Section 5(4) in The Assam Economic and Statistical Service Rules, 1973
(4)Senior Research Officer/Deputy Director of Economics and Statistics-Category IV: Appointment shall be made by promotion from the select list prepared for this purpose from amongst eligible officers of Category V who have rendered not less than 5 years of service in Category V or a total of less than fifteen years of service in the service on the first day of the year in which the selection for promotion is made.
