Management according to the definition of Experts

Any person, firm, even to any country requires Management. Ask why?? What is the definition of management? If you want to know read the explanation below wrote.
Definition of Management according to the experts:

1. According to Dr. SP. Siagian in the book "PHILOSOPHY OF ADMINISTRATION" MANAGEMENT CAN BE DEFINED AS "SKILL OR ABILITY TO OBTAIN A RESULT OF GOAL ACHIEVEMENT THROUGH IN ORDER TO OTHERS".
WITH SO ANYWAY CAN SAY IS THAT MANAGEMENT IS KEY BECAUSE THAN ADMINISTRATIVE MANAGEMENT TOOLS ARE IMPLEMENTING MAJOR THAN administration "
2. According to Prof. Dr. H. ARIFIN Abdulrachman in the book "PRINCIPLES OF MANAGEMENT FRAMEWORK" can be defined:
a. Activities / Activity;
b. PROCESS, is a series ACTIVITY IN SEQUENCE-SEQUENCE;
c. Institute / PEOPLE - PEOPLE WHO DO THE PROCESS ACTIVITY OR ACTIVITIES
3. According to Ordway TEAD adapted by DRS. HE. Rosyidi in the book "ORGANIZATION AND MANAGEMENT", the definition of management is "PROCESS AND BUSINESS ACTIVITIES OF THE LEADING AND DIRECTION OF THE IMPLEMENTATION OF TASK shows IN MAKING AN ORGANIZATION THAT HAS BEEN SET GOALS".
4. According to "Mary Parker Follett":
"MANAGEMENT AS AN ART IN COMPLETING THE WORK BY OTHERS".
5. According to James A.F. Stonner:
"MANAGEMENT IS THE PROCESS OF PLANNING, ORGANIZING, AND SUPERVISION DIRECTION OF BUSINESS-BUSINESS ORGANIZATION AND MEMBERS OF THE USE OF RESOURCES ORGANIZATIONS OTHER ORGANIZATIONS IN ORDER TO ACHIEVE THE GOALS SET".
SO we can conclude ACTIVITY MANAGEMENT PROCESS IS THROUGH WITH OTHERS TO ACHIEVE A PARTICULAR PURPOSE AND EXECUTED sequentially WALK WAY TO PURPOSE.

Here is a MANAGEMENT FUNCTIONS by the Experts:
1. According to George R. Terry
- Planning (Planning);
- Organizing (Organizing);
- Mobilization (Actuating);
- Control (Controlling).
2. According to Luther M. Adapted by Dr. Gulick. BN.Silalai
- Planning (Planning);
- Organising (Organizing);
- Completes Labor (Staffing);
- Directing (Directing);
- Menyelaras / Coordinating (Coordinating);
- Reporting (Reporting);
- Develop Budget (Budgeting).
3. According to Henry Fayol
- Planning (Planning);
- Organising (Organizing);
- Ruling (Commanding);
- To co-ordinate (Coordinating);
- Monitor (Controlling).
4. According to Koontz and O. Donnel
- Planning (Planning);
- Organising (Organizing);
- Completes Labor (Staffing);
- Directing (Directing);
- Monitor (Controlling).