RE: Why Creating DFDs Is Very Dangerous

Subject: RE: Why Creating DFDs Is Very Dangerous
From: Tony Markos <ajmarkos -at- yahoo -dot- com>
To: "TECHWR-L" <techwr-l -at- lists -dot- techwr-l -dot- com>
Date: Fri, 29 Oct 2004 10:45:44 -0700 (PDT)

--- Bonnie Granat <bgranat -at- granatedit -dot- com> asks:

What is the input used to create a DFD and how does
it differ from that of other task-analysis methods?
In other words, from what source does one create a
DFD if not "...we first draw boxes, or ovals, or stick
men, or whatever to represent whatever tasks
(functions) that happen to pop into our mind at the
moment. And then we try to connect them together."?

Tony Markos responds:

Bonnie, your a little unclear, but I will answer what
I think you are asking.

The first flows of data that we draw on a DFD
originate from tasks (functions) outside of the
boundary of the system (i.e., outside of the scope of
our analysis). These outside-of-the-scope tasks are
called sinks.

As these flows then enter the system (manual system,
automated system, or combo thereof), we follow them as
they naturally split and combine together to identify
manual or automated tasks. Yourdon refers to this
process as "interviewing the data".

Bonnie, as I explained in my previous post, there is a
world of difference in the quality of analysis in
"interviewing the data" vs that of a

Tony Markos

Do you Yahoo!?
Yahoo! Mail Address AutoComplete - You start. We finish.


ROBOHELP X5: Featuring Word 2003 support, Content Management, Multi-Author
support, PDF and XML support and much more!

WEBWORKS FINALDRAFT: New! Document review system for Word and FrameMaker
authors. Automatic browser-based drafts with unlimited reviewers. Full
online discussions -- no Web server needed!

You are currently subscribed to techwr-l as:
archiver -at- techwr-l -dot- com
To unsubscribe send a blank email to leave-techwr-l-obscured -at- lists -dot- techwr-l -dot- com
Send administrative questions to lisa -at- techwr-l -dot- com -dot- Visit for more resources and info.

Previous by Author: Re: Data Flow Diagrams
Next by Author: RE: Example of a good DFD
Previous by Thread: RE: Why Creating DFDs Is Very Dangerous
Next by Thread: The Unique Benefits Of Data Flow Diagrams For Task Analysis

What this post helpful? Share it with friends and colleagues:

Sponsored Ads