Decentralisation means dispersal of authority among the lower levels of the administrative systems. The process of transfer of administrative authority from a lower to a higher level of government is called centralization 'the converse, decentralisation'. In a centralized system of administration, the lower levels can not act on their own initiative, they have to refer most of their problems to the higher level for decision making. They act as only implementing agencies. In a decentralized system of administration, on the other hand, the field officers can act on their own initiative in specified matters. They are given authority to take decisions without reference to the headquarters. Thus, the essence of decentralization is the vesting of decision making power in the field offices. Types of decentralization: