As I said before, you have to understand that where the question module is placed in the questionnaire often has an impact on the answers given to subsequent questions. For instance, information about education is followed by information about the workplace and various aspects of employment.
What we have to verify is the extent to which the place of the questions might destroy comparability with the information we have gathered over the years with regard to education and employment. So we have to make sure that any new questions that are introduced do not destroy comparability, because that can happen. When questions are added, there is a risk that people will switch off and stop answering subsequent questions in the other modules.
When we conduct qualitative and quantitative testing, we can play with the placement of those questions to ensure consistency and that it is logical and can be understood by respondents.