How to be fragmented?

Actual human agents have limited cognitive capacity. They might display deductive failure, contradictory beliefs and imperfect recall. These and other similar cases raise a problem for idealized models of belief and behavior. The purpose of this thesis is to provide a way to accommodate these cases through a model of belief formation and retrieval based on information access. I will argue that belief formation and retrieval are sensitive to the informational context within which they take place. Human agents deploy information relative to the set of possibilities they take to be relevant.