Civil Service Personnel Rule 21
Selection and Appointment of Professional Staff
21. (a) When external persons are to be selected and appointed to the vacant posts of professional staff grade (1), it shall be done with the procedures mentioned in the sub-rule (a) of rule 19.
(b) When external persons are to be selected and appointed to the vacant posts of professional staff grade (3), it shall be done with the procedures mentioned in the sub-rule (d) of rule 20.
(c) The appointments to the posts of other levels shall be done only by the promotion process. However, the promotion to the gazetted officer level, professional staff grade (4), shall be done in coordination with the Union Civil Service Board.