Theo has a
frame-based memory system.
All knowledge is stored symbolically in
< entity > < slot > =
< value > triplets.
In Theo-Agent, this symbolic world model is used to keep a representation of the current world state. However, this world model is based completely on the currently sensed percepts. Thus, there are no difficulties due to the Frame Problem but Theo-Agent can only reason about those objects which it is currently aware of through perception.
Go to a discussion of this property for multiple architectures.