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Ajayi, O O (2016) Maintenance management of prison facilities in South-West, Nigeria, Unpublished PhD Thesis, , University of Lagos (Nigeria).
Iroroakpo, G I (2007) A comparative study of direct labour and design-tender-construct procurement systems in Nigeria, Unpublished PhD Thesis, , University of Lagos (Nigeria).
- Type: Thesis
- Keywords: duration; contingency; government; integration; procurement choice; cost overrun; client; developer; stakeholder; Nigeria
- ISBN/ISSN:
- URL: https://www.proquest.com/docview/2700780302
- Abstract:
In Nigeria, Direct Labour and Design-Tender-Construct are two of the systems used by developers for the procurement of construction projects. The problem faced by clients in this situation is how to choose between the two options. In appreciation of this problem, this research appraises and compares direct labour and design-sender-construct system in Nigeria.The objectives of the research are to determine the level of use of the two procurement systems in the Nigerian construction industry, the level and difference in the characteristics of projects, project design, process and performance between the two procurement systems. To achieve these objectives, a cross-sectional research design approach was selected. This involved a field survey of a sample of 120 clients and 161 projects selected by quota-based purposive sampling technique from the six geo-political zones that make up Nigeria. The main research instruments adopted were two structured questionnaires namely: client and project questionnaires. The data collected were analysed using descriptive statistics of frequency, percentage, mean or mean item score as well as inferential statistics of t-test, chi-square (x¹), analysis of variance, discriminant and regression analyses. The major findings from the analysis of the data include direct labour and design-tender-construct are the two systems mostly used for the procurement of construction projects in Nigeria. However, design-tender-construct system is preferred and more used than direct labour system, the levels of project design and pre-contract project process are higher in design-tender-construct than direct labour while the level of post-contract project process is higher in direct labour than design-tender construct system, project time and size are higher in design-tender-construct system than direct labour system, although projects procured by the two systems considerably overran their planned time and initial cost, direct labour has greater economy over design-tender- construct system and the choice of the two procurement systems can be predicted based on project duration, project design and project process discriminant functions. The study concludes that the achievement of Nigeria's construction programmes in recent years bas depended mainly on the two procurement systems, however, design-tender-construct is more prominent and involves greater separation of design from construction than direct labour. It further concludes that cost-overruns are imminent and this considerably exceeds the ten percent contingency fund provided in projects and that the procurement choice of direct labour and design-tender-construct can be successfully classified. The study recommends that the two systems be used by clients, however, the direct labour should be used for small and medium projects while design-tender-construct should be used for large and complex projects, direct labour system should be used when the need for the integration of design and construction is desired, the existing 10 percent contingency fund be increased to 20 percent and that government should create a price control units in order to reduce cost-overruns and stakeholders should adopt the prediction models in their choice of the two procurement systems.