Breaking a process into its discrete components and diagramming it as a series of small rectangles (processes), arrows (information and material flows), and inverted triangles (storage of goods).
A detailed map of every step in the process, including hidden factory steps.
A diagram which shows the triggering event(s), sequential flow of process steps, decision points, and deliverable or outcome of a single process.
A Process flow diagram (PFD) is a diagram commonly used in chemical and process engineering to indicate the general flow of plant processes and equipment. The PFD displays the relationship between major equipment of a plant facility and does not show minor details such as piping details and designations. Another commonly-used term for a PFD is a flowsheet.