Are you comfortable with doing surveys in which up to half of the responses you’re receiving are fraudulent? Or in which you’re getting a heavily biased group of respondents?
With all of the changes happening in market research, we can’t forget the importance of basic skills. Without the basics, all the shiny new stuff doesn’t work.
Before you put any questionnaire in the field, take the survey yourself as a respondent. You’ll be surprised what you find.
Longitudinal studies can influence how people respond to your questions simply by the fact that you have researched them before. And if you’re not careful, this problem can come about even when you’re not doing a longitudinal study.