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Three Useful UML Model Types

publish date: 2026/06/12 07:12:25.652576 UTC

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Three UML model types are particularly useful for adding detail to use case and architectural models. Match each model type to its classification and representation.

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Model Type

Subsystem models
State machine models
Sequence models

Classification and Representation

Structural model - logical groupings of objects into coherent subsystems; represented as class diagrams with each subsystem shown as a package with enclosed objects
Dynamic model - sequence of object interactions; represented using UML sequence or collaboration diagrams
Dynamic model - how objects change state in response to events; represented using UML state diagrams

Correct Answer

(1) Subsystem models,Structural model - logical groupings of objects into coherent subsystems; represented as class diagrams with each subsystem shown as a package with enclosed objects
(2) Sequence models,Dynamic model - sequence of object interactions; represented using UML sequence or collaboration diagrams
(3) State machine models,Dynamic model - how objects change state in response to events; represented using UML state diagrams

Explanation

The three most useful UML model types: Subsystem models (structural) show logical groupings using package notation; Sequence models (dynamic) show the sequence of object interactions for each significant interaction - there should be a sequence model for each use case; State machine models (dynamic) show state changes in response to messages and events.

Reference

Software Engineering, Ian Sommerville, 10th edition

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