| Selection Criteria | Descriptive | One-sample t-test | Remark | |||
| Mean | Std. Dev. | t | Mean Diff. | Sig. (2-tailed) | ||
| Financial stability evaluation method | 3.77 | 0.421 | 17.199 | 0.773 | 0.00 | Very familiar |
| Management and technical ability evaluation method | 3.80 | 0.406 | 18.394 | 0.795 | 0.00 | Very familiar |
| Contractor’s experience evaluation method | 3.80 | 0.406 | 18.394 | 0.795 | 0.00 | Very familiar |
| Contractor’s past performance method | 3.78 | 0.441 | 16.69 | 0.784 | 0.00 | Very familiar |
| Plant and human resource evaluation method | 3.76 | 0.455 | 15.707 | 0.761 | 0.00 | Very familiar |
| Health and safety and environmental measures method | 3.23 | 0.562 | 3.795 | 0.227 | 0.00 | Familiar |