A data flow diagram graphically displays the process of moving, changing,
or updating information.
If you haven't already done so, first
download the
free trial version of RFFlow. It will allow you to open any chart and make
modifications.
Once RFFlow is installed, you can open the above chart in RFFlow by clicking
on
Data_Flow.flo.
From there you can zoom in, edit, and print this sample chart. It is often
easier to modify an existing chart than to draw it from scratch.
To draw this chart without downloading it, run RFFlow and click on the More
Shapes
button. Scroll to the
Software Design folder and click the plus sign to open it.
Click the
Yourdon Data Flow stencil and then click the
Add Stencil button.