What are the 3 main types of organisational structures?

Simple structure, Functional structure, Divisional structure A functional organization is a common type of organizational structure in which the organization is divided into smaller groups based on specialized functional areas, such as IT, finance, or marketing The divisional structure is a type of organizational structure that groups each organizational function into a division. A simple structure is defined as a design with low departmentalization, wide spans of control, centralized authority, and little formalization