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Ziad Tamer

Bio: Ziad Tamer is an academic researcher from Purdue University. The author has contributed to research in topics: Cost centre & Construction management. The author has an hindex of 2, co-authored 2 publications receiving 35 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a risk management protocol for construction companies to handle the risks through the analysis of completed construction projects is proposed, which consists of two phases: Phase-1, risk identification and analysis at the project level, and Phase-2, development of risk-handling strategies to control risks at the company level.
Abstract: To enhance the profitability of a construction company, risks that affect the profit of the company must be controlled as part of their long-term business planning. Project risk management is a systematic process used for managing risks. However, it is challenging to properly analyze the probability and impact of risks because of the inherent uncertainties associated with construction projects. Therefore, a practical risk management protocol is proposed for construction companies to handle the risks through the analysis of completed construction projects. The protocol consists of two phases: Phase-1, risk identification and analysis at the project level, and Phase-2, development of risk-handling strategies to control risks at the company level. The major contribution of the proposed protocol is that any construction company can practically utilize the protocol to establish risk management strategies by evaluating the effectiveness of the relationships among cost centers, profit centers, and extern...

29 citations

Journal ArticleDOI
TL;DR: In this article, a protocol for profitability analysis for construction companies is presented to understand the gaps between actual and estimated profit and the origins of loss of profit on construction projects, and the construction companies can utilize the protocol t...
Abstract: Construction companies bid on projects and expect to obtain a profit by implementing awarded projects. As profit-generating entities, the construction companies are composed of cost and profit centers. The cost centers within the organization provide services required to fulfill the activities of the profit centers. The profit centers create billable work that is reimbursed by the owners of the projects. However, construction companies have had difficulty in winning new construction projects because of high competition, economic recession, and so forth. Also, many construction companies are not obtaining the profits they expect from the awarded projects. Therefore, a protocol to analyze profitability should be developed to understand the gaps between actual and estimated profit and the origins of loss of profit on construction projects. The purpose of this paper is to present a protocol for profitability analysis for the construction companies. The construction companies can utilize the protocol t...

10 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the authors highlight the risks associated with highway construction projects in the United Arab Emirates (UAE) and identify the most significant risks through a detailed literature review and a questionnaire is developed to solicit the opinion of construction professionals as to the probability and impact of those risks in addition to their proper allocation.
Abstract: Highway construction projects carry substantial risks. This paper highlights the risks associated with highway construction projects in the United Arab Emirates (UAE). Thirty-three risks are identified through detailed literature review. A questionnaire is then developed to solicit the opinion of construction professionals as to the probability and impact of those risks in addition to their proper allocation. Fifty-one surveys were completed and used in the analysis. The priority of each risk is calculated by multiplying the probability with the impact for each risk. The priority helps identify the most significant risks. The relative importance index (RII) for the risk priority is calculated based on all responses for each risk. The most significant risks include inefficient planning, unexpected ground utilities, quality and integrity of design, delays in approvals, and delays in expropriations. Internal project risks are found to be more significant than external risks. Contractors and consultan...

147 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the effects of dynamic risk interactions on a schedule delay in infrastructure projects and developed a system dynamics model for the investigation of risk effects on a project schedule based on the causal loop diagrams and the underlying relations among the variables.
Abstract: Effective risk management is critical to the success of infrastructure projects. Although several studies in the literature have focused on various aspects of infrastructure project risk management, limited efforts have investigated the overall dynamics of infrastructure project risks and how dynamic risk interactions can affect a project schedule. This study, therefore, takes a holistic view to investigate the effects of dynamic risk interactions on a schedule delay in infrastructure projects. First, major risks that can cause a schedule delay in infrastructure projects are identified through a review of related literature and questionnaire survey. Second, the interactions among main variables related to infrastructure schedule risks are analyzed using causal loop diagrams. Afterward, a system dynamics (SD) model for the investigation of risk effects on a project schedule is developed based on the causal loop diagrams and the underlying relations among the variables. Finally, the model is applied...

65 citations

Journal ArticleDOI
TL;DR: A hybrid dynamic approach for investigating the effect of risks on infrastructure project schedule performance and shows that the proposed SD-DES model could be ease of modifying the model to reflect real situation, performing various sensitivity and uncertainty analysis, and showing simulation results more effectively.

54 citations

Journal ArticleDOI
TL;DR: In this article, a questionnaires survey was conducted to get opinion of experts for their priorities on most likely risks, which occur in Arabian projects, the answers were used to make pairwise comparison between all risks parameter, then AHP is applied to normalize uncertainty estimates and rank the risk likelihood occurrence.
Abstract: Risk management is an approach of recognizing, classifying, analyzing and assessing of all risks in any project and is an important step for project success. Therefore, it is important to analyze and study parameters of construction risks. Numerous methods had developed to support project managers and contractors for risk management in construction. Applications of these methods enabled project managers to avert potential problems. “AHP” A nalytic H ierarchy P rocess was discovered by Saaty (1980), and it had been studied with “MCDM” M ultiple C riteria D ecision M aking; in this paper, AHP was used to normalize uncertainty estimates and rank risk likelihood occurrence which occurs specifically in construction projects in Egypt and Saudi Arabia during bidding and construction phases. The AHP enforcement steps had been simplified through “ECS” E xpert C hoice S oftware that is available for its fulfillment. A questionnaires survey was conducted to get opinion of experts for their priorities on most likely risks, which occur in Arabian projects, the answers were used to make pairwise comparison between all risks parameter, then AHP is applied to normalize uncertainty estimates and rank the risk likelihood occurrence. Results show project stakeholders believe that risk from financial as maximum likelihood occurrence of the construction projects. Design risk was the highest second rank most likelihood occurrence after financial risk. Political and construction risk was of the third rank.

47 citations

Journal ArticleDOI
TL;DR: In this article, the influence of a project manager's leadership competence on project performance is investigated. But little attention has been given to people-related competencies of the project manager as a leader.
Abstract: The role of a project manager’s leadership competence in improving project performance is critical. However, little attention has been given to people-related competencies of the project manager as a leader. This study aims to develop and test a model of project manager leadership competence. To investigate the influence of a project manager’s leadership competence on project performance, 289 project managers working on public sector projects in Pakistan were surveyed. Both exploratory and confirmatory factor analyses were used to analyze interrelationships among specific competencies and to explain these competencies in terms of their common underlying dimensions. Hierarchical Regression Analysis and Structural Equation Modeling were employed to test research hypotheses and the model. Findings from this study demonstrate that all five leadership competencies of a project manager are significantly related to achievement of project performance in terms of schedule, cost, and quality, as well as sta...

41 citations