Usability evaluation of touch panel device by arm manipulability

We conducted one experiment for evaluating usability of touch panel by use of arm manipulability. Ten healthy male subjects participated in the experiment . They were asked to operate on touch panel in the following conditions : four operational directions (vertical , horizontal and obliquely drections), three screen tilt angles (0, 45 and 90 degrees), and three directions of the touch panel (left 45 degrees from front, front and right 45 degrees from front) . Each work time was ten seconds. As evaluation index, we used switch operational frequency , subjective operational efficiency and total moment value of the arms to compare results of arm manipulability . The results showed that good operational direction of arm manipulability accorded with those of subjective operational frequency and operational efficiency. From this study , it was found that we are capable of applying to use arm manipulability as one of touch panel evaluation index .