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Objects Created During a Sequence

publish date: 2026/06/08 06:26:26.795109 UTC

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The sequence diagram for the Transfer data use case shows a :summary object that is created partway through the sequence. What does the creation of an object during a sequence diagram indicate?

That the object is an external system, not a software component

That the object existed before the sequence started but was hidden

That a new object instance is instantiated as part of the sequence of operations — it did not exist before that point in the interaction

That the object is being destroyed at that point in the sequence

Correct Answer

That a new object instance is instantiated as part of the sequence of operations — it did not exist before that point in the interaction

Explanation

One of the additional features sequence diagrams can show is the creation of objects as part of a sequence of operations. When an object appears partway down the diagram (not at the top), it means a new instance of that object is created during the interaction. In the Transfer data diagram, a :summary object is created to hold summary data that is then uploaded to the national patient records system.

Reference

Software Engineering, Ian Sommerville, 9th edition

Quizzes you can take where this question appears

Interaction Models