This letter / 01
The next user needs the right material in the right condition
A panel can leave one process satisfactorily and reach the next in a different condition. The operating account needs to include the interval, not only the machine result.
The panel had a satisfactory production record. Before the next operation, it failed the applicable bow criterion. Eighteen of eighty-four panels in the defined stored group had that result. The apparent contradiction was useful because it forced us to ask what the production record actually described. It was evidence about an earlier point in the sequence. It did not establish that the item would remain in the same condition through every period of waiting and handling. I wanted our operating discussion to follow the material across that interval rather than defend the first check as if it answered the later question.
