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<DIV><FONT face=Arial size=2>Hello Kevork</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>arrow directions make sense for both include and
extend if you think of them as saying "this extends that" - "this" being the
tail-end and "that" being the use case pointed at. So, for example, "order wine
extends food order" - in other words it adds to its functionality. You can do
the same for includes - unfortunately your example doesn't have
one.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As for the association with data, DFDs and use
cases are not the same and don't serve the same purpose. Use cases are about the
system doing something useful for the user and I guess the wikipedia example is
trying to illustrate this without getting too technical (??). I imagine if we
are talking about an information system then it a use case would ordinarily
involve information in some way</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> For what its worth, I have attached a doc I
prepared some time ago in preparation for the new SD.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards</FONT></DIV>
<DIV><FONT face=Arial size=2>Robert T-A</FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=kevork@edulists.com.au href="mailto:kevork@edulists.com.au">Kevork
Krozian</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=sofdev@edulists.com.au
href="mailto:sofdev@edulists.com.au">'Year 12 Software Development Teachers'
Mailing List'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, November 23, 2010 8:24
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Year 12 SofDev] Use Case
dilemma (s)</DIV>
<DIV><BR></DIV>
<DIV class=WordSection1>
<P class=MsoNormal>Hi folks,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I have attached a Use Case from Wikipedia and also used in
Mark’s brilliant online notes. I have discussed it with contacts at tertiary
level and there is uncertainty about the representations.<o:p></o:p></P>
<P class=MsoNormal>Firstly, there are a number of use cases within the system
that do not have any data processing yet appear eg. Eat food, cook food, drink
wine.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Thinking back to DFDs each process has to have data
processing underpinning eg. Deliver order is not a valid process unless there
is a data component such as deliver invoice OR pay invoice or transfer money
is not a process unless it is to request receipt or update invoice.
<o:p></o:p></P>
<P class=MsoNormal>I hope I am making sense. The consensus is that these use
cases are not part of the system.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Secondly, the arrows on includes and extends are in reverse
positions . Has anyone given any thought as to why that is ??<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Speak soon<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Kevork Krozian<o:p></o:p></P>
<P class=MsoNormal>Edulists Creator Administrator<o:p></o:p></P>
<P class=MsoNormal>www.edulists.com.au<o:p></o:p></P>
<P class=MsoNormal>tel: 0419 356 034<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<P>
<HR>
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