More brilliance in "Training and the Infinite Return on Investment":
"Consider an employee who is going to work 2000 hours for you this year. It's not unusual for an organization to spend only 10 or 20 hours training this person--which means about 1% of their annual workload. How much training would it take for this person to be 10% better at her job? If you invest 100 hours (!) it'll pay for itself in just six months. There aren't many investments an organization can make that double in value in a year."