Exam-style question
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Explain the difference between representational abstraction and abstraction by generalisation or categorisation.
Model answer
What a good answer should say
- Representational abstraction creates a representation by removing unnecessary details.
- Abstraction by generalisation or categorisation groups items that have common characteristics and can arrange those groups in a hierarchy of the 'is a kind of' type.
Explanation
Why this works
The first form changes the level of detail in a representation. The second form identifies shared characteristics and uses them to create categories and possible hierarchical relationships.
Common mistake
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