A Study of Usability Evaluation Method Based on Usability Task Analysis with Classified Quality Elements

The aim of this study is to propose the new usability evaluation method which allows us to find “attractive factors” of products and reflect them on the target product in the user centered design (UCD) process. In this paper, after a detailed explanation of the usability evaluation method based on usability task analysis with classified quality elements, the results of evaluation of Bluray recorders’ remote controls to verify this method is mentioned. First, user requirements were obtained. Next, they were classified into quality elements (like “Attractive Quality” and “Must-Be Quality”, etc.) on trial, by looking into the relationship between good and bad points of products. As a result, user requirements were classified into three groups of quality elements (+element, ±element and -element). And then the key points to improve the target product were specified. This method is effective for usability evaluation and can be used for UCD.