## 3 Results
### User Interactions  
The project included a literature review on interactive digital technology and narrative for DCH, identifying design principles and audience needs for engaging applications [75; 76; 77; 78; 79; 80; 81; 82]. \"Memories of Kellie\" aimed to deliver emotive, contextualized narratives through a visually appealing interface, engaging users with interaction. The prototype was built using Unity(r), and featured a dynamic interface, audio soundscape, and interactive digital environment (Figure 6). Narrative elements were conveyed through interactive panels, revealing historical information as users explored the environment, aided by prompts and feedback mechanisms. \begin{table}
\begin{tabular}{p{56.9 pt} p{113.8 pt} p{113.8 pt} p{113.8 pt} p{113.8 pt}} \hline
**AR Heuristics** & **User Interaction** & **Action Result** & **Issues** & **Score** \\ \hline Equitable Use & Multimodal: Visual figures, auditory music. & Inclusive accessibility for diverse users. & None & 5 \\ \hline Flexibility of Use & Supports handheld/table use; adaptable to different scenes. & Adaptable to user needs and environments. & None & 5 \\ \hline Simple and Intuitive Use & QR codes control figures; inbuilt tutorials. & Easy, intuitive interaction; potential for information overload. & Information overload unclear & 3 \\ \hline Perceptible Information & Virtual figures aligned with QR codes; labeled interface. & Clearly perceptible; distinguishable elements. & None & 5 \\ \hline Tolerance for Error & Hand blocking pauses figure; potential for undo. & Self-correction evident; prevention and warnings needed. & Unclear alert and notification system & 4 \\ \hline Low Physical Effort & QR code manipulation with simple gestures. & Controllable without complexity. & None & 5 \\ \hline Size and Space for Approach & QR codes and elements comfortably reachable; scalable for devices & Comfortable reach and manipulation. & None & 5 \\ \hline \end{tabular}
\end{table} 
Table 5: Universal Design Principles for AR design and evaluation, and their seven heuristics by [PERSON] and [PERSON], applied to the Cham AR app [65]. Evaluation Method and Results  
The application was tested by 16 users of varying ages and technological confidence. After using the application for about 10 min, participants completed a questionnaire assessing the design themes' goals and their impact on the user experience (see Table 6). Design principles were categorized into four themes: design fundamentals, functionality, storytelling, and atmosphere. Fifteen out of sixteen participants found the application intuitive and appropriately timed, with suitable content levels. Most feedback for improvement focused on the storytelling aspects, such as the information format and animation pace. Overall, \"Memories of Kellie\" was engaging, with 14 participants expressing a desire to visit the site after using the application. The open ended final question received some interesting responses:  
Q19: Is there anything else you would like to add about your experience of using Memories of Kellie? _\"No other than to note again that I hadn't heard of Kellie before, and I would now like to visit\"_  
_\"Absolutely loved it! Loved the fairytale/dream feel to it, thought it made it seen more like a memory and less like a history lesson\"_  
_\"Would love to see it evolve into a less linear version with more interaction\"_  
_\"Really enjoyed it and felt I learned something\"_  
_\"Can't wait to visit the actual place in real life!\"_  
_\"Would have loved to see the interior of the Castle to add to the experience\"_  
_\"It said there was a picture inside the castle, I would like to know what else I could see inside\"_  
_\"I would like to see a more accurate garden and the inclusion of greater detail in the information\"_  
_\"It is a good advert for the Castle, and I can't wait to visit again!\"_  
_\"It is a faster for better things to see--a good advert for the castle and grounds\"_  
Figure 6: Four screenshots from the Memories of Kellie—desktop VR application [83].