In this study (1) contractor selection and pre-qualification models and systems in the literature are examined and (2) the proposal of a multi agent systems (MAS) based contractor prequalification model in order to support client's decision with the optimal solution in a contractor selection phase are introduced. A meta-classification and analysis study based on a comprehensive literature survey is used to analyse models and approaches available. Three basic tendering processes, which are open, selective limited and negotiated, were studied and a prototype program is created to implement the model proposed. In addition, the tender management system is conceptually discussed in the context of the model.
Sustainable redevelopment following disasters has been a main policy objective of post-disaster recovery efforts over the past few decades. Yet, nine years after the 1999 Marmara earthquake in Turkey, the redevelopment of risky housing areas is still a point of debate on the urban planning and disaster mitigation agenda. However, planning studies on mildly and moderately damaged areas located in the centre of Istanbul are ongoing. This article presents the evidence of a pilot project undertaken by Zeytinburnu Municipality, Istanbul, four years after the Marmara earthquake.(2) The aim is to generate a debate on the preconditions required for a sustainable urban regeneration approach in the post-disaster recovery phase. The results of the pilot project underline the importance of capacity building in sustaining social capital, strengthening the legal framework, restructuring planning regulations, and managing the housing redevelopment process by taking advantage of a window of opportunity afforded by the disaster recovery period.
PurposeThe objectives of this paper are to discuss the constraints stemming from the unstructured nature of the cost estimation practice in Turkey and introduce a generic computer aided building cost estimation model based on a cost significant technique for Turkish construction sector public projects in its detailed design phase.Design/methodology/approachThe research design was based on the simplified version of the bill of quantities method and a cost significant estimating model works on a cost database was suggested to overcome the problems. Underlying principles and basic steps of cost estimation based on cost significant work packages was explained by means of manual calculations.FindingsIn order to automate the manual building cost estimation process, the software based on cost significant work packages was developed.Research limitations/implicationsThe software is currently in the testing phase and is being used for educational purposes. Making use of both public sector and current market prices in the cost estimation process, increasing number of projects stored in the database for more accurate results, estimating costs of different types of projects and calculating the cost significant value factor more precisely by using statistical techniques, those being employed by global cost models are suggested for future research.Practical implicationsAs the number of the similar projects in database is increased, the accuracy of the cost estimation is also increased.Originality/valueEstimators and graduate students can use the software to estimate building cost of public housing projects in its detailed design phase.
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