Number of statements (N_STMTS): The variable is normally distributed (K–S-test with P = 0.759). The ANOVA of N_STMTS by USRSAT gave P = 0.036 < 0.05, which means that there is an indication of significant difference among the ratings of the factor. The J–T non parametric test also showed some difference (P = 0.011 < 0.05). The post hoc tests and the graphs in Figure 1 show that there is a significant difference in N_STMTS between applications rated as ‘A’ and those rated as ‘C’. The merging of the ratings B, C and D into a single rating created a new grouping of the data in two samples for which ANOVA showed some difference of the corresponding mean values of N_STMTS (P = 0.013 < 0.05). This last difference can be seen in Figure 2.