## 4 Analysis: ISM Processes and Results
### Level Partitioning of the Enablers  
Level partitioning of the CE enablers helped to further understand the established relationships while adding some relative importance, simplifying the interpretation, as discussed by [PERSON] [43] and [PERSON] and [PERSON] [37]. To achieve this partitioning, the final reachability matrix was edited to identify the intersections between each enabler's reachability and the antecedent sets. The reachability set involves the primary enabler and the ones it influences, while the antecedent set includes the primary enabler and the ones that influence it. The intersection set marks the overlap between these two sets [37; 43]. This research utilised the reachability matrix iteratively to partition the CE enablers into five levels. For example, Table 5 shows the first iteration, where enabler 11 has been assigned to level 1 because the reachability and intersection sets are identical. This process was repeated until all enablers were levelled, as shown in Tables 6-9. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline
**Code** & **E12** & **E11** & **E10** & **E9** & **E8** & **E7** & **E6** & **E5** & **E4** & **E3** & **E2** & **E1** &
\begin{tabular}{c} **Driving** \\ **Power** \\ \end{tabular} \\ \hline E1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 * & 1 & 1 & 1 & 1 & 12 \\ E2 & 1* & 1* & 0 & 1* & 1 & 1* & 1* & 1* & 0 & 1 & 1 & 0 & 9 \\ E3 & 1* & 1* & 0 & 1* & 1 & 1 & 1 & 1 & 0 & 1 & 1 & 0 & 9 \\ E4 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 0 & 11 \\ E5 & 1 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 4 \\ E6 & 1 & 1 & 0 & 0 & 0 & 0 & 1 & 1 & 0 & 0 & 0 & 4 \\ E7 & 1* & 1 & 0 & 1 & 1 & 1 & 1 & 0 & 1 & 1* & 0 & 9 \\ E8 & 1* & 1 & 0 & 1* & 1 & 1 & 1* & 1* & 0 & 1* & 1* & 0 & 9 \\ E9 & 1 & 1* & 0 & 1 & 1 & 1 & 1 & 0 & 1* & 1* & 0 & 9 \\ E10 & 1 & 1* & 1 & 0 & 0 & 0 & 1 & 1* & 0 & 0 & 0 & 0 & 5 \\ E11 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 \\ E12 & 1 & 1 & 0 & 0 & 0 & 0 & 1 & 1 & 0 & 0 & 0 & 0 & 4 \\ Dependence & & & & & & & & & & & & & & \\ Power & 11 & 12 & 3 & 7 & 7 & 7 & 11 & 11 & 2 & 7 & 7 & 1 & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: The final reachability matrix. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Code** & **E12** & **E11** & **E10** & **E9** & **E8** & **E7** & **E6** & **E5** & **E4** & **E3** & **E2** & **E1** \\ \hline E1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 0 & 1 & 1 & 1 & 1 \\ E2 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 1 & 0 \\ E3 & 0 & 0 & 0 & 0 & 1 & 1 & 0 & 1 & 0 & 1 & 1 & 0 \\ E4 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 1 & 0 \\ E5 & 1 & 1 & 0 & 0 & 0 & 0 & 1 & 1 & 0 & 0 & 0 & 0 \\ E6 & 1 & 1 & 0 & 0 & 0 & 0 & 1 & 1 & 0 & 0 & 0 & 0 \\ E7 & 0 & 1 & 0 & 1 & 1 & 1 & 1 & 1 & 0 & 1 & 0 & 0 \\ E8 & 0 & 1 & 0 & 0 & 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0 \\ E9 & 1 & 0 & 0 & 1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 & 0 \\ E10 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 \\ E11 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 &The resulting structure represents the hierarchy and interdependencies of the enablers, it clarifies the roles and prioritisation for decision-making within the CE framework in construction mega-projects. In the second iteration, [11] was removed from the reachability set, and the identical enablers in both reachability and intersection sets were assigned level 2. In the third iteration, [5,6,12] were excluded from the reachability set, and enablers common to both the reachability and intersection set were categorised into level 3.