In this system available figures of the Census are compared to calculate gender ratio, the elector–population ratio and the status of registration of voters in different age brackets. This has become a standard tool for checking the health of the electoral rolls. Similarly, door to door verification, linking with data from birth and death registers, appointing a Booth Level Officer (BLO) who is familiar with the local populace and situation are some of the interventions for maintaining the integrity of the rolls.
