Explain the principle functions of management. Would you attach different levels of importance to these functions at various levels of management?

Explain the principle functions of management. Would you attach different levels of importance to these functions at various levels of management?
Functions of management - General List
Planning - deciding what to do, when to do, how to do, and who has to do it
Organizing- giving Structure and staffing
Directing- motvating and leading
Controlling - setting goals and deadlines and monitoring progress
Functions of Management - an extended list by Luther Gulick
Planning, Organizing, Staffing, Directing, Co-ordinating, Reporting and Budgeting - POSDCORB
In addition above function, Ernest Dale has added the following functions
Innovation- converting an invention into economic value or business model
Representation - representing in various outside agencies

Management function pervades across the enterprise and works at all levels. However the position of an individual within the organization's hierarchy determines the nature and content of his or her managerial position. The lowest level of management is called first-line of management which consists of people such as foreman, sales executives etc. The next level of management is called middle-level management which consists of people such as production managers, process engineers etc. Middle management consists of a great bulk of any organization. The next level of management is called Top-Management which the highest powered group in a given organization. In case of a business top management consists of Board of directors, CEO, President etc.