Directive 2013/30/EU on safety of offshore oil and gas operations (also known as Offshore Safety Directive - OSD) was published in 2013 with the aim of establishing minimum requirements for major accident prevention in offshore oil and gas operations and for limiting the consequences should such events occur. In accordance with the provisions of Article 41, Member States (MS) were obliged to complete the process of transposition of the Directive at national level by July 2015, and their appointed Competent Authorities (CA) for offshore safety were required to start applying in practice the provisions in their daily operations. Particularly in relation to existing installations – all laws, regulations and administrative provisions necessary to comply with the Offshore Safety Directive had to be implemented by July 19th, 2018 at the latest, as specified in the transitional provisions of Article 42. On 26th -28th November 2018, the technical workshop entitled 'Sharing EUOAG members’ experiences and practices in implementing their Competent Authorities' arrangements' was organised by the Joint Research Centre (JRC) – with the support of the Directorate-General for Energy (DG ENER) - in Ispra, Italy. The main purpose of the event was to provide opportunities to Member States for sharing and reviewing their experiences and practices in the development of their Competent Authority's arrangements for complying with the requirements of Directive 2013/30/EU. The present report summarises the main conclusions from that event, and identifies potential issues for further consideration by individual EU MS Competent Authorities, the European Union Offshore Oil and Gas Authorities Group (EUOAG) and the European Commission's Directorate-General for Energy (DG ENER).