This book constitutes the thoroughly refereed post-proceedings of the 6th International Workshop on Multi-Agent-Based Simulation, MABS 2005, held in Utrecht, The Netherlands in July 2005 as an associated event of AAMAS 2005, the main international conference on autonomous agents and multi-agent systems. The 12 revised full papers presented together with 1 invited talk were carefully reviewed. The papers are organized in topical sections on coalition emergence, theories and models, applications, and environments.

This book constitutes the thoroughly refereed post-proceedings of the Third International Workshop on Multi-Agent-Based Simulation, MABS 2002, held as part of the AAMAS 2002 conference in Bologna, Italy, in July 2002. The 12 revised full papers presented together with an invited paper were carefully selected during two rounds of reviewing and improvement. The papers are organized in topical sections on emergence, alliances, and groups; MABS platforms and languages; and MABS applications.

This year, Brazil celebrates its 500 years of discovery. To mark this great event, the Brazilian Arti cial Intelligence (AI) community organized a special int- national joint conference putting together SBIA 2000 (the Brazilian AI Sym- sium) and IBERAMIA 2000 (the Ibero-American AI Conference). SBIA 2000 is the 15th conference of the SBIA conference series, which is the leading conference in Brazil for presentation of research and applications in Arti cial Intelligence. Since 1995, SBIA has become an international conference, with papers written in English, an international program committee, and p- ceedings published in Springer-Verlag's Lecture Notes in Arti cial Intelligence (LNAI) series. IBERAMIA 2000 is the 7th conference of the IBERAMIA conference series, which has been one of the most suitable forums for ibero-american AI rese- chers (from South and Central America, Mexico, Spain, and Portugal) to present their results. Following the SBIA and EPIA (Portuguese conference on AI) ex- riences, from IBERAMIA'98 on, it has also become an international conference, with proceedings published in Springer-Verlag's LNAI series.

This book constitutes the thoroughly refereed post-workshop proceedings of the First International Workshop on Multi-Agent Systems and Agent-Based Simulation, MABS'98, held in Paris, France in July 1998 in conjunction with Agent World 1998. The 15 revised full papers presented together with an introduction by the volume editors were selected from a total of more than 50 submissions. Among the topics covered are multi-agent systems, social simulation, agent-based modelling, cognitive emergence, honey-bee colonies, artificial societies, economic aspects, cultural evolution, roles in agent systems, applications in various areas, etc.