[prog] Data flow diagrams(DFD)

[E V]

 --- Jenn Vesperman <jenn at anthill.echidna.id.au>
wrote: > On Tue, 2003-06-24 at 10:13, Sachin wrote:
> > Dear ladies and gentlemen,
> > 
> >                                     What is the
> correct way to draw a DFD
> > for a project?Each book has a  different
> terminology,have in differences in
> > notations and symbols and none of them mentions a
> standard proceedure on how
> > to draw a DFD from a System Design.Is it a free
> style drawing(meaning it
> > depends on individuals preferences) or should
> conform to some standards?
> 
> It depends on the purpose you're putting it to. If
> you're going to be
> publishing it in an academic context, you should
> probably find a
> standard (preferably from some suitably academic
> source) and stick to
> it.
> 
> If you're doing it to do a design for a programming
> company or
> organisation, you should find out if there's an
> in-house standard, and
> stick to that.
> If there isn't and your company/organisation likes
> to use standards, you
> should grab a few standards you think would be
> generally useful within
> your company, make up some pros and cons, and talk
> to the head of IT
> asking him to pick a standard and offering your
> preference. 
> 
> If you're doing it for yourself and a small team,
> use what works for
> you.


There are not many ways to draw DFD. Most book would
basically show you the same thing. To draw DFD you
should be familiar with its four components: process,
data store, source/ sink and data flow.

However DFD has different stages (0 Lovel, context
level etc.) and also different types (current logical,
current physical, new logical and new physical)..

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