The literature finds evidence that the presence of strong institutional veto players correlates with policy gridlocks. In recent years, in several European countries the rationale of parliamentary second chambers as veto players has been called into question. With regard to Italy, in 2016 the parliament approved a broad constitutional reform, later rejected by a referendum. According to the proponents, this reform would have made Italian institutions more functional in a comparative perspective. Did voters actually block some sort of functionality? To answer this question, this article presents a systematic comparison of second chambers in the European Union. The theoretical framework is based on three dimensions of strength, operationalized by means of quantitative indicators and a comprehensive index of strength. The article ends with a discussion of the findings and a proposal for further research outlooks