Chukwuemeka Patrick Ogbu
Bio: Chukwuemeka Patrick Ogbu is an academic researcher. The author has contributed to research in topics: Service quality & Integrated project delivery. The author has an hindex of 1, co-authored 3 publications receiving 6 citations.
TL;DR: In this article, a multivariate structural equation modelling technique was used to analyse purposively obtained data from indigenous contractors that recently completed road projects in Nigeria, and it was observed that a significant positive relationship exists between the aggregate project risk, i.e. project risk index of cost and cost performance of the projects.
Abstract: Globally, road projects are notorious for riskiness, which often results in cost overruns. In developing countries, these risks are amplified by economic instabilities and institutional failures. Majority of road projects in these countries are awarded to notedly inept indigenous contractors. Currently, research on the relationship between risks and cost performance of road projects has predominantly focussed on the client’s perspective. Effects of risks on contractors’ cost performance (profit) are inadequately investigated in literature. The purpose of this paper is to determine the relationship between direct risks and cost performance of road projects by indigenous contractors of developing countries from the contractors’ perspective.,The multivariate structural equation modelling technique was used to analyse purposively obtained data from indigenous contractors that recently completed road projects in Nigeria.,It was observed that a significant positive relationship exists between the aggregate project risk, i.e. project risk index of cost (PRIC) and cost performance of the projects. Significant positive relationships were also found to exist between identified cost risk centres and PRIC and between risk factors and cost risk centres. The risk centre site environment and location contributes the most to PRIC.,Indigenous contractors of developing countries are to analyse the identified risk factors and centres prior to bidding for road projects and carefully manage them during project execution.,Future studies of risks in road project should aim to obtain project risk indices of costs for the projects.
TL;DR: In this article, a cross-sectional survey of public sector clients in Nigeria was conducted to ascertain the influence of the factors on client satisfaction, and the results proved that the criteria for the selection of consultants can be grouped into service delivery approach, relationship with the client, the caliber of personnel, firm reputation and firm certification.
Abstract: Purpose To receive a satisfactory consultancy service, a construction client must first select suitable consultants. While numerous criteria for the selection of construction consultants have been suggested in the literature, their influence on client satisfaction has hardly been statistically established. This study aimed to reduce the criteria for the selection of construction consultants into a more manageable set of fewer factors and ascertain the influence of the factors on client satisfaction. Design/methodology/approach Data were gathered through a purposively administered cross-sectional survey of public sector clients in Nigeria. Analyzes were done using relative importance index, factor analysis and multiple regression analysis. Findings The results proved that the criteria for the selection of consultants can, in the order of decreasing influence on client satisfaction, be grouped into service delivery approach (SDA), relationship with the client, the caliber of personnel, firm reputation and firm certification. However, SDA is more influential on client satisfaction. All the factors were found to have significant statistical effects on clients’ overall satisfaction with consultancy services. Originality/value The study demonstrates the extent to which construction consultant selection criteria are relevant to client satisfaction. It shows that SDA is the most important predictor of clients’ satisfaction with consultancy services. The results are helpful for grouping consultant selection criteria in future studies, and in guiding clients on the weights to assign to consultant selection criteria during tender evaluation.
01 Aug 2019
TL;DR: How building information modeling (BIM) in conjunction with other tools, such as the common tools in the Asia and Asia Pacific regions, are used for cost estimation and monitoring is reviewed.
Abstract: Cost overrun has remained a key risk of construction projects that can be prevented by utilizing new technologies. This paper aims to identify the gap in the literature, which can potentially be addressed by using digital tools and technologies, by reviewing the current and state of the art practices. The paper presents the results of a systematic and critical content reviews on cost overruns, to address the question of what factors are affecting the cost overrun. This paper also reviews how building information modeling (BIM) in conjunction with other tools, such as the common tools in the Asia and Asia Pacific regions, are used for cost estimation and monitoring. The paper presents the results of the content review, including their contributions and limitations, which are also used to set key directions for future investigations. A total of 176 papers was identified to develop the construction cost management (CCM) dataset. The method was a mix of systematic reviews, including co-authorship network analyses, co-occurrence analytical map development covering 5671 keywords, and content analysis including theme identification and a critical review of selected papers. The paper critically reviewed 63 selected papers from CCM, which are divided into four clusters based on their scopes: BIM adoption for cost estimation and quantity surveying; BIM implementation for a bill of quantity, risk paths, and cost overruns; cost control and management; and, finally, BIM, virtual design, and value management. A trend analysis using a set of 16 themes (e.g., 3D model, BIM, Decision, Energy, and Life Cycle) for all the papers over the past ten years was developed. The content of each cluster of papers was reviewed based on the frequency of the selected themes in each cluster. The content of each cluster of papers was also reviewed critically and gaps were identified, so a set of directions for future investigations are presented.
TL;DR: In this paper, the authors identify the key challenges impacting the bid decision process by small indigenous building contractors in Dar es Salaam, Tanzania; and establish the strength of their relationship between the pairs of key challenges.
Abstract: Purpose: The acknowledged mode of securing work by contractors is through the bidding process. However, the bidding decisions undertaken by some indigenous contractor’s in developing countries are fraught with challenges that often engender bidding practices (such as collusion through price fixing, and intentional lower bidding), and threaten business survival. Therefore, in the quest to better understand these challenges and viable advocate solutions for overcoming them, this study sought to identify the key challenges impacting the bid decision process by small indigenous building contractors in Dar es Salaam, Tanzania; and establish the strength of their relationship between the pairs of key challenges Design/methodology/approach: A comprehensive literature review was conducted to identify nine challenges impacting the bid decision of indigenous building contractors in Tanzania, which were employed to design a questionnaire survey. Data collected were analysed using descriptive statistics, mean score, inferential statistics (One sample t-tests), Kendall’s concordance and correlation analysis. Findings: Challenges identified from a literature review were empirically tested using survey responses accrued from 33 participating small indigenous building contractors in Dar es Salaam, Tanzania. .The findings illustrate that lack of liquidity, profit returns, lack of equipment, lack of experience of several works and procurement procedures are perceived as being the five most critical challenges. Project location, site accessibility and lack of labour were least critical. The major finding from the correlation analysis was the existence of the strong and positive correlation between ‘project location’ and ‘site accessibility’ Practical implications – Measures for addressing the identified challenges impacting the bidding decisions of the indigenous small building contractors would be undertaken. The findings will enable contractors to not only reconcile the challenges with the industry and in so doing benefit both themselves and the clients, but enable them to be better prepared to deliver contractual obligations but also generate socio-economic wealth. Government and policy makers will also be able to appropriately develop macro interventions for managing these challenges, and which could be custom-tailored to indigenous small contractors. Finally, improving the ability of local firms to compete in the construction industry has been recognized as having the potential of advancing socio-economic development within the comity of developing countries Limitations: The study is limited by its sample and geographical settings which focussed and confined the results on one country, Tanzania. However, the findings can be considered as important for other developing countries wishing to gain insights into the challenges impacting bid decisions. Originality: The study enhances government, client and practitioners’ understanding of the challenges affecting the bidding practices among the indigenous building contractors in Tanzania. This area of investigation has previously been under explored particularly sub-Saharan Africa.
TL;DR: In this article, the authors used a context-based approach to seek project stakeholders' perspectives on the key drivers of cost overrun in highway projects in Nigeria and found that among the key triggers are a delay in work progress, political instability, adverse weather, social issues, delay in progress payment to contractors and modification of project scope.
Abstract: Purpose Extensive research towards identifying the attributable cost overrun factors globally has been conducted predominantly from a survey-oriented perspective, which disregard the contextual basis on which these triggers manifest. This study aims to explore the driving factors of cost overrun in highway projects, specific to the Nigerian context. Design/methodology/approach The research used a context-based approach to seek project stakeholders’ perspectives on the key drivers of cost overrun in highway projects in Nigerian. Semi-structured interviews were conducted with client, contractor and consultant organisations involved in the provision of highway infrastructure projects in Nigeria. The collected data was analysed using a developed coding framework grounded on a case study approach, principles of inductive thematic analysis and saliency analysis to identify the key drivers. Findings Findings from the analysis identified triggers from macroeconomic, societal, leadership and project management perspectives with synergistic relationships with each other based on prevalence and significance. Among the key triggers is a delay in work progress, political instability, adverse weather, social issues, delay in progress payment to contractors and modification of project scope. In conclusion, the triggers of cost overrun in highway projects are contextually driven by the complex nature of the project management, societal, macroeconomic and leadership triggers specific to the Nigerian context. Research limitations/implications The research was limited to only highway infrastructure projects in Nigeria. Furthermore, the findings are based on a small sample size, and thus, caution must be taken before applying the outcome of this study in a generalised way to other contexts. Practical implications Practically, the stakeholders i.e. client, contractors and consultants should acknowledge the contextual circumstances in which each of the triggers takes place, which will aid in developing pragmatic measures and make the right decisions towards addressing these triggers during any highway construction project in Nigeria and enhance the chances of project success. Originality/value The context-based approach applied in this study is expected to provide a new insight in understanding the triggers of cost overruns, especially in highway projects in Nigeria and indeed other developing countries with similar governance characteristics
09 Jul 2021
TL;DR: In this article, a systematic review of the application of the concepts "buildability" and "constructability" in the construction sector and compare the definitions to understand the key constructs and best phase of the construction project for its applicability is presented.
Abstract: Buildability deals with the optimal integration of construction expertise at various project stages to achieve the overall project goals. Incorporation of buildability improves the construction project performance in terms of its cost, quality, productivity, safety, and results early completion. Thus, having a sound understanding of buildability concept is paramount for finding solutions for transforming current practices towards successful project deliveries. The numerous past studies reviewing the concept of buildability in the past have highlighted the interchangeability of the terms “constructability” and “buildability”. However, in some studies, these two terms contradict rather than considered similar. Moreover, the application of the concept of buildability is widely discussed during the design phase while some studies recommend it to be applied in the construction phase. Thus, there is no clear consensus on the clarity of the key constructs of these terms or when to apply buildability. This paper aims to systematically review the application of the concepts “buildability” and “constructability” in the construction sector and compare the definitions to understand the key constructs and best phase of the construction project for its applicability. A structured literature review covering indexed publications from 2011-2021 was carried out to identify the existing literature. Following a Systematic Literature Review (SLR) technique, a total of 38 out of 162 research contributions have been considered for an in-depth analysis. The choice of interpretations, comments, statements, perspectives, and definitions used in 38 studies were examined. The study identified the key constructs of two terms and recommends applying buildability throughout the lifecycle of the project.
TL;DR: The causal model demonstrates that this study is capable of being used to make pragmatic decisions regarding policy leverages about improving cost performance in highway projects provision in the Nigerian highway infrastructure sector of the construction industry.
Abstract: Purpose Empirical evidence suggests that many triggers influence poor cost performance in highway projects, whereas previous studies about the cost overrun triggers stem from a positivist standpoint supported by conventional statistical techniques, thus disregarding the sophisticated interactions and overall dynamics of the triggers. This study contends for a paradigm shift in investigating and understanding cost overrun triggers by adopting a holistic perspective through the lens of system thinking. This study aims to contend for a paradigm shift in investigating and understanding cost overrun triggers by adopting a holistic perspective through the lens of system thinking. Design/methodology/approach Semi-structured interviews with industry stakeholders in Nigeria were conducted buttressed by textual data from literature sources and project documents. Data analysis based on a developed data compatible coding framework and causal relations from textual data sources was used to develop a causal loop diagram depicting the interactions of the triggers which were validated by experts. Findings The analysis of the causal loop diagrams (CLDs) allowed identification of action points used to suggest changes for improved cost-effective highway project delivery. Among the suggested interventions are ensuring the provision of adequate funding prior to contract award will result in timely delivery of projects and indeed delivering key projects at the contractual agreed budget. This can be achieved through ensuring strict adherence to the provisions of Section 4 (2) (b) of the Nigerian Public Procurement Act, 2007 which stipulates that no contract should be awarded if funds are not available from the onset. Research limitations/implications The study was limited to only highway infrastructure projects in Nigeria and as such caution must be taken before using the outcome of the study to other context within Nigeria and beyond. Practical implications From a practical point of view, the causal model demonstrates that this study is capable of being used to make pragmatic decisions regarding policy leverages about improving cost performance in highway projects provision in the Nigerian highway infrastructure sector of the construction industry. Moreover, it will aid a clear understanding of the key influencing triggers of cost overrun by the relevant stakeholders within the highway sector of the industry. Originality/value The hybrid-based approach applied in the development of CLDs in this study is expected to provide new insight into understanding the linkages, interactions, feedbacks and processes among the key cost overrun triggers and suggesting leverages for cost performance improvement within the philosophy of system thinking.