The Adani Group's data-collection survey in Mumbai's Dharavi that is set to start next week will involve collection of biometric details, videography and documents of proof will be verified and returned to the people, a top official said. "The entire system will be electronic to make it foolproof," SVR Srinivas, chief executive officer of the Dharavi Redevelopment Project Pvt., said. The survey is being done to determine the rehabilitation eligibility criteria under the redevelopment project.