volume_mute
Multiplicity Notation
publish date: 2026/06/08 08:10:21.942256 UTC
volume_muteMatch each multiplicity notation to its correct meaning in a UML class diagram.
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Notation
1
1..*
*
1..4
Meaning
An exact number of objects is involved — in this example, between 1 and 4 objects
Exactly one object is involved in the association
One or more objects are involved (at least one, but no upper limit)
An indefinite number of objects may be involved (zero or more)
Correct Answer
(1) 1,Exactly one object is involved in the association
(2) 1..*,One or more objects are involved (at least one, but no upper limit)
(3) *,An indefinite number of objects may be involved (zero or more)
(4) 1..4,An exact number of objects is involved — in this example, between 1 and 4 objects
Explanation
UML multiplicity notation: 1 = exactly one; 1..* = one or more (at least one); * = zero or more (indefinite); 1..4 = between 1 and 4. For example, the (1..*) multiplicity on Patient-to-Condition means a patient may suffer from one or more conditions, and the same condition may be associated with one or more patients.
Reference
Software Engineering, Ian Sommerville, 9th edition