| No. | Causes of Change Orders | Percentage of Respondents | Median | Mode | |||||
| Strongly Disagree | Disagree | Neither Agree or Disagree | Agree | Strongly Agree | Severity Index | ||||
| 1 | Changes initiated by clients | 0.7 | 0.7 | 6.6 | 15.1 | 77.0 | 93.42 | 5.00 | 5 |
| 2 | Design errors | 1.3 | 1.3 | 0.6 | 33.5 | 63.2 | 91.23 | 5.00 | 5 |
| 3 | Inconsistency between contract documents | 0.6 | 0.6 | 3.9 | 47.7 | 47.1 | 88.00 | 4.00 | 4 |
| 4 | Lack of communication between project parties | 0 | 1.9 | 6.5 | 63.9 | 27.7 | 83.48 | 4.00 | 4 |
| 5 | Incomplete design | 0.6 | 1.9 | 27.1 | 59.4 | 11.0 | 75.61 | 4.00 | 4 |
| 6 | Estimation errors | 0.6 | 5.2 | 31.6 | 55.5 | 7.1 | 72.65 | 4.00 | 4 |
| 7 | Time lag between design and construction phases | 0 | 7.1 | 38.1 | 51.6 | 3.2 | 70.19 | 4.00 | 4 |
| 8 | Different site conditions | 0.6 | 16.9 | 55.2 | 26.0 | 1.3 | 62.08 | 3.00 | 3 |
| 9 | Shortages of materials | 13.0 | 43.5 | 36.4 | 7.1 | 0 | 47.53 | 2.00 | 2 |