The advantages of DFD

Answer 1

When it comes to conveying how information data flows through systems (and how that data is transformed in the process), data flow diagrams (DFDs) are the method of choice over technical descriptions for three principal reasons.

1. DFDs are easier to understand by technical and nontechnical audiences

2. DFDs can provide a high level system overview, complete with boundaries and connections to other systems

3. DFDs can provide a detailed representation of system components.

DFDs help system designers and others during initial analysis stages visualize a current system or one that may be necessary to meet new requirements. Systems analysts prefer working with DFDs, particularly when they require a clear understanding of the boundary between existing systems and postulated systems.

As we have seen, the DFD method is an element of object-oriented analysis and is widely used. Use of DFDs promotes quick and relatively easy project code development. DFDs are easy to learn with their few-and simple-to-understand symbols (once you decide on a particular DFD model). The syntax used for designing DFDs is simple, employing English nouns or noun-adjective-verb constructs.

http://www.stc.org/confproceed/2000/PDFs/00098.pdf