Decentralization also called departmentalization is the policy of delegating decision-making authority down to the lower levels in an organization, relatively away from and lower in a central authority. A decentralized organization shows fewer tiers in the organizational structure, wider span of control, and a bottom-to-top flow of decision-making and flow of ideas.

In a centralized organization, the decisions are made by top executives or on the basis of pre-set policies. These decisions or policies are then enforced through several tiers of the organization after gradually broadening the span of control until it reaches the bottom tier.

In a more decentralized organization, the top executives delegate much of their decision-making authority to lower tiers of the organizational structure. As a correlation, the organization is likely to run on less rigid policies and wider spans of control among each officer of the organization. The wider spans of control also reduces the number of tiers within the organization, giving its structure a flat appearance. One advantage of this structure, if the correct controls are in place, will be the bottom-to-top flow of information, allowing decisions by officials of the organization to be well informed about lower tier operations. For example, if an experienced technician at the lowest tier of an organization knows how to increase the efficiency of the production, the bottom-to-top flow of information can allow this knowledge to pass up to the executive officers.