Given the new European institutional environment for education and training, policy and methodology for evaluation have become closely interwoven and stakes have been raised. This emerging situation calls for a robust reappraisal of existing comparative evaluation data and systems in the light of the perceived needs of European countries and of the specificity of European policies. Educational evaluation in Europe is not meant to compare results in the usual sense of the word but rather to help set global policy objectives and provide data to see if those are reached within national contexts. Is it really possible to do this without developing a 'unified' European understanding and methodology of evaluation? To what extent can existing national and international data be used for the purpose, knowing that in some instances they measure aspects of education which are either not relevant for or are contrary to the educational objectives of the construction of the Union? What are the alternatives? What are the consequences for education and for assessment research in Europe?