Subcontractor Selection using Genetic Algorithm

Polat, Gül; Kaplan, Barıs; Bingol, Befrin Neval

doi:10.1016/j.proeng.2015.10.081

Cited by 30 publications

(15 citation statements)

References 21 publications

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“…The achievement of the project performance at the end of the construction project relies on the subcontractors' performance. However, even though the actual works are performed by the subcontractor, the main contractor is still accountable to deliver the work to the owner (Polat, Kaplan & Bingol, 2015).…”

Section: Involvement Of Subcontractors In Malaysia Construction Industrymentioning

confidence: 99%

“…However, the impact is only very slight as the mean score between the two groups is very little in general. The reason why the involvement of subcontractors affected the project performance is that the main contractor only acts as the management agencies where they just control and coordinate the works of subcontractors (Polat, Kaplan & Bingol, 2015). Hence, the involvement of the subcontractor plays an importance role as they are the one to carrying out the work.…”

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Change Management in Malaysia Infrastructure Project: Role of Subcontractors

Lew

Toh

et al. 2020

IJIM

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Implementation of change management is necessary for any construction projects especially infrastructure projects where government allocated billions of ringgit for the country development and the impact of change can be minimised if attended earlier. Nowadays, subcontractors were hired by the contractor to carry out the actual work as subcontracting is a very common practice in this industry. This research was initiated to identify the possible causes of change and then investigated the current status of change management implementation in Malaysia’s infrastructure project. A questionnaire survey was designed to collect data for this research. 102 out of 130 sets of questionnaires were collected from the targeted respondents. Then, a comprehensive analysis was conducted. It was discovered that “design change”, “addition/omission of scopes” and “ambiguities and mistakes in specifications and drawings” were ranked as top three factors contributing to change in Malaysia’ infrastructure projects. This research also discovered that the implementation status of change management was surprisingly high with 72.54% of the infrastructure projects implemented change management. Lastly, the subcontractors’ involvement in contractor’s change management process affected the project performance positively was confirmed in this research as the projects with subcontractor involvement had statistically significant better project performance in terms of time, cost and quality of work. The identification of the root cause for change in infrastructure project helps the future project practitioners to avoid such situation and more well-prepared for it. Subsequently, this research discovered the benefit of practising change management within the infrastructure projects and getting the subcontractor involvement statistically. The findings of this research could improve the project performance of Malaysia’s infrastructure projects.

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Section: Involvement Of Subcontractors In Malaysia Construction Industrymentioning

confidence: 99%

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confidence: 99%

Change Management in Malaysia Infrastructure Project: Role of Subcontractors

Lew

Toh

et al. 2020

IJIM

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“…Even so, studies that combine the selection and monitoring of subcontractor are yet to be conducted. There are, however, investigations conducted focussing on the area of improvement of the subcontracting practice including selection of subcontractors (Abbasianjahromi et al , 2016; Polat, 2015; Polat et al , 2015) and monitoring of subcontractors during construction stage (Manu et al , 2015; Ng and Skitmore, 2015; Yin et al , 2014; Philips-Ryder et al , 2013). Nonetheless, studies that make the integration between these two stages of subcontracting practice as the focal point is still scarce.…”

Section: Problem Statement and Research Gapmentioning

confidence: 99%

Structural equation modelling for subcontracting practice: Malaysia chapter

Lew

Hassim

Muniandy

et al. 2018

ECAM

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Purpose Most of the previous studies conducted on the subject of subcontractors often focussed on a single phase of subcontracting practice; either on registration, selection of subcontractors or on monitoring of subcontractors without much integration to other different phases involved. Thus, on the basis of that reason, the purpose of this paper is to link the gap between different phases of subcontracting practice. This study also attempts to explore the relationships between the key criteria used by general contractors in selecting subcontractors before job awarding (CSSC) and the key criteria used for monitoring subcontractors during construction work (CMSC); which will then include an investigation of the effects these criteria have on project performance (PP). Design/methodology/approach The data obtained from a total of 162 G7 contractors in Malaysia were analysed. The interrelationships between the criteria and the effects of these criteria on PP were investigated simultaneously by employing a single model based on structural equation modelling (SEM) method. Findings The final model has discovered four major criteria that are often considered during the selection of subcontractors namely, “communication”, “relationship”, “general obligation” and “resource management” of a subcontractor. Meanwhile, the major criteria that are referred to in the monitoring of subcontractors are “workmanship”, “awareness of environment, health and safety” and “communication and relationship”. The four CSSC were found to be interrelated among themselves and affected CMSC during the construction stage. The research also revealed that the criteria used in monitoring subcontractor do affect the performance of a project. Thus, based on the result of this investigation, the monitoring of subcontractor is essential in discerning the performance level of a project. Originality/value An established SEM improves a subcontracting practice by creating platforms for CSSC, CMSC and PP to influence each other. With the gap between selection and monitoring subcontractors are filled, then the prediction of the subcontractors’ performance can be made possible.

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“…Each project is different (unique scope and specifications, effect of local conditions, changing economic conditions etc.) and there exists no standard set of criteria for the assessment of the members of the project team to assure a good choice [1,20,22]. However, the contracting authority should always take into account several basic criteria when selecting potential subcontractors to be invited to submit tenders: the quality of the work, efficiency, capacity (availability of qualified personnel and appropriate equipment), as well as the possibility of undertaking the work within a specified period of time [6,18].…”

Section: Introductionmentioning

confidence: 99%

Model of Construction Subcontractors Selection with Time Windows for their Availability

Biruk

Jaśkowski

Krzemiński

2019

Archives of Civil Engineering

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Most construction projects involve subcontracting some work packages. A subcontractor is employed on the basis of their bid as well as according to their availability. A viable schedule must account for resource availability constraints. These resources (e.g. crews, subcontractors) engage in many projects, so they become at the disposal for a new project only in certain periods. One of the key tasks of a planner is thus synchronizing the work of resources between concurrent projects. The paper presents a mathematical model of the problem of selecting subcontractors or general contractor’s crews for a time-constrained project that accounts for the availability of contractors, as well as for the cost of subcontracting works. The proposed mixed integer-binary linear programming model enables the user to perform the time/cost trade-off analysis.

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Subcontractor Selection using Genetic Algorithm

Cited by 30 publications

References 21 publications

Change Management in Malaysia Infrastructure Project: Role of Subcontractors

Change Management in Malaysia Infrastructure Project: Role of Subcontractors

Structural equation modelling for subcontracting practice: Malaysia chapter

Model of Construction Subcontractors Selection with Time Windows for their Availability

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