The process of grouping various activities into separate units is called departmentation. Departmentation can be made on the basis of functions or product handled. When the departmentation is done on the basis of functions, it is called functional departmentation. Under this all work of same kind are performed in a particular department. The examples of functional basis departmentation is purchase office, sales office, production department, mailing department and accounts department.
When an organisation opens departments on the basis of products, it is called product departmentation. The examples of product departmentation are leather division office and plastic division.