The study reaches its main conclusions thanks to a relatively complex survey design developed by Merlin Schaeffer in collaboration with co-authors Asmus Leth Olsen from the Department of Political Science and Krzysztof Krakowski from King's College London.
In the survey, 4,800 ethnic Danish respondents rated the level of discrimination faced by people with Muslim-sounding names when applying for jobs or making similar enquiries to public schools, local politicians and housing landlords. The perceived level of discrimination was then compared to the actual levels documented in previous field experiments known as ‘audit studies’. These involve sending out identical applications, differing only in the applicant's name.
At the same time, participants were asked to respond to a series of questions about their views on discrimination as a societal problem, the causes of discrimination and a range of possible policy responses.
Finally, the participants - and this is the core of the study - were presented with varying degrees of additional information in distinct groups. One group of participants only provided their initial assessment. Another group was informed of the results of the social science audit studies. The third group received, in addition, statements explaining the problem of discrimination from either social scientists, lawyers, or individuals with lived experience of discrimination.
By employing a series of statistical analyses, the researchers were then able to isolate and measure the impact of additional information on participants' perceptions of discrimination.