The study demonstrated that NARA is both a straight-forward and cost-effective method to develop user requirements and can be used throughout the development cycle.

No abstract

Cellular telephones provide a portable means of communication and facilitate many communication tasks in daily life. Persons with disabilities, however, have limited access to these devices, which may be due to product designs that do not always consider their needs. Usability evaluations can identify the needs and difficulties when using cellular telephones, and those with disabilities are also likely to benefit from focused evaluations. The usability of cellular telephones was investigated among those with visual and upper extremity disabilities. Both objective and subjective evaluation methods were used to determine the effects of several telephone display and keypad design features. Lateral key pitch is reported here. Objective and subjective measures were similar among participant categories, with the 12 mm and 13 mm levels of lateral pitch generally the best across all measures. Results suggest keypad design features to consider when designing accessible cellular telephones. Universal design implications are also discussed.