This is a pictorial of a pull signal system using electronic signals to communicate.
Remember, we want to compress value-added areas, reducing lead time which will increase throughput and reduce cost.
Here we have three types of material that is located in a material staging area, away from the assembly point. At the assembly point we have only enough material on hand to meet needs for a short period of time (e.g.. Two hours) - may be two containers.
The process involves minimum intervention and schedules based on need.