This workshop provided an opportunity to review the main scientific advances in predictability, dynamical process studies and applications of ensemble forecasts across the medium and S2S forecast ranges. Examples of sectors rapidly developing in ensemble applications included energy, retail and agriculture, as well as disaster risk mitigation worldwide. The emphasis was on the utilisation of the TIGGE and S2S databases in research and contributions on seamless prediction, multi-model prediction and ensemble post-processing are particularly welcome. One session was dedicated to the technical development of ensembles, the TIGGE and S2S data bases and proposals for future development.