Faculty of Design and Creative Technologies (Te Ara Auaha)
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The Faculty of Design and Creative Technologies (Te Ara Auaha) is comprised of four school; Colab, the School of Art and Design, the School of Communication Studies and the School of Engineering, Computer and Mathematical Sciences. It also has Institutes, Centres and Labs across the Arts and Sciences in a mix that blends the traditional and the new, praxis and theory.
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Browsing Faculty of Design and Creative Technologies (Te Ara Auaha) by Author "Adafin, J"
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- ItemAn exploration of theoretical concepts and methods for assessing risk impacts on the variability between design stage elemental cost plan and tender sum(Commission of the International Council for Research and Innovation in Building and Construction, 2014) Adafin, J; Wilkinson, S; Rotimi, JOB; Odeyinka, HReliable prediction of final tender sums of building projects from the cost plan has posed challenges for construction industry practitioners in New Zealand, especially Quantity Surveyors. No matter how much care and effort is put into the preparation of design stage elemental cost plans, significant deviations are usually observed between these cost plans and the final tender sum. The major reason for this deviation is the risk inherent in both design and construction. This study is a literature-based theoretical exploration and part of an on-going doctoral research aimed at assessing the impacts of risk on the variability between design stage elemental cost plan and final tender sum. This paper first provides a review of the risk elements inherent in preparing the design stage elemental cost plan by demonstrating the theoretical context. Also, it develops a methodology for assessing risk impacts on the variability between the design stage elements cost plan and final tender sum. The insights gained from the foregoing steps then helped in devising theoretical concepts for securing the design stage elemental cost plan as a reliable budgetary tool that guarantees cost certainty for building projects, and also a methodological frame-work for assessing the variability between the design stage elemental cost plan and final tender sum.
- ItemEvaluating the budgetary reliability of design stage elemental cost plan in building procurement: a New Zealand study(Department of Construction Economics and Management University of Cape Town, Cape Town, South Africa, 2016) Adafin, J; Wilkinson, SJ; Rotimi, JOB; Odeyinka, HAAccurate prediction of final tender sums (contract sums) of building projects depends on reliable projections of baseline cost plans developed at the design development stage. However, no matter how much care and effort is put into the preparation of design stage elemental cost plans, deviations are usually observed between these cost plans and the final tender sum. This makes accurate predictions challenging for construction practitioners in New Zealand. The major attributable factors for the observed variability are inherent risks in the design stage elemental cost plan development. Whilst this is recognised, this study evaluates the reliability of elemental cost plans in traditional building procurement. The study seeks to answer the question: is elemental cost plan a reliable budgetary tool for construction projects? The study was undertaken based on 20 completed building projects from which secondary data were collected within the New Zealand construction industry. Data analysis was carried out using document analysis and percentage deviation of final tender sums from the cost plans. Further analyses were carried out using root mean square and relative mean absolute deviation methods of analyses. The results showed that the budgetary reliability of elemental cost plans varied depending on project types. Whilst a deviation of -3.67% and +3.95% was obtained on the residential projects analysed, the deviation on educational projects was between -3.98% and +12.15%. Commercial projects attracted -14.22% and +16.33% while in the case of refurbishment projects, a deviation of -10.07% and +30.14% was obtained. These findings suggest that the larger or more complex a project is, the less reliable it is to use elemental cost plans to guarantee cost certainty.
- ItemRisk-contingency fund in the design stage elemental cost planning function: a theoretical exploration(Australasian Universities Building Education Association (AUBEA), 2013) Adafin, J; Wilkinson, S; Rotimi, J.O.B.Effectiveness of contingency fund management can strongly influence project success as contingency is proportional to the risk present in a project. However, the traditional allocation of a contingency fund in construction projects using lump sum or percentage addition method to cover risks in elemental cost plans and tenders has been challenged and criticized leading to the evolution of analytical and scientific methods. Therefore, the purpose of this study is to signify design stage elemental cost planning as a function of risk-contingency fund. The work presented in this paper is a literature-based theoretical exploration, and a preliminary stage of an on-going doctoral research on the budgetary reliability of design stage elemental cost plan. As a first step, a detailed review of related literature was made to establish the risks inherent in preparing the design stage elemental cost plan. Secondly, various contingency fund estimation methods available for application in construction practice were identified by demonstrating the theoretical context. The insights gained from the foregoing steps then helped in devising theoretical concepts for securing elemental cost plan as a reliable budgetary tool for construction projects through risk-contingency analysis that guarantees cost certainty.