“Concentration on a few but essential things“ is one of the principles of effective management. Effectiveness requires focus: nobody can be successful on a number of different fields at the same time. Concentration is therefore the key to achieving results. This principle is especially important for executives, because no other occupation is in greater and more systematic danger of having its resources and activities dispersed over many different tasks and assignments, which makes it impossible to achieve results. By concentrating on a few but essential things true professionalism comes to light.