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style="mso-fareast-font-family:"Times New Roman"">Relationships between Use Cases<o:p></o:p></span></h1> <h2><span style="mso-fareast-font-family:"Times New Roman"">Include<o:p></o:p></span></h2> <p class="MsoNormal">If some task is performed as part of several use cases, then we can extract this task as a separate use case that is included by other use cases. This can simplify scenarios.</p> <p class="MsoNormal" align="center" style="text-align:center"><span style="mso-no-proof:yes"><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"> <v:stroke joinstyle="miter"/> <v:formulas> <v:f eqn="if lineDrawn pixelLineWidth 0"/> <v:f eqn="sum @0 1 0"/> <v:f eqn="sum 0 0 @1"/> <v:f eqn="prod @2 1 2"/> <v:f eqn="prod @3 21600 pixelWidth"/> <v:f eqn="prod @3 21600 pixelHeight"/> <v:f eqn="sum @0 0 1"/> <v:f eqn="prod @6 1 2"/> <v:f eqn="prod @7 21600 pixelWidth"/> <v:f eqn="sum @8 21600 0"/> <v:f eqn="prod @7 21600 pixelHeight"/> <v:f eqn="sum @10 21600 0"/> </v:formulas> <v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/> <o:lock v:ext="edit" aspectratio="t"/> </v:shapetype><v:shape id="Picture_x0020_1" o:spid="_x0000_i1028" type="#_x0000_t75" style='width:431.5pt;height:261pt;visibility:visible;mso-wrap-style:square'> <v:imagedata src="relations_files/image001.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="863" height="522" src="relations_files/image002.jpg" v:shapes="Picture_x0020_1"/><!--[endif]--></span></p> <p class="MsoNormal">An included use case is like a helper subroutine that is called by other higher level functions.</p> <p class="MsoNormal">Included use cases are usually included by multiple use cases.</p> <p class="MsoNormal">Included use cases usually don't have actor associations.</p> <h2><span style="mso-fareast-font-family:"Times New Roman"">Extend<o:p></o:p></span></h2> <p class="MsoNormal">While control is explicitly transferred from a use case to an included use case, control is implicitly transferred from a use case to one of its extensions. </p> <p class="MsoNormal">There are several examples from programming:</p> <p class="Code">Throwing and catching exceptions</p> <p class="Code">Calling a polymorphic function</p> <p class="MsoNormal">The advantage is that use case extensions can be replaced without modifying the extended use case.</p> <p class="MsoNormal" align="center" style="text-align:center"><span style="mso-no-proof:yes"><!--[if gte vml 1]><v:shape id="Picture_x0020_2" o:spid="_x0000_i1027" type="#_x0000_t75" style='width:170.5pt;height:171pt; visibility:visible;mso-wrap-style:square'> <v:imagedata src="relations_files/image003.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="341" height="342" src="relations_files/image004.jpg" v:shapes="Picture_x0020_2"/><!--[endif]--></span></p> <h2><span style="mso-fareast-font-family:"Times New Roman"">Generalization<o:p></o:p></span></h2> <p class="MsoNormal">If we think of scenarios as use case instances, then use case A generalizes use case B if every B scenario is also an A scenario.</p> <p class="MsoNormal">For example, there might be several ways to handle requests for large amounts of cash: notify manager or call security. Any notify manager scenario is a handle large request scenario.</p> <p class="MsoNormal" align="center" style="text-align:center"><span style="mso-no-proof:yes"><!--[if gte vml 1]><v:shape id="Picture_x0020_3" o:spid="_x0000_i1026" type="#_x0000_t75" style='width:367pt;height:267pt; visibility:visible;mso-wrap-style:square'> <v:imagedata src="relations_files/image005.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="734" height="534" src="relations_files/image006.jpg" v:shapes="Picture_x0020_3"/><!--[endif]--></span></p> <p class="MsoNormal"><o:p>&nbsp;</o:p></p> <h3><span style="mso-fareast-font-family:"Times New Roman"">Abstract Use Cases<o:p></o:p></span></h3> <p class="MsoNormal">Note that if A generalizes B, then B inherits all of the attributes of A. For example, B inherits the priority of A. B also inherits the actor associations of B.</p> <p class="MsoNormal">With this in mind, we can simplify use case diagrams by introducing the notion of an abstract use case. An abstract use case (shown with an italicized name) has no scenarios. All of the scenarios are instances of specializations.</p> <p class="MsoNormal">For example:</p> <p class="MsoNormal" align="center" style="text-align:center"><span style="mso-no-proof:yes"><!--[if gte vml 1]><v:shape id="Picture_x0020_4" o:spid="_x0000_i1025" type="#_x0000_t75" style='width:367pt;height:267pt; visibility:visible;mso-wrap-style:square'> <v:imagedata src="relations_files/image007.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="734" height="534" src="relations_files/image008.jpg" v:shapes="Picture_x0020_4"/><!--[endif]--></span></p> </div> </body></html>