Leadership pervades every aspect of organizational and social life, and its study has never been more diverse, nor more fertile. With contributions from those who have defined that territory, this volume is not only a key point of reference for researchers, students and practitioners, but also...

Leadership theories often include a contingency effect where the relationship between two or more variables is normally theorized to be monotonic, i.e., that it has a generally accepted direction — positive or negative — across the full range of the contingency variable. Most examinations of...