Information exchanges between authorities located at different levels of administration, and in different Member States, have always constituted a central feature of European Union (EU) governance. Nevertheless, the increasingly pervasive phenomenon of interoperable information-sharing, where information systems pertaining to different policy fields are joined up to facilitate exchanges of (personal) data, generates new structural challenges to the EU from a political, legal, and indeed constitutional perspective. [---] (Samal teemal artiklid erinevatelt autoritelt lk. 71-226).