Explaining subnational parliamentary scrutiny powers: A fuzzy-set analysis of German Landtage

While the European Union’s Lisbon Treaty has important implications for regional parliaments with legislative competences, most studies have focused on cross-country differences or examined the activities of regional parliaments at the EU level. This contribution shows the existence of substantial intra-country differences in the formal scrutiny rights of regional parliaments. We analyse how German regional parliaments (Landtage) have addressed the challenge of controlling their governments in EU affairs. Using fuzzy-set comparative qualitative analysis, we find that institutional and partisan factors (vote share in the second chamber, economic potential, and conservative governments) explain the differences found among German Landtage particularly well. Landtage with otherwise weak parliamentary prerogatives were successful in using the reform momentum to strengthen their rights in the field of EU policy. Combined with the party political salience of EU policy-making, the integration process has thus empowered formally weaker Landtage.