Chapter 8 Combined and Comparative Metrics
Usability data are building blocks. Each piece of usability data can be used to create new metrics. The raw usability data might be task completion rates, time-on-task, or self-reported ease of use. All of these usability data can be used to derive new metrics that were not previously available, such as an overall usability metric or a usability scorecard. Two ways to derive new usability metrics from existing data are (1) by combining more than one metric into a single usability measure and (2) by comparing existing usability data to expert or ideal results. We will review both methods in this chapter.
8.1 SINGLE USABILITY SCORES
In many usability tests, you collect more than one metric, such as task ...
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