Based on Ellen Mastenbroek’s inaugural lecture ‘More than the sum of its parts’, held at Radboud University, 15 September 2017 and two related articles (Van Voorst and Mastenbroek, 2017; Mastenbroek et al, 2016).
In this contribution, we critically assess the EU’s system for ex-post evaluation, using fresh empirical data. We find that the Commission has not met its repeated ambition to produce systematic and high-quality ex-post evaluation of all important EU legislation. Both the coverage and quality of ex-post evaluations have been variant. This lack of systematic high-quality evaluation is problematic, as such evaluations can fulfill important functions in the EU policy cycle: learning, accountability and improved enforcement. It also bring strategic risks for the Commission, primarily reduced credibility.