A fridge doesn’t suddenly jump from 4 °C to 12 °C. It creeps: 4.2 → 4.8 → 5.6 → 7.1 over ten days while someone keeps writing “OK” on paper.

Digital logs show the graph. You see the upward trend on day four and book the engineer before disaster strikes.

We’ve watched cafés save thousands of pounds of stock and avoid improvement notices just because the graph went orange and they acted the same day.

Paper hides problems. Graphs shout them at you.