## 6 AR Content Usability Evaluation and Results
### Result  
Figure 20 shows the results of the UMUX survey conducted using the document manual and AR content for the air spring, where group A had an overall average score of 73.66 across the four items, and group B scored 81.56, resulting in a 7.9-score increase for the AR content, which indicates approximately a 10% improvement in learning efficiency; specifically, Group B scored 85.00 for U1, \"This content's capabilities meet my requirements\", which is 10.83 scores higher than group A's 74.17, reflecting a 14.6% improvement in meeting requirements; 80.83 for U2, \"Using this content is a frustrating experience\", which is 5.83 scores higher than group A's 75.00, indicating that the AR content is approximately 7% less frustrating to use; 78.75 for U3, \"This content is easy to use\", which is 9.17 scores higher than group A's 69.58, suggesting a 13.1% improvement in usability; and 81.83 for U4, \"I have to spend too much time correcting things with this system\", which is 5.95 scores higher than group A's 75.88, showing a 7% reduction in the time required to correct issues, though it is worth noting that U3 received the lowest score among the AR content items, likely due to users being unfamiliar with the operation and touch controls of AR content in a mobile environment, as well as the brief instructions and lack of a detailed user manual. Figure 21 presents a graph showing the average scores of categories from the CSUQ results conducted using the document manual and AR content for the air spring, where the overall average score across the four categories and 19 items of the CSUQ survey was 73.29 for group A and 80.83 for group B, indicating that the AR content scored 7.54 scores higher than the document manual; specifically, in the system usefulness category, group B scored 84.95, which is 9.74 scores higher than group A's 75.21, reflecting an approximate \begin{table}
\begin{tabular}{c c c} \hline \hline
**Classification** & **Detailed Values** & **Remarks** \\ \hline Total participants & 80 & \\ \hline Average age & 39.9 & Standard deviation: 11.7 \\ \hline Average years of employment & 14.8 & Standard deviation: 10.6 \\ \hline Age & 20–29 Years & 21 people \\ distribution & 30–39 Years & 18 people \\  & 40–49 Years & 20 people \\  & 50–59 Years & 21 people \\ \hline Gender & Male & 65 people \\  & Female & 15 people \\ \hline Rail vehicle & High-speed rail & 57 people \\ classification & General rail & 23 people \\ \hline Maintenance part & Light & 41 people \\  & Heavy & 39 people \\ \hline \hline \end{tabular}
\end{table} 
Table 5: The general information of survey participants. 10% increase in usefulness; in the information quality category, group B scored 80.48, which is 6.55 scores higher than group A's 73.93, showing an approximate 8% improvement in information quality; in the interface quality category, group B scored 70.42, which is 2.78 scores higher than group A's 67.64, indicating an approximate 4% enhancement in interface quality; and, finally, in overall usability, group B scored 81.67, which is 11.25 scores higher than group A's 70.42, representing the largest increase and confirming that the AR content led to an approximate 16% improvement in overall usability. Table 6 presents the results of the CSUQ survey, showing the average and standard deviation of the 19 items across the 4 categories. When using this AR system, users are expected to feel comfortable (87.08) and be able to quickly complete tasks and work efficiently (85.83), leading to a rapid improvement in productivity (85.83). Overall, users are likely to experience satisfaction (81.67) with the usability. However, concerning information quality, it might be difficult to recover from mistakes in the AR system (73.33). Regarding the interface, there are issues with technical explanations of interface usage methods and  
Figure 21: CSUQ score of the air spring AR content. Figure 20: UMUX score of the air spring AR content. insufficient functionality and performance (74.17), leading to discomfort (69.17).