The 15 full papers presented together with 7 short papers in this book were carefully reviewed and selected from 40 submissions. The workshop covers a wide range on the following topics such as agency; argumentation and agreement; belief
representation; probability and uncertainty; belief revision and belief merging; knowledgeand action; dynamics of informational attitudes; intentions, plans, and goals; decision
making and planning; preference and utility; cooperation; strategic reasoning and
game theory; epistemology; social choice; social interaction; speech acts; knowledge
representation; norms and normative systems; natural language; rationality; philosophical
logic.