This is a very vague question, but through this I think Planning
is the most efficient and important. There are multiple different aspects and multiple different functions that are equally as important. Referring to Luther Gullick who gave us ‘POSDCORB’ which stands for
Planning (P)
Organizing (O)
Staffing (S)
Directing (D)
Controlling (CO)
Reporting (R) and
Budgeting(B)
Reasoning:
Planning takes place at many levels and in a variety of ways in any company. A manager at the top of the organization, such as the manager of a manufacturing facility, organizes for events differently from a manager who is in charge of, say, a team of employees who are in charge of assembling modular homes on an assembly line. The assembly-line manager or supervisor is only in charge of the line under his or her supervision, whereas the plant manager must be concerned with the overall operations of the factory.
The different types of planning that is typically used is Strategic planning, Short-range or tactical planning, and Contingency planning.
Hope this helped!