Understanding Society is a largescale longitudinal survey of approximately 40,000 households across the United Kingdom. As a multi-topic household survey, the purpose of Understanding Society is to understand social and economic change in Britain at the household and individual levels by capturing important information about the social and economic circumstances, attitudes and behaviours and health of people living in thousands of households. The Understanding Society study is a successor to the British Household Panel Survey (BHPS), with the BHPS sample forming part of Understanding Society from Wave 2 onwards.