Controls

The public well in Qingshi Town supplied water to half the town every day. In the past, only one sign hung by the well: Be careful not to fall in; do not use dirty buckets. Everyone nodded, yet some still slipped in the dark at night, some put fish-washing buckets into the well, and once the well rope frayed and broke, sending the bucket to the bottom.

The mayor punished a few people first. The day after the punishment, children were still leaning over the well edge watching the water, and the well rope was still fraying. The old carpenter said you cannot protect the well by reminders; you have to stop the danger within the action. Punishment only expresses dissatisfaction after the fact; it cannot stop the next dirty bucket.

He first added a nighttime wooden grate at the well mouth, which automatically locked after sunset to prevent people from approaching in the dark; then he made a public bucket hook, so that only clean public buckets could go down the well, while private buckets could not fit; finally, he nailed a marked board beside the well rope, and every day those drawing water had to see which mark the wear had reached, and replace it once it passed the red line.

A few weeks later, the wooden fence stopped a drunk man; the hook caught the fishmonger's dirty bucket; the notch board got the well rope replaced before it broke. Only then did the mayor see that the three things were not the same kind of control: some prevented in advance, some detected in time, and some helped correct.

The first repair still missed one spot. When the rainy season came, the muddy ground by the well became slippery, and the wooden fence, hooks, and marked boards had not addressed what was underfoot. The old carpenter then laid coarse stones, dug drainage ditches, and designated someone to clean up after the morning market. Controls must grow with new risks; they cannot be installed once and then left to sleep.

Afterward, notices were still posted by the well, but no one treated the notice as the only safeguard. Each time a new risk appeared, the town asked: can we block it first, and if we can't block it, can we detect it early, and once detected, who corrects it?

The public well became safe not because people suddenly became cautious, but because danger was caught by concrete railings, hooks, signs, and responsibilities. Real control measures must land in on-site actions.

Later, when a neighboring town came to borrow the notice template, the old carpenter gave only half a sheet of paper, on which was written: first find the dangerous action, then decide the railing, hook, sign, and responsible person. If you only paste the four words "please be careful" in larger letters, the well is still that well, and the rope is still that rope about to break. Later, when the town repaired bridges, opened granaries, and held lantern festivals, it also continued to use this set of questions.