Entity clustering on ERDs: After clustering related entities to simplify a diagram, will the ERD display more entities than before?

Introduction / Context:
Entity clustering is a presentation technique used in complex ERDs to reduce visual noise by grouping closely related entities into a higher-level box or cluster. The goal is to improve readability while preserving underlying semantics.

Given Data / Assumptions:

• The underlying model may contain many entities and relationships.
• Clustering is a diagramming/abstraction tool; it does not change the logical schema.
• We are comparing the number of entities visually displayed before and after clustering.

Concept / Approach:
By definition, clustering collapses several entities into a single composite icon or box on the diagram. This lowers the number of visible entity symbols, making the ERD easier to navigate. The entities still exist in the repository or model, but the diagram shows fewer shapes, not more. Therefore, a clustered ERD will display fewer entities than the unclustered version.

Step-by-Step Solution:

Verification / Alternative check:
Compare screenshots before and after clustering; the visual count of entity boxes is lower post-cluster, though the model content remains unchanged.

Why Other Options Are Wrong:

• “Correct” in the prompt would mean more entities appear, which contradicts the purpose of clustering.
• Limiting to “logical” or “physical” models mischaracterizes clustering, which is a diagramming convenience usable in either.

Common Pitfalls:
Assuming clustering alters normalization or keys—it does not. Also, hiding too much can obscure important relationships; provide detailed views when needed.

Final Answer:
Incorrect