This book constitutes the thoroughly refereed post-proceedings of the Third International Workshop on Engineering Societies in the Agents World, ESAW 2003, held in Madrid, Spain in September 2002.

The 20 revised full papers presented were carefully selected from 35 submissions during two rounds of reviewing and improvement. The papers are organized in topical sections on views, models, engineering, and modeling and design.

Emotion pervades human life in general, and human communication in particular, and this sets information technology a challenge. Traditionally, IT has focused on allowing people to accomplish practical tasks efficiently, setting emotion to one side. That was acceptable when technology was a small part of life, but as technology and life become increasingly interwoven we can no longer ask people to suspend their emotional nature and habits when they interact with technology.

The European Commission funded a series of related research projects on emotion and computing, culminating in...