India has traditionally been setting poverty lines (and welfare payments) based on consumption data, while the SECC presents a much more detailed household level data. The Rangarajan expert group recommends that the SECC data and population census be used for determining entitlements, and poverty ratios be merely used for determining allocations between states. Leading development economist Jean Drèze adds an additional cautionary note: "We should beware of any illusion that SECC data can be used for the purpose of drawing a line between poor and non-poor households. There are fundamental, conceptual and practical difficulties with doing that on the basis of proxy indicators, even with good-quality data.