We frequently test new survey questions ahead of time through qualitative research methods such as focus groups, cognitive interviews, pretesting (often using an online, opt-in sample), or a ...

It is important to re-emphasise the point that all the surveys listed do adopt scientific sample designs. This is widely acknowledged, even at the international level. However, there can be no ...

has been conducting large-scale sample surveys on All-India basis since the 1950s. These surveys are the most important and reliable sources of data on several subjects including employment ...