Construction Technology and Management

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Browsing Construction Technology and Management by Author "Abebe Dinku"

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    Analytical Hierarchy Process-Based Multi-Criteria Decision Analysis for Contractor Selection: A Case of Ethiopian Road Administration
    (Addis Ababa University, 2024-11) Eden Mershaye Tessema; Abebe Dinku
    Selecting a contractor is a crucial task for any client. The success of a project is likely to be compromised in the absence of an appropriate and accurate process for choosing the best contractor. This study looks at the analytical hierarchy process (AHP) as a model for decision-making while choosing a contractor. This methodology can help project management teams choose contractors based on criteria other than the lowest bid; it can help them discover contractors who are most likely to produce good results. Further, the study tests an AHP-based model on a real-world scenario whereby potential contractors are assessed. Primary and secondary data sources are both used in the research. A questionnaire was utilized by the researcher to get primary data, while document reviews and extensive literature reviews were used as secondary data to determine the contractor selection criteria to select contractors for road projects. The Analytical Hierarchy Process (AHP) was used to analyze the collected data, which involved identifying 23 sub-criteria under four major categories: financial competency, past performance competency, technical competency, and management competency. These criteria were evaluated by 87 respondents. The analysis revealed that past performance competency held the highest weight at 38.56%, with a consistency ratio of 0.0880. It was followed by technical competency, weighted at 24.16% and a consistency ratio of 0.0794. Financial competency ranked next with a weight of 20.42% and a consistency ratio of 0.07368, while management competency had the lowest weight at 16.84%, with a consistency ratio of 0.0529. Following the identification of contractor selection criteria and the assessment of each criterion's relative importance, a case study was used to test the model validity. According to the results, the candidates were ranked based on each criterion, and the candidate with the highest overall score was declared as the winner. Selecting contractors solely based on the lowest bid is common practice but may overlook other crucial factors. Incorporating a multi-criteria technique ensures a more balanced decision that considers both the bid price and additional important criteria. The findings of this study benefit owners, stakeholders, and project managers in making well-informed decisions and guaranteeing that the contractors chosen for the projects fulfil their needs and expectations.
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    Assessment On The Factors That Cause The Delay Of 40/60 Housing Project Constructions In Addis Ababa: A Case Study of Ayat Condominium Project
    (Addis Ababa University, 2022-10) Melen Kassu; Abebe Dinku
    In search of a greater standard of living , a big population is currently moving from the rural area to the urban city. The expense of life and price of land have consequently increased significantly. As a result, the government has started constructing affordable homes for those with low and intermediate incomes.Nevertheless, despite having a contract duration of 730 calendar days, a total of 33,316 homes are still being built (AAHDC, 2021), despite an average of 5000 days having passed since the anticipated completion date. Accordingly,due to the rising rate of inflation and price increases, as well as the time that could be used to build other types of public infrastructure, this delay causes a major loss for both the government and the end users. Hence, the primary goal of this study is to identify the elements that influence the timely completion of 40/60 housing projects by taking Addis Ababa's Ayat condominium site as case study. In particular, the study examines the link between the dependent variable (time overrun) and the independent variables (such as labor skill, monitoring & control subcontractor/ speciality scarcity, communication problems payment delays and subcontractor negligence).This was studied using a control,subcontractor/speciality scarcity, communication problems, payment delays, and subcontractor negligence). This was studied using a mixed-methods approach (quantitative and qualitative), with a casual and explanatory research design. Professionals from contractors, consultants, and clients of ongoing 40/60 condominium housing developments Ayat site in Addis Ababa are the study target groups. A total of eighty (80) samples were taken from which sixty three (63) were collected. A stratified sample technique was used to choose respondents. Both descriptive and inferential statistics were used to determine the variables influencing the timely completion of the housing projects. In the case study, manpower skill, monitoring and control, subcontractor shortage, communication problems, payment delays, and subcontractor negligence were found to be statistically significant after analysing the data using SPSS.As a result, it is anticipated that the results of this study will be of great significance to the housing development program and its stakeholders, enabling them to better understand the factors that influence the timely construction of housing and to identify measures and solutions that will improve the provision of housing in the required quantity and quality. Additionally, it will help home-owners and end users decide what elements to take into account when choosing affordable housing.