In a use case, which is one of the two commonly used relationships?

The correct answer is D. Extend. Extend (<<extend>>) is one of the two standard relationships in UML use case diagrams, alongside include (<<include>>). The extend relationship models optional or conditional behavior - a use case that may add steps to a base use case under certain conditions (e.g., "Apply…

Requirements Analysis and Design Definition

Question

Options

AInherit
BIdentify
CDistribute
DExtend

How the community answered

(23 responses)

A
4% (1)
C
4% (1)
D
91% (21)

Explanation

Extend (<<extend>>) is one of the two standard relationships in UML use case diagrams, alongside include (<<include>>). The extend relationship models optional or conditional behavior - a use case that may add steps to a base use case under certain conditions (e.g., "Apply Discount" extends "Checkout" only when a coupon is used).

A. Inherit - UML use cases use generalization (not "inherit") for parent-child relationships, and it is not considered one of the two commonly used relationships.
B. Identify - Not a UML use case relationship at all.
C. Distribute - Also not a recognized UML use case relationship.

Memory tip: Think "I E" - Include and Extend are the two. Include = always happens (required), Extend = sometimes happens (optional). If you remember "IE" like Internet Explorer, you'll never mix them up on an exam.

Topics

#use cases#extend relationship#UML modeling#use case relationships

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