In this paper, my primary goal is to test if vote conversion is in line with voters' perceptions of parties' competence, i.e. if the competence change in favor of a party during the political campaign triggers vote conversion in favor of this same party. Then, I assess the moderating role of saliency and political knowledge and the difference between ‘valence' and 'positional' issues. I use a four-waves panel data gathered before and after the 2015 Swiss national elections. The results indicate that if a voter changes her competence perceptions in favor of a party, she is more likely to convert her vote in favor of this party. In general, saliency and knowledge are not strong moderators of this relationship. While the study also points out the major role of the ‘migration' and the ‘European Union' issues, the findings about valence and positional issues are not crystal clear.