Hi again Allan<br><br>The study design example was doing its best to curtail the scope of the student's software: a wise and noble ambition. <br>I can appreciate why the example wanted to exclude the need for complex
wireless data transmission from the student's scope, but the unrealistic
repercussions in the CD/DFD (as you described) don't sit well either.<br><br>
I don't know what the official definition of a data store is, or even if there is one at all.<br>If a program writes data to a file, but never reads it back again, is it still a data store? After all, once it's written it's not really <b>in</b> the system any more. <br>
It's a handkerchief dropped by the roadside waiting for the other software to come along and pick it up.<br>Most of the time our DFD data stores are read/write. <br>This rare exception in the Cantina example is unusual and (I find) hard to handle using basic DFD/CD theory because it is so unusual.<br>
<br>Anyway, that's my 4 Mauritanian ouguiyas and 2 khoums' worth.<br><br>On 29 July 2011 09:58, Allan Barnes <span dir="ltr"><<a href="mailto:abarnes@aiet.com.au">abarnes@aiet.com.au</a>></span> wrote:<br><div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div link="blue" vlink="purple" lang="EN-AU">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Hi Mark<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">I have to admit I didn’t spend a lot of time reading the
case study in the study design, although I did find it a little confusing. I
don’t quite understand the idea behind the kitchen system – if I
was designing the info system (which clearly I’m not) the external entity
at the end of the line would be the chef who stands there and yells out the
orders a la Gordon Ramsey but without the swearing, and the kitchen
system would therefore just be the display mechanism for the order to be received,
similar to a printer, for example. The transmitting software I also would not
have considered as an entity either as it is just the method used to transfer
the data from the waiter to the chef, and therefore is not part of the systems
analysis model.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">To me it is:<u></u><u></u></span></p>
<p class="MsoNormal"><u></u><span>
</span></p><table align="left" cellpadding="0" cellspacing="0">
<tbody><tr>
<td width="0" height="7"></td>
</tr>
<tr>
<td></td>
<td><img src="" width="629" height="89"></td>
</tr>
</tbody></table>
<u></u><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span><p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<br clear="ALL">
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">As pointed out, if it is a context diagram the data store is not
shown, but if it is a DFD it is. I read the case study once and couldn’t
see any reference to whether it needed to be a DFD or context diagram –
it may have been in there and I missed it.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">The way I was taught at Uni was that the system analysis stage
is not interested in how the information gets from point A to point B –
that is the domain of the person designing the system, thus the hand-held PC,
the transmitting software and the display are irrelevant to the analysis of the
system. If Gordon says he wants his waiters to have hand held PC’s and
the data to be transmitted somehow to somewhere and displayed on a screen then
this is part of my design of the system but is not relevant to how the information
is gathered and processed.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">I don’t know if systems analysis and design has changed
since my uni days but we were always taught a very strict delineation between
analysis and design and what was considered in each stage.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">The Aussie dollar is doing well so I’m back on the Aussie
(no disrespect to the PNG currency).<u></u><u></u></span></p><div class="im">
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Kind regards<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Allan Barnes, CEO<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Australian Institute of Education and Training<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">P.O. Box 171<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Brunswick West 3055<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Melbourne, Victoria<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Ph: (03) 9387 2051<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">FAX: (03) 9387 3470<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Mobile: 0409 428 221<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
</div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:10.0pt" lang="EN-US">From:</span></b><span style="font-size:10.0pt" lang="EN-US"> <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>Mark KELLY<br>
<b>Sent:</b> Friday, 29 July 2011 9:32 AM</span></p><div class="im"><br>
<b>To:</b> Year 12 Software Development Teachers' Mailing List<br>
</div><b>Subject:</b> Re: [Year 12 SofDev] Oliver's Mexican Cantina<u></u><u></u><p></p>
</div><div class="im">
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Alan. The kitchen display,
to my way of thinking, is not connected to the Cantina software at all (a
conscious decision by the author to limit the scope of the mobile device's
functional requirements.) <br>
<br>
Between the mobile software and the kitchen system (which is an external
entity) lies the transmitting software (also an external entity), and you don't
show communications between external entities.<br>
<br>
2 pigs and 1 yam's worth (for our Papua New Guinean readers)<br>
<br>
Regards<br>
Mark<u></u><u></u></p>
</div><div><div class="im">
<p class="MsoNormal">On 28 July 2011 14:03, Allan Barnes <<a href="mailto:abarnes@aiet.com.au" target="_blank">abarnes@aiet.com.au</a>> wrote:<u></u><u></u></p>
</div><div>
<div><div class="im">
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Hi Mark</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">To my thinking the second terminator is
the kitchen display and not the software itself. This is because (IMHO) the
software is the method of transmitting the text file containing the order
whereas the kitchen display is if you like the end user. Happy to be shot down
in flames though. My 1c worth.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
</div><p class="MsoNormal"><b><span lang="EN-US">Error! Filename not specified.</span></b><u></u><u></u></p><div><div></div><div class="h5">
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Kind regards</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Allan Barnes, CEO</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Australian Institute of
Education and Training</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">P.O. Box 171</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Brunswick West 3055</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Melbourne, Victoria</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Ph: (03) 9387 2051</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">FAX: (03) 9387 3470</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D" lang="EN-US">Mobile: 0409 428 221</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span><u></u><u></u></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:10.0pt" lang="EN-US">From:</span></b><span style="font-size:10.0pt" lang="EN-US"> <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>Mark KELLY<br>
<b>Sent:</b> Thursday, 28 July 2011 1:43 PM<br>
<b>To:</b> Year 12 Software Development Teachers' Mailing List<br>
<b>Subject:</b> [Year 12 SofDev] Oliver's Mexican Cantina</span><u></u><u></u></p>
</div>
<div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hi all.
I'm playing with an SRS based on the Cantina (study design p.84).<br>
<br clear="all">
I've got to the context diagram, and I've attached a first draft. I'm not
100% of a couple of things:<br>
<br>
1. I have excluded the customers as an external entity since they don't
interact with the system: the waiter does.<br>
<br>
2. I included the transmission software as an external entity since it takes
the text file from the ordering software. But if the text file is saved
should it then be considered outside of the system rather than an active data
store within the system? In that case, the transmission software should
not be included at all.<br>
<br>
Any ideas?<br>
<br>
Cheers<br>
Mark<br>
<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: <a href="http://www.edulists.com.au/" target="_blank">IT Applications
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Want a good time? Call 0112358. Ask for Mr Fibonacci.<u></u><u></u></p>
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<br>
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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>
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VCE IT Lecture Notes: <a href="http://vceit.com" target="_blank">http://vceit.com</a><br>Moderator: <a href="http://www.edulists.com.au/" target="_blank">IT Applications Edulist</a><br><br><font>Want a good time? Call 0112358. Ask for Mr </font>Fibonacci.<br>