All companies are in search of extraordinary leaders. Jack Zenger, the co-founder of Zenger Miller and Vice Chairman of Provant, shows readers how to turn managers into leaders, and good leaders into great ones. Based on the findings from more than 200,000 assessments from 20,000 managers from North America and Europe, the authors have identified the key competencies to effective leadership. Their research, which may surprise most managers, reveals that the key to effective leadership does not lie in correcting weaknesses (such as the ones revealed in 360-degree surveys), but focuses on core strengths.