| Cluster | Kruskal-Wallis Median | Mann-Whitney Test pValue | Cronbach’s Alpha |
|---|---|---|---|
| p-value < 0.001 | Operational × Expert | ||
| People | 4.6 | 0.60 | 0.6119 |
| Process | 3.8 | 0.71 | 0.7624 |
| Technology | 4.0 | 0.10 | 0.7744 |
| Organization | 4.6 | 0.47 | 0.6918 |
| Kruskal-Wallis test results for cluster evaluations | Mann-Whitney test results for operational and expert drilling centers | Cronbach’s alpha coefficient for the PPTO clusters |