This document discusses poverty estimation in India. It outlines how poverty lines are defined based on a threshold income and how poverty is measured using consumer expenditure surveys. It provides a timeline of poverty line estimates in India since the 1970s established by various committees. The Lakdawala, Tendulkar, and Rangarajan Committees each proposed different methods and criteria for estimating poverty lines and calculating poverty ratios. The estimates of poverty levels in India have varied over time and across the rural-urban and state levels based on the different methodologies used.