@inbook { paiva04, abstract = {In this paper we describe the experiences we had at our group in building synthetic characters for virtual story telling and games applications. We provide an analysis framework useful to classify the autonomy of synthetic characters versus the control of the users over those characters. In this framework we distinguish between several types of autonomy of characters, in particular: scripted; partially scripted; influenced by role and autonomous. These types of autonomy can be found in some of the systems we have build at our group, namely Tristão and Isolda, Papous, Teatrix and FantasyA.}, chapter = {Life-like Characters. Tools, Affective Functions and Applications}, edition = {Helmut Prendinger, Mitsuru Ishizuka}, keywords = {autonomous agents, synthetic characters, storytelling, autonomy control, emotions}, pages = {361-376}, publisher = {Springer}, series = {Cognitive Technologies}, title = {Playing with Agents - Agents in Social and Dramatic Games}, year = {2004}, author = {Ana Paiva and Rui Prada and Isabel Machado and Carlos Martinho and Marco Vala and André Silva} }