“Certain populations, such as university professors, federal government employees, workers in many companies and corporations, and members of some professional organizations, generally have Internet address and access. For these populations, e-mail and Web surveys may have only minor coverage problems. (Dillman, 2000, p. 356)” Quoted in Cook et al.

Notes several factors having positive impact on response rates. Pre-contact. Personalized letter, salience, official support. (Survey length did not negatively impact).

“In our analysis, the mean response rate for the 68 surveys reported in 49 studies was 39.6%(SD=19.6%). As reported in Table1, the mean response rate for the 56 surveys reported in 39 studies with no missing data on 16 varibles was 34.6% (SD= 15.7%). Our results for electronic surveys support those of Heberlein and Baumgartner (1978) for mail surveys in several ways but in other ways differ from those results. As indicated in Table1 and Figures 1 through 3,the number of contacts, personalized contacts, and precontacts were the dominant factors affecting response rates for our study.” p. 829