Abstract-Among various statistical and data mining discriminant analysis proposed so far for group classification, linear programming discriminant analysis have recently attracted the researchers' interest. This study evaluates mult i-group discriminant linear programming (MDLP) for classificat ion problems against well-known methods such as neural networks, support vector machine, and so on. MDLP is less complex co mpared to other methods and does not suffer fro m local optima. However, somet imes classification becomes infeasible due to insufficient data in databases such as in the case of an Internet Service Prov ider (ISP) small and med iu m-sized market considered in this research. This study proposes a fuzzy Delphi method to select and gather required data. The results show that the performance of MDLP is better than other methods with respect to correct classification, at least for small and medium-sized datasets.