Topics addressed include talking heads, conversational agents, tutoring systems, multimodal communication, machine learning, architectures for multimodal dialogue systems, evaluation systems, and annotation data. This title will prove very valuable for scientists, researchers and practitioners working in the fields of natural interactive systems, multimodal systems, conversational agents, spoken dialogue systems, natural language processing applications, advanced human-computer interfaces, analysis of multimodal data, evaluation of multimodal systems, and the education system.