This paper studies three thematic markers (TMs) in informal written French: pour ce qui est de, au niveau (de) and en matière de. We will demonstrate that they have different syntactico-semantic and discourse-functional properties and that the exact function of the TM construction results from the interplay between the inherent properties of the TM and the specific syntactic construction it appears in. We will demonstrate that TMs do not only introduce the aboutness-topics, but that they can also establish the frame in which the main clause holds or functions.