Advances in Agent Communication : International Workshop on Agent Communication Languages ACL 2003 Melbourne Australia July 14 2003. Revised and Invited Papers This book is based on the thoroughly refereed post workshop proceedings of the International Workshop on Agent Communication Languages ACL held in conjunction with AAMAS 2003 in Melbourne Australia in July 2003. Besides the 12 workshop papers 10 additional papers on agent communication mainly from the AAMAS 2003 main conference are included in this volume. The book presents a coherent and complete overview of the state of the art in agent communication. The papers are organized in topical sections on fundamentals of agent communication; agent communication and commitments; communication within groups of agents; dialogues