If these seven elements may be accepted as the major duties of the chief executive, it follows that they may be separately organized as subdivisions of the executive. The need for such subdivision of the executive. The need for such subdivision depends entirely on the size and complexity of the enterprise. In the largest enterprises, particularly where the chief executive is as a matter of fact unable to do the work that is thrown upon him, it may be presumed that one or more parts of POSDCORB should be suborganized.