Sample registration system (SRS) : Was initiated in 1964-65 (on a pilot basis ; Full scale from 1969-70) to provide national as well as state level reliable estimates of feility and Moality SRS is a dual record system Field investigation : Continuous enumeration of bihs and deaths by an enumerator Independent retrospective survey : Every 6 months by an investigator-supervisor Findings of SRS survey Crude bih rate (CBR) : 20.4 per 1000 mid year population Crude Death rate (CDR) : 6. 4 per 1000 mid year population Natural growth rate : 14% Infant Moality rate (IMR) : 34 per 1000 live bihs Ref: Park 23rd edition 904