Every three or four years I pick a new subject. It may be Japanese art; it may be economics. Three years of study are by no means enough to master a subject but they are enough to understand it. SO for more than 60 years I have kept studying one subject at a time.
Peter DruckerIf a business is to be considered a continuous process, instead of a series of disjointed stop-and-go events, then the economic universe in which a business operates-and all the major events within it-must have rhyme, rhythm, or reason.
Peter DruckerThere's nothing so useless than executing a task efficiently when it actually never should have been executed at all.
Peter Drucker