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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Hi Mark,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">I agree. This is for our discussion only. I thought the analogy was useful for the restaurant example we have all grown to love
</span><span style="font-size:11.0pt; font-family:Wingdings; color:#1F497D">J</span><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Take Care</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Kevork Krozian</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">IT Pathways Manager</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Ringwood Trade Training Facility
</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Tel: 0419 356 034</span><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> sofdev-bounces@edulists.com.au [mailto:sofdev-bounces@edulists.com.au]
<b>On Behalf Of </b>Mark<br>
<b>Sent:</b> Tuesday, 26 February 2013 8:40 AM<br>
<b>To:</b> Year 12 Software Development Teachers' Mailing List<br>
<b>Subject:</b> Re: [Year 12 SofDev] DFDs</span></p>
<p class="MsoNormal"> </p>
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<p class="MsoNormal">Thanks, Kevork. One learns something new every day!</p>
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<p class="MsoNormal">I wouldn't introduce this complexity to our kids' DFDs and UCDs, however.</p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal">Cheers</p>
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<p class="MsoNormal">Mark</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"> </p>
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<p class="MsoNormal">On 25 February 2013 13:24, Kevork KROZIAN <<a href="mailto:kkrozian@ringwoodsc.vic.edu.au" target="_blank">kkrozian@ringwoodsc.vic.edu.au</a>> wrote:</p>
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<p class="MsoNormal" style=""><span style="color:#1F497D">Hi James,</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D">I just opened <i>Use Cases Requirements in Context</i> by Daryl Kulak and Eamonn Guiney and p 39 states:</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D">“ It is often hard to decide which actors to show on a use case diagram. For example,, when a supplier provides an invoice to a company clerk and the clerk enters the invoice into the system, should
the supplier be included in the diagram ? If the supplier is shown it is called a
<i>secondary</i> actor. Our rule is that the supplier should be shown in the diagram if the supplier’s behaviour impacts the system in any way. For example, if a supplier sends a shipment late and that changes how the system reacts, then the supplier should
be in the diagram.”</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D">In a restaurant a waiter can’t interact with the ordering system until the customer places the order. A delay does not change the response from the system. The waiter would appear in the UCD but not
the DFD which would show the customer – the supplier or source of the data or the order. I wouldn’t place the waiter in the DFD as they are not the source of the data.</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D">Perhaps you can offer details of your textbook if anyone wants to get a hold of it .
</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D">Just my take on the discussion</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D"> </span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D">Kind Regards</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D"> </span></p>
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<p class="MsoNormal" style=""><span style="color:#1F497D">Kevork Krozian</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D">IT Pathways Manager</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D">Ringwood Trade Training Facility
</span></p>
<p class="MsoNormal" style=""><span style="color:#1F497D">Tel: 0419 356 034</span></p>
</div>
<p class="MsoNormal" style=""><span style="color:#1F497D"> </span></p>
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<p class="MsoNormal" style=""><b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">
<a href="mailto:sofdev-bounces@edulists.com.au" target="_blank">sofdev-bounces@edulists.com.au</a> [mailto:<a href="mailto:sofdev-bounces@edulists.com.au" target="_blank">sofdev-bounces@edulists.com.au</a>]
<b>On Behalf Of </b>Vella, James<br>
<b>Sent:</b> Monday, 25 February 2013 10:56 AM<br>
<b>To:</b> <a href="mailto:sofdev@edulists.com.au" target="_blank">sofdev@edulists.com.au</a><br>
<b>Subject:</b> Re: [Year 12 SofDev] DFDs</span></p>
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<p class="MsoNormal" style=""> </p>
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<p><a name="13d134b7f6f50ba7_13d0f2be36291d32__MailE"><span lang="EN-US">Strictly speaking as someone who did DFDs at uni…</span></a></p>
<p><span lang="EN-US"> </span></p>
<p><span lang="EN-US">As Mark has said, we sometimes think in a human sense however DFDs don’t allow us to see the interactions between two EEs.</span></p>
<p><span lang="EN-US"> </span></p>
<p><span lang="EN-US">As Selina has said, the waiter is just the input method – so we can leave it out. I think our students sometimes find it hard at this stage where they have to decide what should and shouldn’t be included in our DFDs.
</span></p>
<p><span lang="EN-US"> </span></p>
<p><span lang="EN-US">In terms of the DFD, you could argue either way for one or the other….but NOT BOTH!
</span><span lang="EN-US" style="font-family:Wingdings">J</span></p>
<p><span lang="EN-US"> </span></p>
<p><span lang="EN-US">That being said, in the UCD you can list both as actors because they both have roles in the system.</span></p>
<p><span lang="EN-US"> </span></p>
<p><span lang="EN-US">I have a whole text book on this stuff from my 2<sup>nd</sup> year at LaTrobe which I’m using with my kids at the moment…DFDs, UCDs, UML the whole kit and caboodle!</span></p>
<p><span lang="EN-US"> </span></p>
<p><span lang="EN-US">Regards</span></p>
<p><span lang="EN-US"> </span></p>
<p><span lang="EN-US">Mr James Vella</span></p>
<p><span lang="EN-US">MacKillop College</span></p>
<p><span lang="EN-US"> </span></p>
<p><span lang="EN-US"> <snip></span></p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal">Mark Kelly</p>
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<p class="MsoNormal"><a href="mailto:mark@vceit.com">mark@vceit.com</a></p>
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