01
When a busy factory serves the wrong mix
I examine a fictional small-order trial in which the selected delivery measure improved while local utilisation fell and expense increased. The session follows forty-two reserved machine hours per week over ten weeks, with JPY 24 million additional expense. It keeps the separate hundred-order cohorts and their original promised dates visible instead of treating the comparison as a controlled experiment. Participants consider how a preferred production sequence can systematically postpone work the business has already agreed to serve. The conversation asks what operating provision should accompany a different commercial promise and how leadership should assess the less flattering measure alongside the encouraging one. It does not prescribe a universal batch size, machine allocation or manufacturing method. No live customer schedules are requested. The purpose is a more precise discussion between commercial and production teams about the business they intend to run, using an invented case whose costs, sample boundaries and unresolved wider application remain explicit.