The BHPS, also known as the Living in Britain Survey, was an annual, nationally representative panel study. Data was collected through household and individual questionnaires, a self-completion questionnaire on opinions of various subjects, and a proxy questionnaire for household members 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. For this second wave of the survey the variable modules were on lifetime histories of marital status, fertility, cohabitation, and employment status. In 2009 the BHPS was subsumed into a new longitudinal study called Understanding Society, or the United Kingdom Household Longitudinal Study (UKHLS).