So far, it is a contested issue how such cross-national differences can be explained. This paper uses a complex theoretical framework that considers the role and interaction of cultural, political, social and economic factors for the explanation. It evaluates the theoretical assumptions on the basis of a cross-national historical study about the differences in women’s integration into formal employment from 1970 until 1990 in six European societies which represent different regions of Western Europe, Finland, Sweden, Germany, the Netherlands, Spain and Italy. The analysis of the historical development is based on document analysis, analysis of statistical data, secondary analysis of qualitative empirical studies, and on data of national surveys and of international surveys like ISSP and EVS. It also uses findings of comparative case studies in two EU projects.