Monica is one of the cashiers at your retail store. She has worked in the store for more than two years but moved to cashier only a month ago. She wants the cashier position, it pays her better, and you need cashiers. However, her till is off unacceptably most of the time, sometimes by as much as $$20.$ After review, you realize this is not an honesty issue, she is not stealing, she is just counting change back incorrectly. You want to help her succeed in the new position. What's the plan?