scispace - formally typeset
Search or ask a question
Author

Jomah Al-Najjar

Bio: Jomah Al-Najjar is an academic researcher from Islamic University of Gaza. The author has contributed to research in topics: Constructability & Cost overrun. The author has an hindex of 2, co-authored 3 publications receiving 251 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors assess factors leading to time overruns (delays) and cost overruns in construction projects in the Gaza Strip and compare the relative perceptions of contractors, consultants and owners.
Abstract: Purpose – Delays and cost overruns are evidently frequent problems in the construction industries of many developed and developing countries. The purpose of this paper is to assess factors leading to time overruns (delays) and cost overruns in construction projects in the Gaza Strip. Since there appear to be additional special contributors to delays here, the relative perceptions of contractors, consultants and owners are compared, based on a listing of causal factors derived from previous studies elsewhere, together with other factors arising from special conditions in the Gaza Strip.Design/methodology/approach – A survey of a randomly selected samples yielded responses from 66 contractors, 27 consultants, and 31 owners. The survey included 110 delay factors/causes which were grouped into 12 major groups. The same survey also included 42 cost overrun factors. The level of importance of the delays and cost overrun factors were measured and ranked by their importance indexes, according to the perspectives ...

248 citations

Journal ArticleDOI
TL;DR: In this article, the authors identify factors influencing time and cost overruns in construction projects in the Gaza Strip, and present a detailed questionnaire containing 110 factors that caused time delay and 42 factors which caused cost overrun.
Abstract: The construction industry is considered one of the most important industries in Palestine. However, most construction projects in the Gaza Strip have been exposed to time and cost overruns. The aim of this paper is to identify factors influencing time and cost overruns in construction projects in the Gaza Strip. A detailed questionnaire containing 110 factors that caused time delay and 42 factors that caused cost overruns was developed as a basis to invite inputs from contractors. 80 questionnaires were distributed to contractors and 66 were completed and returned representing an 83% response rate. The view of contractors has been analyzed to rank the causes of delay and cost overruns on an importance index. The most significant causes of time delay identified in this research are; strikes, border closures, lack of materials in markets, shortage of construction materials at site, delay of material delivery to site, cash-flow problems during construction, and poor site management. The most signific...

39 citations

01 Jan 2010
TL;DR: In this article, the authors have assessed factors influencing time and cost overruns on construction projects in India and clarified that low productivity of labour, delay in Bill settlement, lack of maintenance of the equipment, poor procurement programming of materials, strikes, riots and other external factors was the most critical factor that influence project delay.
Abstract: Construction industry is considered as one of the most important industries in India. It is well known that most construction projects exposed to time and cost overrun or both. These phenomena may affect the progress of construction industry in India as well as may expose many institutions of construction to be destroyed. Literatures of previous studies were classified into two main parts which are: (1) Factors influencing time overruns of project; (2) Factors influencing cost overrun. Most related studies were revised which included the study of these factors in many countries The aim of this study is to assess factors influencing time and cost overruns on construction projects in our country. The objectives of the study were achieved through valid questionnaire.The study clarified that “Low productivity of labour", “Delaying in Bill settlement”, “Lack of maintenance of the equipment” “Poor procurement programming of materials, Strikes, riots and other external factors was the most critical factor that influence project delay.The study illustrated that "delay in preliminary handing over the site" was one of the most important factors that may lead to cost overrun. Also it clarified that contractor's delay of material delivery and equipment has led to cost overrun. The study also clarified that prices inflation highly contributes to cost overrun.

5 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors performed an in-depth analysis of the roles and responsibilities of the key stakeholders in managing cost overruns in the Australian construction industry, and found that robust control procedures and adequate programming, along with efficient design and effective site management are the most critical factors.
Abstract: The subject of poor cost performance has been widely published in the mainstream project and construction management literature. Nevertheless, the underlying responsibilities of the key stakeholders (clients, consultants, and contractors) in managing this chronic problem in the Australian construction industry remain unclear. By performing an in-depth analysis of the roles and responsibilities of these key stakeholders, this research is intended to unfold the industrywide perception of cost performance being heavily reliant on the contractor's performance alone. Based on a thorough literature review and relevant industry inputs, 73 attributes associated with cost performance were identified for investigation. Based on the relative importance weighing technique on 48 selected attributes, planning and scheduling deficiencies have the highest impact on cost performance from clients, consultants, and contractors' perspectives. Confirmatory factor analy- sis on the combined responses across all three groups suggests that robust control procedures and adequate programming, along with efficient design and effective site management, are the most critical factors. These factors are primarily associated with the responsibilities of contractors and consultants for managing cost overruns in projects. However, the client's responsibility in facilitating effective management of these factors within the project environment is crucial. Multivariate regression analysis performed on eight factors' scores highlighted the influence offive significant factors (p < 5%) on managing cost overruns. The findings are expected to abridge a significant knowledge gap by shifting the priorities in cost estimation and management practices across all industry sectors. DOI: 10.1061/(ASCE)CO.1943-7862 .0000621. © 2013 American Society of Civil Engineers.

258 citations

Journal ArticleDOI
TL;DR: In this article, the authors conducted a study to identify the significant factors causing cost overrun in large construction projects in Malaysia and found that the top three most significant factors of cost overrun are fluctuation of prices of material, cash flow and financial difficulties faced by contractors and poor site management and supervision.
Abstract: Once a construction projects fails in achieving effective cost performance, it will result to cost overruns. These overruns are caused from several factors which are very important to uncover for improving the cost performance. In Malaysia, not many research works have been carried out on studying cost performance factors. Hence, this study was conducted to identify the significant factors causing cost overrun in large construction projects in Malaysia. Questionnaire for the survey was developed based on 35 common factors of cost overrun identified from literature work. These factors were grouped in 7 categories and validated by interviewing five experienced personnel of construction industry. The feedback of from the survey resulted in receiving 262 sets of completed valid responses against 400 questionnaires distributed amongst contractors, consultants and clients involved in large construction projects. The data from the questionnaire was analyzed statistically. Relative importance index method was used for hierarchal assessment of factors and found that the top 3 most significant factors of cost overrun are fluctuation of prices of material, cash flow and financial difficulties faced by contractors and poor site management and supervision. These factors belong to two categories i.e., contractor's site management and financial management category, thus improvements in these categories are paramount for controlling cost overrun in construction projects.

169 citations

Journal ArticleDOI
TL;DR: In this paper, a questionnaire survey of Malaysian quantity-surveying consultants was undertaken to obtain project characteristics and cost performance data, in relation to a sample of 359 recently completed construction projects.

168 citations

Journal ArticleDOI
TL;DR: In this article, the authors explored factors impeding the effectiveness of existing waste management strategies, as well as strategies for reducing waste intensiveness of the construction industry, and suggested that six factors are requisites.
Abstract: Construction industry contributes a large portion of waste to landfill, which in turns results in environmental pollution and CO2 emission. Despite the adoption of several waste management strategies, waste reduction to landfill continues seeming an insurmountable challenge. This paper explores factors impeding the effectiveness of existing waste management strategies, as well as strategies for reducing waste intensiveness of the construction industry. Drawing on series of semi structured focus group discussions with experts from the UK leading construction companies, this paper combines phenomenological approach with a critical review and analysis of extant literatures. Five broad categories of factors and practices are responsible for ineffectiveness of construction and demolition waste management strategies, which subsequently results in waste intensiveness of the industry. These include end of pipe treatment of waste, externality and incompatibility of waste management tools with design tools, atomism of waste management strategies, perceived or unexpected high cost of waste management, and culture of waste behaviour within the industry. To reduce waste intensiveness of the construction industry, the study suggests that six factors are requisites. These are tackling of waste at design stage, whole life waste consideration, compliance of waste management solutions with BIM, cheaper cost of waste management practice, increased stringency of waste management legislation and fiscal policies, and research and enlightenment. The proposed strategies are not only important for achieving low waste construction projects, they are important for reducing waste intensiveness of the construction. Implementation of the suggested measures would drive waste management practices within the construction industry.

162 citations

Journal ArticleDOI
TL;DR: In this article, the authors show that the construction industry has a major potential in the advancement of sustainable development by addressing issues related to the economic, social, and environment, and that by adopting sustainable construction, it can reduce the overall energy use and maximize potential for renewable energy supply, minimize waste, conserve water resources, enhance water quality, incorporate water sensitive design and minimize vulnerability to flooding, minimize polluting emissions to water, air and soil and minimize noise and light pollution.
Abstract: Construction industry is one of the most significant industries that contribute toward socio-economic growth especially to developing countries. The nature of the industry are fragmented, unique and complex which always face chronic problems like time overrun (70% of projects), cost overrun (average 14% of contract cost), and waste generation (approximately 10% of material cost). It is also regarded as one of the largest polluters to our environment. Traditional practices of construction process and management are found unable to control unprecedented challenges including the carbon emission issue. These challenges accent the need for practitioners to rethink and improve the construction process and technology. This shows that the construction industry has a major potential in the advancement of sustainable development by addressing issues related to the economic, social, and environment. By adopting sustainable construction, it can reduce the overall energy use and maximize potential for renewable energy supply, minimize waste, conserve water resources, enhance water quality, incorporate water sensitive design and minimize vulnerability to flooding, minimize polluting emissions to water, air and soil and minimize noise and light pollution.

153 citations