Flow charts may include different levels of detail as needed, from a high-level overview of an entire system to a detailed diagram of one component process within a larger system.

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 ...

A process flow diagram is often used in training to document an existing process or to evaluate the efficiency of that process.