
Source exam: ITPEC FE Morning April 2021Topic: Software Development
ITPEC FE Morning April 2021 — Question 46 of 80
DFD (Data Flow Diagram) Notation — identify what each symbol represents.
Standard DFD symbols:
- •Circle (○) → Process — transforms or processes data
- •Rectangle (□) → External entity — source or destination of data
- •Arrow (→) → Data flow — movement of data between elements
- •Open rectangle / parallel lines (═) → Data store — where data is stored
Why not others:
- (a) Activity — term from UML Activity Diagrams, not DFD notation
- (b) Data flow — represented by arrows, not circles
- (c) Data store — represented by parallel lines (open-ended rectangle)
Key rule: In DFD, circles always represent processes that transform input data into output data.
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