Documentation

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.

  • National Child Development Study
  • 1970 British Cohort Study
  • Next Steps
  • Millennium Cohort Study
  • COVID Social Mobility & Opportunities study
  • Growing Up in the 2020s study
  • Growing up in Digital Europe
  • Children of the 2020s study
  • Early Life Cohort Feasibility Study
  • Generation New Era
  • linkage
  • Coding frames
  • Data notes
  • Derived variables
  • Ethical review and consent
  • Laboratory procedures
  • Questionnaires and interviewer instructions
  • Showcards
  • Survey reports
  • Technical reports
  • User guides

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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

Author: Tim T Morris, Gemma Shireby, Liam Wright, Aida Sanchez-Galvez, Georg Otto, David Bann.

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

Contact us

Centre for Longitudinal Studies
UCL Social Research Institute

20 Bedford Way
London WC1H 0AL

Email: clsdata@ucl.ac.uk

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