As a new medium for questionnaire delivery, the Internet has the potential to revolutionize the survey process. Online (Web-based) questionnaires provide several advantages over traditional survey methods in terms of cost, speed, appearance, flexibility, functionality, and usability Bandilla et al. 2003; Dillman 2000; Kwak & Radler 2002]. Online-questionnaires can provide many capabilities not found in traditional paper-based questionnaires: they can include pop-up instructions and error messages; they can incorporate links; and it is possible to encode difficult skip patterns making such...