Hatches are needed to show the flow of information. When the flow of information is in the electronic environment, it is modified in the form of lightning.
The time axis is drawn below the process boxes and stock triangles to calculate the duration of the production flow. Production flow time is the duration covering all the movements in the workshop from transport of the raw material to the shipment of the parts to customers. In addition, both the flow time and value adding time for a process can be drawn in Fig. 1.