ITPEC FE Morning October 2022 Question 45

It shows how actors, external users or machines, interact with a system — a use case diagram captures the system's functions from the outside.

A use case diagram draws actors (stick figures) outside a system boundary and use cases (ovals) inside it, joined by associations. It is used in requirements definition to show what the system does for whom, not how it does it internally.

Answer (d)

Why not others:

• •(a) — an object's life cycle as finite state transitions is a state machine diagram
• •(b) — messages exchanged along object lifelines in time order is a sequence diagram
• •(c) — the flow from one activity to the next in a system or business process is an activity diagram

Key rule: Actors and use cases, use case diagram; lifelines and messages, sequence diagram; states and transitions, state machine diagram; activities and flow, activity diagram.

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