Although everyone recognizes communication as a central concept in mul- agents, many no longer see agent communication as a research topic. Unf- tunately there seems to be a tendency to regard communication as a kind of information exchange that can easily be covered using the standard FIPA ACL. However, the papers in this volume show that research in agent communication is far from ?nished. If we want to develop the full potential of multi-agent s- tems, agent communication should also develop to a level beyond parameter or value passing as is done in OO approaches In this book we present...