The book examines the relation between (inter-)subjectification and grammaticalization. As such, its aims are to clearly delineate the domain of (inter-)subjectivity - the encoding of speaker and hearer-orientation - in the language system, and to elaborate a grammar-based definition of the diachronic counterparts subjectification and intersubjectification. At the descriptive level, it seeks to test these hypotheses in three areas of grammaticalization research: adverbials, modals and the NP.