Fable
The mill lets each sack of grain's echo drive the next turn of the wheel
The valley mill originally relied only on the old master to adjust the millstone. If the grain was too coarse or too fine, customers just complained a bit at the counter, and the master adjusted the next batch from memory.
As the business grew, problems became scattered: which grain often clogged the mill, which craftsman's water flow was steadiest, which type of customer always returned goods—no one could say for sure.
The workshop owner first had everyone write daily reports. The notebooks piled up thicker and thicker, and by month's end the paperwork could be submitted, but it did not feed into recipes, training, or quality inspection. Bad grain was still handled the old way, and good experience stayed in individual heads.
The new mill owner brought records into daily work. The source of each sack of grain, the water volume, the stone spacing, the reason for rework, and customer feedback all had to return to the preparations before the next milling.
Bad samples picked out by quality inspection become apprentice exercises, successful customer orders become commonly used recipes, and grain sources that repeatedly make errors are marked separately. The busier the mill, the more experience is left behind; the more experience, the more stable the next round.
The workshop owner also held the boundary. Without rights, quality, and retrospectives, records only become paper ash in a warehouse. The real turning wheel is that every delivery pushes the next one to make one less mistake.
Half a year later, the mill encountered a batch of damp grain. The old master could save part of it by experience, but the new apprentice did not know where to begin. The new mill owner dug out past records and found that this problem often occurred after rain on the same hillside, and that rework methods had already been tried by someone before.
This time, the experience did not stay in the hands of one master, but flowed back through the records to procurement, drying and quality inspection. The more customers used it, the better the mill knew where to improve; the more accurately the mill improved, the more willing customers were to keep sending their grain. Later, when newcomers started, the old masters no longer began with abstract categories, but had them review that failure: where intuition had been relied on before, why the first fix was not enough, and how the new arrangement kept risk in a place that could be checked. Only when they could explain these details clearly, and also point out when to keep using the approach and when to escalate, were they considered to truly understand this method. Later they also had newcomers rehearse with this method: first have the newcomer do it the old way and see how errors arise; then redo it under the new rules and see which step was blocked in advance and which step left evidence. If a newcomer could only recite the names, they would still misuse it in similar scenarios; only those who could state the applicable boundaries, the costs and the remedies after failure were allowed to take on work independently.