The study done by (Oko John Ameh & Emeka Emmanuel Osegbo , 2011) shows relationship between time overrun and labour productivity. The study concludes by recommending that early appointment of project managers could ensure proper management of both the human and material resources that could guarantee improved productivity and ultimately save projects from time overrun. Time overrun is the time during which some part of construction project is completed beyond the project completion date or not performed as planned due to unanticipated circumstances. (Bramble and Callahan ,1987)(Pinto and Mantel 1990) identified the risk variables through their research study viz. project scope, managerial goals, time planning and management, communication with owner etc. Zhi(1995) through his study identified country environment, characteristics of company and project conditions. Wang et al. (2000) identifies variables such as Political risks as major variable and further classified risks into six groups such as regulation and law changes, corruption, delays of permit, force majeure, etc. (Chan et al 2001), provided for performance of design build projects as critical success factors for the project. (Baloi & Price, 2003) identified international risk in more detail, by grouping them into design, competitiveness, customs and cultures, construction, economy conditions. The existing approaches to risk management have many shortcomings, namely failure to capture uncertainty effectively , they are prominently quantitative and neglect the qualitative side of risk; they build on statistical decision theory which is largely prescriptive and does not take experience and judgement into account; most decision making problems in construction incorporate judgement and experience. (Daniel Baloi and Andrew D. F. Price, 2001)
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