## 3 Research Methodology  
The proposed automated QC system focuses on assessing the data quality of BIM models across various disciplines, such as architectural (ARCH), structural (STR), mechanical (MECH), piping (PIP), and electrical (ELEC), during the preliminary and detailed design phases, guided by a proposed BIM close-out checklist. This checklist was designed for project-specific demands, incorporating LOD, LOI, and BEP requirements. All of the figures and tables presented in this study are original. Table 2 presents a detailed BIM close-out checklist that includes a comprehensive selection of QC categories for verification and checking. Each category on the checklist has been carefully selected based on its potential impact on crucial project outputs, including QTO, coordination, naming conventions, and the accuracy of the BIM model. The BIM experts established the project's LOD, LOI, and BEP requirements and developed the BIM QC checklist. Then, the engineering team approved the QC checklist accordingly to be used as part of the project's QC process. This evaluation process ensures that the QC categories are not only relevant but also critical to the success of the project. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multicolumn{5}{c}{**Proposed BIM Close-Out Checklist**} \\
**Discipline** & **Category** & **Yes** & **No** & **N/A** & **Scope Affected** \\ \hline \multirow{7}{*}{General} & Family (starts with the specified prefix) & \(\square\) & \(\square\) & \(\square\) & Naming Convention Agreement \\  & The model respects the export view & \(\square\) & \(\square\) & Coordination/Naming Convention \\  & procedure & \(\square\) & \(\square\) & Agreement \\  & Project units are in mm & \(\square\) & \(\square\) & BIM Modeling Accuracy \\  & REVIT warnings have been reviewed & \(\square\) & \(\square\) & BIM Modeling Accuracy/QTO/Coordination \\  & Element Phase Separation & \(\square\) & \(\square\) & Coordination/QTO \\  & Element Workset Assignment & \(\square\) & \(\square\) & Coordination/QTO \\  & Workset Name (starts with the specified discipline code) & \(\square\) & \(\square\) & Coordination/QTO \\  & Material Name (starts with the specified prefix) & \(\square\) & \(\square\) & Naming Convention Agreement \\  & Element Material Assignment & \(\square\) & \(\square\) & QTO \\  & Element Surface & \(\square\) & \(\square\) & QTO \\ ARCH & Door Element Code Assignment & \(\square\) & \(\square\) & Naming Convention Agreement \\  & Door Element Code (exterior/interior) & \(\square\) & \(\square\) & Naming Convention \\  & Rooms with a Closed Area & \(\square\) & \(\square\) & Agreement/QTO \\  & Element Structural Material Assignment & \(\square\) & \(\square\) & QTO \\  & Element Volume & \(\square\) & \(\square\) & QTO \\  & Element Area & \(\square\) & \(\square\) & QTO \\ STR & Concrete Elements with CON Workset & \(\square\) & \(\square\) & QTO \\  & Steel Elements with STE Workset & \(\square\) & \(\square\) & QTO \\  & Steel Elements with a Nominal Weight & \(\square\) & \(\square\) & QTO \\  & Value & & & \\  & W-Shape Steel Elements with Correct & & & \\  & Nominal Weight Value & & & \\  & Insulated Elements with Insulation & & & \\ MECH & Thickness & \(\square\) & \(\square\) & BIM Modeling Accuracy/QTO \\  & Pipe Elements with Material & \(\square\) & \(\square\) & BIM Modeling Accuracy/QTO \\ PIP & Pipe Elements with Material & \(\square\) & \(\square\) & BIM Modeling Accuracy/QTO \\  & Element Size (specified categories) & \(\square\) & \(\square\) & BIM Modeling Accuracy/QTO \\ ELEC & Element Size (specified categories) & \(\square\) & \(\square\) & BIM Modeling Accuracy/QTO \\ \hline \hline \end{tabular}
\end{table} 
Table 2: The proposed BIM close-out checklist verification categories and their impacts on BIM projects. As shown in Table 2, there are many different QC categories, each with its specific parameters and standards to meet. For example, categories like \"export view's name\" and \"BIM model warnings\" are checked to ensure accuracy and follow project standards.