The ability to communicate in a complex manner with others, to exchange ideas and thoughts, to convey factual information as well as wishes, goals, and plans, to issue commands, instructions and questions, and to express emotions and interact on a social level, is one of the most important and distinguishing aspects of humankind. If artificial agents want to progress to the next level, and truly and deeply interact with humans, they must possess expanded communicative abilities. Interdisciplinary research, integrating methods and models from computer science, psychology, engineering, linguistics, philosophy, mathematics, and others, has provided a basis for the development of artificial agents and an extension of their "human" characteristics and abilities. Building on the approaches developed so far, this workshop focuses on new methods and models to describe and implement communication between human and artificial agents, in all forms and on all levels. The ultimate goal of this endeavour is to bridge the gap between the richness, complexity and expressiveness of human communication, and the (in)ability of artificial agents to interact and communicate adequately with their human partners. http://www.cs.umanitoba.ca/~ckemke/CHAA-07/