: Sources or destinations outside the system boundaries.
To manage complexity, DFDs are organized into levels of increasing detail:
: A high-level overview showing the entire system as a single process interacting with external entities. dfd.rar
: Breaks down the context diagram into major subprocesses, revealing more of the system's internal workings.
: Repositories where data is held for later use, such as databases or files. : Sources or destinations outside the system boundaries
: The pipelines (usually arrows) showing the path data takes between components. Hierarchical Levels of DFDs
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 : : Repositories where data is held for later
: Decomposes processes further until the logic can be explained simply (e.g., through pseudo-code). File Specifics and Usage How to create a Level-0 Data Flow Diagram (DFD)