The principles of management are intended to apply to all types of organisations, business as well as non-business, small as well large, public sector as well as private sector, manufacturing as well as the services sectors. However, the extent of their applicability would vary with the nature of the organisation, business activity, scale of operations and the like. For example, for greater productivity, work should be divided into small tasks and each employee should be trained to perform his/her specialised job. This principle is applicable to a government office where there is a diary/despatch clerk whose job is to receive and send mail or documents, a data entry operator whose task is to input data on the computer, a peon and an officer etc.
It is important as it helps manager in taking thoughtful and scientific decisions.
As it is not rigid and can be modified by manager as per the situation.
As it depends upon the prevailing situation at a particular point of time.