World of the story		Audience model
	Narrative logic		Narrative sequencer
	Theatre
Audience

We aim at building a generator of dramatic actions, capable of interacting with the audience.

Therefore, the system is based on a combination of several theories of narrative.

From the structuralist theory (C. Bremond, T. Todorov, A. Greimas, etc.), we build a narrative logic, able to produce a set of possible actions at a given time. The narrative logic manipulates the following elements in the world of the story:

• Goals: Some states in the world of the story that characters want to reach
• Tasks: Concrete activities which lead to the goal
• Obstacles: practical elements in the world of the story which make some tasks impossible
• Actions: what characters do, including information transmission, influences, delegations, task performance, sanctions, etc.
• Characters: entities which have goals and perform actions

From pragmatics based theories (J.-M. Adams, U. Eco) we base our architecture on a dynamic audience model (or user model). The successive dramatic actions are organized by the narrative sequencer according to a simulated model of the user. For example, this model is responsible for expressing the need for surprise or conflict, which then triggers a corresponding action, if available. Current needs are:

• Ethical consistency
• Motivational consistency
• Relevance
• Complexity
• Characterization
• Conflict

Ethical consistency and conflict are based on the central concept of values. Values are thematic axes according to which each task is evaluated: honesty, friendship, family, fraternity, etc. They are stored in the audience model.

The theatre is responsible for representing the actions to the user, as well as managing the interaction with the user.