How do senior leaders, in their own words, describe the most effective leaders—the ones that get results, grow the business, enhance the culture, and leave in their wake a trail of other really effective leaders?

After surveying more than one million leaders worldwide, co-authors Robert (Bob) J. Anderson and William (Bill) A. Adams have drawn on their research to define leadership that works, that does not, that scales, and that limits scale, in their book SCALING LEADERSHIP: Building Organizational Capability and Capacity to Create Outcomes that Matter Most (Wiley; hardcover; January 29, 2019).

Below, Anderson and Adams answer questions about effective leadership.