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A Delphi technique approach of identifying and validating subsidised low-income housing satisfaction indicators

- Aigbavboa, Clinton

  • Authors: Aigbavboa, Clinton
  • Date: 2015
  • Subjects: Delphi technique , Housing satisfaction , Inductive approach
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://ujcontent.uj.ac.za8080/10210/364604 , http://hdl.handle.net/10210/73318 , uj:18394 , Citation: Aigbavboa, C. 2015. A Delphi technique approach of identifying and validating subsidised low-income housing satisfaction indicators.
  • Description: Abstract: This paper reports on the practical experience of the researchers on the adoption of the inductive approach to knowledge diffusion through the use of the Delphi technique approach. The Delphi method is an essential technique of reaching consensus by experts on issues that cannot be resolved in a once off discussion. The research commenced with an extensive review of existing literature in order to identify the core and sub-variables which depicts housing satisfaction, to develop a Delphi questionnaire that was used in the Delphi study. A three iterative round Delphi technique was conducted to attain consensus of the identified housing satisfaction indicators. The experts used for this study were identified from different sources. The sources included the South African institutions of higher learning faculties, research institutes, the South Africa Department of Human Settlement, conference keynote speakers related to housing and human settlement issues in workshops, and individuals who have committed their lives working on the area of sustainable human settlement and housing related issues in South Africa. After three iterative Delphi rounds, consensus was achieved on the identified core-and sub-indicators identified from the literature and other added variables as suggested by the experts during the Delphi process. This study encourage the use of the Delphi technique as a method to achieve consensus in areas where consensus has not been reached such as in housing satisfaction studies to identify indicators for subsidised housing development in South Africa. The author argues that the Delphi method is a comprehensive method of attaining consensus on challenging issues of housing satisfaction; however, the technique requires proper communication management in order to achieve the required results.
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A Delphi technique approach towards the need for and relevance of construction project monitoring and evaluation practices

- Tengan, Callistus, Aigbavboa, Clinton

  • Authors: Tengan, Callistus , Aigbavboa, Clinton
  • Date: 2017
  • Subjects: Delphi technique , Ghana , Monitoring and evaluation
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/254494 , uj:26641 , Citation: Tengan, C. & Aigbavboa, C. 2017. A Delphi technique approach towards the need for and relevance of construction project monitoring and evaluation practices.
  • Description: Abstract: The practical experience of the researchers on the implementation of the inductive methodology to knowledge dissemination using the Delphi technique approach is reported in this study. The Delphi method is a vital procedure of reaching consensus on issues that cannot be resolved in a once-off discussion. The research commenced with five questions to ascertain the views of experts with the aim of reaching consensus on the need for and relevance of monitoring and evaluation (M&E) implementation in achieving project success in Ghana’s construction industry. Experts for the study were identified from the Ghanaian construction industry (quantity surveyors, architect, and engineers), research, and academic institutions of higher learning faculties in Ghana. After two iterative Delphi rounds, consensus was achieved on the need for and relevance of M&E to achieve project success as suggested by the experts during the Delphi process. Based on the difficulties faced in the process, the study recommends clear and concise instructions to Delphi experts on the process. Also, the length of the structured Delphi questionnaire should be as short as possible to ensure a high response rate with a constant reminder to experts before the close of the submission of responses. In conclusion, the authors argue that the Delphi technique is vital for studies in areas where consensus on the need for and relevance of construction project management practices is yet to be reached.
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A dialogue on the genesis of housing problems in South Africa

- Aigbavboa, Clinton

  • Authors: Aigbavboa, Clinton
  • Date: 2016
  • Subjects: Housing backlog , Land issues , Natives
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/215356 , uj:21409 , Citation: Aigbavboa, C. 2016. A dialogue on the genesis of housing problems in South Africa.
  • Description: Abstract: A shallow synopsis of the current South Africa housing backlog crisis points straight at corrupt practices, the inefficiency and lack of capacity of the present and previous post-apartheid government to adequately address the maddening housing problem in the country. But a sincere overview will reveal that the present housing crisis has its origin in the 1913 Natives’ Land Act that severely limited the land that those previously classified as natives in South Africa could own. The Native’s Land Act, though now abolished, entrenched a land tenure system and limited the alienability of land to 13% for the natives who are the majority of the South Africa population. Today, millions of South African households live in slum housing patterns, hostels and crowded houses in marginalised townships and informal settlements awaiting access to government-availed land and houses because of consequences of the formerly enacted Natives’ Land Act of 1913. Though the South African government and other stakeholders, since the attainment of democratic governance in 1994, have been creating and implementing various housing delivery programmes to speedily meet demand. This study is conducted with reference to existing theoretical literature, published and unpublished research. It is mainly a literature review on the role of the colonial edicts that fostered a culture of housing under-development and eventually an enormous housing shortage that the present government is battling to eradicate. Findings from the study reveals that since 1910 to the end of the segregation rule in 1994, various approaches were used to advance the inhumane idea to restrict a majority of South Africans from owning properties. With a particular emphasis to the Native Land Act 27 of 1913; this Act was concerned with land issues, and since land and housing issues are inextricably linked, this affected the provision of housing for Blacks and other disadvantaged ethnic groups. Further findings revealed that the enactment of the Native Land Act 27 of 1913, cemented housing policy issues in the apartheid era, which created the divide in housing issues which have not be completely reversed till date. However, apartheid policies alone cannot be held responsible for the housing backlog in South Africa, but equally no account of housing backlog and conditions can be credible if we do not take into account the history of South Africa and its colonial policies.
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A holistic assessment of construction and demolition waste management in the Nigerian construction projects

- Aboginije, Ademilade, Aigbavboa, Clinton, Thwala, Wellington

A qualitative assessment of the delivery of subsidised low income houses

- Nkosi, Jabulane, Aigbavboa, Clinton, Thwala, Wellington Didibhuku

A stakeholder perspective on the implementation of sustainable construction practices

- Mashwama, Nokulunga Xolile, Thwala, Didibhuku, Aigbavboa, Clinton, Hamma-Adama, Mansur

A survey of machine learning methods applied to anomaly detection on drinking-water quality data

- Dogo, Eustace M., Nwulu, Nnamdi I., Twala, Bhekisipho, Aigbavboa, Clinton

  • Authors: Dogo, Eustace M. , Nwulu, Nnamdi I. , Twala, Bhekisipho , Aigbavboa, Clinton
  • Date: 2019
  • Subjects: Machine learning , Anomaly detection , Deep learning
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/406768 , uj:34213 , Citation: Dogo, E.M. et al. 2019. A survey of machine learning methods applied to anomaly detection on drinking-water quality data.
  • Description: Abstract: Traditional machine learning (ML) techniques such as support vector machine, logistic regression, and artificial neural network have been applied most frequently in water quality anomaly detection tasks. This paper presents a review of progress and advances made in detecting anomalies in water quality data using ML techniques. The review encompasses both traditional ML and deep learning (DL) approaches. Our findings indicate that: 1) Generally, DL approaches outperform traditional ML techniques in terms of feature learning accuracy and fewer false positive rates. However, is difficult to make a fair comparison between studies because of different datasets, models and parameters employed. 2) We notice that despite advances made and the advantages of the extreme learning machine (ELM), application of ELM is sparsely exploited in this domain. This study also proposes a hybrid DL-ELM framework as a possible solution that could be investigated further and used to detect anomalies in water quality data.
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A theoretical assessment of causes of job insecurity in the construction industry

- Mathebula, Lerato, Mukuka, Mulenga, Aigbavboa, Clinton, Thwala, Wellington Didibhuku

  • Authors: Mathebula, Lerato , Mukuka, Mulenga , Aigbavboa, Clinton , Thwala, Wellington Didibhuku
  • Date: 2015
  • Subjects: Insecurity , Job insecurity , Construction industry
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/73303 , uj:18392 , Citation: Mathebula, L. et al. 2015. A theoretical assessment of causes of job insecurity in the construction industry.
  • Description: Abstract: The construction industry has been dealing with drastic changes over the past years, changes that result in a number of negative consequences one of them being job insecurity. These changes concern issues such as increased economic dependency between countries, rapidly changing consumer markets and escalated demands for flexibility within as well as between organisations. However, it is an organisations’ responsibility to manage the changes accordingly to avoid issues such as job insecurity. Hence this paper theoretically discuses job insecurity in the construction industry. The study was conducted with reference to existing theoretical literature, published and unpublished research. The study is mainly a literature review/survey on job insecurity in the construction industry. Literature revealed that employment downsizing, financial crisis, lack of experience and training, technological changes, racism, gender and lack of education were the major causes of job insecurity in the construction industry. The current study is a theoretical assessment of job insecurity in the construction industry and the study contributes to the body of knowledge on the subject of job insecurity in the construction industry.
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A theoretical assessment of the effect of training and development on employees performance and productivity

- Ngwenya, Lerato, Aigbavboa, Clinton, Thwala, Wellington Didibhuku

A theoretical review of building life cycle stages and their related environmental impacts

- Ngwepe, Lusca, Aigbavboa, Clinton

  • Authors: Ngwepe, Lusca , Aigbavboa, Clinton
  • Date: 2015
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/69042 , uj:17810 , Citation: Ngwepe, L. & Aigbavboa, C. 2015. A theoretical review of building life cycle stages and their related environmental impacts.
  • Description: Abstract: There six life cycle stages of buildings are: raw material extraction; manufacturing; construction; operation and maintenance; demolition; and disposal, reuse or recycling. The life cycle stages of a building are all intensively involved, in that the use of natural resources, energy and water are consumed in each of them. This paper investigate the environmental impacts across each of these stages. Furthermore, the paper also highlight the role the building sector on the total global environmental impacts in terms of the building sector’s contribution to waste generation, pollution, amongst others. This is done in order to encourage and to inform ways which can be incorporated into the building sector in order to reduce their impact on the environment. The study is conducted with reference to existing theoretical literature, published and unpublished research. The study is mainly a literature review/survey on the life cycle stages of a building. The key findings from the study are that energy is consumed across all the stages of a building. Environmental impact such as greenhouse gas emissions, waste generation and pollution etc. associated with a building are declared to be of a great quantity due to many and relatively long life cycle stages a building have. This study is valuable to the South African built environment, construction industry, infrastructure development and/or sustainable urban development.
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A theoretical study on leadership theory categories in the construction industry

- Liphadzi, Murendeni, Aigbavboa, Clinton, Thwala, Wellington Didibhuku

Accessing imbalance learning using dynamic selection approach in water quality anomaly detection

- Dogo, Eustace M., Nwulu, Nnamdi I., Twala, Bhekisipho, Aigbavboa, Clinton

  • Authors: Dogo, Eustace M. , Nwulu, Nnamdi I. , Twala, Bhekisipho , Aigbavboa, Clinton
  • Date: 2021
  • Subjects: Classification , Imbalance learning , Dynamic selection
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/478606 , uj:43260 , Citation: Dogo, E.M.; Nwulu, N.I.; Twala, B.; Aigbavboa, C. Accessing Imbalance Learning Using Dynamic Selection Approach in Water Quality Anomaly Detection. Symmetry 2021, 13, 818. https://doi.org/10.3390/ sym13050818
  • Description: Abstract: Automatic anomaly detection monitoring plays a vital role in water utilities’ distribution systems to reduce the risk posed by unclean water to consumers. One of the major problems with anomaly detection is imbalanced datasets. Dynamic selection techniques combined with ensemble models have proven to be effective for imbalanced datasets classification tasks. In this paper, water quality anomaly detection is formulated as a classification problem in the presences of class imbalance. To tackle this problem, considering the asymmetry dataset distribution between the majority and minority classes, the performance of sixteen previously proposed single and static ensemble classification methods embedded with resampling strategies are first optimised and compared. After that, six dynamic selection techniques, namely, Modified Class Rank (Rank), Local Class Accuracy (LCA), Overall-Local Accuracy (OLA), K-Nearest Oracles Eliminate (KNORA-E), K-Nearest Oracles Union (KNORA-U) and Meta-Learning for Dynamic Ensemble Selection (META-DES) in combination with homogeneous and heterogeneous ensemble models and three SMOTE-based resampling algorithms (SMOTE, SMOTE+ENN and SMOTE+Tomek Links), and one missing data method (missForest) are proposed and evaluated. A binary real-world drinking-water quality anomaly detection dataset is utilised to evaluate the models. The experimental results obtained reveal all the models benefitting from the combined optimisation of both the classifiers and resampling methods. Considering the three performance measures (balanced accuracy, F-score and G-mean), the result also shows that the dynamic classifier selection (DCS) techniques, in particular, the missForest+SMOTE+RANK and missForest+SMOTE+OLA models based on homogeneous ensemble-bagging with decision tree as the base classifier, exhibited better performances in terms of balanced accuracy and G-mean, while the Bg+mF+SMENN+LCA model based on homogeneous ensemble-bagging with random forest has a better overall F1-measure in comparison to the other models.
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Adoption of smart structures for prevention of health hazards in buildings

- Oke, Ayodeji, Aigbavboa, Clinton, Ngema, Wiseman

An assessment of critical success factors for the reduction of the cost of poor quality from construction projects in South Africa

- Aigbavboa, Clinton, Thwala, Wellington Didibhuku

An assessment of occupants’ expectation in the delivery of low-income housing in South Africa

- Aigbavboa, Clinton, Thwala, Wellington Didibhuku

  • Authors: Aigbavboa, Clinton , Thwala, Wellington Didibhuku
  • Date: 2012
  • Subjects: Housing subsidy beneficiaries , Housing , Low-income housing
  • Type: Article
  • Identifier: uj:5324 , ISSN 9781405156486 , http://hdl.handle.net/10210/8235
  • Description: Low-income housing provision has been a major focus of the government in postapartheid South Africa. While success can be noted, there is a growing concern on the housing expectations and satisfaction of the housing occupants. Utilizing postoccupancy survey conducted in four locations that had benefited from the government housing subsidy scheme, the research identifies how the expectations of the occupants of low-income housing can be met in the Gauteng Province of South Africa. The results from the post-occupancy survey revealed that most of the beneficiaries housing needs were not met, as a majority of the respondents informed that they had expected bigger units; however, when they were allocated the houses, the expectation was not met. Though, a major obstacle while the respondents expectation was not met pointed toward the lack of consultation between the Department of Human Settlement and the occupants. A comparison is also made to ascertain the correlation between meeting of occupants' expectation and the maintenance of the houses. It is suggested that the Department of Human Settlement should conduct occupants need assessment on future housing project to be developed and on a consistence basis should employ post-occupancy survey to inform, improve and guarantee the expectation and housing satisfaction of the beneficiaries of subsidised housing units in South Africa.
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An assessment of the barriers hindering remanufacturing processes in Nigeria

- Ohiomah, Ifije, Aigbavboa, Clinton

An assessment of the critical success factor for the reduction of cost of poor quality in construction projects in Swaziland

- Mashwama, Nokulunga, Aigbavboa, Clinton, Thwala, Wellington Didibhuku

An assessment of the evolution of housing policy framework

- Aigbavboa, Clinton

  • Authors: Aigbavboa, Clinton
  • Date: 2015
  • Subjects: Low-income , Developing countries
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/88022 , uj:19658 , Citattion: Aigbavboa, C. 2015. An assessment of the evolution of housing policy framework.
  • Description: Abstract: Globally, housing policies have been used as an attempt to try and address housing problems, particularly in respect to the low-income earners, with the view of helping them access better housing. The evolution of housing policy in developing countries has been studied and identified in different ways, however, this paper present a robust theoretical background of the developments in housing policy framework. The data used in this paper were derived from secondary sources only; through a detailed review of related literature on the subject to meet the research objectives. The study is an in-depth literature exploration of the theoretical perspective of the housing studies framework. The literature reviewed found that the theory of housing had its origin in the Paleolithic period when homo-sapiens began to use natural materials like stone, wood, leaves, animal skin and other similar items to create shelter from elements of weather. It was also found that there are various theoretical perspective frameworks that have been used in the study of housing, such as political; social; developmental; institutional; and radical perspectives amongst others. This study provides a robust theoretical framework used in housing study.
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An assessment of the key determinants of building science students’ satisfaction when undertaking group work: a case study of the University of Johannesburg, South Africa

- Aigbavboa, Clinton, Thwala, Wellington Didibhuku

  • Authors: Aigbavboa, Clinton , Thwala, Wellington Didibhuku
  • Date: 2013
  • Subjects: Team work , Students’ satisfaction , University of Johannesburg. Students
  • Type: Article
  • Identifier: uj:4874 , ISSN 978-0-9566060-6-8 , http://hdl.handle.net/10210/12550
  • Description: This study assesses university’s students’ views on team work. The specific research aim is to investigate the factors that affect students’ satisfaction when undertaking group work. The data used in this paper were derived from both primary and secondary sources. The secondary data was collected via a detailed review of related literature. The primary data was collected through a structured questionnaire aimed at 55 BTech (undergraduate final year) students. Data received from the questionnaires was analysed using descriptive statistics procedures. Findings from the study revealed that the most important factors which affect students’ satisfaction when undertaking group works are: students having the same attitude towards work; ground rules for the operation of the group; some students do not come to group meetings and not all students contribute to the group assignments. This study reveals the key determinants of students’ satisfaction when undertaking group work, hence preparing the students to be team players before they enter the world of work.
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An examination of the key drivers of amendments to the standard forms of contract in the South African construction industry

- Mewomo, Modupe Cecilia, Aigbavboa, Clinton, Lesalane, Portia

  • Authors: Mewomo, Modupe Cecilia , Aigbavboa, Clinton , Lesalane, Portia
  • Date: 2018
  • Subjects: Amendments , Contracting , Drivers
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/288077 , uj:31216 , Citation: Mewomo, M.C., Aigbavboa, C. & Lesalane, P. 2018. An examination of the key drivers of amendments to the standard forms of contract in the South African construction industry. Journal of Construction in Developing Countries, 23(1): 115–124. https://doi.org/10.21315/jcdc2018.23.1.7.
  • Description: Abstract: Some of the perceived benefits of standard forms of contract are standardisation, uniformity, stability and the availability of well-established terms and conditions which allow predictability and greater certainty in legal relations. Thus, the standard forms are widely adopted in the construction industry to facilitate the contractual arrangements between contracting parties in a construction project. Having become commonplace in construction transactions, they are often generally accepted by the various contracting parties and their advisers. Notwithstanding its importance, literature suggests that it is practically unfeasible to devise a standard form of contract that would cater for all eventualities and construction issues that might occur in construction projects. As a result, the existing standard forms are sometimes amended or modified in order to fit the clients' requirements and also to suit the contractors' expectations. This paper therefore investigates the key factors that drive amendments to the standard forms of contract in the South African construction industry. Considering the fact that this paper presents findings that relied on a descriptive survey method, the mean item score was used for presenting the results. The data was obtained through an online questionnaire survey sent to the construction professionals who are usually involved in the selection of contract forms for the client in the Gauteng Province of South Africa (SA). The data was analysed using the statistical package for the social sciences (SPSS) and the results indicate that "altering risk allocation", "inserting additional obligation" and "correcting something which is not applicable" are the three prominent factors that highly drive the amendment of standard forms of contract in the Gauteng Province of South Africa.
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