Ogunsanya, Bukunmi (2018) Integrated sustainable procurement model for the Nigerian construction industry. (PhD thesis), University of Johannesburg, .
Abstract
One of the challenges of infrastructure development in Nigeria is the translation of capital budget spending into sustainable and enduring national assets which will positively impact on the quality of life of the citizens. In 2007, the government took a bold step in reorganizing its public procurement for enhanced performance and productivity. Despite this action, there remain enduring challenges in infrastructure procurement. How infrastructure delivery can be sustainably procured and what factors will bring about sustainable procurement that is economically viable, environmentally safe and socially responsible are the thrust of this research. Since no study has modelled sustainable procurements of publicly funded construction projects in Nigeria, with its recommendations of a regulatory environment, procurement method selection, organizational orientation, adoption of newer methodologies, stakeholder management, and construction industry development as latent constructs, this study is essential in filling the knowledge gap. The primary aim of the research was to identify the level of performance of procurement methods used in the country and then model to what extent regulatory environment, stakeholders’ management, procurement method selection, organizational orientation, construction industry development, and adoption of newer methodologies will promote sustainable procurements. Hence, this research investigated and modelled sustainable construction procurement in a developing nation’s context using a mixed-method approach, namely, a Delphi method and survey method. The first results relate to level of performance of different procurement methods used and the theory of sustainable procurement in construction. The findings revealed that sustainable procurement is a five-factor model. The other findings relate to the field questionnaire survey which shows that the hypotheseswere accepted. The final model (Model 2.0) indicates that constructs ‘regulatory environment’, ‘organizational orientation’, ‘procurement method selection’, ‘adoption of newer methodologies’ and ‘construction industry development’ are significant with ‘sustainable procurement’ and ‘procurement outcomes’ variable. ‘Stakeholders’ management’ was found to be insignificant. Thus, the factors identified have direct relationships in bringing about sustainable procurement in the Nigerian construction industry. Also, the goodness of fit and statistical significance of the parameter estimates met the cut-off criteria for the hypothesized model. A practical implication of the research is that the provision of efficient design, ensuring the project teams specify sustainable materials and redefining the concept of value for money on construction projects were the closest effort in the implementation of sustainable procurement in the industry. Therefore, the study recommends that policymakers, governments, corporate organizations, and other construction industry stakeholders in Nigeria will find the validated model useful in integrating sustainability in the procurement of infrastructure across the nation.
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