[Year 12 SofDev] yet another UCD

Fri Feb 11 18:13:19 EST 2011

Hello Michael

I may be mis-interpreting here but
'the direction of flow is obvious from the relationships'
suggests that lines in UCDs show a flow of some kind (data perhaps) and this is NOT the case.

Lines between actor and use case simply show that there is an association or interaction between the two. If there is an arrow head (at the use case end) then it shows which actor is initiating the use case (optional).

Lines between use cases (dotted arrows) show an association between use cases with the direction of the arrow giving an indication of which is the 'base' use case (which, confusingly is the opposite for include and extend)

Apologies if my interpretation of your text is incorrect.
Regards
Robert T-A
Brighton SC

  ----- Original Message ----- 
  From: Michael Wooldridge 
  To: 'Year 12 Software Development Teachers' Mailing List' 
  Sent: Friday, February 11, 2011 3:34 PM
  Subject: Re: [Year 12 SofDev] yet another UCD

  It was created using Microsoft Visio! 

  Yes I deliberately left arrowheads off the association lines. Partly because I was following the example in Adrian Janson's book, and partly because I didn't think it really needed them. I think the direction of flow is obvious from the relationships.

  I believe that sub-systems can be represented by additional system boundaries within the primary system boundary. But, if I am in error, I should be grateful if anyone could definitively tell me so.

  "It is the tragedy of the world that no one knows what he doesn't know - and the less a man knows, the more sure he is that he knows everything" Joyce Cary.

  Michael Wooldridge

  Information Technology Coordinator

  Mornington Secondary College

  1051 Nepean Highway, Mornington 3931

  (: 03 59700250 6: 03 59700299

  mwo at mornsc.vic.edu.au

  Important - This email and any attachments may be confidential. If received in error, please contact us and delete all copies. Before opening or using attachments check them for viruses and defects. Regardless of any loss, damage or consequence, whether caused by the negligence of the sender or not, resulting directly or indirectly from the use of any attached files our liability is limited to resupplying any affected attachments. Any representations or opinions expressed are those of the individual sender, and not necessarily those of the Department of Education and Early Childhood Development. There, that just about covers everyone's arse but yours, sorry.

  From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au] On Behalf Of Mark KELLY
  Sent: Friday, 11 February 2011 3:19 PM
  To: Year 12 Software Development Teachers' Mailing List
  Subject: Re: [Year 12 SofDev] yet another UCD

  Thanks Michael.  That looks jolly nice. What software did you use to create it?

  I notice you don't put arrows on primary actor association lines - is that deliberate?

  And the isolated box for installing the system - I haven't seen that technique before.

  It does seem there's more that one way to skin a UCD.

  On 11 February 2011 13:44, Michael Wooldridge <mwo at mornsc.vic.edu.au> wrote:

  Another warning! I too am a first time poster on this list. Here's a UCD I came up with for RWT. It perhaps has its short-comings, but it might provide another way of looking at things. Let me know if there are any glaringly obvious faults.

  Error! Filename not specified.

  "It is the tragedy of the world that no one knows what he doesn't know - and the less a man knows, the more sure he is that he knows everything" Joyce Cary.

  Michael Wooldridge

  Information Technology Coordinator

  Mornington Secondary College

  1051 Nepean Highway, Mornington 3931

  (: 03 59700250 6: 03 59700299

  mwo at mornsc.vic.edu.au

  Important - This email and any attachments may be confidential. If received in error, please contact us and delete all copies. Before opening or using attachments check them for viruses and defects. Regardless of any loss, damage or consequence, whether caused by the negligence of the sender or not, resulting directly or indirectly from the use of any attached files our liability is limited to resupplying any affected attachments. Any representations or opinions expressed are those of the individual sender, and not necessarily those of the Department of Education and Early Childhood Development. There, that just about covers everyone's arse but yours, sorry.

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