User modeling
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Preference model
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Preference modeling refers to modeling users' individual tastes and allows for a personalized experience. We model preferences as a Personal Knowledge Graph (PKG), where nodes can be either items or attributes. The preference model assumes a temporal ordering of the preference data and is built such that it remains consistent across simulations and assumes a temporal ordering.

Context model
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In addition to preference and interaction modeling, we also model other user contexts, such as temporal and relational context.
For example, during *weekdays*, a person might be busy with work and have other obligations that can change e.g., the information that they are willing to provide. On the other hand, during *weekends*, people are usually more relaxed and in a better mood in general, which could lead to the opposite effect.

Persona
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Persona contains user variables, e.g., age, education level, etc. These characteristics also affect the behaviour and language usage of a person. People with higher education might use more formal or refined language. Age might also affect word choices and sentence structure.