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design, each emphasizing a specific notion directly linked to potential causes of
non-response (=declining further panel participation). In the interview section
prior to the panel recruitment question we also measured corresponding survey
attitudes. This design allows us to determine the effectiveness of the various
recruitment question versions with respect to subgroups of respondents who are
prone to specific positive or negative survey attitudes. We will discuss results in
light of an adaptive recruitment strategy that matches the recruitment question
wording to previously answered survey attitude items. In addition to recruitment
success (proportion of respondents agreeing to further panel participation) we
also examine potential non-response biases that might be introduced in the
panel due to selective panel cooperation.