" There is no rule that says ‘A chief executive has to be in charge of this or that.’ Of course a chief executive is the court of last resort and has ultimate accountability. And the chief executive also has to make sure of getting the information necessary to discharge this ultimate accountability. The chief executive’s own work, however, depends on what the enterprise requires and on who the individual is. As long as the CEO’s work programme consists of key activities, he or she does a CEO’s job. But the CEO also is responsible for making sure that all the other key activities are adequately covered. "

― Peter F. Drucker , Innovation and Entrepreneurship: Practice and Principles