The book "Argumentation in Multi-Agent Systems" offers a comprehensive examination of the role of argumentation within Artificial Intelligence, particularly in multi-agent systems. Over the past decade, argumentation has established itself as a crucial tool for modeling the internal reasoning of agents. It enables the analysis, design, and implementation of complex interactions among rational agents, thereby making a significant contribution to the theory and practice of multi-agent dialogues. The application areas are diverse, ranging from non-monotonic reasoning and legal disputes to team formation and risk management. This collection presents the latest developments at the intersection of argumentation theory and multi-agent systems, based on carefully selected and revised contributions from the AAMAS 2008 conference.