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Abstract copyright UK Data Service and data collection copyright owner.The National Pupil Database (NPD) is one of the richest education datasets in the world. It is a longitudinal database which links pupil characteristics to information about attainment for those who attend schools and colleges in England. There are a range of data sources in the NPD providing detailed information about children's education at different stages (pre-school, primary and secondary education and further education). Pupil level information was first collected in January 2002 as part of the Pupil Level Annual Schools Census (PLASC). The School Census replaced the PLASC in 2006 for secondary schools and in 2007 for nursery, primary and special schools. The School Census is carried out three times a year in the spring, summer and autumn terms (January, May and October respectively) and provides the Department for Education with both pupil and school-level data. The NPD is available through the UK Data Archive in three tiers. Tiers two and three are the most sensitive and must be accessed via the Archive's safe room, whereas tier four can be accessed remotely through the Archive's Secure Lab. Tier two contains individual pupil level data which is identifiable and sensitive. Individual pupil level extracts include sensitive information about pupils and their characteristics, including items described as 'sensitive personal data' within the UK Data Protection Act 1998 which have been recoded to become less sensitive. Examples of sensitive data items include ethnic group major, ethnic group minor, language group major, language group minor, Special Educational Needs and eligibility for Free School Meals. Tier three represents aggregated school level data which is identifiable and sensitive. Included are aggregated extracts of school level data from the Department of Education's School Level Database which include items described as 'sensitive personal data' within the Data...