This issue is dedicated to Regulation (EC) 883/2004 of the European Parliament and of the Council of 29 April 2004 on the coordination of social security systems, which will coordinate social security schemes in cases where people use their right to free movement. The regulation is not brand new; it is already five years old. However, it could not come into force because a detailed implementing regulation is necessary for its implementation. Af er Regulation 883/2004 was adopted, work started on making this regulation, which now seems to be almost complete.