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Reading a Superstate Expansion

publish date: 2026/06/08 10:49:38.720810 UTC

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The diagram below shows the expansion of the Operation superstate from the microwave oven model.

Operation Checking do: check status OK Cook do: run generator Time Timeout Alarm do: display event Turntable fault Emitter fault Done do: buzzer on for 5 secs. Disabled Door open Waiting Cancel

In the Operation superstate expansion, what happens when a Turntable fault or Emitter fault is detected?

Correct Answer

The system transitions to the Alarm state (do: display event) within the Operation superstate

Explanation

Within the Operation superstate, both a Turntable fault and an Emitter fault trigger a transition to the Alarm state (do: display event). The Alarm state displays information about the detected fault. This is a safety sub-state within Operation — the system signals the problem via the display rather than continuing to cook or returning to Waiting.

Reference

Software Engineering, Ian Sommerville, 10th edition

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