Comparison of UX Evaluation Methods that Measures the UX Over Time

Evaluation of UX is deeply related to the concept of UX. UX cannot be evaluated directly from the quality in design but should be evaluated from the quality in use. As a result, the evaluation of UX should use different tools from what usability professionals have been using for evaluating the usability. There are two types of UX evaluation methods, one is the real-time method and another is the retrospective method based on memory. Because of the difficulty of conducting the real-time method for a long time, authors adopted the retrospective approach. We first focused on the UX Curve and revised it to become the UX Graph. Authors analyzed the accumulated data obtained so far by applying the UX Graph and concluded that the time dimension (horizontal axis of the graph) and the graph itself was not of much importance. Instead, they proposed the Experience Recollection Method (ERM) which accepts ambiguity in the time of use. In this paper, we compared UX evaluation methods, and clarified the advantages of the ERM. Author