Statistical comparison of differences in usability feedback among males and females was verified using the Mann-Whitney non-parametric procedure. Groups means were used for the comparison.
Comparisons of usability feedback between male and female target users were indicative of a more positive attitude toward the prototype among women. The number of problems detected by males was slightly higher than the number of problems encountered by females. In the qualitative side, no apparent differences in feedback were observed.
This research question took only users into consideration. The small number of experts in the study (5) did not allow a gender comparison among experts.
One aspect to consider in this research question that could limit the external validity of these results is the fact that the observer was a male. This might have introduced a bias in the interaction between the observer and the participants in either direction, depending on the personality of the observer. This aspect is similar to the issue of cultural identity presented earlier.