Everyone can make the wrong decision — in fact, everyone will sometimes make a wrong decision. But no one needs to make a decision which, on its face… - Peter Drucker

As a rule, theory does not precede practice. Its role is to structure and codify already proven practice. Its role is to convert the isolated and “atypical” from exception to “rule” and “system,” and therefore into something that can be learned and taught and, above all, into something that can be generally applied.

…control has to be by feedback from the work done. The work itself has to provide the information. If it has to be checked all the time, there is no control

That one can truly manage other people is by no means adequately proven. But one can always manage oneself.