Architecture, Building and Planning - Theses
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ItemProcess dynamics : buffer management in building project operations( 2000)The management of uncertainty and complexity is necessary for performance in the management of building projects. This thesis explores lean production and its engagement of uncertainty and complexity to ascertain the means by which lean thinking can best be used to enhance building project performance. As uncertainty and complexity impede performance, they are often managed in ways that will minimise their impact. Buffers like excess inventory and deliberate delays have been used to shield operations from the effects of uncertainty and complexity to improve levels of performance. However, lean thinking argues that the use of buffers to shield uncertainty and complexity from operations is wasteful and induces operational inertia. It eliminates these buffers and utilises operating capacity as an alternative to enable a more efficiently responsive engagement of uncertainty and complexity. Thus, the purpose of buffers changes in lean operations from that of a shield to that of enhancing accommodative capabilities. Buffers are therefore considered necessary, and the concept of process dynamics is introduced to consolidate the management of buffers. Process dynamics encapsulates the insight from lean thinking about the efficiently responsive accommodation of uncertainty and complexity. Building projects require the provision of choice and variety under conditions of considerable uncertainty. Projects structures are arranged to provide variety, yet contend poorly with the uncertainty and complexity present. The consequence is waste that leads to prolonged duration and increased costs. The provision of choice and variety means that some degree of uncertainty and complexity is intrinsic to high levels of performance. Consequently, approaches that better accommodate, rather than shield uncertainty and complexity can improve time and cost performance while still enabling the provision of wide product variety. Levels of wasteful practice in building projects are described through the meta-analysis of past studies into deficient practices in building projects. This analysis confirmed the high levels of waste. The process dynamics concept is tested through a simulation model. This model indicates the performance improvement from deploying buffers under the process dynamics regime. The results indicate that process dynamics provides the means for utilising lean thinking in the management of building projects to maximise performance outcomes.