عنوان مقاله [English]
Delay in construction projects is a major and challenging problem occurring between owners and contractors. It may happen for different reasons and several researchers have investigated its influencing factors. Determining a projects final cost and its completion date is important for all parties involved in project execution. Using project control methods, including continuous assessment of the schedule, determining progress percentages and using the earned value method, deviations from schedule can be found. In such circumstances, conflicts might arise between contractor and owner, as restoring the original schedule of a project requires double expenditure by the contractor. Also, continuation of the previous procedure and late completion of the project will cause damage to the owner. In this research, and by using game theory, a mathematical model has been presented. Through bargaining and by a step by step approach, the behavior and strategies of the parties involved in the delayed project have been investigated. This model helps owners and contractors gain a deeper understanding of the given delay problem, obtain a fairly accurate analysis of their situation and consider possible strategies when they confront such circumstances. In a given case study, points upon which both parties can agree rationally have been proposed. With model analysis, it can be found that parameters involved in the problem can be effective in changing the range width of negotiations. In special cases, such as a disproportionate delay penalty, these parameters even make the negotiations neutral. Step by step analysis of the model showed which features can threaten negotiation, and, according to these analyses, suggestions for strategies of both sides are presented. The proposed model can help the parties reach a rational and realistic decision about the completion date of the project without wasting time. Some assumptions regarding the model have been included, which are possible for others to extend.