Note: This table gives an overview of the (former) political parties in the Netherlands. We have aimed to include all political parties that have been elected into parliament at some point between 1970 and 2021. We also indicated whether they are included in the Manifesto Project Database sample and/or in the Dutch Parliamentary Election Studies sample. The column ‘Party family’ indicates to which party family the party belongs. This classification is based on Andeweg et al. (2020). Unlike these authors, we refer to Christian parties and not Christian democratic parties. We also included the Party for the Animals in the greens and not in the ‘other’ category. The column “Left vs. Right” indicates whether the party can be classified as left, center, or right. This classification is based on the guidelines used by Armingeon et al. (2023). We have not classified parties that do not clearly belong to a party family.