# Design, Implementation, and Field Testing
## 5 Field Study
### Usability Survey Result  
At the end of the field test, we asked the seven participants to complete a survey. This survey has 13 questions where the participant could choose one of four answers: Yes Much/Often; Yes Somewhat; No Not Much; and No Not At All. The participants were also encouraged to provide written comments regarding their experience. The summary of the survey result is provided in Figure 9. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Room** & **Total of Registered** & **Daily Average Before/After** & **Total NCA** & **Total Number** \\
**Number** & **Time (Minutes)** & **Lease Mechanism** & **Time (Minutes)** & **of NCAs** \\ \hline
1 & 316.08 (daily mean 4.95) & 3.02/18.78 & 16.74 & 427 (daily mean 5.3) \\
2 & 311.56 (daily mean 2.64) & 1.56/7.11 & 2.04 & 575/7.2 \\
3 & 89.16 (daily mean 1.11) & 0.88/5.23 & 19.26 & 345/4.3 \\
4 & 171.24 (daily mean 2.14) & 1.14/6.80 & 30.54 & 620/7.8 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Summary of the field study result. NCA is short for non-compliant activity. Figure 8: The total registered time per day during the entire 80-day field study in four resident rooms. The arrows in the figures indicate the day when the lease-based mechanism was activated. Figure 9: Survey result. Question 1 is: \"Did you mind wearing the smartwatch/carrying the smartphone?\" Regarding this question, two participants indicated that to some degree they feel that it is a burden to wear the smartwatch and/or carry the smartphone, and five participants did not mind doing so. This suggests that the far majority of participants consider this system requirement acceptable. However, a non-negligible portion of participants do consider this requirement a burden. This result is inline with our observation and we have plan to address this issue. Question 2 is: \"Did wearing the smartwatch itself interfere with your job duties?\" Regarding this question, only one indicated that wearing the smartwatch interfered with her job duties to some extend. The other six participants were not bothered. Question 3 is: \"Did the manual registration step interfere with your job duties?\" For this question, one indicated that it did interfere very much, two reported it interfered somewhat, and four (i.e., more than half) did not find it interfere with her job duties. Again, because close to half of the participants reported that the registration step interfered with their job duties, we consider it a high priority to develop a biometric-based method to automatically register a participant with PACTS in the near future. Question 4 is: \"Did you ever have problems getting the phone to 'wake up', connect to the internet, and/or getting the watch face activated/ to the correct screen?\" For this question, four out of seven reported that they encountered this problem sometimes. This shows that indeed the use of a smartphone to bridge the communication between the smartwatch and the KinectServer is problematic. We have plan to switch to Android smartwatch that can connect to the KinectServer directly via WiFi to eliminate this problem. Question 5 is: \"Did the smart watch/phone maintenance (picking it up in the morning, charging, taking on and off, etc.) interfere with your job duties?\" Regarding this question, only one participant indicated that these activities interfered with her job duties somewhat. Five participants felt the maintenance activities did not interfere with their job duties at all. Question 6 is: \"Did the vibrating watch help you know when you were using poor body mechanics during bedside care?\" For this question, all seven participants indicated that the vibration-based alert helped them to realize that they made a mistake when they used poor body mechanics. Five of them strongly agreed that it helped. Even though it is a small sample, the survey did confirm that our design for alert delivery method is useful.