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Evaluating the Authorial Leverage of Drama Management



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Evaluating the Authorial Leverage of Drama Management Sherol Chen 1 Mark J Nelson 1 2 Anne Sullivan 1 Michael Mateas1 1 2 Expressive Intelligence Studio University of California Santa Cruz sherol anne michaelm soe ucsc edu School of Interactive Computing Georgia Institute of Technology mnelson cc gatech edu A drama manager DM monitors an interactive experience such as a computer game and intervenes to shape the global experience so that it satisfies the author s expressive goals without decreasing a player s interactive agency Most research work on drama management has proposed AI architectures and provided abstract evaluations of their effectiveness A smaller body of work has evaluated the effect of drama management on player experience but little attention has been paid to evaluating the authorial leverage provided by a drama management architecture determining for a given DM architecture the additional non linear story complexity a DM affords over traditional scripting methods In this paper we propose three criteria for evaluating the authorial leverage of a DM 1 the script and trigger complexity of the DM story policy 2 the degree of policy change given changes to story elements and 3 the average story branching factor for DM policies vs script and trigger policies for stories of equivalent quality We present preliminary work towards applying these metrics to declarative optimization based drama management using decision tree learning to capture the equivalent trigger logic for a DM policy determining whether that is the case depends on determining both the complexity of an authoring approach and the gains it provides Previous work has studied how experience quality can be improved by drama management This does not directly imply an authorial benefit however To show that there needs to be some reason to believe that traditional authoring methods could not have achieved the same results or that they would have required considerably more effort to do so A way to



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