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The top management is the ultimate source of authority and it manages goals and policies for an enterprise. It devotes more time on planning and coordinating functions.
Middle managers deal with goal setting and department-level decision-making. Middle management is the intermediate management level accountable to top management and responsible for leading lower level managers.
Low level management is line between middle level management and workers. There manages are directly setated to workers. They are also help building image of the enterprise before workers and also help in creating the sense of belongingness among them towards the enterprise.
If you put it in the most simplistic of terms:
Lower Management is the Supervisor/Foreman on the "shop floor". They ensure that the work is actually being done!
Middle Management move the process on further dealing with distribution and the customers.
Upper Management are all about concepts, development and high finance.