Impact of Multiple Changes and Rework Orders on Construction Tradespeople Productivity in Nigeria (original) (raw)
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Causes of rework on building construction projects in Nigeria
Interim : Interdisciplinary Journal, 2013
Construction projects all over the world involve many challenges, particularly for large public projects. The emerging complex nature of construction activities has brought with it characteristic features, such as, cost increases, delay in the delivery of project, to which rework (carrying out an activity more than one time) has a high contributing factor, stemming from imperfection. This study identified the sources of rework on construction projects in Nigeria from three perspectives: the client, contractor, and consultant. The study was concentrated on the South West part of Nigeria. The quantitative research method was adopted. Random sampling technique was employed in the selection of sample size. A total of one hundred and twenty (120) questionnaires were analysed using inferential statistics. The following are the findings of this study: the contributions of the client leading to rework are in the form of poor communication, inadequate construction planning and poor managemen...
2018
Rework has become a menace in the construction industry as it leads to undesired and unnecessary loss of efforts. It degrades project cost, quality and schedule performance, and it occurs at both the design and construction phases of construction projects. This study therefore examined the perception of construction professionals on the impact of rework on the performance of both the project and the performing organisation. This was achieved by determining the most important effect of rework on project and organisational performance, and identifying variables in which the professionals view varies significantly. The study adopted a quantitative survey approach in which structured questionnaire was adopted as the research instrument. Mean item score was used in ranking the professionals perception of the effect of rework, and Kruskal-Wallis H test was used to identify the variables in which the professionals view varies. The study revealed that: rework has a very high impact of (MIS = 4.00) on project performance which results in projects over shooting their planned budget and planned duration, and degradation of project quality. Rework has a very high effect of (MIS = 4.04) on organisational performance leading to loss of profit/reduced profit, de-motivation of workers, and loss of future work/business. Disputes between contracted parties, design team dissatisfaction, de-motivation of workers and Fatigue are the factors in which the professionals’ view varied significantly. It was recommended that there is the need for the training of construction stakeholders on construction rework and other variables that cause projects to over shoot their budget, time and other resource.
IJERT-Effect of Rework on Project Performance in Building Project in Nigeria
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/effect-of-rework-on-project-performance-in-building-project-in-nigeria https://www.ijert.org/research/effect-of-rework-on-project-performance-in-building-project-in-nigeria-IJERTV4IS020266.pdf Rework occurs as a result of design, construction changes and also as variation which is addition, omission and modification of design. Rework cost is on the increase as a result of these changes and it has indirectly affected contract sum, period of completion and quality of the project. Hence this study intends to examine the causes and effects of rework in building projects. Descriptive research design was used for this study and the population consists of construction professionals from consulting and contracting organization. Simple random sampling technique method was used. A structured questionnaire was used as the principal instrument for collecting data from construction professionals in the industry. A total of 98 questionnaires were distributed and 52 were returned given an average response rate of 52%. Statistical package for social sciences (SPSS) 17 th version was used for analysis via descriptive and inferential statistic. The findings of the study indicates that changes, defect and quality deviation are the most significant sources of rework on construction projects. Poor communication with design exerts the greatest influence on the rework occurrence on construction sites. The paper also showed that there is significant relationship between rework cost and initial contract sum, initial and final contract period, with exception of final contract sum. In conclusion poor communication with design consultant, use of poor quality materials and poor workmanship are the main causes of reworks in building projects, hence this will affect the client and the project performance in terms of time, cost and quality standard. The study recommends that early identification of the causes and sources of reworks by consultants and contractors on building projects will reduce the effect of reworks cost on the contract sum, completion time and changes during the design and the construction changes either from the part of the client or the consultant.
Occurrence of Rework on Components of Building Project in Lagos State, Nigeria
International Journal of Sustainable Construction Engineering and Technology, 2017
Rework is redoing an aspect of building work as a result of poor quality, wrong implementation, changes, and errors. The purpose of this study is to assess the frequency of occurrence of rework on the component of building projects in order to identify where the stakeholders needs to be careful to prevent re –doing the aspect of work. Literatures were reviewed on the sources, occurrence and effect of rework on building project components. Descriptive research design was used for this study and the population of the study was clients’, consultants and contractors within the construction industry. Simple random sampling technique was used to select the respondents, thus each respondent has equal chance of being selected. Ninety – eight (98) questionnaires were distributed and fifty – two (52) were returned given an average response rate of 52%. Statistical package for social sciences (SPSS) 21st version was used for analysis. Frequency, percentage, Mean Item Score, Ranking and Mann-Wh...
INDEPENDENT JOURNAL OF MANAGEMENT & PRODUCTION (IJM&P), 2018
Rework is systemic and a recurring decimal, and it is triggered by several factors whose emergence create scenarios that degrades project cost, quality and schedule performance, and overall project performance. This study therefore examined the perception of construction professionals on the factors that triggers the emergence of rework in the Nigerian construction industry. This was achieved by determining the predominant rework triggers that affect project performance, identifying rework triggers in which the professionals view varies significantly, and examining the category of rework risks triggers that contribute more to rework incidences. The study adopted a quantitative survey approach in which structured questionnaire was adopted as the research instrument. Mean item score was used in ranking the professionals perception on rework triggers, and Kruskal-Wallis H test was used to identify the variables in which the professionals view varies. The study concluded that: contractor-related and design-related causes are the major categories of rework risks triggers. Unclear instruction to workers, Shortage of skilled supervisors, incomplete and inaccurate information are the predominant triggers of rework. The professionals view varies significantly on nine factors which cut across the four categories of rework triggers. It was recommended that there is need for clarity, effectiveness and timeliness of instruction and information dissemination among project participants, and the use of skilled and experienced professionals, skilled supervisors and proper implementation of quality management practices by both the design consultant and contractor throughout the project’s phases.
TOPIC: ANALYSIS OF REWORK TRIGGERS IN PUBLIC BUILDING CONSTRUCTION PROJECTS IN RIVERS STATE (043
Nigerian Institute of Quantity Surveying Research Conference 6
• Rework is a major challenge in public building construction projects and adversely affects overall construction project performance. This research analysed the rework triggers in public building construction projects in Rivers State, Nigeria. The quantitative survey approach was adopted and structured questionnaire was used for data collection. Rework triggers were categorized into design, construction errors and change in design and construction phases. Sample size was 52 respondents comprising of construction industry professionals in Rivers State. Mean score was used to rank the perception of the professionals on the rework triggers and Kendall's coefficient of concordance was employed to measure the degree of agreement of the professionals on the identified rework triggers within the categories. The study results showed 10 strong rework triggers ranked very high out of the 31 studied causing problems in public building construction projects that must be checkmated to ensure project success. The results suggest that the causative factors of rework in both design and construction stages are similar. The level of agreement among the professionals on the rework triggers related to errors in design and construction phases is low. The study recommended that a good organizational quality management system and the use of competent workforce are paramount to reducing the occurrence of rework.
Mitigating Design Change in Building Projects of Nigeria: The Professional Perspectives'
Design change is the common factor inhibiting professionals to effectively control projects cost and duration in construction which need to found a lasting solution. The study objective were to assess the effectiveness of mitigating measures against design change as inhibiting factor of cost and time control. Study uses descriptive and explorative design through survey method. Judgmental sampling used to administer 127 questionnaires to professionals in Bauchi and Gombe States, Nigeria. Data analyses using mean, frequency and spearman correlation. The hypothesis formulated revealed no significant differences among the respondents' perceptions. The major findings shows the top effective mitigating measures against design change as; Ensuring the time and cost implication of a design change is always determined and agreed before going ahead with the change whenever possible (MS=3.8451). Moreover, Study conclude that, professionals agreed and acknowledge that the developed mitigating measures against design change are all-effective and can be used in Nigerian practice. Therefore, study recommends the adaptation and implementations of the mitigating measures in practice to curtail the issues of design change in building projects.
Rework is a menace that leads to undesired and unnecessary loss of efforts, it degrades project cost and schedule performance of construction projects, both at design and construction phases. This study therefore, analyzed the impact of cost of rework on time and cost performance of building construction projects in Nigerian, using selected commercial building project within the country’s capital. A pro forma was adopted for gathering data on rework cost, project cost and time of selected building projects, while structured questionnaire was used to collect information on the likely measures for reducing rework incidences from construction professionals that were involved in the delivery of the identified projects. Regression analysis, relative importance index and Kruskal-Walis test were employed for data analysis. The study revealed a significant relationship between the cost of rework and initial and final project cost of delivering commercial buildings, as an average of 3.53% impact on the initial project cost, 46.60% contribution to cost overrun, and p-value of 0.000 was observed on all assessed projects. For the project delivery time, a significant relationship between the cost of rework and initial and final project duration, as an average of 7.35% impact on the initial delivery time, extra 19 days and p-value of 0.000 was observed on all assessed projects. Team building and education, management commitment, employee involvement, were some of the best possible measures to minimized rework problems.
ANALYSIS OF REWORK TRIGGERS IN PUBLIC BUILDING CONSTRUCTION PROJECTS IN RIVERS STATE
Nigerian Institute of Quantity Survey Recon6, 2022
Rework is a major challenge in public building construction projects and adversely affects overall construction project performance. This research analysed the rework triggers in public building construction projects in Rivers State, Nigeria. The quantitative survey approach was adopted and structured questionnaire was used for data collection. Rework triggers were categorized into design, construction errors and change in design and construction phases. Sample size was 52 respondents comprising of construction industry professionals in Rivers State. Mean score was used to rank the perception of the professionals on the rework triggers and Kendall's coefficient of concordance was employed to measure the degree of agreement of the professionals on the identified rework triggers within the categories. The study results showed 10 strong rework triggers ranked very high out of the 31 studied causing problems in public building construction projects that must be checkmated to ensure project success. The results suggest that the causative factors of rework in both design and construction stages are similar. The level of agreement among the professionals on the rework triggers related to errors in design and construction phases is low. The study recommended that a good organizational quality management system and the use of competent workforce are paramount to reducing the occurrence of rework.