Case Studies - Measuring the User Experience: Collecting, Analyzing, and Presenting Usability Metrics - page 251

Table 10.3 Time by conditions

Time (sec)
Mean Mean Min Max

RS (attempt time) 28.66 28.66

0.05

153.80

RT (attempt time) 5.87 5.87 2.23 28.14

LS (attempt time) 17.14 17.14 2.56 113.13

LT (attempt time) 5.54 5.54 2.172 55.02

Task completion time 94.71 94.71 32.61 270.47

Table 10.3 Time by conditions.

SATISFACTION
Participants filled out a questionnaire regarding their experience with the self-
capture task after each task. The questionnaire consisted of six questions with a
five-point semantic distance scale. Mean ratings across all participants are sum-
marized in Table 10.4 . Overall, the participants responded very positively to the
self-capture tasks.

Table 10.4 Post-task satisfaction questions and ratings

Mean
Ratings Questions Scales

Q1 How comfortable were you with

the interaction with the fingerprint
device?

4.24 1-uncomfortable

5-very
comfortable

Q2 How did the time it took to have

your fingerprint recorded compare
with what you expected?

3.32 1-much more

than expected
5-a lot less than
expected

Q3 How would you rate the difficulty

in positioning yourself so that your
fingerprint could be recorded?

1.59 1-not difficult

5-very difficult

Q4 It was clear when the fingerprint

process began.

3.51 1-unclear

5-intuitive

Q5 It was clear when the fingerprint

process ended.

3.94 1-unclear

5-intuitive

Q6 How confident are you that you

completed the fingerprint task as
intended?

4.24 1-not confident

5-certain

Table 10.4 Post-task satisfaction questions and ratings.

During the discussion after the test, we asked each participant if the overlay
assisted the self-capture process. Forty-six participants (57.5%) found the over-
lay helpful in guiding them to better position their hand on the scanner; six of