Centre for Longitudinal Study Information and User Support (CeLSIUS) exists to assist people in UK higher education to analyse the Office for National Statistics Longitudinal Study (ONS LS). CeLSIUS is part of the Economic and Social Research Council's (ESRC) Census Programme for 2006-2011. Part of the service it offers is the provision of web-based tools and extracts, including the subset of the ONS LS. Further information about CeLSIUS is available from the CeLSIUS web site and the ESRC Award web page. Ethnicity and Economic Activity: Longitudinal Perspectives, 1971-2006 is an aggregated teaching dataset which has 1,120 records (i.e. combinations of values of the variables). It is based on 333,015 cases; cases are ONS LS sample members who were present at all three of the most recent censuses of England and Wales (1981, 1991 and 2001). The ONS LS sample provides a random, one per cent sample of the population of England and Wales, clustered by date of birth. The documentation includes exercises to accompany the dataset with instructions for both SPSS and Stata users. Exercises centre on exploring the dataset by ethnicity, age, gender, country of birth and economic activity status. The dataset includes the following eight variables:ethnicity grouped 2001sexage group in 2001whether born outside UK (from 1981 Census) whether economically active in 1981whether economically active in 1991whether economically active in 2001weight variable