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 431 results.
User guides
User Guide for MCS Sweeps 1-5
User guide for Sweeps 1-5 of the Millennium Cohort Study
Date published: 2 September 2020
User guides
MCS Age 14 User guide
User guide for the sixth sweep of the Millennium Cohort Study.
Date published: 2 September 2020
User guides
Millennium Cohort Study Longitudinal Files User Guide
This guide provides information about the mcs_longitudinal_family_file which is an important dataset of the Millennium Cohort Study (MCS). A new longitudinal cohort member file, named mcs_longitudinal_cm_file, has been introduced at individual cohort member level following the MCS data collection at age 23 (sweep 8) and is included in this version.
Version 3 updated: February 2026.
Date published: 2 September 2020
User guides
MCS Data Handling Guide
The Data Handling guide explains the data structures of MCS and provides solutions with different data handling strategies.
Date published: 2 September 2020
User guides
Next Steps Sweeps 1-7 User Guide
This user guide contains updated information relating to survey content on deposited data for sweeps 1 to 7 (ages 14-20) and sets out the changes to the Next Steps datasets held under EUL and SA at the UKDS. This document should be used alongside the main user guide LSYPE User Guide Waves One to Seven (Chapter 5).
Date published: 18 August 2020
User guides
BCS70 Age 16 Dietary Diaries User Guide
Guide to the Age 16 Dietary Diaries for BCS70.
Date published: 1 May 2020
User guides
BCS70 Age 34 User Guide
User guide to the dataset for the age 34 sweep of BCS70
Date published: 22 April 2020
User guides
BCS70 Age 46 Survey – Accelerometry User Guide
Accelerometry user guide for the BCS70 age 46 biomedical survey dataset
Date published: 27 March 2020
Questionnaires and interviewer instructions
MCS Age 17 Young Person Online Questionnaire
Young person online (CAWI) questionnaire for MCS 7.
Date published: 4 February 2020
Technical reports
MCS Age 17 Technical Report
This report provides an account of the design, development and conduct of the Age 17 Survey.
Date published: 30 January 2020
Centre for Longitudinal Studies
UCL Social Research Institute
20 Bedford Way
London WC1H 0AL
Email: clsdata@ucl.ac.uk
