*5.1. Comprehensibility*

The values obtained for each question of comprehensibility indicated a positive evaluation. The responses to QC1 and QC5 had a median of 6.0 and a mean over 5.5. All the others had a median of 5.0 and a mean between 4.91 and 5.27. Item QC6 received the lowest, and item QC1 obtained the highest score. This showed that the application was easy to use and it was intuitive, but there were still small stability tracking issues that determined a slight flickering of the 3D content.

At the same time, the overall values obtained from the three surveys were very similar: Constanta (mean = 91.58), Rome (mean = 89.76), and Sulmona (mean = 90.23).
