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234 Socially Intelligent AgentsThe basic building blocks of story and plot — autonomous characters, actionsand their causal relationships — are not new to researchers in ArtificialIntelligence. These notions are the stuff that makes up most representationalschemes in research that deals with reasoning about the physical world. Muchof this work has been adapted in the Mimesis architecture to represent the hierarchicaland causal nature of narratives identified by narrative theorists [1].The idea that Grice’s Co-operative Principle might be put to use to characterizeinteractions between people and computers is also not new [5]. But the questionof balance between narrative coherence and user control remains an open one,and will not likely be answered by research into human-computer interaction orby modification of conventions carried from over previous entertainment media.It seems more likely that the balance between interactivity and immersionwill be established by the concurrent evolution (or by the co-evolution) of thetechnology of storytelling and social expectations held by the systems’ users.References[1] Mieke Bal. Introduction to the Theory of Narrative. University of Toronto Press, Toronto,Ontario, 1997.[2] Edward Branigan. Narrative Comprehension and Film. Routledge, London and New York,1992.[3] H. Paul Grice. Logic and Conversation. In P. Cole and J. L. Morgan, editor, Syntax andSemantics, vol. 9, Pragmatics, pages 113–128. Academic Press, New York, 1975.[4] Patrick Doyle and Barbara Hayes-Roth. Agents in Annotated Worlds. In Proceedings ofthe Second International Conference on Autonomous Agents, pages 35–40, 1998.[5] R. Michael Young. Using Grice’s Maxim of Quantity to Select the Content of Plan Descriptions.Artificial Intelligence, 115:215–256, 1999.[6] R. Michael Young. An Overview of the Mimesis Architecture: Integrating IntelligentNarrative Control into an Existing Gaming Environment. In The Working Notes of theAAAI Spring Symposium on Artificial Intelligence and Interactive Entertainment, Stanford,California, pages 77–81, 2001.[7] R. Michael Young and Martha Pollack and Johanna Moore. Decomposition and Causality inPartial Order Planning. In Proceedings of the Second International Conference on ArtificialIntelligence and Planning Systems, pages 188–193, 1994.[8] Clifford Reeves and Byron Nass. The Media Equation. Cambridge University Press,Cambridge, England, 1996.[9] Richard Gerrig. Experiencing Narrative Worlds. Yale University Press, New Haven, Connecticut,1993.