Quantity Surveying- Scholarly Publications

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Browsing Quantity Surveying- Scholarly Publications by Author "Ajayi, O.M."

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    Open Access
    Decision support weighted score system (DSWSS) for selection of construction contractor in Nigeria
    (Obafemi Awolowo University Faculty of Environmental Sciences, 2014-09) Ajayi, O.M.; Ogunsanmi, E.O.; Akinsiku, O. E.
    The aim of this study was to develop a computer aided methodology to determine the weights of the different parameters for contractor selection as there is no standard assessment procedure for evaluating contractor selection criteria (CSC) by decision makers in Nigeria. A survey research is adopted for this study via descriptive research design. The populations are public clients and consultant organisation. Stratified sampling technique method is used because they are of the same homogenous group, that is divided into strata. Questionnaires were distributed to clients' organization and construction professionals in consulting firms. The lists of practicing construction professionals were obtained from their professional bodies. The sample size was calculated using Cochran formula while Statistical Package for Social Science (SPSS) 17th version was used to analyse the biographical information of the respondents. The computer aided methodology used is a desktop application known as C Sharp (C#). The result gives the weights in percentage that could be assigned to contractor selection criteria (CSC) at both prequalification and tender and tender evaluation criteria. In conclusion, the weighted percentage can be used by decision makers during selection of contractor for construction projects to ensure objectivity judgement.
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    Open Access
    Implementation of total quality management of construction companies in Lagos state, Nigeria
    (University of Ilorin Faculty of Environmental Sciences, 2018) Ajayi, O.M.; Akinsiku, O. E.; Salami, T.O.
    Total Quality Management (TQM) is a continuous method of sustaining improvement and satisfying the clients’ demands. The essence is to increase competitive, innovation, profits and also to reduce rework. Construction companies had been reluctuant in the implementation of TQM. Thus, the purpose of this study is to assess the challenges and constraints in the implementation of Total Quality Management (TQM) of construction companies with a view to ensure conformity to client specification and satisfaction. Cross sectional research design was used for this study and the population entails construction professionals in indigenous and expatriate construction companies in Nigeria. Random sampling procedure was used to select the respondents. Statistical Package for Social Science (SPSS) 17th version was used to analyse using descriptive statistic and the relative importance index(RII) of the level of importance of the factors were calculated. Findings showed that management commitment factors, role of quality department, training and education, employee involvement and client’s satisfaction orientation were constraints affecting the implementation of TQM. The difficulties faced in implementation of TQM were challenges of lack of available quality system documentation, lack of understanding in the process requirement, high cost to implement TQM, lack of TQM exposure and lack of planning. In conclusion, Nigeria construction companies practice TQM at the management level with no adequate quality control and assurance manual. It was therefore recommended that Nigeria construction companies should developed a framework for the purpose of quality standard and for them to compete with their counterpart globally.
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    Open Access
    Sustainable Project Delivery of Public Procurement Projects: Contractor Selection Procedure
    (Springer Nature Switzerland, 2020) Akanmu, J.O.; Ajayi, O.M.; Akinsiku, O. E.
    Selecting a competent contractor is a yardstick for sustainable project delivery. It ensures the project is completed within time, cost and quality standard. This study assesses the procedure of Nigeria’s public procurement Act of 2007 and identifies the frequency of use of prequalification criteria. The research is both exploratory and quantitative in nature. The population for the quantitative study was public clients and consulting organization. Stratified random sampling technique was used. The sample size was calculated using Cochran formula. A total of 300 questionnaires were distributed using Cochran formula to generate the sample size. From the sample size calculated, 196 were from consulting firms and 31 from public clients’ organization. Statistical Package for Social Science (SPSS) 21st version was used to analyse the data using frequency, percentage, relative importance index (RII) and t-test. There was an agreement between public clients’ and consultant organisation on the frequency of use of contractors’ prequalification criteria. In conclusion, it is important to consider the method of procurement, size of the project and complexity of the project to ensure the optimum balance of experience, positive references, working chemistry and teamwork.