Deviations and Defects of the Sub-Task’s Requirements in Construction Projects

The sub-task pattern in terms of deviations and defects
should be identified and understood in order to improve the quality of
practices in construction projects. Therefore, sub-task susceptibility
to exposure to deviations and defects has been evaluated and
classified via six classifications proposed in this study. Thirty-four
case studies of specific sub-tasks (from compression members in
constructed concrete structures) were collected from seven
construction projects in order to examine the study’s proposed
classifications. The study revealed that the sub-task has a high
sensitivity to deviation, where 91% of the cases were recorded as
deviations; however, only 19% of cases were recorded as defects.
Other findings were that the actual work during the execution process
is a high source of deviation for this sub-task (74%), while only 26%
of the source of deviation was due to both design documentation and
the actual work. These findings significantly imply that the study’s
proposed classifications could be used to determine the pattern of
each sub-task and develop proactive actions to overcome issues of
sub-task deviations and defects.

• Abdullah Almusharraf
• Andrew Whyte

• Sub-tasks
• deviations
• defects
• quality
• construction projects.

[1] Barker, K., Review of Housing Supply, Delivering Stability: Securing our Future Housing Needs. HM Treasury, London, 2004.
[2] Sommerville, J., Defects and rework in new build: an analysis of the phenomenon and drivers. Structural Survey, 2007. 25(5): p. 391-407.
[3] Bonner, S.E., A model of the effects of audit task complexity. Accounting, Organizations and Society, 1994. 19(3): p. 213-234.
[4] Campbell, D.J., Task complexity: A review and analysis. Academy of management review, 1988. 13(1): p. 40-52.
[5] Blacud, N.A., et al., Sensitivity of construction activities under design uncertainty. Journal of Construction Engineering and Management, 2009. 135(3): p. 199-206.
[6] Love, P.E., et al., Project pathogens: The anatomy of omission errors in construction and resource engineering project. Engineering Management, IEEE Transactions on, 2009. 56(3): p. 425-435.
[7] Burati, J.L. and J.J. Farrington, Costs of quality deviations in design and construction. 1987: Bureau of Engineering Research, University of Texas at Austin.
[8] Mills, A., P.E. Love, and P. Williams, Defect costs in residential construction. Journal of Construction Engineering and Management, 2009. 135(1): p. 12-16.
[9] Chapman, J.C., Learning from failures, in Learning from construction failures, C. P, Editor. 2001, Whittles Publishing: UK. p. 71–101.
[10] Robinson, P., Task complexity, task difficulty, and task production: Exploring interactions in a componential framework. Applied linguistics, 2001. 22(1): p. 27-57.
[11] Kélada, J., Comprendreetréaliser la qualitétotale. 1991: ÉditionsQuafec.
[12] Jaafari, A., Human factors in the Australian construction industry: towards total quality management. Australian Journal of Management, 1996. 21(2): p. 159-185.
[13] (SBC), S.B.C., 304 Structural – Concrete Structures, 1st ed., the Saudi Building Code National Committee (SBCNC), 2007.
[14] Creswell, J.W. and V.L.P. Clark, Designing and conducting mixed methods research. 2007.
[15] Yin, R.K., The case study anthology. 2004: Sage.