## 4 Results
### Statutory Control and Monitoring Mechanism of the External Stone Cladding System in Hong Kong
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c} \hline \hline  & & \multicolumn{8}{c}{**Design Team**} & \multicolumn{8}{c}{**Construction Team**} & \multicolumn{2}{c}{**Mann-Whitney**} \\ \cline{3-14}
**Item** & **Factors** & \multicolumn{3}{c}{**Descriptive Statistics**} & \multicolumn{3}{c}{**Shapiro-Wilk Test**} & \multicolumn{3}{c}{**Descriptive Statistics**} & \multicolumn{3}{c}{**Shapiro-Wilk Test**} & \multicolumn{3}{c}{**U Test**} \\ \cline{3-14}  & **N** & **Mean** & **SD** & **SK** & **W** & **Sig.** & **N** & **Mean** & **SD** & **SK** & **W** & **Sig.** & **U** & **Sig.** \\ \hline \multirow{3}{*}{1} & QA provided by the stone supplier & 33 & 3.18 & 0.769 & 0.109 & 0.852 & 0.000 & 17 & 3.41 & 0.618 & 1.275 & 0.678 & 0.000 & 321.5 & 0.352 \\  & OA scheme executed by the manufacturer & 33 & 3.97 & 0.684 & 0.586 & 0.792 & 0.000 & 17 & 3.94 & 0.827 & 0.117 & 0.806 & 0.002 & 270.0 & 0.812 \\  & Pre-testing of stone materials \& system & 33 & 4.00 & 0.750 & 0.473 & 0.832 & 0.000 & 17 & 3.76 & 0.664 & 0.291 & 0.792 & 0.002 & 282.0 & 0.218 \\  & Production drawings and cutting list & 33 & 2.91 & 0.723 & 0.668 & 0.804 & 0.000 & 17 & 3.06 & 0.659 & -0.057 & 0.798 & 0.002 & 318.5 & 0.380 \\  & Mock-up construction and review & 33 & 3.12 & 0.696 & -0.168 & 0.803 & 0.000 & 17 & 2.59 & 0.870 & 1.629 & 0.710 & 0.000 & 163.5 & 0.010 \\  & Evaluation of stone materials by experts & 33 & 2.15 & 0.795 & 0.905 & 0.777 & 0.000 & 17 & 2.12 & 0.781 & -0.219 & 0.812 & 0.003 & 286.5 & 0.891 \\  & Supervision by TCP & 33 & 4.12 & 0.600 & -0.083 & 0.761 & 0.000 & 17 & 3.94 & 0.659 & 0.057 & 0.798 & 0.002 & 240.00 & 0.337 \\  & Supervision by Specialist & 33 & 2.91 & 0.522 & -0.139 & 0.697 & 0.000 & 17 & 2.82 & 0.636 & 0.143 & 0.785 & 0.001 & 285.0 & 0.575 \\  & Supervision by Expert & 33 & 2.21 & 0.650 & 1.949 & 0.540 & 0.000 & 17 & 2.29 & 0.686 & 0.861 & 0.779 & 0.001 & 307.5 & 0.460 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Factors to ensure the quality in the production stage (Comparison between ’Design Team’ and ’Construction Team’, \(n=50\)). In the interview survey, four interviewees agreed that Mainland China has turned into the primary source of stone suppliers and fabricators. Since the reformation and opening-up of China's market, the stone industry has been steadily developed in China. Today, the China's stone production bases are mainly Yunfu in Guangdong, Laizhou in Shandong, and Quanzhou in Fujian, among which Yunfu is constructing a world's largest international stone industrial city. However, the architect, the registered structural engineer, and the construction manager commented that the stone suppliers and factories in China vary greatly in their scale, quality, and reliability. Therefore, the visit of the storehouses and factories of the proposed stone suppliers and fabricators is vitally important to verify their capabilities and performance in quality control and assurance on their materials and production process. Besides, the stone suppliers and fabricators should have the International Organization for Standardization quality assurance certificates (ISO9000) to ensure that they are continuously performing quality management system and achieving the required quality standard. During the production process of stone panels, regular inspections and audits should be conducted by the representatives of the client, such as the project architect and structural engineer, as well as the independent agency of the client, to secure the fulfilment of legal and contractual requirements and specifications. Inspection and audit reports should also be prepared periodically to monitor the quality and progress of stone panel production and treatment.