Summary, Analysis & Review of James Kouzes's & Barry Posner's The Leadership Challenge by Instaread Preview: The Leadership Challenge by James Kouzes and Barry Posner takes a close look at the factors that contribute to strong leadership in a variety of fields. In their research, Kouzes and Posner found that there are five practices that leaders commonly list as key to moments when they were effective leaders. Central to every leader's success is credibility, which is related to the characterist