This book collects all the papers that appeared in 2005 in Kno- edge, Rationality and Action (KRA), a journal published as a s- cial section of Synthese, which addresses contemporary issues in epistemic logic, belief revision, game and decision theory, rational agency, planning and theories of action. As such, the special section appeals to researchers from Computer Science, Game Theory, Ar- ?cial Intelligence, Philosophy, Knowledge Representation, Logic and Agents, addressing issues in arti?cial systems that have to gather information, reason about it and then make a sensible decision about...

Contemporary epistemological and cognitive studies, as well as recent trends in computer science and game theory have revealed an increasingly important and intimate relationship between Information, Interaction, and Agency.

Agents perform actions based on the available information and in the presence of other interacting agents. From this perspective Information, Interaction, and Agency neatly ties together classical themes like rationality, decision-making and belief revision with games, strategies and learning in a multi-agent setting.

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