This volume is a collection of studies by some of the foremost researchers of French acquisition in the generative framework. It provides a unique perspective on cross-learner comparative research in that each chapter examines the development of one component of the grammar (functional categories) across different contexts in French learners: i.e. first language acquisition, second language acquisition, bilingual first language acquisition and specifically-language impaired acquisition. This permits readers to see how similar issues and morphosyntactic properties can be investigated in a range of various acquisition situations, and in turn, how each context can contribute to our general understanding of how these morphosyntactic properties are acquired in all learners of the same language. This state-of-the-art collection is enhanced by an introductory chapter that provides background on current formal generative theory, as well as a summary and synthesis of the major trends emerging from the individual studies regarding the acquisition of different functional categories across different learner contexts in French.