A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system, modeling its process aspects. DFDs can also be used for the visualization of data processing (structured design).

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Do context diagrams have levels?

I heard that the context analysis diagram has different levels. I couldn't find this in .Net, but I have seen that a DFD has different levels. Do context diagrams have any levels (level0, level1, ...
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Data Flow Diagrams - Difference between Lines and Arrows

I'm currently working with Visio to create Data Flow Diagrams for a System Analysis and Design class but I'm unsure what the difference between ------ and ------> is. I can connect 2 shapes ...