<p>In any survey, despite researchers’ best efforts in the use of scientific techniques, results can only be drawn and generalised based on the amount of information that is returned: that is, on the response rate or returns they obtain from the groups they sought information from. Although most research texts suggest ways in which researchers can increase response rates from surveys, there is a dearth of information in the methodology and academic press about how the researcher should deal with non-responses to mailed questionnaires. The aim of this paper is to identify likely reasons for non-responses to questionnaires and to discuss strategies researchers can employ to optimise responses.</p>