6.1 Respondents and Instruments

It is preferable that both parents/guardians who are resident with the child at age 3

years are interviewed. Ideally there would be longitudinal consistency in the

individual who completes the primary caregiver-type instrument as much as feasible

and depending on the family context at the time of the wave 2 interview.

It is recommended that the main interview with each parent/guardian is conducted

face-to-face, with more sensitive questions extracted into a self-complete module.

An in-home visit would be necessary to complete physical measurements and

cognitive assessments of the child.

Other potential respondents, where applicable, are the child’s non-resident, biological

parent and their non-parental caregiver (e.g. childminder). These respondents are

discussed in more detail later.

6.2 Sample