[Year 12 SofDev] Use Case dilemma (s)

[Timmer-Arends]

Hello Kevork

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.

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

 For what its worth, I have attached a doc I prepared some time ago in preparation for the new SD.

Regards
Robert T-A
  ----- Original Message ----- 
  From: Kevork Krozian 
  To: 'Year 12 Software Development Teachers' Mailing List' 
  Sent: Tuesday, November 23, 2010 8:24 AM
  Subject: [Year 12 SofDev] Use Case dilemma (s)


  Hi folks,

   

  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.

  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.

   

  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. 

  I hope I am making sense. The consensus is that these use cases are not part of the system.

   

  Secondly, the arrows on includes and extends are in reverse positions . Has anyone given any thought as to why that is ??

   

  Speak soon

   

  Kevork Krozian

  Edulists Creator Administrator

  www.edulists.com.au

  tel: 0419 356 034

   



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