FIGURE 1.

The number of closed questions (n = 17) in each round of user testing which achieved various measures of overall performance. As described in the methods section, a response was scored as “found with ease” if the participant located at least part of the required information. If the participant took more than 60 seconds or required 2 or more prompts, it was scored “found with difficulty.” Responses were scored as “understood” if the participant interpreted the information located to give the complete prespecified answer.