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Controls for most technologies, including medical devices, are becoming increasingly complex, difficult to intuitively understand and don't necessarily follow population stereotypes. The resulting delays and errors are unacceptable when seconds can mean the difference between life and death. In this study participants were asked to “control” a system using a paper prototype (color photographs of controls) and then with a higher fidelity prototype of the same physical controls to determine performance differences among ethnicities and genders. No ethnic nor gender differences were found, and the comparison of paper versus higher fidelity prototypes also showed no significant differences. Thus, paper prototypes can be employed as an early device design usability tool to illustrate stereotype violations long before the first physical prototype. This will not only save money in the development and design processes, but also makes sure that even the most complex devices are intuitively understandable and operable for their basic functions.
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