Ringer transcended the typical businessperson's club luncheon speech. He delivered a concise, clear, and relevant presentation that made it easy to see how leadership is superior to supervision. He was a familiar and approachable person who practiced the principles that made Jack Welch famous. Employee selection is a basic requirement for business success. Good supervisors select employees by going through the application, asking approved questions, and hiring those with the best scores.
Good managers do all of that plus ask about behavior that indicates ability to do the job well.
Both of these are perfectly valid approaches to selecting employees. They have worked well for nearly a century. However, the manager gains definite advantages by finding past behaviors that support current needs. When all is said and done, the best predictor of what a person will do is what they did before. Likewise, people who learned to avoid repeating a mistake are less likely to even make similar mistakes in the future.