We end this section highlighting the difficulty involved in the elaboration of a list of dimensions, as the authors adopt different designations to refer to the same dimension, or include in a single dimension concepts that other authors understand as belonging to different dimensions. For example, the designation of the “Convenience of Service” dimension, adopted in the e-SELFQUAL (Ding et al., 2011) has its correspondent in Webqual (Loiacono et al., 2002), under the name of “Relative Advantage”. On the other hand, a dimension found in one approach can represent several dimensions in others. For instance, the “Safety/Privacy” dimension, mentioned in the eTailq method (Wolfinbarger & Gilly, 2003) or the SERVQUAL Review by Li and Suomi (2009), can be divided, in our opinion, in two dimensions: “Data Safety/Privacy” and “Safety in the Transaction”.