Defining Acceptable Interaction for Universal Access

摘要

Many new assistive input systems developed to meet the needs of users with functional impairments fail to make it out of the research laboratory and into regular use by the intended end users. This paper examines some of the reasons for this and focuses particularly on whether the developers of such systems are using the correct metrics for evaluating the functional attributes of the input technologies they are designing. In particular, the paper focuses on the issue of benchmarking new assistive input systems against a baseline measure of useful interaction rate that takes allowance of factors such as input success/recognition rate, error rate, correction effort and input time. By addressing each of these measures, a more complete understanding of whether an input system is practically and functionally acceptable can be obtained.