“…Several studies have recently focused on evaluation of AS using different techniques. The related work can be classified into three broad categories following the classification of (Huart, Kolski and Bastien 2008): empirical approaches (Mitrovic, 2001;Gena et al, 2001;Goren-Bar et al, 2005;Soui, 2007;Porayska-Pomsta et al, 2008;Weibelzahl and Chihaia, 2008), expert approaches (Magoulas et al, 2003;Gena & Torre, 2004;, and analytical approaches (Lebodic, 2005).…”