Intelligent agents are computer systems that are capable of flexible autonomous action in dynamic, typically multi-agent domains. Over the past few years, the computer science community has begun to recognise that the technology of intelligent agents provides the key to solving a range of complex software application problems, for which traditional software engineering tools and techniques offer no solution. This book, the third in a series, represents the state of the art in the science of agent systems. It is based on papers presented at the 3rd workshop on Agent Theories, Architectures and Languages (ATAL'96), held in conjunction with the European Conference on Artificial Intelligence (ECAI'96) in Budapest, Hungary, in August 1996. It is essential reading for anyone interested in this vital new technology.