Recent developments in generative grammar have been very stimulating. The current theory defines a small set of principles that apply to all human languages. Efforts have been made to demonstrate the adequacy of this theory for a wide range of languages. We thus see an interesting interface of theory and empirical data: the study of natural languages contributes to defining the properties of Universal Grammar and the predictions of the theory help in uncovering generalizations regarding natural languages. This book aims to add to this exciting development by showing how the analysis of Mandarin Chinese constituent structures helps to define Case Theory and how interesting generalizations concerning Chinese grammar are uncovered through verification of the theoretical predictions. Starting from the inadequacy of work by Koopman, Li, and Travis on the effect of Case directionality on word order, the book shows that a detailed study of Chinese constituent structures allows us to reduce the phrase structure component to a minimal statement concerning the position of the head in a given phrase. It argues that in a given language the constituent structures can be adequately captured by the interaction of Case Theory, Theta Theory, Government Theory, and X Theory. Longยญ standing controversies concerning Chinese basic word order are resolved by showing that underlying word order generalizations can differ from surface word order generalizations.