Pune-based NGO, Mashal, is to conduct GIS-based biometric socio-economic survey in Dharavi, for the first time. Based on natural and topographical divisions, Dharavi has been divided into 12 segments. Around 25 teams are being deployed to carry out the survey. Officials say it is important to conduct a biometric survey and fingerprints of slum dwellers scientifically stored so that ineligible persons do not lay claim to free flats. Media reports say the Dharavi Rehabilitation Project may fine-tune the survey to image retinas so that there is no scope for bogus allotments and resales.