Deputation is the appointment of a Government servant, by transfer and on a temporary basis, to a post outside their normal line of work (an “ex-cadre post”), in the public interest. The employee continues to belong to their parent cadre and returns to it at the end of the assignment.
Three conditions must all be satisfied for an appointment to count as deputation or foreign service: the appointment is made by transfer, it is temporary, and the post is outside the employee’s normal field of deployment and in the public interest. The authority that controls the post from which the employee is transferred decides whether a transfer is outside the normal field of deployment.