This book contains 15 revised papers originally presented at a symposium at Rosendal, Norway, under the aegis of The Centre for Advanced Study (CAS) at the Norwegian Academy of Science and Letters. The overall theme of the volume is `internal factors in grammatical change.' The papers focus on fundamental questions in theoretically-based historical linguistics from a broad perspective. Several of the papers relate to grammaticalization in different ways, but are generally critical of `Grammaticalization Theory'. Further papers focus on the causes of syntactic change, pinpointing both extra-syntactic (exogenous) causes and - more controversially - internally driven (endogenous) causes. The volume is rounded up by contributions on morphological change `by itself.' A wide range of languages is covered, including Tsova-Tush (Nakh-Dagestan), Zoque, and Athapaskan languages, in addition to Indo-European languages, both the more familiar ones and some less well-studied varieties.