This working paper includes a collection of case notes written by the national judges who attended the European Networking and Training for National Competition Enforcers (ENTraNCE Judges 2016). The training programme was organised by RSCAS between September, 2015, and June, 2016, with the financial contribution of the DG Competition of the European Commission. The case notes included in the working paper summarise judgments from different EU Member States that relate to diverse aspects of competition law enforcement. The working paper thus aims to increase understanding of the challenges that are faced by the national judiciary in enforcing national and EU competition in the context of the decentralised regime of competition law enforcement that was introduced by Reg. 1/2003.ENTraNCE Training of National Judges – Call for Proposals 2014. Financial support of DG Competition of the European Commission. Grant agreement HT.4430/SI2.70159