Which KPI provides the most direct insight into the effectiveness of a retail staff training program?

Sales conversion rate per staff member provides the most direct insight into the effectiveness of a retail staff training program. Sales conversion rate measures the percentage of customer interactions that result in a purchase. Tracking this metric before and after the training program allows for a direct comparison of staff performance. For example, if the sales conversion rate per staff member increases significantly after the training, it indicates that the training program has successfully equipped the staff with the skills and knowledge to close more sales. While other KPIs like customer satisfaction scores, average transaction value, and employee product knowledge test scores are valuable, sales conversion rate is the most direct measure of how effectively the training program has translated into improved sales performance.