Grammaticalization theory has played a major role in the developments in language typology and functional linguistics during the last three decades. Grammaticalization phenomena show that grammars evolve in a continuous way following cross-linguistically established diachronic paths.

The contributions in this book shed new light on some central issues in grammaticalization theory such as the (uni-)directionality debate, the relation between grammaticalization and constructions, and the concept of multiple grammaticalization.

Evidence for grammaticalization in several domains...