It is this detachment, this use of comparison, his faith in the possibility of applying scientific processes of thought to the organisation of indust… - Lyndall Fownes Urwick

No superior can supervise directly the work of more than five or, at the most, six subordinates whose work interlocks. The reason for this is simple. What is supervised is not only the individuals, but the permutations and combinations of the relationships between them. And while the former increase in arithmetical progression with the addition of each fresh subordinate, the latter increase by geometrical progression. If a superior adds a sixth to five immediate subordinates he Increases his opportunity of delegation by 20 per cent, but he adds over 100 per cent to the number of relationships he has to take into account. Because ultimately it is based on the limitations imposed by the human span of attention, this principle is called The Span of Control.

The concept of management as a specific body of knowledge and practice forming the basis of a specialised profession ... Wherever human activities are carried out in an organised and co-operative form, there management must be found.

Before Mary Follett, industrial groups had seldom been the subject of study of political or social scientists. It was her special merit to turn from the traditional subjects of study - the state or the community as a whole - progressively to concentrate on the study of industry... Her approach was to analyse the nature of the consent on which any democratic group is based by examining the psychological factors underlying it. This consent, she suggested, is not static but a continuous process, generating new and living group ideas through the interpenetration of individual ideas.