Action learning is a powerful organizational tool that works like this: A diversified group of four to eight members solve a complex, urgent problem. While seeking innovative solutions to the problem, the group members simultaneously develop their leadership and team skills. Pioneered by Reg Revans in the coal mines of England in the mid-20th century, action learning has recently become the fastest growing leadership methodology in the United States. It's been used by such companies as Wells Fargo, Boeing, and Nationwide Insurance, to name just a few.