The rules for electing the Members of the European Parliament (MEPs) are set both by EU laws, which apply to all Member States, and national laws, which differ from country to country. The common rules establish the principle of proportional representation, define electoral thresholds and specify activities that are incompatible with serving as an MEP. Other important details, such as the specific voting system and the number of constituencies, are decided by national laws. Source : © European Union, 2025 - EP Read more