Quality control

Quality control

1. Important in reducing measurement error

2. Questionnaire lay-out and instructions

3. Colleague feedback

4. Translation and piloting

5. Training interviewers

   • Possible interview errors
     • Asking errors (omitting or changing questions)
     • Probing errors
       • When interviewer does not probe when necessary or correctly
     • Recording errors
     • Cheating
     • leads to interviewer bias
   • Create interviewer's manual

6. Field testing

7. Revision

8. Data processing

9. Sample collection

10. Data collection

11. Regular documentation of procedures and staff duties