Here you will find all the documentation for our studies. This includes survey questionnaires, interviewer instructions, showcards, technical reports, survey reports, and derived variables. For more information, take a look at our guide to the different documentation types.
Showing 425 results.
User guides
MCS Age 14 Sweep time use diary user guide
This user guide provides an introduction to the fully harmonised time use diary data collected during the Age 14 Sweep of the Millennium Cohort Study.
Date published: 28 October 2025
User guides
Next Steps 2019 Web Survey User Guide
This user guide provides information about the data arising from the Next Steps 2019 Web Survey.
Date published: 23 October 2025
Questionnaires and interviewer instructions
Next Steps 2019 Web Survey Questionnaire
This questionnaire pertains to the Next Steps 2019 Web Survey.
Date published: 23 October 2025
User guides
UK Early Life Cohort Feasibility Study: Age 9-10 months sweep User guide
The comprehensive guide to the data from the UK Early Life Cohort Feasibility Study: Age 9-10 months sweep.
Date published: 3 October 2025
Polygenic indices in four national longitudinal cohorts user guide
This document describes the process by which polygenic indexes (PGIs) for 44 traits have been constructed in four UK longitudinal cohort studies: 1958 National Child Development Study (NCDS), 1970 British Cohort Study (BCS70), Millennium Cohort Study (MCS) and Next Steps.
Date published: 24 September 2025
User guides
Millennium Cohort Study Linked education administrative datasets Ofsted User Guide
This user guide describes the data linkage of education administrative records from the publicly available Ofsted reporting of school inspections in England to survey data for cohort members in the Millennium Cohort Study (MCS).
Date published: 2 September 2025
User guides
1958 National Child Development Study Age 62 Geographical Identifiers User Guide
A user guide which provides guidance and recommendations for using geographical identifiers in 1958 National Child Development Study Age 62 Sweep (Sweep 10) data.
Date published: 20 August 2025
User guides
Harmonised indicators of self-reported asthma in five British cohort studies User Guide
This user guide documents the harmonised indicators of all self-reported measures related to asthma in five British cohort studies: the MRC National Survey of Health and Development (NSHD), the 1958 National Child Development Study (NCDS), the 1970 British Cohort Study (BCS), Next Steps, and the Millennium Cohort Study.
Date published: 18 July 2025
User guides
Harmonised indicators of self-reported diabetes in five British cohort studies User Guide
This user guide documents the harmonised indicators of all self-reported measures related to diabetes in five British cohort studies: the MRC National Survey of Health and Development (NSHD), the 1958 National Child Development Study (NCDS), the 1970 British Cohort Study (BCS), Next Steps, and the Millennium Cohort Study.
Date published: 18 July 2025
User guides
Fertility histories in four British cohort studies User Guide
This user guide accompanies the deposit of datasets on the Cohort Members (CM) fertility histories in four UK cohort studies: MRC National Survey of Health and Development (NSHD), the 1958 National Child Development Study (NCDS), the 1970 British Cohort Study (BCS), and Next Steps.
Date published: 18 July 2025