ITPEC FE Morning October 2021 Question 45
ITPEC FE Morning October 2021 — Question 45 of 80
Use Case Diagram — represents user interactions with system functions.
A use case diagram shows actors (users or external systems) and the use cases (system functions) they interact with.
- •Actors are drawn as stick figures outside the system boundary
- •Use cases are drawn as ovals inside the system boundary rectangle
- •Lines connect actors to the use cases they perform
Why not others:
- (a) Activity diagram — models workflow or process flow (like a flowchart)
- (b) Class diagram — shows class structure, attributes, and relationships
- (c) Sequence diagram — shows the order of messages exchanged between objects over time
Key rule: "User interactions with system functions" = use case diagram. Think: stick figures + ovals.
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