During the 1-2 weeks of interview, interviewers are accompanied by a supervisor to ensure work quality and understanding
1 interviewer is responsible for not more than 10% of total interviews
100% editing of all completed questionnaires
Minimum of 30% of each interviewer’s work is back-checked by independent QC staff
If any problem is identified with an interviewer’s work, then 100% of that interviewer’s work is checked
The interviewers are not allowed to work for other research agencies