Multiple choice › Modelling tools
Modelling tools
1. Modelling tools
In a data flow diagram (DFD), a data store is shown to:
- Show a loop
- Show a decision
- Represent a person outside the system
- Hold data that persists between processes, such as a file or database table
Answer
D
DFD elements: external entities (sources/sinks), processes, data stores and data flows. Data cannot flow directly between two data stores or two entities.
2. Modelling tools
Which tool defines each data item's name, type, size and an example or validation rule?
- Data dictionary
- Mind map
- Gantt chart
- Storyboard
Answer
A
A data dictionary documents data elements. Sample 2025 Q14 used a data dictionary question.
3. Modelling tools
A designer sketches each screen of an app and the links between them before coding. This tool is a:
- Data dictionary
- Storyboard
- Structure chart
- Desk check
Answer
B
Storyboards show screens and navigation; prototypes may be built from them.
4. Modelling tools
In a class diagram, a hollow-headed (triangle) arrow between two classes shows:
- Inheritance (generalisation): the subclass is a kind of the superclass
- A data store
- Ownership of a database table
- A loop
Answer
A
Inheritance represents an 'is-a' relationship, drawn from subclass to superclass with a hollow triangle head. 2025 Q22 required inheritance symbols and multiplicity.