This text offers a detailed study of the clausal architecture of infinitival constructions providing a unified analysis of restructuring, control, modals and raising. The book critically evaluates previous proposals from both syntactic and semantic perspectives and presents a new analysis incorporating many recent developments in generative linguistic theory. In addition to its theoretical contribution, the text also contains a detailed descriptive overview of a range of constructions, primarily from the Germanic languages and should thus not only be of value to generative linguists but should also serve as a general reference source for those interested in the Germanic languages.