1. First, record the total sales amount completed by the cashier in a certain period of time, including cash, credit card, vouchers and other payment methods.

2. Secondly, the cashier's error amount (if any) in bookkeeping and change is calculated, and then the cashier's error rate is obtained by dividing the error amount by the total sales.

3. Finally, the cashier's performance is comprehensively evaluated by combining the cashier's error rate, customer service level, transaction speed and other factors, and the performance appraisal is conducted on this basis.