![Nagłówek strony](https://wuwr.pl/public/journals/27/pageHeaderLogoImage_pl_PL.png)
In this paper fundamental information concerning the designing and conducting of comparative experiments, as methods which are able to be employed in the field of media studies, will be successively delineated. On the basis of the large-scale online experiment conducted in 15 countries in 2017, the assessment of the populist message impact as well as methodological challenges to such a project will be presented. We discuss challenges and lessons learnt from this type of research design.