Disadvantages of departmentalization include slower decision making, the development of managers and workers with narrow experience and expertise, and makes it more difficult for cross-departmental coordination.

Functional departmentalization

Explanation: Functional departmentalization is the process in which the departments of an organization is splitted on the basis of function they perform for that particular organization. Example :-Finance department, Human resource department etc.

The drawback of functional departmentalization are coordination becomes complex across the department , process of decision making is slow,face territorial conflicts, etc.

experiments.

surveys.

questionnaires.

interviews.

case studies.

participant and non-participant observation.

observational trials.

studies using the delphi method.

i dont know but thats a great qusestion