ITPEC IP April 2023 Question 95
Which of the following is the most appropriate description concerning DFD?
Explanation
It focuses on the flow of data — a DFD (data flow diagram) relates the flows of data to the processes that handle them.
A DFD uses four elements: processes that transform data, data flows (arrows), data stores, and external entities that are sources or destinations of data. It shows what data moves where and what processing it passes through, not when or in what order things happen.
Answer (d)
Why not others:
- •(a) — showing how a system's state changes as time passes and the situation changes is a state transition diagram
- •(b) — representing the entities a system handles, their relationships and the data structure is an E-R diagram
- •(c) — showing the attributes and operations of the elements a system is made of, and the relations between them, is a UML class diagram
Key rule: Choose the diagram by what it models: data flow and processing is a DFD, data structure an E-R diagram, state changes a state transition diagram, objects a class diagram.
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