The French system of employment relations, both in its core (permanent contracts) and in its margins (increasingly short fixed-term contracts, self-employment, ...), has dramatically changed in the last decades. In this context, this article aims to understand how firms use various workforce management strategies to achieve flexibility at the level of a French region – the Provence Alpes-Côte-d'Azur. We adopt a renewed approach to segmentation theories, both diversified and dynamic. Firstly, in order to characterize these practices, we look not only at the the nature of the employment contract, but also at the duration of this contract, the level of remuneration and the type of work (part-time or full-time), which allows us to go beyond the internal/external market dichotomy. Then we study the evolution of this segmentation between 2006 and 2016 and we decline this segmentation of practices according to the size of the establishments. Using an exhaustive database on employment and firms in this region, we uncover the existence of four segments characterizing employment relationships in Provence Alpes-Côte d'Azur: the first, typical of the primary market, is qualified as "employment stability"; the second, on the contrary, typical of the secondary market is called "flexibility through short contracts"; the third is characterized by the use of fixed-term contracts of more than 6 months, hence the qualification of "flexibility through long fixed-term contracts"; while the fourth, more diversified, is qualified as "mixed practices". We then show that between 2006 and 2016, each segment specific characteristics seem to be reinforced, alongside an erosion of the "employment stability" segment and an increase in the "mixed practices" segment, which seems to illustrate a diffusion over the period 2006-2016 of forms of employment subsidized by the public authorities. The breakdown of the typology of practices by size of establishment generally confirmed the relevance of the four segments, although the segments "flexibility through long fixed-term contracts" and "mixed practices" could form a single segment for large establishments.