A Study Of Usability Evaluation Of Mobile Devices

Usability evaluation is developing with the interactive devices revolution, and promoting the revolution. Among these interactive devices, mobile devices are very important for us today. And, usability evaluation of fast developing mobile devices is more and more important, for ensuring many new mobile devices able to satisfy the users.However, studies of usability evaluation are mainly about PC. Usability evaluation on mobile devices has rather shorter history than on PC. What’s more, mobile devices have many different properties from PC, like small screen sizes, mobile context and etc. The differences also contribute to the usability. So, it is necessary to take the special properties of mobile devices into consideration in the usability evaluations. This paper come up with an evaluation model named T&LEE to help do this job.T&LEE model is based on traditional evaluation processes, considering and setting the special properties of mobile devices, conducting experiments mainly, and using eye-tracking technology to help collecting test data. This paper will conclude the traditional ways of usability evaluation, and introduce what, why and how to use the T&LEE model.To explain the usage and to prove the validation of the T&LEE model, this paper also designs an experiment to practice this model. As the model required, the experiment sets the special properties, recruits 24 participants, uses three mobile devices with different screen sizes as the targets, and utilizes the eye-tracking to study the relation between screen sizes and readability on read difficulty, read speed, read understanding and read stratification. The results indicate that screen sizes have influences on read difficulty and read speed, have little influences on read understanding and have relation to the users’ satisfaction. And, according to the comparisons between these results and survey results and other studies, these results are proved reasonable and the T&LEE model is proved valid as well.