This book constitutes the refereed proceedings of the 21st International Conference on Principles and Practice of Multi-Agent Systems, PRIMA 2018, held in Tokyo, Japan, in October/November 2018. The 27 full papers presented and 31 short papers were carefully reviewed and selected from 103 submissions. PRIMA presents subjects in many application domains, particularly in e-commerce, and also in planning, logistics, manufacturing, robotics, decision support, transportation, entertainment, emergency relief and disaster management, and data mining and analytics.

This book constitutes the refereed proceedings of the 16th International Conference on Principles and Practice of Multi-Agent Systems, PRIMA 2013, held in Dunedin, New Zealand, in December 2013. The conference was co-located with the 26th Australasian Artificial International Conference, AI 2013. The 24 revised full papers presented together with 18 short papers and 2 invited papers were carefully reviewed and selected from 81 submissions. The papers are organized in topical sections on foundations of agents and multi-agent systems; agent and multi-agent system architectures; agent-oriented software engineering; agent-based modelling and simulation; cooperation/collaboration, coordination/communication; hybrid technologies, application domains; and applications.

Although the use of HTML and early Web browsers expanded the Internet - perience from mostly one-to-one interactions to that of one-to-many (massive publishing), this development still did not a?ord the sophisticated kinds of - cial interactions undertaken by people in the real world. Recently, however, new technologies(suchasWeblogs, Webservices, Websyndication, taggingwithfo- sonomies, and Wikis), sometimes collectively called Web 2.0 technologies, have appeared that o?er more socially oriented network interactions. This has led to the new system development mode of (a) employing lightweight scripting l- guages to bundle various Web 2.0 elements, or plugins, and then (b) deploying them on network servers, thereby establishing social network systems (SNS). The physical nature of the new network architectures is increasingly hete- geneous, comprising more lightweight portable devices (cell phones and PDAs) interacting with ever-more powerful multi-core network servers that host SNS. Emerging from these developments arepopular services such as Facebook, M- pace, Friendster, LiveJournal, Flickr, and YouTube. These sites employ tagging so that people can ?nd others with similar tastes and share media ?les stored on theservers.However, analystsandobserverspredictthatSNShavemuchgreater potential than merely exchanging media ?les; they are expected to a?ord opp- tunities to meet and engagein extended, creative, and more meaningful (in fact, unforeseeable) interactions that will greatly enhance the end-user experien

This book constitutes the thoroughly refereed post-conference proceedings of the International Workshop on Coordination, Organizations, Institutions, and Norms for Governance of Multi-Agent Systems, COINE 2022, which was held in Auckland, New Zealand, on May 9, 2022. The 14 papers included in these proceedings were carefully reviewed and selected from 15 submissions. They deal with autonomous agents and multi-agent systems, focusing on the scientific and technological aspects of social coordination, organizational theory, artificial (electronic) institutions, and normative and ethical MAS.

This book constitutes the thoroughly refereed post-conference proceedings of the 20th International Workshop on Multi-Agent-Based Simulation, MABS 2020, held in Auckland, New Zealand, in May 2020 collocated with 19th International Conference on Autonomous Agents and Multi-Agent Systems (AAMAS 2020). Due to COVID-19 the workshop has been held online. The 9 revised full papers included in this volume were carefully selected from 11 submissions. The workshop focused on finding efficient solutions to model complex social systems, in such areas as economics, management, organizational and social sciences in general and much more.