We presented each tester a set of sample tasks, one task at a time. Throughout the test, we watched each volunteer as they completed the sample tasks, and noted any problems they had with the software. We asked the testers to speak aloud during the usability test, to describe what they were looking for; if they were looking for the “Print” button, they should say, “I’m looking for the ‘Print’ button.” After each set of tasks, we took a “comment break” so participants could share their thoughts about the software and the problems they encountered.