The international mobility of students has considerably gained ground as a major policy in Europe over the last decades. As a result of the heightened political importance attached to international mobility, there is an enhanced need for comprehensive, up-to-date, and reliable information on the phenomenon. However, data measuring real mobility is not always available and is rarely sufficiently differentiated.This publication, and the related ACA study, has therefore a double objective. First, it investigates which data on international mobility are being compiled and made available both at the international, national and programme level. Second, it presents in one volume the student mobility data identified, and – based on an analysis of these data – it tries to depict a picture of the main trends in international student mobility into and out of 32 European countries. Next to analysing and presenting the data on international student mobility, this report also makes recommendations for the improvement of student mobility statistics both at national and international level.