This collection draws together recent work on constraint-based and resource-sensitive approaches to the grammar of natural languages. Some of the issues addressed are: extraction phenomena in a range of languages, the syntax of nominal phrases, the role of argument structure, defining the interface between syntax and morphology and between semantics and prosody, quantifier scope, remnant movement, construction grammar, and formal and computational aspects of grammar formalisms. This volume brings together the leading linguists, logicians, and computer scientists working on Head-driven Phrase Structure Grammar and Categorial Grammar. Derived from two recent conferences on Formal Grammar and Head-driven Phrase Structure Grammar in Aix (1997) and Saarbrücken (1998), this volume represents the most current work in these frameworks.