“…Numerous approaches have been applied to feature selection, e.g. generic algorithms (Van Coillie et al, 2007;da Silva et al, 2009;Lee et al, 2006), artificial neural network (ANN) (Saravanan and Ramachandran, 2010;Chakrabarti, 2008;Glezakos et al, 2009), Tabu Theory (Wang et al, 2010;Wang et al, 2009), branch-and-bound algorithm (Nakariyakul and Casasent, 2007;Chen, 2003), Fuzzy C-means Algorithm (Francesco, 2003) and SOM (Laaksonen et al, 2004). However, these approaches are not used for processing qualitative information.…”