Causes, Effects, and Mitigation Measures of Time and Cost Overruns in Water Supply Projects: Case of Tigrai Region, Northern Ethiopia

Table 4

Top ten causes of time overrun ranked by respondents.

Nos	Causes of time overrun	Client’s view		Contractors’ view		Consultants’ view		Overall view
		RII	Rank	RII	Rank	RII	Rank	RII	Rank
1	Design errors and changes	99.9	5	112.6	2	121.0	1	109.2	1
2	Lack of consistency between bill of quantities and drawings	97.9	6	114.2	1	120.9	2	109.1	2
3	Change order	105.0	2	107.6	3	115.5	3	108.2	3
4	Shortage of construction materials and electromechanical equipment in local market	101.0	4	76.3	10	107.3	5	93.6	4
5	Delays in material import (pipes, fittings, etc.)	93.7	7	87.8	4	97.5	8	92.1	5
6	Ineffective planning and scheduling of projects by contractor	107.4	1	70.1	15	90.0	10	88.2	6
7	Slow decision-making	87.8	9	80.9	6	102.5	6	87.9	7
8	Contractor’s financial difficulties	104.7	3	77.7	8	68.0	20	86.0	8
9	Poor contract management of the owner/consultant	86.4	10	69.1	16	110.3	4	83.7	9
10	Delay in progress payments	90.3	8	82.0	5	70.0	17	82.8	10