In the beginning, each participant filled in a background information questionnaire, and a brief stereoscopic vision test was conducted with the equipment used in the actual test. The vision test included three circles in different colors that were at different depths, and had the same disparity value as the private, public, and background layers in the test tasks. The user had to select which circle was the closest and which was the most distant. As a warm up task, different mobile UI visualizations were shown to the participants to get them familiar with the autostereoscopic screen. After this, the participants were shown the UI layout and they experimented with the interaction. The users were asked to swipe through the gallery to view the images, tap to zoom, and use long press to switch images between private and shared layers with each design (P, D, D+F, F). The photos were shared with a researcher sitting at the same table and operating another mobile phone. Users then rated the designs (with scale 1-5), selected their favorite one, and provided other comments. During this, the users were able to switch between the different visualizations as well as between 2D and S3D visualization, which they were also asked to compare. The users were encouraged to think aloud during the study, and a researcher took written notes.