Early-career researchers should be wary of academic-institution rankings, warns the European University Association (EUA) in Brussels. In Global University Rankings and Their Impact, out on 17 June, the EUA highlights problems with ratings, including exclusivity, lack of transparency and the possibility that institutions could falsify statistics to boost their scores. Lesley Wilson, secretary-general of the EUA, says researchers should consult only rankings compiled by public bodies that specify how they reach their conclusions.