Either an executive can do his job or he can't.
If you are attempting the impossible, you will fail.
Managers are to information as alcoholics are to booze. They consume enormous amounts, constantly crave more, but have great difficulty in digesting their existing intake.
If sophisticated calculations are needed to justify an action, don't do it.
Effective management always means asking the right question.
In getting good results team leaders become conductor rather than driver, enabling others to play the right music, not by hands-on domination of all decisions and execution, but by providing inspiration, motivation and stimulus.