## 4 Research Approach
### Results of Deriving Association
\begin{table}
\begin{tabular}{c|l l l l l l l} \hline
**No.** & **LHS** & **=>** & **RHS** & **Support** & **Confidence** & **Lift** & **Classification** \\ \hline
[1] & {architecture, design change,  underground parking lot} & \textgreater{} & {architecture, design change,  public facilities} & 0.164 & 0.681 & 2.098 & \(\bullet\) \\ \hline
[2] & {earthwork, site conditions, etc.} & \textgreater{} & {earthwork, site conditions,  underground} & 0.154 & 0.730 & 2.695 & \(\circ\) \\ \hline
[3] & {architecture, design change,  roof} & \textgreater{} & {architecture, design change,  public facilities} & 0.154 & 0.648 & 1.997 & X \\ \hline
[4] & {architecture, design change,  balcony} & \textgreater{} & {architecture, design change,  public facilities} & 0.151 & 0.634 & 1.954 & X \\ \hline
[5] & {architecture, design change,  underground parking lot} & \textgreater{} & {architecture, design change,  balcony} & 0.147 & 0.611 & 2.574 & X \\ \hline
[6] & {architecture, design change,  balcony} & \textgreater{} & {architecture, design change,  roof} & 0.140 & 0.592 & 2.491 & \(\triangle\) \\ \hline
[7] & {architecture, design change,  public facilities} & \textgreater{} & {architecture, design change,  common} & 0.140 & 0.433 & 1.904 & \(\triangle\) \\ \hline
[8] & {earthwork, site conditions,  outdoor} & \textgreater{} & {earthwork, site conditions,  underground} & 0.134 & 0.851 & 3.142 & \(\bullet\) \\ \hline
[9] & {architecture, design change,  corridor} & \textgreater{} & {architecture, design change,  public facilities} & 0.124 & 0.712 & 2.193 & X \\ \hline
[10] & {architecture, design change,  underground parking lot} & \textgreater{} & {architecture, design change,  common} & 0.120 & 0.500 & 2.199 & \(\circ\) \\ \hline
[11] & {architecture, design change,  underground parking lot} & \textgreater{} & {architecture, design change,  roof} & 0.120 & 0.500 & 2.106 & X \\ \hline
[12] & {architecture, design change,  public facilities} & \textgreater{} & {architecture, design change,  outdoor} & 0.120 & 0.371 & 2.094 & \(\bullet\) \\ \hline
[13] & {architecture, design change,  balcony} & \textgreater{} & {architecture, design change,  common} & 0.117 & 0.493 & 2.168 & \(\triangle\) \\ \hline
[14] & {architecture, design change,  corridor} & \textgreater{} & {architecture, design change,  balcony} & 0.114 & 0.654 & 2.754 & X \\ \hline
[15] & {architecture, design change,  outdoor} & \textgreater{} & {architecture, design change,  balcony} & 0.110 & 0.623 & 2.622 & X \\ \hline
[16] & {architecture, design change,  roof} & \textgreater{} & {architecture, design change,  outdoor} & 0.107 & 0.451 & 2.543 & X \\ \hline
[17] & {architecture, design change,  common} & \textgreater{} & {architecture, design change,  roof} & 0.107 & 0.471 & 1.982 & X \\ \hline
[18] & {architecture, design change,  outdoor} & \textgreater{} & {architecture, design change,  underground parking lot} & 0.104 & 0.585 & 2.429 & \(\circ\) \\ \hline
[19] & {architecture, site conditions,  underground} & \textgreater{} & {earthwork, site conditions,  underground} & 0.104 & 0.646 & 2.384 & \(\bullet\) \\ \hline
[20] & {architecture, site conditions,  etc.} & \textgreater{} & {earthwork, site conditions,  underground} & 0.104 & 0.544 & 2.008 & \(\circ\) \\ \hline
[21] & {architecture, design change,  roof} & \textgreater{} & {earthwork, site conditions,  underground} & 0.104 & 0.437 & 1.612 & X \\ \hline
[22] & {architecture, design change,  underground parking lot} & \textgreater{} & {earthwork, site conditions,  underground} & 0.104 & 0.431 & 1.589 & \(\bullet\) \\ \hline \hline \end{tabular} \(\bullet\): strong rules, \(\circ\): relevant and explainable rules, \(\triangle\): relevant rules but difficult to explain, X: irrelevant rules.  
\end{table} 
Table 4: Results of derivation of association rules for all design change issue data. to be paid, settlements, change of business approval documents, and safety inspections. Therefore, the type of underground civil works may also be changed depending on the site conditions.