3.6 Procedure
At the beginning of the study, the participants filled in a prequestionnaire about their demographic data and their mobile phone usage history. Following this, an introduction to the task (target acquisition or reading) was given. Participants were requested to find the best trade-off between speed and accuracy. The track was explained to the users so that they got an idea of how to navigate the track. Participants received the same training of the track and were allowed to walk around the track once without the mobile. The walking speed observed during this lap was used as a control for the walking speed measures. Each participant started with the target acquisition task. After this task, the track was changed and again, the participant was allowed to walk around the track once in order to give the same training to every single participant.
3.6.1 Target Acquisition Task
The prototype was explained to the participants and they got a short training. One run contained the selection of 90 targets (e.g. 45 times with small distance and 45 times large distance) on the
touch screen using the thumb in each setting. Participants were also asked to remember the size of the targets currently being tested in order to be able to compare the four different target sizes afterwards in the questionnaire. In accordance to the counterbalanced order, every participant performed four settings and was told which setting they are going to perform next in each run. These settings contained three walking conditions with varying target sizes and one standing condition as a control, which used the smallest of the three target sizes. After the four runs, the participants were asked to fill in a questionnaire examining the participants’ accuracy and speed estimation as well as the subjective workload.
3.6.2 Reading Task
After the target acquisition task, the second phase of the user study was started examining the reading of passages of text. Therefore, the track layout was changed. After walking around the new track layout once without the mobile, the participants received a training of the scrolling behavior of the text display. As with the target acquisition task, the users performed all the four different settings, but now had to answer reading comprehension questions after reading each passage of text. For each setting, two texts were shown to the users so that every participant had to read eight passages of text in total. Having finished the reading tasks, the participants had to fill in another questionnaire comparing the subjective workload and the self-estimations regarding speed and accuracy when reading the passages of text in the three different sizes. Each participant was asked to fill in a post-questionnaire about their ideas concerning the two different tasks and the different target/text sizes.
3.6 Procedure At the beginning of the study, the participants filled in a prequestionnaire about their demographic data and their mobile phone usage history. Following this, an introduction to the task (target acquisition or reading) was given. Participants were requested to find the best trade-off between speed and accuracy. The track was explained to the users so that they got an idea of how to navigate the track. Participants received the same training of the track and were allowed to walk around the track once without the mobile. The walking speed observed during this lap was used as a control for the walking speed measures. Each participant started with the target acquisition task. After this task, the track was changed and again, the participant was allowed to walk around the track once in order to give the same training to every single participant. 3.6.1 Target Acquisition Task The prototype was explained to the participants and they got a short training. One run contained the selection of 90 targets (e.g. 45 times with small distance and 45 times large distance) on the touch screen using the thumb in each setting. Participants were also asked to remember the size of the targets currently being tested in order to be able to compare the four different target sizes afterwards in the questionnaire. In accordance to the counterbalanced order, every participant performed four settings and was told which setting they are going to perform next in each run. These settings contained three walking conditions with varying target sizes and one standing condition as a control, which used the smallest of the three target sizes. After the four runs, the participants were asked to fill in a questionnaire examining the participants’ accuracy and speed estimation as well as the subjective workload. 3.6.2 Reading Task After the target acquisition task, the second phase of the user study was started examining the reading of passages of text. Therefore, the track layout was changed. After walking around the new track layout once without the mobile, the participants received a training of the scrolling behavior of the text display. As with the target acquisition task, the users performed all the four different settings, but now had to answer reading comprehension questions after reading each passage of text. For each setting, two texts were shown to the users so that every participant had to read eight passages of text in total. Having finished the reading tasks, the participants had to fill in another questionnaire comparing the subjective workload and the self-estimations regarding speed and accuracy when reading the passages of text in the three different sizes. Each participant was asked to fill in a post-questionnaire about their ideas concerning the two different tasks and the different target/text sizes.
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