## 3 Research Process and Methods
### Establishing a QFD Design Factor Mapping Model
\begin{table}
\begin{tabular}{c c c} \hline
**Index** & **Absolute Weight (W\({}_{j}\))** & **Relative Weight (W\({}_{k}\))** \\ \hline Layout & 3.9146 & 0.1247 \\ Module Partitioning & 2.5422 & 0.0810 \\ Color scheme & 1.2810 & 0.0408 \\ Font Style & 1.3940 & 0.0444 \\ Icon Design & 1.7438 & 0.0556 \\ Contrast & 3.4995 & 0.1113 \\ Status prompt & 5.3846 & 0.1713 \\ Dynamic Information & 4.3896 & 0.1397 \\ Illustration and decoration & 2.5693 & 0.0818 \\ Emotional language & 2.2760 & 0.0724 \\ User Rewards & 2.0173 & 0.0641 \\ Feedback Mechanism & 5.2574 & 0.1672 \\ Convenience of operation & 4.8325 & 0.1538 \\ \hline \end{tabular}
\end{table} 
Table 13: Weighting of design requirements. Figure 7: QFD mapping model. Source: own processing. First, among all the design elements, module partitioning, state hints, dynamic information and feedback mechanism have high weight values in the three dimensions of function, vision and interaction, which are the key elements for interface design optimization. Among them, state cues (Wj = 5.3846, Wk = 0.1713) had the highest weight, which was demonstrated by [PERSON], [PERSON], et al., who proved that the P300 amplitude is positively correlated with the clarity of the state cues. This suggests that clear and intuitive state cues are crucial for users to receive feedback on their operations [72]. Dynamic information (Wj = 4.3896, Wk = 0.1397) plays an important role in improving the immediacy of information interactions and the smoothness of operations [73]. The feedback mechanism (Wj = 5.2574, Wk = 0.1672) is a central factor in the user's perception of the interaction quality and system response. In addition, the rationality of module division (Wj = 2.5422, Wk = 0.0810) directly affects the layout logic of functional modules and the user's ability to understand the interface information. Therefore, functional optimization should first focus on the above key elements in order to improve the user's basic operation experience. Second, color scheme, font style and contrast are the core elements of visual design; they are crucial for improving the attractiveness and readability of the interface. Among them, contrast (Wj = 3.4995, Wk = 0.1113) has a higher weight, indicating that the optimization of contrast plays a key role in the display of the information hierarchy and the visual experience [74]. The role of the color scheme (Wj = 1.2810, WK= 0.0408) and font style (Wj = 1.3940, WK = 0.0444) in enhancing the aesthetics and consistency of the interface should not be ignored. Therefore, the optimization of visual design should focus on the coordination of contrast, color schemes and fonts to ensure that users can quickly identify information and perceive the aesthetic value of the interface [74]. Finally, dynamic information and feedback mechanisms have higher weights in the interaction experience, Wj = 4.3896, Wk = 0.1397 and Wj = 5.2574, Wk = 0.1672, respectively, suggesting that immediate feedback and interaction guidance are crucial to user experience. The optimization of interaction design should focus on the dynamic presentation of information and the timeliness of responses to ensure that users can receive clear feedback during the operation process, so as to improve user engagement and satisfaction [75]. In general, the design of the ordering interface should be based on functionality, combined with visual appeal and interactive fluency. Module partitioning, status prompts, dynamic information and feedback mechanisms are the core elements of optimized interface design, which should focus on three aspects: function, vision and interaction. Meanwhile, the importance of color scheme, font style and contrast in the visual dimension also indicates that interface optimization needs to focus on the overall coordination of design elements.