Recently, several usability studies and tools were developed for usability analysis of mobile applications. Gerharz and Muller analyzed the usability of indoor
navigation application using quantitative study with SPSS tool (Statistical Package for the Social Sciences). Qualitative data were collected by means of post-test
questionnaires that are important part of qualitative analysis but their results may be sometimes misleading because they cannot be compared with the user behavior
during the study. Balagtas-Fernandez et al. present methodology and framework to simplify usability analysis of mobile applications. The framework is based on
programmatic support of log file generation by the tested application and visual analysis of this log. Similar approach present Au et al. in . They propose the
Handheld device User Interface Analysis (HUIA testing framework) that is also based on log file generation by the application. These log files are then compared between
each other or with the optimal behavior. They can be also used in hot-spot analysis of particular component. Both approaches are platform dependent (Android resp. .Net)
and they work with log files only. While the analysis of the log file is important, it just tell us what the user did but it does not tell us why the user did it. We think that such deeper understanding is not possible without audio/video recording or at least without observer annotations that are missing in both approaches.