Comparative Performance Evaluation of the Traditional Design-Bid-Build (DBB) and Design-Build (DB) Procurement Methods in Ghana
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Date
2009-08-11
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Abstract
The data gathered was analysed using analysis of variance with the aid of Statistical Package for Social Sciences (SPSS 13). The success factors were also identified by subjecting each of the factors to significant test at 99% confidence interval.
The study revealed that most DB projects are completed within their respective budgets whilst a greater number of DBB projects incur cost overruns due to variations and price fluctuations. The time performance comparison also placed DB projects better than their DBB counterparts as most of the DB projects were completed within programme.
The study further revealed that, there is no significant difference between the qualities of completed projects executed under the two procurement methods.
Out of 35 factors listed, 11 were identified as significant to the performance of DBB projects
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which are: awarding bids to the right bidder, availability of resources, clients' ability to adequately fund the project, overall managerial action in planning, organizing, leading and controlling, project team leaders' commitment to time, cost and quality, inflation, interest rates, payment procedures, arbitration as a method of conflict resolution, progress meeting and control mechanism of sub-contractors work.
Six (6) factors were also identified as significantly important to the success of DB projects. These are: awarding bids to the right bidder, availability of resources, clients' ability to adequately fund the project, overall managerial action in planning and organizing, contract documentation and project team leaders' knowledge and skill (competence).
(Keywords: building projects, traditional design-bid-build (DBB), design and build (DB), success factors and project performance)
Description
A Thesis submitted to the Department of Building Technology, Kwame Nkrumah University of Science and Technology in partial fulfilment of the requirements for the degree of
Master of Science in Construction Management.