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Table 2: Relative importance index and ranking of delay factors

Owners Consultants Contractors Overall
Category Factor Index Rank Index Rank Index Rank Rank
Client Payments of completed work 3.57 3 3.29 3 3.64 1 1
Owner interference 2.67 28 2.25 32.5 2.50 27.5 30
Slowness of decision making process 3.21 11 2.67 21.5 3.05 8.5 15
Unrealistic contract duration 2.79 26.5 2.48 28 2.64 24 24
Excessive bureaucracy in project owner operation 2.07 37.5 2.17 35.5 2.50 27.5 33
Tendering procedure 2.54 29 2.75 20 3.09 6.5 19.5
Changes in scope of works 2.50 30.5 2.38 31 2.00 39 34
Contractor Subcontractors 1.85 41 1.77 42 1.82 42 42
Inadequate contractor experience 3.36 6.5 3.38 2 2.95 10.5 5
Site management 3.79 1 3.54 1 3.05 8.5 2
Construction methods 3.36 6.5 2.92 13 2.91 14 10.5
Improper planning 3.29 9 3.13 7 3.14 5 8
Mistakes during construction 2.07 37.5 2.25 32.5 1.95 40.5 39
Contractor’s financial difficulties 3.21 11 3.08 9 3.09 6.5 9
Consultant Contract management 2.93 24 2.54 23.5 2.91 14 22.5
Approval of shop drawings 3.46 5 3.17 6 3.18 4 3
QA/QC 2.93 24 2.43 29 2.27 33 29
Inspections and testing procedure used in the project 2.5 30.5 2.50 26 2.29 31 31
Design errors 3.57 3 2.88 15.5 2.82 18.5 10.5
Deficiencies in cost estimates prepared 3.00 19.5 3.21 5 3.32 3 6.5
Material Quality of material 2.00 39 2.21 34 2.32 30 35.5
Shortage of material 2.79 26.5 2.88 15.5 2.82 18.5 19.5
Material procurement 3.14 13.5 2.92 13 2.82 18.5 15
Material changes in types and specifications during construction 2.36 34 2.04 37 2.23 36 37
Labour Labour supply 3.00 19.5 2.67 21.5 2.23 36 25
Labour productivity 3.07 15.5 3.00 10.5 2.59 25.5 17.5
Shortage of technical and skilled personnel 3.57 3 3.26 4 2.91 14 6.5
Machinery and equipment Shortage of equipment and spare parts 3.07 15.5 2.92 13 2.91 14 13
Equipment failure 3.00 19.5 2.79 19 2.59 25.5 22.5
Equipment productivity 3.14 13.5 2.83 17.5 2.73 22 17.5
Contractual relationship Major disputes and negotiations 3.00 19.5 2.17 35.5 2.68 23 27
Inappropriate overall organizational structure linking all parties to the project 3.00 19.5 2.54 23.5 2.91 14 21
Mistakes and discrepancies in contract documents 2.93 24 2.50 26 2.36 29 26
External Weather conditions 1.93 40 1.83 40.5 2.23 36 40
Inflation 2.14 36 2.42 30 2.82 18.5 28
Changes in regulations and standards 1.79 42 1.83 40.5 1.95 40.5 41
Problems with neighbours and site conditions 2.21 35 2.00 38.5 2.27 33 38
Political issues 2.43 32.5 2.00 38.5 2.27 33 35.5
Special factors in dam construction Unforeseen ground conditions 3.31 8 3.09 8 3.33 2 4
Extreme floods 3.00 19.5 3.00 10.5 2.81 21 15
Environmental impacts 2.43 32.5 2.50 26 2.05 38 32
Inadequate investigations in borrow areas 3.21 11 2.83 17.5 2.95 10.5 12