An objective in the supermarket checkout system is to calculate the correct total. One risk that decreases satisfaction is the calculation with prices that differ from those marked at the shelves. Possible consequences of this risk are

• the supermarket loses money
• customers are dissatisfied
• supermarket employees have to invest work in receiving the customer complaint

Which risk reduction tactic would be the most likely to produce the countermeasure

"Prices must not change during shop hours, on-shelf price displays are electronic and connected to supermarket system displaying same price as cash register uses for calculations."