Easy-to-process things feel truer, safer, and more appealing.
More quotesThe clever part of pink ceiling paint is timing. The colour appears while correction is cheap and disappears after it has done its job.
Many systems reverse that order. A railway door gives no sign that the button press registered, so three people press again. A card reader waits in silence, then reports failure after the customer has put the card away. A freezer alarm announces the temperature problem hours after the food has thawed. The information may be accurate and practically useless.
Ask when a person can still act. Feedback before that point can guide; feedback afterwards mostly documents regret. It should also answer the immediate question: did the action register, what is happening, which part failed and what can be corrected?
Quantity is a poor substitute. Five colours, three vibrations and constant alerts force people to interpret the warning system while dealing with the thing itself. Match strength to consequence and keep the signal distinct enough to recognise under pressure.
The next ceiling strip goes on pink. The painter sees a missed patch beside the light fitting and covers it before climbing down. Later the whole surface dries white. No report is produced about the corrected patch, because the useful information vanished at exactly the right time.