TARGET BASED ANALYSIS - A MODEL TO ANALYSE USABILITY TESTS BASED ON MOBILE EYE TRACKING RECORDINGS

This paper addresses the usability evaluation of tangible products by video analysis. Compared to conventionally conducted videos from the third-person perspective, mobile eye trackers allow to capture the user-product interaction from the first person view, and to measure the location of the gaze. Knowing where a user looks, enables to analyse the interaction more granular, and to draw conclusions about cognitive processes. To address the potential of mobile eye tracking for usability tests of tangible products, we introduce the Target Based Analysis (TBA) - a model structuring the video analyses. On the basis of the location of the gaze, the model decomposes each interaction step in the four reoccurring phases: find, recognize, handle and prepare/wait. The model has been tested in a usability study of two 3D printers with 46 participants. It was possible to map each user-product interaction, to generate comprehensive overviews allowing to quickly identify critical steps, and to compare between tasks, user groups, and products. In the future, an integration of eye tracking measures, such as fixation durations, could further amplify the quantification of user-product interactions.