James Kouzes and Barry Posner are not the only leaders who model the way things should be done. But when we spoke recently, that’s just what they did. Though I was doing the interviewing, they asked me multiple questions, listened, and contributed rich illustrations. It was truly an Exchange, and the valuable results follow. Kouzes and Posner teach at the Leavey School of Business at Santa Clara University. They’ve written many books, but are perhaps best known for The Leadership Challenge, which was first published 25 years ago and will be out with a fifth edition this summer. With its dramatic case studies, the influential book has sold more than 2 million copies in 22 different languages.