Now that your salespeople have received their year-end commission checks, some of them may start looking for new opportunities, writes John Kenney. You can minimize turnover, however, by making better hires to begin with and by using a mentoring program to get representatives up to speed, he writes. You should also use exit interviews to learn from your mistakes. "This is not for every salesperson that leaves. If the person consistently contributed to the top line, their insight is priceless," he writes.