“…Therefore, it is clear that a method for comparing different CVIs, which we call an evaluation of cluster validity indices, is necessary. Although little theoretical work has been done in this context, most CVI evaluation work has followed the same methodology (Chou et al, 2004;Devillez et al, 2002;Günter and Bunke, 2003;Kim and Ramakrishna, 2005;Maulik and Bandyopadhyay, 2002;Milligan and Cooper, 1985;Pal and Biswas, 1997). We call this methodology the classical methodology.…”