If there is any one secret of effectiveness, it is concentration. Effective executives do first things first and they do one thing at a time.
Peter DruckerChecking the results of a decision against its expectations shows executives what their strengths are, where they need to improve, and where they lack knowledge or information.
Peter DruckerThe leader of the past was a person who knew how to tell. The leader of the future will be a person who knows how to ask.
Peter Drucker