With the growth of the size of business units it becomes necessary to departmentalize activities. Departmentation of office activities is encouraged because it leads to specialisation, fixation of responsibility and ensure greater efficiency. When the typing work of various departments are undertaken within one department, it is called typing pool.

Centralisation of typing work is termed as typing pool. Centralisation of typing work avoid duplication of typing work, brings about saving in cost, facilitates gradation of the employees and relieves the work of other departments. On the other hand, when the typing work of various departments is performed at their departmental level, it is called departmental typing.