The caste-based socio-economic census will help governments launch programmes beneficial to communities which have remained backward, said Additional Deputy Commissioner H.N. Gopala Krishna here on Saturday. Inaugurating a training session for government staff to be involved in census, he said, courts were often asking governments to substantiate the need for reservation with facts to show socio-economic status of castes. The government decided to find an answer to this through caste-based census, he said.