After the conference, additional guidance will be provided to the authors of the accepted documents for the preparation of final versions to be included in subsequent procedures. This book presents the revised post-conference reports of the 17th European Conference on Multi-Agent Systems, EUMAS 2020, and the 7th International Conference on Agreement Technologies, AT 2020, which were originally scheduled to be held in April 2020 in Thessaloniki, Greece. Due to the COVID-19 pandemic, the conference was postponed to September 2020 and eventually became a fully virtual conference. The 38 full papers presented in this volume were carefully reviewed and selected from a total of 53 submissions. Contributions cover both early and completed research and cover a wide range of topics in the field of autonomous agents and multi-agent systems. TA 2020 will take place on the 22nd and 23rd.
September 10, 2021