Title: A GA-based fuzzy optimal model for time-cost trade-off in a project with resources consideration
Authors: Sultana Parveen; Surajit Kumar Saha
Department of Industrial and Production Engineering, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh
Titas Gas Transmission and Distribution Company Ltd., 105, Kazi Nazrul Islam Avenue, Dhaka-1215, Bangladesh
Abstract: The project managers' major concern is to complete project cost effectively and timely. But, in real life, the project completion time and cost may vary significantly as an effect of uncertainty such as weather, political and social disturbances, inflation, site congestion, human factors, productivity level, etc. Minimisation of project cost directly depends on proper utilisation of resources. Therefore, a GA-based fuzzy optimal model is proposed in this study incorporating multi-objective approach (MAWA) for project time-cost trade-off. In this study, fuzzy set theory is applied to model the managers' behaviour in predicting time and resources of activities and α-cut method in fuzzy logic theory is used as a measure of accepted risk level. In addition, the activities of project are crashed and penalty is induced for delay to make such problem realistic. The proposed model leads the managers to choose the Pareto optimal time-cost solutions under different risk levels as well as their associated degree of belief in a more flexible and realistic manner. Finally, this proposed model is used to solve a real problem.
Keywords: critical path method; CPM; fuzzy sets; fuzzy logic; genetic algorithms; GAs; fuzzy time-resources trade-off; multi-objective optimisation; time-cost trade-off problems; TCTP; project management; project cost; project completion time; resource utilisation; modelling; risk levels.
Int. J. of Industrial and Systems Engineering, 2013 Vol.15, No.2, pp.153 - 170
Available online: 14 Aug 2013