Visiting the US, Ohno saw how Piggly Wiggly supermarkets worked: customers took what they needed, and the shelf was replenished only when a certain quantity was taken. He flipped this for manufacturing. Instead of pushing parts from the previous process, the subsequent process would pull what it needed.
This is the core of most search queries for Taiichi Ohno, a production engineer, takes Kiichiro’s concepts and Sakichi’s Jidoka and synthesizes them into the Toyota Production System (TPS) . the evolution of a manufacturing system at toyota pdf