Abstract
Detrimental variations are variations which negatively impact the project performance resulting into scenarios such as cost overruns, time overruns, project abandonment, rework, disruption and conflicts. These scenarios have led to non-fulfillment of project objectives. The objective of the study was to develop a mitigation model that helps to mitigate detrimental variations in public building projects in Tanzania. Specifically, the research question was how can detrimental variations be minimised in building projects? Literature review was carried out. Data were collected using questionnaire survey, group discussion and case studies. In total, 143 professionals (architects, engineers, quantity surveyors and procurement officers) participated in the survey. Statistical analyses such as Analysis of Variance (ANOVA), T-test analysis, Spearman’s rho correlation analysis and Principal Component Analysis (PCA) were used to analyse data and obtain relationships of variables. The analysis generated significant independent and dependent variables that formed the basis for the developed detrimental variation mitigation model. The model was validated through focus group discussion to test the model’s usefulness, clarity and applicability. Findings from case studies suggest that building projects suffered detrimental variations. The developed model when used significantly contributes to reduction of detrimental variations. Project parties should use the developed best practice model to enhance performance of construction projects.
Highlights
Due to detrimental variations construction projects often undergo scenarios such as cost overruns, time overruns, project abandonment, rework, disruption and conflicts
This has made the study worthwhile because the study was on public building projects
Other significantly correlated variables include eleven variables for CoPD2; seven for CoPD3; two for CoPD4; nine for CoPD5; four for CoPD6 and two for CoPD7. These results demonstrate that the seven construction performance dimensions (CoPDs) exhibit different association levels and were influenced by the contributing factors (CFs)
Summary
Due to detrimental variations construction projects often undergo scenarios such as cost overruns, time overruns, project abandonment, rework, disruption and conflicts. These scenarios have led to non-fulfillment of project objectives. Detrimental variations could be a major contributor to the above raised problems in the development of construction projects. One would expect the project to be completed within the initially anticipated cost, time and quality, but reality takes the opposite direction. This tends to raise concern on infrastructure facilities developed by using meager public resources that fail to provide the anticipated value for money
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