Book excerpt: This collective volume focuses on the latest developments in the study of grammaticalization and related processes of change such as degrammaticalization, constructionalization, lexicalization, and petrification. It addresses topical issues relating to the motivations, sources, defining features, and outcomes of these changes. New theoretical reflections are offered on the pragmatic motivation of grammaticalization paths, process-oriented differences between grammaticalization, lexicalization and degrammaticalization, the question of gradualness and pace of grammaticalization, and deictics as a distinct source of grammaticalization. The articles describe various constructional and distributional changes affecting deictics, determiners, reflexives, clitics, nouns, affixes, adverbs and (auxiliary) verbs, mainly in the Germanic and Romance languages. The volume will be of great interest to historical linguists working on grammaticalization and related changes, and to all linguists working on the interface between morphosyntax, semantics, pragmatics and discourse.