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  <mainDescription>&lt;h3>&#xD;
    &lt;a id=&quot;Use-Case Diagrams&quot; name=&quot;Use-Case Diagrams&quot;>Use-Case Diagrams&lt;/a>&#xD;
&lt;/h3>&#xD;
&lt;p>&#xD;
    You may choose to illustrate how a use case relates to actors and other use cases in a use-case diagram (in unusual&#xD;
    cases, more than one diagram). This is useful if the use case is involved with many actors, or has relationships to&#xD;
    many other use cases. A diagram of this kind is of &quot;local&quot; character, since it shows the use-case model from the&#xD;
    perspective of one use case only and is not intended to explain any general facts about the whole use-case model. Refer&#xD;
    to&amp;nbsp;&lt;a class=&quot;elementLinkWithType&quot;&#xD;
    href=&quot;./../../../practice.tech.use_case_driven_dev.base/guidances/guidelines/use_case_model_4C64E97D.html&quot;&#xD;
    guid=&quot;_0VAUsMlgEdmt3adZL5Dmdw&quot;>Guideline: Use-Case Model&lt;/a> for more information.&lt;br />&#xD;
&lt;/p></mainDescription>
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