The United Nations Convention on the Rights of Persons with Disabilities came into force in 2008. The ICT Opportunity for a Disability-Inclusive Development Framework produced by UNESCO in 2013 formulated a development agenda for these rights, highlighting the importance of mobile devices in this development effort. For most persons with disabilities, the mobile phone is an innovation. What factors affect their satisfaction of mobile phones? The technology acceptance model (TAM) suggests that the perceived usefulness of the device will affect a person’s attitude towards the technology and the associated satisfaction. This study examines the perceived usefulness of mobile phones for persons with disabilities. A survey was conducted. The structural equation model developed showed the latent variable Perceived Usefulness, manifested as Social Function, Emergency Help, Sense of Security, positively affected user satisfaction. Implications for enhancing mobile phone perceived usefulness for users with disabilities are discussed.
Research in various areas of human-system interaction suggests the importance of examining the similarities and dissimilarities between tasks and the interfaces used to complete them. Specifically, the theory of cognitive fit suggests that human problem solvers will perform better when the data and data displays they use to complete a task match some characteristic of that task. An experiment was performed that extends the theory of cognitive fit to the realm of human performance on motor tasks. Participants completed several virtual vehicle control motor tasks that consisted of rotational and translational control components. The tasks were performed with user interfaces that either combined or separated rotational and translational control. The tasks were of two types: control of either rotation or translation changes but not both concurrently, or simultaneous control of combined rotation and translation changes. The results indicate that task performance was better when the characteristics of the interface matched the characteristics of the task. Actual or potential applications of this research include constructing ground vehicle interface controls that are designed specifically based on the characteristics of the task for which they are to be used, such as primarily driving fast and in a straight line (e.g., on a highway) versus primarily driving slowly with much turning (e.g., on a city street).
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