Although the increase in female labour force participation is a fairly widespread trend, there is still a considerable diversity of situations across Europe from north to south. To identify the factors that may explain these differences, Olivier Thévenon uses data from the European Labour Force Surveys (EU-LFS) carried out in 14 countries between 1992 and 2005. For comparable educational levels and family situations (e.g. number of children, age of youngest child, single-parent status), the labour market behaviours of European women (inactive, short or long part-time work, full-time work) are very diverse. This diversity reflects differences in government policies targeting working mothers (help with reconciling work and childcare, encouragement to leave the labour market or to work part-time, etc.). In some contexts, women choose to postpone childbirth or to remain childless in order to pursue a working career. The increase in women's labour force participation may thus entail a certain polarization of behaviours.