Many studies of the evolution of work times provide evidence both of converging trends within the European Union and of the persistence of significant national specificities. The level at which international comparisons are conducted will determine the conclusions of such studies, which will tend to emphasise one or other of these phenomena. Multi-level comparative approaches may be one way of going beyond this oscillation between the two interpretations. This is the aim of an ongoing research project on the connections between the established, represented and perceived aspects of working time for two occupational groups – hospital nurses and bank managerial staff – in three EU member states, Belgium, France and Spain. ; Inscrite dans le cadre d'une recherche en cours, cette étude porte sur les relations entre les trois dimensions instituées, représentées et vécues des temps de travail. Son champ est limité actuellement à deux groupes professionnels - infirmières hospitalières et cadres de la banque - et à trois pays de l'Union Européenne, la Belgique, l'Espagne, et la France.