Outside of the U.S., there has been a great deal of interest in voter-advice applications (VAAs). These tools give voters an opportunity to get unbiased advice about which candidates or parties to support, usually in complex multicandidate or multiparty contexts.

However the academic research on VAAs has, to date, focused on observational studies and hasn’t shown a clear causal connection between VAA use and changes in voting intentions. However, Joelle Pianzola, Alexander H. Trechsel, Kristjan Vassil, Guido Schwerdt, and I just published a paper in the Journal of Politics, “The Impact of Personalized Information on Vote Intention: Evidence from a Randomized Field Experiment.” In the paper we present evidence from a randomized controlled field experiment in Switzerland that indicates that VAA use produced changes in voter intentions.

Here’s the paper’s abstract:

Voting advice applications (VAAs) are voter information tools that millions of individuals have used in recent elections throughout the world. However, little is known about how they affect political behavior. Until now, observational studies of VAA have produced inconclusive results. Here we present the results from a randomized field experiment in Switzerland that estimates the causal effects of VAA use on voters’ vote intentions. Our results suggest that usage of the Swiss VAA smartvote strengthened the vote intention for the most preferred party and also increased the number of parties considered as potential vote options. These results imply that VAAs can influence voting behavior and that they can play an important role in electoral politics.