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Use Cases<o:p></o:p></span></h1> <p class="MsoNormal">A use case represents a function that the system performs. Alternatively, a use case can be thought of as a goal that some actor can achieve with the system. </p> <p class="MsoNormal">An actor association is an arrow connecting an actor to a use case. This arrow represents a conversation between the actor and the system component responsible for executing the use case. </p> <p class="Code"><o:p>&nbsp;</o:p></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_i1030" type="#_x0000_t75" style='width:6in;height:178pt;visibility:visible;mso-wrap-style:square'> <v:imagedata src="IdentifyingUseCases_files/image001.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="864" height="356" src="IdentifyingUseCases_files/image002.jpg" v:shapes="Picture_x0020_1"/><!--[endif]--></span></p> <p class="MsoNormal">A conversation can be viewed as an exchange of messages. For example, the system might send a message to the user by displaying a dialog box. The user might reply to this message by clicking a button on the dialog box. Conversations can be long or short. The initiator of the conversation is indicated by the direction of the arrow, which points from the initiator to the responder.</p> <p class="MsoNormal">Primary actors, such as users, always initiate conversations. Secondary actors, such as servers, always respond to an initiating use case.</p> <p class="MsoNormal">The optional system boundary helps to remind us that use cases are internal to the system and actors are external.</p> <h2><span style="mso-fareast-font-family:"Times New Roman"">Examples<o:p></o:p></span></h2> <h3><span style="mso-fareast-font-family:"Times New Roman"">A Database Browser<o:p></o:p></span></h3> <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_i1029" type="#_x0000_t75" style='width:493pt;height:350.5pt; visibility:visible;mso-wrap-style:square'> <v:imagedata src="IdentifyingUseCases_files/image003.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="986" height="701" src="IdentifyingUseCases_files/image004.jpg" v:shapes="Picture_x0020_2"/><!--[endif]--></span></p> <p class="MsoNormal"><o:p>&nbsp;</o:p></p> <h3><span style="mso-fareast-font-family:"Times New Roman"">An E-Store<o:p></o:p></span></h3> <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_i1028" type="#_x0000_t75" style='width:484pt;height:440.5pt; visibility:visible;mso-wrap-style:square'> <v:imagedata src="IdentifyingUseCases_files/image005.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="968" height="881" src="IdentifyingUseCases_files/image006.jpg" v:shapes="Picture_x0020_3"/><!--[endif]--></span></p> <p class="MsoNormal">Notice that we do not attempt to show structures (like items or the cart) nor the flow of control (e.g., search items, add items, checkout, then check status) in a use case diagram. </p> <h3><span style="mso-fareast-font-family:"Times New Roman"">An ATM Machine<o:p></o:p></span></h3> <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_i1027" type="#_x0000_t75" style='width:505.5pt;height:261pt; visibility:visible;mso-wrap-style:square'> <v:imagedata src="IdentifyingUseCases_files/image007.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="1011" height="522" src="IdentifyingUseCases_files/image008.jpg" v:shapes="Picture_x0020_4"/><!--[endif]--></span></p> <p class="MsoNormal">Notice that we do not include a use case for validating the account holder's identity (read card, read PIN, validate PIN, etc.) While these are functions that an ATM performs, they are not actor goals. In other words, no one uses an ATM machine simply to see if their PIN is valid.</p> <p class="MsoNormal">Notice that the system boundary is optional. Just remember: use cases are inside the system. We are responsible for implementing them. Actors are outside the system. We are only responsible for talking to them.</p> <h3><span style="mso-fareast-font-family:"Times New Roman"">A Word Processor<o:p></o:p></span></h3> <p class="MsoNormal" align="center" style="text-align:center"><span style="mso-no-proof:yes"><!--[if gte vml 1]><v:shape id="Picture_x0020_5" o:spid="_x0000_i1026" type="#_x0000_t75" style='width:493pt;height:419.5pt; visibility:visible;mso-wrap-style:square'> <v:imagedata src="IdentifyingUseCases_files/image009.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="986" height="839" src="IdentifyingUseCases_files/image010.jpg" v:shapes="Picture_x0020_5"/><!--[endif]--></span></p> <p class="MsoNormal">Notice that related use cases, like related classes, can be grouped into packages. These packages might correspond to the menus on a menu bar while the use cases correspond to the menu items.</p> <p class="MsoNormal">Notice that we try to use domain-specific names for actors. In the above example &quot;Author&quot; is domain-specific name for the user of a word processor.</p> <p class="MsoNormal">Notice that the names of use cases and use case packages tend to be verbs rather than nouns.</p> <p class="MsoNormal">We can describe each package using a separate use case diagram. For example, here are the persistence use cases:</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_6" o:spid="_x0000_i1025" type="#_x0000_t75" style='width:440.5pt;height:249pt; visibility:visible;mso-wrap-style:square'> <v:imagedata src="IdentifyingUseCases_files/image011.png" o:title=""/> </v:shape><![endif]--><!--[if !vml]--><img width="881" height="498" src="IdentifyingUseCases_files/image012.jpg" v:shapes="Picture_x0020_6"/><!--[endif]--></span></p> <h2><span style="mso-fareast-font-family:"Times New Roman"">Elaborating a Use Case<o:p></o:p></span></h2> <p class="MsoNormal">A use case diagram by itself is useless. Each use case should be associated with a use case elaboration. A use case elaboration consists of the following information:</p> <p class="Code"><b>ID: </b><span style="mso-bidi-font-weight:bold">Should be a descriptive unique name<b><br/> Actors:</b> The associated primary and secondary actors<b><br/> Description:</b> One or two sentences describing the function or goal<b><br/> Priority: </b>high, medium, or low<b><br/> Risk: </b>high, medium, or low<b><br/> Scenarios:<br/> <span style="mso-tab-count:1">   </span><st1:place w:st="on">Main</st1:place>: </b></span>this is usually the main scenario<b><br/> <span style="mso-tab-count:1">   </span>Alternate 1: </b>an alternate scenario<b><br/> <span style="mso-tab-count:1">   </span>Alternate 2:</b> another alternate scenario<b><br/> <span style="mso-tab-count:1">   </span>...<o:p></o:p></b></p> <h3><span style="mso-fareast-font-family:"Times New Roman"">ID<o:p></o:p></span></h3> <p class="MsoNormal">Every use case should have a unique identifier. For example:</p> <p class="Code">UC.1<br/> UC.2<br/> UC.3.1</p> <h3><span style="mso-fareast-font-family:"Times New Roman"">Priority<o:p></o:p></span></h3> <p class="MsoNormal">Priority measures the importance of a function: high, medium, and low. High priority indicates that the function must be present in the next release or the system will be useless. Medium priority means the function should be available as soon as possible. Low priority means that at some point in the future it would be nice to have.</p> <h3><span style="mso-fareast-font-family:"Times New Roman"">Risk<o:p></o:p></span></h3> <p class="MsoNormal">Risk combines two measurements into a single factor called the <b style="mso-bidi-font-weight:normal">risk magnitude indicator</b>:</p> <p class="Code">the probability that some problem will occur</p> <p class="Code">the severity of the problem</p> <p class="MsoNormal">Examples of problems include:</p> <p class="Code">loss of resources: personnel, money, equipment</p> <p class="Code">unanticipated complexity</p> <p class="MsoNormal">In these lectures only three risk levels are identified:</p> <p class="Code">High, Medium, or low</p> <p class="MsoNormal">Some texts list five risk levels:</p> <p class="Code">high, significant, moderate, minor, and low</p> <p class="MsoNormal">Balancing priority and risk can be tricky. As a general rule of thumb, all of the risk should come at the beginning of a project. If the project fails, let it fail before large commitments of time and money have been made.</p> <h3><span style="mso-fareast-font-family:"Times New Roman"">Scenarios<o:p></o:p></span></h3> <p class="MsoNormal">Scenarios describe possible interactions between actors and the use case. These will be described in the next section.</p> <h3><span style="mso-fareast-font-family:"Times New Roman"">Example:<o:p></o:p></span></h3> <p class="Code"><b>UC.1:</b> Transfer Funds<br/> <b>Actors:</b> Account Holder, Bank Server<br/> <b>Description:</b> The account holder transfers a specified amount of money from a specified source account to a specified destination account.<br/> <b>Priority:</b> high<br/> <b>Risk:</b> medium<br/> <b>Scenarios:</b><br/> <span style="mso-tab-count:1">   </span><st1:place w:st="on"><b>Main</b></st1:place><b>:</b> Funds are transferred successfully<br/> <span style="mso-tab-count:2">      </span>...<br/> <span style="mso-tab-count:1">   </span><b>Alternate 1:</b> Insufficient funds in source account<br/> <span style="mso-tab-count:2">      </span>...<br/> <span style="mso-tab-count:1">   </span><b>Alternate 2:</b> Source or destination accounts are in use<br/> <span style="mso-tab-count:2">      </span>...<br/> <span style="mso-tab-count:1">   </span><b>Alternate 3:</b> Invalid PIN<br/> <span style="mso-tab-count:2">      </span>...</p> <p class="Code"><o:p>&nbsp;</o:p></p> </div> </o:smarttagtype></body></html>