What is the work of the chief executive? What does he do? - Luther Halsey Gulick

It is appropriate at the outset of this discussion to consider the reasons for and the effect of the division of work. It is sufficient for our purpose to note the following factors.

The power of an idea to serve as the foundation of co-ordination is so great that one may observe many examples of co-ordination even in the absence of any single leader or of any framework of authority.

[POSDCORB as]... statement of the work of a chief executive is adapted from the functional analysis elaborated by Henri Fayol in his "Industrial and General Administration." It is believed that those who know administration intimately will find in this analysis a valid and helpful pattern, into which can be fitted each of the major activities and duties of any chief executive.