“…Depending on the research objectives as well as on data availability, some studies distinguish between going concern and non-going concern opinions (Koh and Killough, 1990;Lenard et al, 1995Lenard et al, , 2001, others between fraud (or falsified financial statements-FFS) and non-fraud (non-FFS) (Bonchi et al, 1999;Spathis et al, 2002), and others distinguish in general between qualified and unqualified opinions (Laitinen and Laitinen, 1998;Spathis et al, 2003;Gaganis et al, 2005aGaganis et al, , 2005bDoumpos et al, 2005;Pasiouras et al, 2006). Over the years various techniques have been proposed such as discriminant analysis (Koh and Killough, 1990), probit analysis (Dopuch et al, 1987), logit analysis (Laitinen and Laitinen, 1998;Spathis, 2002), artificial neural networks (Lenard et al, 1995;Fanning et al, 1995;Fanning and Cogger, 1998), hybrid systems (Lenard et al, 2001), multicriteria decision aid Pasiouras et al, 2006), nearest neighbours (Gaganis et al, 2005a), probabilistic neural networks (Gaganis et al, 2005b), and support vector machines (Doumpos et al, 2005). Most of these studies achieve satisfactory classification accuracies and conclude that the models could be useful to auditors in forming their opinion.…”