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Five Essential UML Diagram Types

publish date: 2026/06/08 03:53:18.884377 UTC

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Match each UML diagram type with the primary aspect of a system that it represents.

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Diagram Type

Activity diagrams
Use case diagrams
Sequence diagrams
Class diagrams
State diagrams

Aspect

Interactions between actors and the system and between system components
Activities involved in a process or data processing
Object classes and their associations
Interactions between actors and the system and between system components

Correct Answer

(1) Activity diagrams,Activities involved in a process or data processing
(2) Use case diagrams,Interactions between a system and its environment
(3) Sequence diagrams,Interactions between actors and the system and between system components
(4) Class diagrams,Object classes and their associations
(5) State diagrams,How the system reacts to internal and external events

Explanation

The five essential UML diagram types are: Activity diagrams (activities involved in a process or data processing), Use case diagrams (interactions between a system and its environment), Sequence diagrams (interactions between actors and the system and between system components), Class diagrams (object classes and their associations), and State diagrams (how the system reacts to internal and external events).

Reference

Software Engineering, Ian Sommerville, 9th edition

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