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Generalization Arrow Direction

publish date: 2026/06/09 19:47:10.914563 UTC

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In a UML generalization hierarchy, the open arrowhead (hollow triangle) points:

From superclass to subclass - pointing downward toward the more specific class

In both directions - generalization uses bidirectional arrows

From subclass to superclass - pointing upward toward the more general class

Horizontally between sibling classes at the same level

Correct Answer

From subclass to superclass - pointing upward toward the more general class

Explanation

In UML, the generalization arrow (open hollow triangle) points from the subclass upward to the superclass. This represents the 'is-a' relationship - e.g., an arrow from Hospital Doctor pointing up to Doctor indicates that Hospital Doctor IS-A Doctor. The arrowhead points toward the more general class.

Reference

Software Engineering, Ian Sommerville, 10th edition

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