Who's really in charge of white-collar Australia? Of the thousands of men and women who sit in boardrooms, who are the 10 most powerful corporate and not-for-profit directors?

Ranking them -- as The Power Index begins today -- is no easy task. How do you begin to assess internal boardroom dynamics, let alone order a list of names? Should a powerful director be able to force change inside one firm, across a number of different organisations, or broadly as a public actor? Should directors of private companies be included?