The volume collects a selection of papers presented at a European Colloquium held at the Universite degli Studi di Roma Tre in October 1997. It focuses on phenomena at the boundary between morphology and syntax, and provides analyses for data from the fields of both inflectional and derivational morphology and word order. Morpho-syntactic phenomena are analysed cross-linguistically and cross-theoretically, as typologically-different languages (European, Afro-Asiatic, American and Austronesian ones) are dealt with and compared according to a variety of approaches, from minimalism and lexical-functional grammar to grammaticalization theory, taking into account both synchronic variation and diachronic change. The volume is divided into three sections: I. Morphological phenomena and their boundaries, II. Morpho-syntax and pragmatics, and III. Morpho-syntax and semantics, as the interaction with the higher components of the grammar is seen as contributing to explaining variation in morpho-syntactic behaviour.