Despite recent progress in plan-based narrative generation,udone major limitation is that systems tend to produce a singleudplotline whose progression entirely determines the narrative experience.udHowever, for certain narrative genres such as serial dramas andudsoaps, multiple interleaved subplots are expected by the audience, asudthis tends to be the norm in real-world, human-authored narratives.udCurrent narrative generation techniques have overlooked this importantudrequirement, something which could improve the perceivedudquality of generated stories. To this end, we have developed a flexibleudplan-based approach to multiplot narrative generation, that successfullyudgenerates narratives conforming to different subplot profiles,udin terms of the number of subplots interleaved and the relative timeudspent on each presentation. We have identified specific challengesudsuch as: distribution of virtual characters across subplots; length ofudeach subplot presentation; and transitioning between subplots.udIn this paper, we overview this approach and describe its operationudin a prototype Interactive Storytelling (IS) System set in the serialuddrama genre. Results of experiments with the system demonstrate itsudusability. Furthermore, results of a user study highlight the potentialudof the approach, with clear user preference for presentations thatudfeature interleaved multiple subplots.
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