The BHPS, also known as the Living in Britain Survey, was an annual, nationally representative panel study. 1991-1992 was the first year in the series. Data was collected through a household questionnaire, an individual questionnaire, a self-completion questionnaire on opinions of various subjects, and a proxy questionnaire for household members living away from home. Core questionnaire modules, included in most years of the survey, were on topics of household demographics, housing, health, employment, income, household expenditures, finances, and values and opinions. Rotating core modules were included with less frequency and variable modules were used occasionally to collect information that does not change significantly from year to year. In 2009, the BHPS was subsumed into a new longitudinal study called Understanding Society, or the United Kingdom Household Longitudinal Study (UKHLS).