This paper offers an overview of the work that has been done within the Phonologie du français contemporain : usages, variétés, structure (PFC) research programme. We first critically assess the relation between phonological research and data. We then move on to describe PFC's methodology and the coding schemes that have been devised for the analysis of schwa and liaison. We finish off by showing how the PFC programme makes a valuable contribution to our understanding of the phonology of French, by widening the scope and breadth of empirical descriptions and by offering new insights into theoretical problems such as the analysis of liaison or the role of usage frequency in grammar.