Bangladesh Bureau of Statistics (BBS) introduced Sample Vital Registration System (SVRS) in 1980 to study the changes in the demographic scenarios of Bangladesh during the intercensal periods. Initially, the coverage was limited to 103 primary sampling units (PSU) each consisting of 250 households. Subsequently, the number of sample PSUs was raised to 210 in 1983 and further to 1000 in 2002. To meet the data requirements of the planners and policymakers, the number of PSUs was increased to 1500 in 2013. An Integrated Multi-Purpose Sample (IMPS) Design, introduced in 2012, is being followed since 2013 SVRS, which is also applicable to the last four rounds of SVRS since 2014. As many as 11 data recording schedules are currently being used to collect data on household and household population characteristics, birth, death, migration, marriage, disability, HIV/AIDS and contraceptive use.