1) Coordination of social security systems aims to facilitate mobility within the EU by linking national systems to prevent loss of benefits for migrant workers.
2) Key actors in coordination include the European Commission, Council, Parliament and Administrative Commission. The Administrative Commission deals with administrative questions and uniform application.
3) Coordination faces administrative challenges at national levels including organization, staffing needs, and preparation to handle international cases according to the principle of good administration. Electronic data exchange helps address some challenges.