This chapter presents the main existing theories of vagueness, as well as some possible theories which have not yet found advocates. Each theory is presented not necessarily as it was first presented in the literature, but rather as it looks from the point of view of the classical semantic picture. That is, the chapter examines whether, and if so how exactly, different theories of vagueness depart from that picture.
Keywords: vagueness, epistemicism, truth values, truth gaps, supervaluationism, plurivaluationism, contextualism, institutionism