Errors in Web Surveys

First, however, we have to separate different types of Web surveys (Couper, in press). Unfortunately, the term “Web survey” is implicitly associated with non-professional, ad-hoc and self-selected forms on the Web, because they are the most numerous and most noticeable types of Web survey data collection. Today, the notion of “Web survey” thus already contains a flavour of low quality, what is not the case with “telephone surveys”, where we automatically assume a RDD or similar professional undertaking and not some call-in telephone survey.