The UK censuses took place on 21st April 1991. They were run by the Census Office for Northern Ireland, General Register Office for Scotland, and the Office of Population and Surveys for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics, and underpin funding allocation to provide public services. The Northern Ireland Household Sample of Anonymised Records (SAR) is a 1% sample of households and all individuals in those households. It is a hierarchical file allowing linkages between individuals. The SARs were drawn from the fully coded set of Census records returned by households and institutions. They therefore omit wholly imputed households and also households that were missed by the Census. The NI Household SAR contains 81 variables, similar to those in the Individual file. However, the structure of the file allows a large number of other variables to be derived. The sampling strategy used is similar to that used in GB, however, while in GB only 10% of cases were fully coded, in Northern Ireland all cases were fully coded. Consequently the NI file was not drawn from a pre-existing 10% sample. New variables have been created for the hierarchical household file since summary information about a household can be computed from data about the individuals in that household. Further information, including guides and other documentation, may be found on the Cathie Marsh Centre for Survey Research Samples of Anonymised Records (SARS) website. Variables included in the 1991 NI Household SAR include (for entire or household/individual members): age, sex, marital status, employment status, religion, occupation, industry, social class, accommodation, bath/shower and indoor toilet facilities, tenure, economic position and social class of family head; number of pensioners/students/sick persons/persons with long-term illness/economically active and inactive/retired/employed and unemployed/under 16-year-olds/dependants in the household.