|
| Researchers | Number of projects | Project types | Project size | Major findings |
|
| Randolph et al. (1987) [3] | 119 | Street, sewer, sidewalk, bridge repair, and so forth. | Up to
$5 M | Cost overruns were correlated with the name of the contractor, type of work, project size, and the number of items in bid. |
|
| Jahren and Ashe (1990) [1] | 1,576 | Naval Facilities Engineering Command (NAVFAC) construction projects | Over $1 M | Cost overruns were correlated with the size of the project and the difference between the low bid and the government estimate. |
|
| Roth (1995) [4] | 12 | Navy child care facilities | N/A | Cost overruns were less in DB projects compared to DBB projects. |
|
| Konchar and Sanvido (1998) [5] | 271 | Industrial and building projects | N/A | Cost and schedule overruns were fewer in DB projects than in DBB projects. |
|
| Vidalis and Najafi (2002) [6] | 700 | Highway projects | $40 K to $20 M | Cost and schedule overruns were correlated with design changes, changed conditions, utility conflicts, and weather damage delays. |
|
| Odeck (2004) [2] | 620 | Road projects | Up to 350 NOK | Cost overruns were correlated with the size, construction duration, and location of the projects. |
|
| Lee (2008) [7] | 161 | Road, rails, airports, and ports projects | N/A | The main reasons for cost overruns were changes in scope, delays in construction, inaccurate estimates, and adjustment of project costs. |
|
| Shrestha et al. (2007) [8] | 11 | Highway projects | $50 M to $1.3 B | Cost overruns were lower in DB projects than in DBB projects. However, schedule overruns were higher in DB projects than in DBB projects. |
|
| Hale et al. (2009) [9] | 77 | Navy bachelor’s enlisted quarters | N/A | Cost and schedule overruns were significantly lower in DB projects than in DBB projects |
|
