"Attitudes and Changing Contexts" is a scholarly book that deals with the philosophy of propositional attitudes and reference. The author presents a unified external perspective that is formalized within the semantics of possible worlds. By linking philosophical analyses of intentionality and reference with formal semantic theories of discourse representation and context change, a deep understanding of these concepts is fostered. A central element in this discussion is Stalnakerian diagonalization, which plays an important role in treating anaphora as referential expressions. Additionally, the relationship between belief changes and the semantic analyses of conditionals, as well as evidential and buletic propositional attitudes, is thoroughly discussed. This book is aimed at readers interested in the interfaces between philosophy and formal semantics, offering valuable insights into complex theoretical issues.