All eligible study members were contacted.
| Responded | tbc |
| Cumulative total of deaths | tbc |
| Cumulative permanent refusals | tbc |
| Temporarily living abroad | tbc |
| Cumulative Emigrated | tbc |
| Failure to contact | tbc |
Cohort members who were still at school completed the postal questionnaire about intentions for further education and work, and on leisure interests and health, and the short version of the Maudsley Personality Inventory 1).
Teachers completed the postal questionnaire about the school for those who had not yet left, and the cohort member’s examinations, absences, and temperament.
Local Education Authorities were asked in a postal questionnaire about whether the cohort member was still at school.
Cohort members who had become students in further or higher education, for example in post-school colleges or universities, were asked to complete a postal questionnaire about the university or college, preparation for work, holidays and leisure interests and health, and the short Maudsley Personality Inventory.
Administrative authorities at colleges were asked to complete a postal questionnaire about examinations taken by the cohort member, and about health and temperament.
Cohort members who were no longer continuing in formal education were asked if they would consent to be interviewed by the local Youth Employment Officer about work, training and health; they were also asked at that interview to complete questions about work.
Instructions are given at the head of each form.