1 . What is the visibility space in the interface
Visibility space in the interface is to show user the state of interface and other possible actions. Also, it tell us what interactions are available to be used.
2. Percentage of the usability interface
Redesigning user interfaces on the basis of user testing can substantially improve usability. In four case studies, the median improvement in overall usability was 165% from the first to the last iteration, and the median improvement per iteration was 38%. Iterating through at least three versions of the interface is recommended, since some usability metrics may decrease in some versions if a redesign has focused on improving other parameters.
3. How many users prefer the navigation icons on the right top/left top/ center / bottom?
According to a survey, approximately 2.55% users prefer the navigation icons on the right top while there is around 2.04% of users who prefer using the left bottom navigation icons. Other than that, 0.43% of users prefer it in the center of the display screen and 0.16 % of the users prefer the navigation buttons at the bottom of the display screen.
