A company designs a training program for underperforming employees. They enroll in the program the employees who received the worst 10% of performance evaluations in a given year.

A company designs a training program for underperforming employees. They enroll in the program the employees who received the worst 10% of performance evaluations in a given year. They find that very few of the employees who go through the program are in the bottom 10% of performance evaluations the next year. What can they conclude about their new program?