Uwashinze Toyota Production System, "sekuruza w’imicungire y’umusaruro", Bwana Seiichi Tokinaga, umunyeshuri wa Naiichi Ohno, yahawe akazi kihariye kugira ngo ashyire mu bikorwa uburyo bwo kubyaza umusaruro TPS. Fungura igihe cy’umusaruro unanutse mu buryo bwose.