This work starts with results obtained in [4] where quality attributes to be considered in operative web projects were analyzed and evaluated, mainly for the "Functionality and Content" feature of sites and applications of electronic commerce (e-commerce). The evaluation process applied to sites from the studies of 2000 and 2004 [2,4] produced a concentrated binary matrix, which has been processed in previous works [3] with multivariate approaches that in turn have provided useful information that allowed the identification of a precise relationship between attributes. Aiming to obtain a group of quality attributes where it is possible to identify inter-relations or common features between the variables that compose each class, the binary table from the previous study has been revisited, and has been processed with statistical cluster analysis. Ultimately, hypothesis tests are proposed to infer the behavior of the population of Argentinean e-commerce sites.