The (non-)use of ex post legislative evaluations by the European Commission

The European Commission has repeatedly emphasized that the results of ex post legislative (EPL) evaluations should be used to improve the quality of its legislative proposals. This article aims to explain the variation in such instrumental use of EPL evaluations by the Commission. Three high-quality EPL evaluations with varying levels of use were studied in-depth to assess the influence of political factors on evaluation use. The results show that, contrary to expectations, EPL evaluations may be used instrumentally even if their recommendations are opposed by important political actors in the legislative process. This article also shows that a lack of salience of the policy field to which an EPL evaluation belongs in the eyes of the Commission could, in combination with the institution's ambition to reduce its legislative output, be a sufficient condition for the non-use of that evaluation.