We can conclude our study with some general remarks on its approach and findings. Firstly, we found strong evidence of path-dependency of national systems of regulation. The importance of nationally-specific factors requires in our view an in-depth analysis of each country's legal and socio-economic evolution. Secondly, the comparative analysis of legal regulation and economic development of atypical employment suggests the need to use a comprehensive research design which incorporates economic, sociological and legal theories as well as a broad set of socio-legal and socio-economic indicators (Rogowski 1997). This allows us to move beyond the mere description of employment systems of the Member States and the European Union as a whole and thus to overcome shortcomings of previous research in this field. 1 Thirdly, an interdisciplinary approach implies a shift of the analytical perspective from flexibility to efficiency in studying the impact of employment security and fixed-term contract regulation on labour markets in the European Union.