Constructing usability evaluation criteria is the most important element, which is necessary to design and evaluate systems in HCI. Nevertheless, since ubiquitous computing is on its early stage and covers an overly large scale, it is not easy to iden...
Constructing usability evaluation criteria is the most important element, which is necessary to design and evaluate systems in HCI. Nevertheless, since ubiquitous computing is on its early stage and covers an overly large scale, it is not easy to identify usability factors. In this paper, 1) an overview of the interactive design process was presented in order to construct a ubiquitous computing environment on the campus, 2) usability factors for mobile ubiquitous computing was established, 3) and usability evaluation was conducted using those criteria.In study 1, an environment analysis was conducted to investigate prospective users’ understanding of the general ubiquitous computing. In study 2, usability experts conducted heuristic evaluation of a prototype application in order to improve the current system and to search for the direction of effective evaluation. In study 3, a contextual inquiry for feasible scenarios on the campus was carried out. In study 4, based on those empirical data, usability factors for mobile ubiquitous computing was extracted. While eight factors were the same as the current factors in HCI field, the other eight were the unique components for ubiquitous computing. Finally in study 5, usability evaluation was conducted according to information presentation types (pull or push). As a result, 60% of participants preferred pull way to push way, which was different to the antecedent results. Peoples’ selection of the information presentation method differed according to an individual attitude to technology. Results also showed significant differences in the following factors between two conditions: simplicity, efficiency, privacy, hands-free, feedback, integration, and controllability.As a result of this study, a framework of usability evaluation for ubiquitous computing was constructed by users through the empirical studies. In a field study, it was demonstrated that interactive design was effective to develop ubiquitous computing services, and that the conditions of several usability factors were changed according to the information presentation types.