At first sight, parliamentary participation in Economic and Security governance within the European Union (EU) do not appear to have much in common. In particular, in the economic and monetary area many competences have been transferred to the EU level or, at least, the EU coordinates Member States policy, By contrast, the security area is still much more centred and operated at Member States level. Building on the presentations by previous speakers, my intervention will seek to highlight similarities and differences across national and European parliaments in these two policy areas. It will assess whether some best practices developed in one field could potentially be used in the other area to reduce the information asymmetries national parliaments suffer from vis-à-vis their governments. Additionally, the potential added value of inter-parliamentary cooperation as a means for European and national parliaments to gain information will also be examined.