Usability, with an emphasis on user-centered design, pays attention to user experience. It is based on usefulness, convenience, friendliness, and security so as to raise brand trust and develop users’ loyalty. Usability Evaluation focuses on facts and the establishment of appraisal system. It makes clear the user-centered concept, research and analyse in users’ case.
While usability testing, as the most important method of usability evaluation, objectively quantifies the users’ feelings towards using various attributes and procures the design situation effectively so as to achieve high-level and detailed design.