Book excerpt: The articles in this volume examine a number of critical issues in grammaticalization studies, including the relationship between grammaticalization and pragmaticalization, subjectification and intersubjectification, and grammaticalization and language contact. The contributions consider data from a broad range of spoken and signed languages, including Greek, Japanese, Nigerian Pidgin, Swedish, and Turkish Sign Language. The authors work in a variety of theoretical frameworks, and draw on a number of research traditions. The volume will be of primary interest to historical linguists, though the diversity of approaches and sources of data mean that the volume is also likely have considerable general appeal.