Abstract
The purpose of this study is to provide a measurement of user's thought process after discussing the experiment with “degree of formed mental model”, which involves a logical thinking. This paper suggests a method for mental model measurement by using kappa coefficient. We studied 107 participants based on questionnaire to measure mental models. The study showed the usability test to be more efficient because users completed it in less time than they needed to complete the questionnaire. Our results showed that users have illogical thinking when making a guess based on their mental model. This method helped understanding the potential effectiveness of mental model measurement. The obtained results indicate that despite their simplicity, these methods give relatively accurate results and are sufficient for the design process. This method contributes to the improvement of the usability of interface.
