This paper combines the results of desk and field research about assessment methods that were held in the frame of a European project - CRITON (www.criton.eu) – is a Lifelong Learning Programme funded by European Comission. The aim of the undertaken research was the study of different assessment methods used in e-learning environments around Europe. The results of this research lead both to the definition of the most widely used assessment practices in 6 different European countries (Germany, Austria, Lithuania, Greece, Finland and Sweden) and to the role of these practices in the prediction of e-learners’ final performance. The main outcome of the project is a web based platform that records e-learners’ progress and provides tools for identifying students at risk.