In the Census of India, data is enumerated on two basis, 'Place of birth' and 'Place of Residence'. Which of the following is the purpose for the same?

To assess migration

In the Census of India migration is enumerated on two bases : (i) place of birth, if the place of birth is different from the place of enumeration (known as life-time migrant); (ii) place of residence, if the place of last residence is different from the place of enumeration (known as migrant by place of last residence). The purpose of the same is to assess migration.