As from the name, DFD is a diagram that reflects the flow of information while the second is a process. That process can be represented by multiple diagrams and tools. In other words, DFD is a tool that is part of data process model.
I have attached a link here with some additional information. Those are both very good at defining the data modeling.
http://www.umsl.edu/~sauterv/analysis/Fall2010Papers/varuni/
Define what a final system requirement document is. What sections does your final system requirement document include? What do you believe are the most important sections, and why? Additionally, who is the audience of your final system requirement document? Are there multiple versions of the document to communicate to different audiences?
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