Learn how to use data flow diagrams (DFDs) to analyze and design business systems. Discover the benefits, components, and types of DFDs, and how to apply them in your projects.

Data flow diagrams help you visualize and document ... You can use symbols, such as arrows, circles ... A data source is an entity that provides data to the system, such as a database, a ...

The flow chart shown overleaf illustrates the use of the Database Interface routines. Routine DIERR is not included in the diagram. It may generally be used out of sequence within the guidelines ...