System analysis and design

Data Flow Diagrams

Select one of the following topics. 

• Logical data flow diagram (DFD)
• Physical DFD
• Comparison of logical and physical DFD
• Summary of system activities that could be used to generate a DFD
• Checking a diagram for errors

Create an example demonstrating your understanding.

Your post will include at least one DFD, created for this post specifically. 

After providing your example, the DFD will be used as a backdrop to explain the topic you chose, as it relates to the diagram.