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      <blockquote>
  <p>Use Case Diagram</p>
</blockquote>



<h2 id="environment-and-prerequisite">Environment and Prerequisite</h2>

<ul>
  <li>UML</li>
</ul>



<h2 id="use-case-diagram">Use Case Diagram</h2>

<h3 id="use-case">Use Case</h3>

<ul>
  <li><strong>Use Case</strong>: Text story which user use system to achieve a goal.</li>
</ul>

<p><img src="https://twpower.github.io/images/20241128_364/use-case.png">
</p>



<h3 id="use-case-diagram-1">Use Case Diagram</h3>

<ul>
  <li><strong>Use Case Diagram</strong>: Diagram which shows telationships between actors and use cases.</li>
</ul>

<p><img src="https://twpower.github.io/images/20241128_364/use-case-diagram.png">
</p>



<h3 id="actor-use-case-system-boundary">Actor, Use Case, System Boundary</h3>

<h4 id="actor">Actor</h4>

<ul>
  <li><strong>Actor</strong>: External entity which interacts with system.</li>
  <li>The diagram represents it with an human shape icon.</li>
  <li>In <a href="#use-case">Use Case</a> image, “Registered User” is an actor.</li>
</ul>

<h4 id="use-case-1">Use Case</h4>

<ul>
  <li>Check definition in <a href="#use-case">Use Case</a>.</li>
  <li>The diagram represents it with an oval.</li>
  <li>In <a href="#use-case">Use Case</a> image, “Edit an article.” is use case.</li>
</ul>

<h4 id="system-boundary">System Boundary</h4>

<ul>
  <li><strong>System Boundary</strong>: System model to design.</li>
  <li>The diagram represents it with an rectangle.</li>
  <li><a href="#use-case-diagram-1">Use Case Diagram</a> image, “System Boundary” is system boundary.</li>
</ul>



<h3 id="relationship">Relationship</h3>

<h4 id="association">Association</h4>

<ul>
  <li><strong>Association</strong>: Shows interaction between actor and use case.</li>
  <li>Ex) User edit board.</li>
</ul>

<p><img src="https://twpower.github.io/images/20241128_364/association.png">
</p>

<h4 id="include">Include</h4>

<ul>
  <li><strong>Include</strong>: It refers to a relationship that one use case include another use case.</li>
  <li>Ex) Compose post includes adding image.</li>
</ul>

<p><img src="https://twpower.github.io/images/20241128_364/include.png">
</p>

<h4 id="extend">Extend</h4>

<ul>
  <li><strong>Extend</strong>: It refers to a relationship that can extend to another use case when certain conditions are met.</li>
  <li>Ex) Flight reservation allows seat selection under certain conditions.</li>
</ul>

<p><img src="https://twpower.github.io/images/20241128_364/exclude.png">
</p>

<h4 id="generalization">Generalization</h4>

<ul>
  <li><strong>Generalization</strong>: It represents a concept similar to inheritance, where a use case is a generalized parent use case of other use cases.</li>
</ul>

<p><img src="https://twpower.github.io/images/20241128_364/generalization.png">
</p>



<h2 id="reference">Reference</h2>

<ul>
  <li><a href="https://en.m.wikipedia.org/wiki/Use_case">https://en.m.wikipedia.org/wiki/Use_case</a></li>
  <li><a href="https://en.wikipedia.org/wiki/Use_case_diagram">https://en.wikipedia.org/wiki/Use_case_diagram</a></li>
  <li><a href="https://www.geeksforgeeks.org/use-case-diagram/">https://www.geeksforgeeks.org/use-case-diagram/</a></li>
  <li><a href="https://www.ibm.com/docs/ko/rational-soft-arch/9.7.0?topic=diagrams-use-case">https://www.ibm.com/docs/ko/rational-soft-arch/9.7.0?topic=diagrams-use-case</a></li>
</ul>

      
        
        
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TWpower’s Tech Blog

Use Case Diagram
Environment and Prerequisite
UML
Use Case Diagram
Use Case
Use Case: Text story which user use system to achieve a goal.
Use Case Diagram
Use Case Diagram: Diagram which shows telationships between actors and use cases.
Actor, Use Case, System Boundary
Actor
Actor: External entity which interacts with system.
The diagram represents it with an human shape icon.
In Use Case image, “Registered User” is an actor.
Use Case
Check definition in Use Case.
The diagram represents it with an oval.
In Use Case image, “Edit an article.” is use case.
System Boundary
System Boundary: System model to design.
The diagram represents it with an rectangle.
Use Case Diagram image, “System Boundary” is system boundary.
Relationship
Association
Association: Shows interaction between actor and use case.
Ex) User edit board.
Include
Include: It refers to a relationship that one use case include another use case.
Ex) Compose post includes adding image.
Extend
Extend: It refers to a relationship that can extend to another use case when certain conditions are met.
Ex) Flight reservation allows seat selection under certain conditions.
Generalization
Generalization: It represents a concept similar to inheritance, where a use case is a generalized parent use case of other use cases.
Reference
https://en.m.wikipedia.org/wiki/Use_case
https://en.wikipedia.org/wiki/Use_case_diagram
https://www.geeksforgeeks.org/use-case-diagram/
https://www.ibm.com/docs/ko/rational-soft-arch/9.7.0?topic=diagrams-use-case

[UML](EN) Use Case Diagram

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