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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I think one of the main problems is that we are looking at
software development through ‘SDLC’ eyes. The reason why the
context diagram starts to get out of control, (I feel), is that we start
looking at a small part of the software solution in U3O2 and the entire system
is much bigger than this. However, it is only the intention of U3O2 that
we start prototyping a small software solution and we need to keep this in
mind. I am not sure that giving students a context diagram or DFD for
U3O2 is the best move. It does help to illustrate the analysis of the
system (and that’s why it is a tool to include in a SRS), but the key
parts of the SRS for U3O2 are the functional and non-functional requirements,
scope, etc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(My 2^2c!)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Adrian<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:18.0pt;color:#002060'>Adrian
Janson </span></b><b><span style='font-size:7.0pt;color:#002060'>B.Sc, Dip.Ed,
M.Ed<br>
</span></b><b><span style='font-size:14.0pt;color:#002060'>Director of ICT<br>
</span></b><span style='color:#244061'>Melbourne High School, Forrest Hill,
South Yarra, Victoria 3141 Australia.<br>
Phone: 03 9826 0711 International: +61 3 9826 0711<br>
Fax: 03 9826 8767 International: +61 3 9826 8767<br>
E-mail: <a href="janson.adrian.a@edumail.vic.gov.au">janson.adrian.a@edumail.vic.gov.au</a><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#244061'>Website: <a
href="http://www.mhs.vic.edu.au/">http://www.mhs.vic.edu.au</a></span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#244061'>Blog: <a
href="http://jansona.edublogs.org/" target="_blank">http://jansona.edublogs.org</a></span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><a name="_MailEndCompose"><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></a></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<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>Esther Andrews<br>
<b>Sent:</b> Monday, 9 May 2011 2:32 PM<br>
<b>To:</b> Year 12 Software Development Teachers' Mailing List<br>
<b>Subject:</b> Re: [Year 12 SofDev] U3O2 module context diagram<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Funny how the apparently simple can end up being complex.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Given your description I’d say the customer does not
directly provide input into the system so should not be on the Context diagram.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Esther<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<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 KELLY<br>
<b>Sent:</b> Monday, 9 May 2011 2:13 PM<br>
<b>To:</b> Year 12 Software Development Teachers' Mailing List<br>
<b>Subject:</b> [Year 12 SofDev] U3O2 module context diagram<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi all. I',m adapting the detailed example of SD U3O2 from
the study design for my own U3O2; I'm fiddling at the edges and not changing
the overall shape of the example where the task is to create a specific module
(cost calculator) in a larger ordering/accounting system that takes order data
from a corporate website.<br>
While getting into creating the SRS I thought the context diagram would be a
doddle. One external entity, the customer. The system in the
circle is the cost calculator module. One data flow from the customer
with order information. One data flow to the customer with the invoice. Done.<br>
<br>
Then I realised that from the module's perspective the rest of the ordering
system might be seen as an external entity since the module has no control over
the system's operation but must exchange data with it.<br>
<br>
Then I realised that the system also would see the corporate website as an
external entity for similar reasons. So the customer would interact with the
website which would interact with the system, which would interact with the
module that the students will be writing.<br>
<br>
But if I showed the customer providing an order to the website, that would be a
data flow between external entities which we are not supposed to show in a
CD/DFD.<br>
<br>
How would you guys interpret a situation like this?<br clear=all>
<br>
-- <br>
Mark Kelly<br>
Manager of ICT, Reporting, IT Learning Area<br>
McKinnon Secondary College<br>
McKinnon Rd McKinnon 3204, Victoria, Australia<br>
Direct line / Voicemail: +613 8520 9085, Fax +613 9578 9253<br>
<a href="mailto:kel@mckinnonsc.vic.edu.au" target="_blank">kel@mckinnonsc.vic.edu.au</a><br>
VCE IT Lecture Notes: <a href="http://vceit.com" target="_blank">http://vceit.com</a><br>
Moderator: IT Applications Edulist<br>
<br>
Want a good time? Call 0112358. Ask for Mr Fibonacci.<o:p></o:p></p>
</div>
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