Abstract
Cost and schedule overruns are endemic features of transport infrastructure projects. Despite the considerable amount of research within the field of transport and planning in the past thirty years, limited progress has been made to improving the performance of projects. We contend that this will continue to be an issue as long as research efforts focus on the ‘outside view’ with emphasis being placed upon strategic misrepresentation and optimism bias. Understanding ‘why’ and ‘how’ projects overrun, particularly from both ‘outside’ and ‘inside’ perspectives, is pivotal to reducing their impact and occurrence. Thus, in conjunction with the transport and planning literature, references to cost-overrun studies undertaken within the field of construction and engineering are examined. Our objective is to provide policy makers, industry, voluntary organizations, and the public at large with an ameliorated understanding about time-overrun and cost-overrun phenomena. Suggestions to mitigate overruns based upon recent process and technological innovations are identified and discussed.
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