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dfd0 is a bigger scope in less detail than dfd1 which is much more detailed
bhoosde ke ans to de
difference between physical and logical data flow diagrams.
Top down Program Design : Begins the design with main or top-level module, and progresses downwards to the lowest level modules or subsystem Bottom down Program Design : Begins the design with the lowest level modules or subsystems, and progresses upward to the main program, module or subsystem.
"Face" means any/every flat surface that the solid has. "Base" is the face that it happens to be resting on right now. But if you want to, you can pick it up, turn it, and set it down on a different face. So the 'base' and 'top' can change, but they're all faces.