A DFD represents the logical or physical flow of data from its source to its final destination. It focuses on the of the data movement rather than the how of technical implementation. Core Components :
To manage complexity, DFDs are organized into levels of increasing detail: dfd.rar
: Actions that transform incoming data into outgoing information. A DFD represents the logical or physical flow
: Sources or destinations outside the system boundaries. dfd.rar
: The pipelines (usually arrows) showing the path data takes between components. Hierarchical Levels of DFDs