Since the 2017 German Federal Election, members of parliament have been trying to negotiate an electoral reform to reduce the number of mandate holders. In 2018, I interviewed MPs who were involved in a working group headed by the Speaker of the Bundestag which was concerned with identifying avenues for potential reforms. My results will be published in the upcoming issue of the German journal Zeitschrift fuer Parlamentsfragen. I find that the participants of the working group sought to integrate external experts into the process to mitigate self-interest behavior. While MPs’ preferences for the main electoral system type is motivated by self-interest, values have an impact on the preferred detailed design of the electoral law.