Open Access
Table 3
RII and causes of waste.
| Causes | Frequency of “5” responses | Frequency of “4” responses | Frequency of “3” responses | Frequency of “2” responses | Frequency of “1” responses | RII | Rank |
|---|---|---|---|---|---|---|---|
| Frequent design changes | 64 | 44 | 6 | 5 | 5 | 0.853 | 1 |
| Poor site mgt and supervision | 72 | 20 | 14 | 18 | 0 | 0.835 | 2 |
| Changes in material specification and type | 60 | 28 | 16 | 18 | 2 | 0.803 | 3 |
| Rework | 45 | 38 | 8 | 12 | 21 | 0.719 | 4 |
| Lack of coordination between parties | 12 | 39 | 67 | 6 | 3 | 0.680 | 5 |
| Mistakes during construction | 15 | 70 | 5 | 16 | 18 | 0.677 | 6 |
| Labor productivity | 18 | 48 | 21 | 28 | 9 | 0.661 | 7 |
| Mistakes and errors in design | 8 | 68 | 15 | 12 | 21 | 0.648 | 8 |
| Incompetent subcontractors | 9 | 60 | 22 | 12 | 21 | 0.639 | 9 |
| Inadequate planning and scheduling | 0 | 40 | 52 | 32 | 0 | 0.613 | 10 |
| Inadequate monitoring and control | 22 | 24 | 27 | 38 | 13 | 0.606 | 11 |
| Equipment availability and failure | 9 | 27 | 59 | 17 | 12 | 0.606 | 12 |
| Lack of experience | 21 | 32 | 21 | 25 | 25 | 0.598 | 13 |
| Slow information flow between parties | 18 | 22 | 13 | 71 | 0 | 0.579 | 14 |
| Shortage of technical personnel (skilled labour) | 13 | 28 | 24 | 17 | 42 | 0.524 | 15 |
| Effect of weather | 5 | 12 | 36 | 49 | 22 | 0.485 | 16 |
| Shortage of site workers | 2 | 5 | 17 | 2 | 98 | 0.295 | 17 |
| Inaccurate quantity take-off | 0 | 0 | 14 | 25 | 85 | 0.285 | 18 |
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