[Year 12 SofDev] Resource flows in a DFD

[Kevin Feely]

Hi mark,
In all of the exercises i have done with context diagrams (level 0) and 
DFD's (mainly level 1 and only discussion about level 2) i have always 
said only data (information) should be represented. That the DFD is not 
concerned with the actual goods ordered or purchased for example, but 
the information these transactions generate.
I suppose this is because we are modeling information systems using the 
DFD tool.
I suppose it is possible to model physical systems with the DFD as well 
( obviously from your link!) but  iam not sure they should be intertwined.
That is if a student represents a physical transaction on my information 
DFD i would regard that as an error.
regards
Kev

Mark Kelly wrote:
> I can't remember seeing a resource flow in an SD DFD, but apparently 
> they exist (e.g. 
> http://www.getahead-direct.com/gwba03-context-diagram.htm)
>
> Are they deliberately avoided in SD or are they not industry-standard?
>
> Cheers
> Mark
>

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