I would introduce very interesting question and my answer.
I got a question and was required to make a comment about TOC (Theory of Constraint) from my student. He told his point of view regarding the KPI (key performance index) which I described in “the Way of TPS” and said that these KPIs promote “the best in part (Optimum in part)” rather than “the best in entire (Optimum in entire)”. Why? Why this student thinks that KPI promotes “the best in part”? Initially I couldn’t understand the meaning of the student’s opinion. Then when we made the regular TV conference, I confirmed his opinion and could understand his misunderstanding.