Browsing by Author "Rotimi JOB"
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- ItemA framework for sub-contractor integration in alliance contracts(2012) Vilasini N; Neitzert T; Rotimi JOB; Windapo AO
- ItemA rank order of determinants of construction organisation's performance in New Zealand(Massey University, 2020) Alqudah HE; Poshdar M; Tookey J; Rotimi JOB
- ItemA study of design change management for infrastructure development projects in New Zealand(MDPI AG, 2022-09-19) Wang R; Samarasinghe DAS; Skelton L; Rotimi JOBDesign changes seem to be an inevitable part of engineering, procurement and construction EPC projects. Such changes create a need for a proactive approach to adjusting project scope, cost and time (the triple constraints) for efficiency and effectiveness in overall delivery. This study investigates the causes and implications of design changes in order to improve design change management practices. Data for the study were obtained through online interviews with New Zealand industry practitioners. Thematic analysis was used to collate the results into meaningful data. The study found that design changes were predominantly caused by clients’ inadequate strategic planning, insufficient attention to design, EPC contractors’ inadequate design ability, and on-site variations. There were three categories of such design changes: direct impact on the project, the reciprocal and complementary effect on stakeholders, and the far-reaching impact on the community. The study concludes by suggesting improvements, such as strengthening the integration of project teams to enhance design quality, strategic alignment of stakeholders at the planning stage, early contractor involvement (ECI) between the planning and design phases, and improving collaboration between design and construction teams. Further, a combination of high technical skills (e.g., design ability) and soft skills (can-do attitude, interpersonal skills, problem-solving skills, documentation skills, etc.) are needed to generate the desired improvement in design change management.
- ItemAchieving design-stage elemental cost planning accuracy: Case study of New Zealand(2017) Adafin J; Rotimi JOB; Wilkinson S; Windapo AO
- ItemAdequacy of ventilations systems: Perspectives of designers and occupants of office buildings in Nairobi, Kenya(Academic Journals, 2014) Rotimi JOB; Kiptala RK
- ItemAn ACD diagram developed for simulating a bridge construction operation(2014) Zaeri F; Rotimi JOB
- ItemAn evaluation of risk factors impacting project budget performance in New Zealand(Emerald Publishing Limited, 2021-03-03) Adafin J; Rotimi JOB; Wilkinson SPurpose There has been a lack of research, particularly within the New Zealand (NZ) context, focusing on the identification and assessment of risk factors for construction projects, leading to a wide variation between design-phase elemental cost plans (ECPs) and the outturn tender sums (OTS). Still to be investigated is how risks interact to produce such variability. This study aims to determine the risk-influencing factors, identified through risk measurement, during design development. Design/methodology/approach This study adopted literature review and online questionnaire survey. The literature review was used to identify the factors affecting project budgetary performance, which was used to design the questionnaire survey culminating in data analysis. The questionnaire was administered to 64 practising project managers (PMs) in NZ. Their responses were analysed using descriptive statistics, mean ranking analysis, degree-of-risk measure and correlational analysis, to find the top-five risk factors impacting the variability observed, through ranking the mean and degree of risk values that produce such variability. Findings Significant risk factors were identified from the questionnaire survey analysis, such as changes in project owner/stakeholder requirements, experience of project team, site condition information, competency of consultants and information flow and quality. These provided some insights in explaining the variability between the design-phase ECPs and OTS based on risk impacts from PMs’ viewpoints. Research limitations/implications Findings revealed a drift of 23.86% in budgeted costs (inflated risks), which seems significant. Prioritising top risk factors may provide handy information for researchers on the variables that could be relied upon for the development of a forecasting model for application in NZ. Practical implications The study findings have implications for PMs seeking to provide information on mitigation strategies by using risk management approach, considering the influence of development risks on building project delivery and, consequently the project owner’s financial position. To guard against wide variation between design-phase ECPs and OTS, the main contribution of this study is to raise consultants’ awareness of the important risk factors for their planning at the outset, thus assisting PMs in pro-actively managing their clients' budgets. Originality/value This study creates value by synthesising literature on construction project budgeting and highlighting areas for further research. By giving adequate attention to key risks associated with budget overruns in commercial projects, variability between ECPs and OTS, a common phenomenon in NZ, can be controlled to achieve cost savings. Based on this, further study suggests the development of a model that could assist the stakeholders in NZ to more reliably predict OTS from the design-phase ECP and pro-actively avoid unfortunate budget/cost overruns, disputes and even project abandonment.
- ItemAnalysis of the influence of a strategy-led planning approach on successful construction project implementation(University of Technology Sydney (UTS) ePress, 2015) Rotimi JOB; Ramanayaka CDDThis paper presents arguments for the development of a strategy-led approach to planning and implementation of construction projects. It takes the position that there are deficiencies in traditional planning algorithms, which make them inefficient to cope with the unique character of construction projects. Thus a combination of construction project strategies crafted from experiential knowledge (reflective practice methodologies) and traditional planning algorithms are needed for successful construction project planning and implementation. To confirm the argument, the study investigates the influence of strategies on 35 critical success factors which were identified through literature. It uses a combination of data collected through a questionnaire survey of 40 NZIOB Excellence award recipients for the period 2001 to 2011, and interviews with three subject matter experts to validate the influence of the strategy-led approach towards some selected critical success factors. A correlation analysis shows that there is a positive relationship between increasing project complexity and the use of strategies. Further, content analysis of study information collected suggests that complementary approaches herein referred to as the strategy-led approach is needed to achieve successful project outcomes.
- ItemApplication of green retrofit technology: A systematic review(2020-01-01) Weerasinghe A; Ramachandra T; Rotimi JOBGreen retrofitting is a valuable approach for upgrading existing buildings towards sustainable performances. However, the lack of knowledge about the true cost effects and potential savings of green retrofits distracts building proprietors from paying those retrofits. Therefore, the current study reviewed fourteen studies available in the extant literature and identified twenty-eight different green retrofits incorporated into various buildings with their cost effects and saving potentials through a subsequent desktop study. The results indicated that the majority of green retrofits offer savings related to energy consumption, CO2 emissions, cooling load, and operating costs. Moreover, energy-saving lighting modifications are widely done in most buildings, while solar collectors, photovoltaics, and low-emission double glazing are used less often due to the long payback period and increased cost of implementation. Alternatively, the use of retrofits with lower costs and high savings, like BMS, lighting controllers, and boiler efficiency improvements, offsets the above setbacks. Furthermore, the highlighted retrofits include green roofing, bicycle parks, CO2 sensors, and air tightening retrofits, which also save energy. Rainwater harvesting absorbs carbon dioxide and runoff water, where implementing subsystem-level water meters, appliances with low flow rates, and greywater recycling save and recycle the portable water. Accordingly, the study promotes the effective implementation of green retrofits in future buildings.
- ItemBenefits, constraints and enablers of modular offsite construction (MOSC) in New Zealand high-rise buildings(Emerald, 2023) Shahzad WM; Reddy SM; Kahandawa R; Rotimi JOBPurpose: The ascendancy of modular offsite construction (MOSC) over traditional construction methods is well known. Despite the known potential of this construction approach, its adoption is minimal in New Zealand construction industry. This article investigates the potential benefits of using MOSC for delivery of high-rise buildings in New Zealand, underlying factors responsible for its low uptake and the measures that can facilitate its improved uptake. Design/methodology/approach: This study utilised a mixed research approach. An empirical questionnaire survey was carried out with New Zealand construction industry professionals with expertise in MOSC. Factor analysis of survey data was carried out using SPSS software. Semi-structured interviews were carried out with subject matter experts to get further insights and expand the survey findings. Interview data were analysed using thematic analysis. Findings: Study identified benefits of MOSC, thus establishing potential of its uptake for high-rise building construction. Constraining factors were investigated, most pronounced being low level of skills in construction industry to design, manufacture and integrate supply chain of MOSC, high initial investment, high cost of importing modules and negative perception about offsite manufactured buildings. This study also highlighted the enablers to improve uptake of MOSC. These enablers included; loan and mortgage policies to suit MOSC paradigm, building regulations to support OSC industry, increased support from the government and awareness and acceptance of standardised building designs among the clients. Originality/value: Originality of this paper harps from little to no research carried out to investigate use of MOSC for high-rise buildings in New Zealand context.
- ItemBlockchain technology applicability in New Zealand’s prefabricated construction industry(2022-03-30) Bakhtiarizadeh E; Shahzad W; Poshdar M; Rotimi JOBDifferent industries are modernising their systems and introducing innovations to their management practices. However, the construction industry is recognised for its lack of technological systems on which the success of this sector is deemed to be heavily dependent. Previous studies have focused on enhancing the off-site construction supply chain. However, studies on the importance and utilisation of technology in this sub-sector are scarce, predominantly where the efficiency of off-site supply chain management is stalled as a consequence of the slow implementation of technology. Thus, this article employs an exploratory approach by providing insight into the applicability of blockchain technology in New Zealand's off-site construction and demonstrates the benefits associated with the adoption of this technology. A literature review was used to identify stakeholders' interrelationships in different stages of prefabrication projects. Then, a pilot interview from industry experts followed by a questionnaire survey was used to determine the involvement of stakeholders in different phases and the benefits that blockchain technology can bring to this industry. The results indicate that using blockchain as a secure information management system could improve the integration of prefabrication supply systems by producing a collaborative atmosphere amongst the organisations involved.
- ItemBusiness environment, CRM, and sustainable performance of construction industry in New Zealand: A linear regression model(MDPI AG, 2021) Alqudah HE; Poshdar M; Oyewobi L; Rotimi JOB; Tookey JIncreasing fragmentation of the construction industry makes it riskier and more competitive. Construction management researchers have become intrigued by the factors influencing performance differentials due to such fierce competition. This study examines the relationships between the business environment and customer relationship management and their effect on construction organisations sustainable performance. It develops a model to explain performance differential between construction organisations in New Zealand by using the linear regression technique. A questionnaire was administered to professionals within construction organisations. A total of 101 usable responses were analyzed for descriptive statistics and correlations. Following the balanced scorecard performance metric, the organisations’ sustainable performance was measured using customers, financials, internal processes, and growth and learning metrics. Results indicated that environmental dynamism had a significant regression with internal business processes and perspectives on learning and growth, with 0.259 and 0.607, respectively. CRM was significantly associated with financial (0.327), customer (0.373), and internal business process (0.451) perspectives. This study provides an integrative framework to construction enterprises, and determinants of organisational sustainable performance, which are substantial developments in the current literature on CRM practices. Given the significance of the construction sector to the global economy, ecology, and social well-being, its sustainable performance can lead to a sustainable future for communities.
- ItemCauses of payment problems in the New Zealand construction industry(University of Technology Sydney (UTS) ePress, 2015) Ramachandra T; Rotimi JOBPayment delays and losses persist in the construction industry and continue to be a key concern to industry practitioners. Therefore an exploration of the key causes of payment delays and losses is undertaken in this study with the ultimate objective of seeking mitigating solutions. The study adopted a survey approach using an online questionnaire, administered to practitioners from the New Zealand construction industry, comprising consultants, head contractors and subcontractors. The data obtained was analysed using inferential statistical techniques, including comparing means and factor analysis. Factor analysis enabled clustering of the inter-related causes of payment delays and losses in order to find reduced number of causes. Accordingly, the study found that payment problems mainly relate to contractual issues, financial strength of industry players, disputes, short-comings of payment processes and ‘domino effects’. Among them, the financial strength of critical industry players was considered central to payment problems. The study concludes that any solution to these problems must address these primary causes, as a rational starting point. Thus procuring a feasible form of financial security at the outset of a project, and the pre-qualification of the financial status of critical project participants, were found to be significant in the mitigation of construction payment risks
- ItemComparative Life-Cycle Cost (LCC) study of Green and Traditional Industrial Buildings in Sri Lanka(Elsevier, 2021) Weerasinghe AS; Ramachandra T; Rotimi JOB
- ItemConstruction project performance: The role of client knowledge and procurement systems(Emerald, 2021) Windapo A; Adediran A; Rotimi JOB; Umeokafor NPurpose: This study aims to investigate whether clients’ knowledge about construction procurement systems influence project performance objectives and the role of procurement systems on project performance objectives in South Africa. Design/methodology/approach: Using a two-round survey, 90 usable questionnaires from construction professionals in South Africa plus 3 expert clients were collected. The data were analysed using descriptive statistics – means, percentages and the analytical hierarchy process to determine the rank of client project performance criteria, while inferential statistics – Pearson product-moment correlation was used in establishing the relationship between the level of clients’ knowledge and project performance. Findings: It was found that the common procurement systems used are traditional, followed by management-oriented and integrated procurement systems. In addition, it emerged that client’s knowledge of procurement systems shows a positive relationship with the achievement of project performance objectives. Based on these findings, it is concluded that some procurement systems being selected by clients in South Africa are inappropriately selected. This is despite the emergence of more efficient procurement systems. If procurement systems are selected based on the knowledge of the client, it will give better chances of a successful project outcome. Practical implications: The research suggests the need for clients to seek ways to improve their understanding or increase their knowledge of procurement systems in construction. Policymakers’ responsibilities in driving policies that will place responsibilities on clients to seek a reasonable way to improve their knowledge where possible is implied in the study. Originality/value: It contributes to improving project performance by examining whether the level of knowledge possessed by a client influences project performance.
- ItemDoes leadership style differ between a post-disaster and non-disaster response project? A study of three major projects in New Zealand(MDPI (Basel, Switzerland), 2019-09) Witton F; Rasheed EO; Rotimi JOBPurpose–The leadership styles of three major infrastructure projects within New Zealand were determined and comparatively analysed to ascertain whether the leadership style employed in a post-disaster recovery project would differ significantly from a normal infrastructure project. A multifactor leadership questionnaire was administered to project leaders and personnel of the three infrastructure projects. The statistically significant differences (p < 0.05) in leadership styles were determined using one-way ANOVA analytical tool in STATISTICA 13. Results showed all three projects have strong transformational and transactional leadership traits. There were similarities in leadership style amongst the projects. None of the projects had a significant laissez-faire leadership style. Hence there is no significant difference in leadership style between a disaster recovery project and a normal project. Plausible reasons and implications are provided to support these findings. This study provides insight into leadership styles employed in projects in New Zealand, which could assist in the decision-making process for new and existing projects. Future studies could investigate the effect a combination of leadership styles will have on project success and staff retention. More studies are required across New Zealand to verify the generalizability of the current study findings.
- ItemEnvironmental and socio-psychological drivers of building users’ behaviours: A case study of tertiary institutional offices in Auckland(Emerald Publishing, 2022) Weerasinghe AS; Rasheed EO; Rotimi JOBPurpose: Better identification of comfort preferences and occupant behaviour drivers is expected to improve buildings’ user-centred designs and energy operations. To understand the underline drivers of occupant behaviours in office buildings, this study aims to evaluate the inter-relationships among occupant energy behaviours, indoor environmental quality satisfaction, user control and social-psychological factors influencing occupant behaviours in New Zealand offices. Design/methodology/approach: Using an occupant perception survey, this study identifies the occupant behaviour patterns based on multi-domain comfort preferences. A case study was conducted in five office spaces of a university in Auckland, New Zealand. Data were collected from 52 occupants and analysed using descriptive and binary logistic regression analysis. Indoor environmental quality, user control, motivational, opportunity and ability factors were the independent variables considered. A model to predict the behaviours using environmental, building and social-psychological aspects was developed. Findings: The results showed that the primary sources of indoor environmental quality discomfort were related to thermal and air quality, while occupants’ indoor environmental quality satisfaction correlated with their comfort preferences. The outcomes emphasise how the connection between building systems and occupants’ comfort preferences affect the choice of occupant behaviours in offices. Also, the primary occupant behaviours were drinking hot and cold beverages, opening/closing windows and internal doors and adjusting clothing. The binary logistic regression analysis showed that occupants’ perceived user control satisfaction is the main driver for increasing window actions. No other independent variable showed a statistically significant association with other behaviours. Originality/value: This study adopted a novel approach to assess the combined effects of comfort preferences, occupant energy behaviours and various environmental, building and socio-psychological factors for modelling energy-saving behaviours in office buildings.
- ItemImpact of social media usage on performance of construction businesses (CBs) in Abuja-Nigeria(Emerald Publishing Limited, 2021-07-27) Oyewobi LO; Olorunyomi OS; Jimoh RA; Rotimi JOBPurpose Many construction businesses are currently building and keeping social media pages for their enterprises to be visible to the public to improve their social interaction, promote business interest, build trust and relationships with their targeted audience on social media. The purpose of this study is to examine the impact of social mediausage on performance of construction businesses (CBs) in Abuja, Nigeria. Design/methodology/approach This study used a quantitative research approach by identifying constructs that reveal three aspects of organisation’s physiognomies that impact the process of espousing, implementing and using technological innovations in conducting businesses. Well-structured questionnaire was used to obtain data from 113 purposively sampled building materials’ merchant operating in Dei-Dei Market, Abuja, Nigeria. This study used partial least squares structural equation modelling technique to establish the relationship among the constructs. Findings The results of this study indicated that technology has significant relationship with social media adoption, whereas social media adoption has a very strong positive impact on organisation’s performance (P < 0.001) with respect to improved customer relations and services and enhanced information accessibility. Research limitations/implications This study has implications for CBs that wish to adopt social media to promote their businesses by presenting to them the opportunity to understand the impact of technology, environment and organisational potential in improving business performance. This study is cross-sectional in nature, and this calls for caution in interpreting the results. Originality/value This paper developed and tested a conceptual framework presented to understand the interrelationships amongst the constructs, which would be of great significance to business owners in developing their social interaction and promote business interest via social media. The outcome of this research is beneficial to researchers to further study how the different social media tools could help in influencing business decisions.
- ItemInvestigating the relationship between reworks and contractual claims: The salience of contract conditions(American Society of Civil Engineers, 2022-02-01) Asadi R; Rotimi JOB; Wilkinson SStatistics show a high rate of contractual claims in construction projects, impacting the construction industry's progress negatively. Rework is one of the main underlying factors that generate contractual claims. Rework and contractual claims follow a mutual routine. Despite a large number of studies on the causes and impacts of rework on project performance, there has been limited research examining the relationship between claims and rework on the basis of contract documents. The paper first attempts to expose the sources of rework through a systematic literature review and then assesses rework causes that fail to be addressed in construction contract documents. The review results identified 37 root causes as the most common rework contributors to construction projects classified into five groups. The list of rework causes served as a starting point for searching the contractual issues through a questionnaire survey. Accordingly, a relative importance index was used for analysis of the primary data collected from the survey. The result first prioritized the importance level of rework causes in generating contractual claims, preceding rework causes that are not addressed adequately through standard form of contract conditions in construction projects. Findings of the investigations revealed that the general conditions of contract do not address the causes of rework adequately. Therefore, contract documents need improvement to cover contractual claims incidences due to rework. Lack of addressing rework causes in the general conditions of contract triggers recommendations for revising the contract clauses that ultimately lead to improved claim handling and dispute avoidances.
- ItemKnowledge transfer and management in the construction industry: Trends and future challenges(Massey University, 2022) Moshood TD; Rotimi FE; Rotimi JOBThis study aims to determine the current issues associated with the transfer of knowledge in the construction industry published between 1987 and December 2021 to provide insights and ideas for future research. A total of 1240 publications were analysed to offer metadata analysis, and these papers were extracted from the Scopus database. The insights gained from analysing papers from Scopus databases are presented along with classifications of the literature based on content analyses, including conceptual understanding, barriers and facilitators, a collaborative effort with knowledge management and other optimisation models, and evaluation of knowledge management practices and performance. The study's findings show a declining trend in research on drivers or obstacles analysis of knowledge management. In contrast, there is a growing trend in applying mathematical optimisation models to enhance decision-making in pursuing knowledge management performance. Furthermore, the study's findings reveal a steady increase in assessing knowledge management techniques and performance over time. Contributions by disciplines are identified, and the most significant authors, leading journals, leading nations, leading contributing institutions, and leading contributing institutions. The study's results and future research possibilities open up a new channel for further inquiry and contribution to this subject.