Section 5(3) in The Assam Economic and Statistical Service Rules, 1973
(3)Joint Director of Economics and Statistics-Category III: Appointment shall be made by promotion from the select list prepared for this purpose from amongst eligible offices of Category IV who have rendered not less than 5 years of service in Category IV or a total of not less than eighteen years of service in the service on the first day of the year in which the selection for promotion is made.
