## 3 Case Validation
### Decision Making Based on Conflict Degree  
#### 3.5.1 Analysis of the Conflict Degree and Product Sales  
The conflict degree between users and designers regarding product attributes can have a profound impact on product sales. Designers strive for innovation and aesthetics, dedicating themselves to adding novel features and unique design elements to products. However, these innovations may conflict with users' needs and expectations, as users often prioritize practicality and functionality.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Design Scheme** & \(\mathbf{CS_{1}}\) & \(\mathbf{CS_{2}}\) & \(\mathbf{CS_{3}}\) & \(\mathbf{CS_{4}}\) & \(\mathbf{CS_{5}}\) & \(\mathbf{CS_{6}}\) & \(\mathbf{CS_{7}}\) \\ \hline \(DP_{1}\) & [0.74, 0.21] & [0.72, 0.23] & [0.80, 0.15] & [0.48, 0.47] & [0.74, 0.21] & [0.82, 0.13] & [0.68, 0.22] \\ \(DP_{2}\) & [0.51, 0.44] & [0.95, 0.05] & [0.67, 0.28] & [0.66, 0.29] & [0.51, 0.44] & [0.95, 0.05] & [0.40, 0.55] \\ \(DP_{3}\) & [0.95, 0.05] & [0.88, 0.07] & [0.95, 0.05] & [0.95, 0.05] & [0.95, 0.05] & [0.40, 0.55] & [0.95, 0.05] \\ \(DP_{4}\) & [0.55, 0.40] & [0.64, 0.31] & [0.47, 0.48] & [0.71, 0.23] & [0.81, 0.14] & [0.69, 0.26] & [0.54, 0.41] \\ \(DP_{5}\) & [0.40, 0.55] & [0.40, 0.55] & [0.71, 0.24] & [0.46, 0.49] & [0.78, 0.17] & [0.83, 0.12] & [0.48, 0.47] \\ \(DP_{6}\) & [0.72, 0.23] & [0.56, 0.39] & [0.40, 0.55] & [0.40, 0.55] & [0.40, 0.55] & [0.78, 0.17] & [0.52, 0.43] \\ \hline \hline \end{tabular}
\end{table}
Table 10: Designer evaluation matrix.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Design Conflicts** & \(\mathbf{CS_{1}}\) & \(\mathbf{CS_{2}}\) & \(\mathbf{CS_{3}}\) & \(\mathbf{CS_{4}}\) & \(\mathbf{CS_{5}}\) & \(\mathbf{CS_{6}}\) & \(\mathbf{CS_{7}}\) \\ \hline \(DP_{1}\) & [0.67, 0.28] & [0.57, 0.36] & [0.78, 0.18] & [0.63, 0 When designers excessively pursue innovation, and product attributes deviate from users' actual needs, it may lead to a decline in sales. Users are generally more willing to purchase products that meet their needs, rather than those with unique appearances alone. Therefore, conflicts in product attributes between designers and users may negatively impact sales.  
However, some successful products manage to strike a balance by combining attractive design features with functionality, meeting a wide range of user needs. Such products often achieve good sales performance in the market. Hence, product sales in relation to the conflict degree of product attributes depend on successfully integrating design innovation and user needs, directly influencing the product's market performance.  
This section explores the impact of user-designer conflicts on product sales based on the degree of conflict of the product attributes to determine the importance of these conflicts. First, sales data for the abovementioned seven design schemes were collected. As smartphones are primarily sold online, data were integrated from major official stores on platforms such as JD.com, Tmall, Taobao, and various brand-specific mobile phone shops. Sales are denoted as Sai (i = 1, 2, \(\ldots\), 7), with the Redmi K60 Supreme Edition having the highest sales at approximately 760,000 units [40], followed by the OPPO Reno10 at approximately 670,000 units [40]. The OnePlus Ace2 Pro and Huawei Nova 11 have lower sales, approximately 450,000 units and 430,000 units [40], respectively. A regression model was then constructed with the degree of conflict as the independent variable.  
The coefficient \(\eta_{j}\) is the weight of the design attribute conflict degree \(DP_{j}\). The results are as Table 12: