UML use case diagrams

Extend and include in the UML use case diagram

UML Use Case Diagram - extend Use Case

Use Case Relationship : Include Relationship And Extend Relationship Easiest Explanation Ever !

UML Use Case Diagram Tutorial | Definition, Symbols and More

ユースケース図のチュートリアルと例（ユースケース図の描き方）

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Understanding include and extend relationship using use case example.

ユースケース図の包含と拡張の関係 - 監視システムの例

Extend Relationship in Business Analyst | Extend Relationships in Use Case Diagrams

UML Use Case Diagram - include relationship

UML Use Case Diagram [Tutorial] Business Analyst Techniques

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USE CASE diagram complete explanation /Include/Extend/Generalization/ UML

Use Case Include and Extend constructs

ユースケース図 - 例を使ったステップバイステップのチュートリアル

Use Case Diagram in UML | Software Engineering

Software Modelling Series: Use Case + Extend + Generalization

What is a use case diagram? Breakdown & best practices