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Class Diagram Reading

publish date: 2026/06/09 19:47:10.607514 UTC

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In a UML class diagram, what does a 1..* multiplicity annotation on one end of an association line mean?

There is one or more (at least one, no upper limit) objects of that class involved in the association

There is exactly one object of that class involved in the association

There are zero or more objects of that class involved in the association

There are between one and a fixed maximum number of objects involved

Correct Answer

There is one or more (at least one, no upper limit) objects of that class involved in the association

Explanation

1..* means one or more - at least one object is involved in the association, with no upper limit. For example, Patient diagnosed-with Condition with 1..* on the Condition end means a patient must have at least one condition, but may have many. This differs from * (zero or more), 1 (exactly one), and 1..4 (between one and four).

Reference

Software Engineering, Ian Sommerville, 10th edition

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