Sia Works for a Book Printing Service

Sia works for a book printing service. Employees often hit the emergency stop button on the new piece of machinery. When this happens an extremely loud alarm sounds. Sia has noticed that other employees have started to ignore the alarm because it sounds several times a shift due to the operators mistaking the stop emergency stop button for the "hold" button that temporarily pauses the machine. Sis is afraid that employees will ignore the alarm when an emergency is happening. She investigates and notices the hold and emergency stop button are both red, suggesting that the operating panel does not exhibit the characteristic of interpretability.