Factors Affecting Upstream Production Rate and Causing Reworks in Downstream Activities due to Activities Overlapping (original) (raw)
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CONSTRUCTION FACTORS THAT CAUSING REWORKS IN DOWNSTREAM ACTIVITIES DUE TO OVERLAPPING
IAEME Publications, 2021
Reworks due to activities overlapping have both direct and indirect effects on the performance of construction projects. To reduce the impact of reworks there is a need to understand their basic reason for their existence. This paper aims to identify the top changes that af ecting upstream production rate and causing reworks in downstream activities. These changes were identified through three stages. The first stage 23 changes were collected from a past literature review and were divided into three major categories: designer, contractor, and owner changes. 100 effective interviews were conducted and their results are employed. In the second stage, the 23 changes were then ranked from the most significant to the less significant. The third stage, the 80/20 rule applied to the changes identified to get the eight top important changes. The result shows the top important eight factors are Lack of coordination and poor communication, The contractor instruction to modify a design, Non-compliance with the specification, The owner instruction to modify a design, Incomplete design at the time of tender, Poor planning and coordination of resources, Errors made in the contract documentation and Lack of experience and knowledge of the design and construction process.
Importance Performance Analysis of Factors Causing Reworks in the Construction Industry
Civil Engineering Dimension, 2020
Rework can bring negative effect to construction project. This research aims to identify the importance level of factors causing reworks in structural, finishing, and mechanical, electrical and plumbing (MEP) works by a way of importance performance analysis (IPA). In order to reach this objective, the research evaluates the degree of occurrence the factors in each type of works and analyzes the level of difficulty in preventing the occurrence of the factors. The results are based on questionnaire survey, involving general and MEP contractors in Surabaya. Design related factors are the most frequent and most difficult to prevent in structural and finishing works. In MEP works, the most frequent factors are tight construction duration and unclear instructions from owner and designer; whilst insufficient owner’s capital is the most difficult to prevent. The research finds two factors that have high importance level, i.e. design changes and insufficient detail drawings.
In countries like India, construction industry plays a significant part to develop the economy. But many time this construction industry is blamed for poor quality, delay in completion of work and losses gain during the project period. Construction projects are divided into various stages and these stages includes various task due to this the project becomes complex in nature. Errors, omissions, defects etc are clearly going to happen when complexity is involved. These errors, omissions, and defects result in rework. Rework leads to cost and schedule overrun, material wastage, client dissatisfaction, disagreement between the contractor and client which may result in a legislative dispute. Study on rework shows that the rework cost may increase to 10% of project cost. So rework cannot be ignored in a construction project. Performance of project gets adversely affected by the added cost and tight schedule due to rework
Analysis of Disruptions Caused by Construction Field Rework on Productivity in Residential Projects
Journal of Construction Engineering and Management, 2014
Operational performance in residential construction production systems is assessed based on measures such as average house completion time, number of houses under construction, lead time and customer service. These systems, however, are prone to nonuniformity and interruptions caused by a wide range of variables such as inclement weather conditions, accidents at work sites, fluctuations in demand for houses and rework. The availability and capacity of resources therefore are not the sole measures for evaluating construction production systems capacity especially when rework is involved. The aim of this paper is to investigate the effects of rework time frame and frequency/length on tangible performance measures. Furthermore, different call-back time frames for rework and their impact on house completion time are modeled and analyzed. Volume home building was chosen as the industry sector studied in this investigation because it is a data-rich environment.
Determining the causal structure of rework influences in construction
Construction Management and Economics, 1999
One of the most perplexing issues facing organizations in the construction industry is their inability to become quality focused. As a result sub-standard products and services often emanate, which inadvertently result in rework. Typically, rework is caused by errors made during the design process. These errors appear downstream in the procurement process and therefore have a negative impact on a project' s performance. The lack of attention to quality, especially during the design process, has meant that rework has become an inevitable feature of the procurement process, and the costs have been found to be as high as 12.4% of total project costs. Such costs could be even higher because they do not represent schedule delays, litigation costs and other intangible costs of poor quality. To reduce the cost and effect of rework, an understanding of its causal structure is needed so that effective prevention strategies can be identi® ed and the effects of rework reduced or eliminated. A case study approach based upon deductive and inductive reasoning is used to identify the major factors that in¯uence rework in projects. From the ® ndings and with reference to recent literature, the concept of system dynamics is used to develop a series of in¯uence diagrams, which are then integrated to develop a conceptual causal loop model that is used to determine the overall causal structure of rework. Once an understanding of the causal structure of rework events has been acquired, effective strategies for rework prevention can be designed and implemented in order to improve project performance. This paper contributes to study of quality in construction by capturing the complexity and dynamism of those factors that in¯uence rework and project performance in a holistic manner.
IRJET- REWORK FACTORS AFFECTING COST AND SCHEDULE PERFORMANCE IN CONSTRUCTION PROJECT
IRJET, 2021
Rework is major affect a construction project. The rework affects like… delay in project, money loss. The data are collected from question survey, books and literature review. The conclusion was the research the various factors are affecting a construction project. These factors are deviled in deferent groups like... client related factors, design related factor, and government related factor are affect the construction project. After collect data than analysis the data from RII method. Some major causes are more affect the project like… design change, money problem, and poor supervision, government rule change, weather condition are bed, any type of external factors, human related factor all are major affect in overall project. Introduction:-Construction time many factors are effect in construction project. Like Money, material, tanning time and construction design and many more... it's also need as doing something a minimum of one additional time because of non-conformance to requirements. Rework may be a silent consumer of your time, resources and trust. Most important part redoing any construction activity involve factors are design and communication between designer and engineers. So if any construction Activity starts fast checks all documents and communicate with fast designer than start construction activity.
Design Changes in Construction Projects - Causes a
Isolation of design phase from construction has made the design changes inevitable in construction projects. Extensive literature appraisal has acknowledged the detrimental effect of design changes on project performances. However, the impact and causes of design changes have been divided up, either separately or project specific. As a result, the relationship between impact and causes of design changes could not be established for general construction. The primary objective of this paper is to examine the impact of design changes on project cost and identifying actions responsible for these changes. The objectives of the study were achieved through a systematic review of past literature published in well-established journals, and contents analyzed. From the extensive literature review, it was established that the design change is one of the predominant factors to cost overrun, and in some cases, may upshot into cost overrun between 5 and 40% of the project cost. Also, many causes of design changes resulting in cost overrun within the perspective of the owner, consultant, and contractors are explored. Some projects experienced closure as a result of owner induced design changes, although these changes may not be significant in number. Design changes as a result of consultants and contractors in some cases might have reduced impact but are frequent. For each consideration, most events leading to design changes can be eliminated by improving on communication and coordination between stakeholders. The main contribution of this research is to bring together the impact and causes of design changes on cost under one platform for effectively managing the design process.
Analyzing Causes for Reworks in Construction Projects in China
Although rework is a common phenomenon in the Chinese construction industry and significantly affects project success, the reasons for rework remain largely unknown and most construction companies are unable to manage the issue effectively. To investigate the causes of rework in construction projects, a total of 39 causes were first identified through a comprehensive literature review and semi-structured interviews with 13 experienced construction professionals in China. A questionnaire survey was further conducted to prioritize these causes, in which unclear project process management, poor quality of construction technology, and the use of poor construction materials rank the highest. Finally, a factor analysis revealed 11 major underlying dimensions of these causes, relating to design management, communication management, field management, project scope management, project process management, active rework, project plan changes, subcontractor management, contract management, owner capability, and the external environment. The contribution of this work lies in its examination of the underlying causes of rework perceived by construction professionals in the world's largest developing country, which is characterized by its unique economic and social systems. In particular, newly identifed causes of contract management, active rework, and scope management help expand existing knowledge of the underlying causes of rework for the global construction community.