The article outlines the main motivations for the Guise Theory and its intriguing theses concerning identity, predication, existence, and fiction. The second part of the article is devoted to assessment of Castañeda’s theory. It discusses the most influential critiques of the Guise Theory, as well as (important from a historical point of view) Russell’s objection to theories of nonexistent objects. The last section of the article contains a comparison of the Guise Theory with the Meinong’s Theory of Objects, and points (...) out that despite various similarities, we should draw a distinction between original and moderate versions of Meinong’s theory. The main motivation for this distinction are differences between accounts of predications, which allow us to call the Guise Theory “quasi-Meinongian” rather than just “Meinongian”. This is because one of its main claims comes rather form the work of Meinong’s pupil Ernst Mally, and not from Meinong himself. (shrink)