A determining method of the water consultancy project quality guarantee deposit considering the contractor's credit level under the incomplete information condition

This paper studies the quality monitoring decision-making and quality guarantee deposit withhold- ing strategy of the owner in the construction supply chain composed of the owner and the contractor in the engineering construction project under different information environments. Taking the qual- ity monitoring level and quality guarantee deposit retention as the owner’s decision variables and the credit level as the contractor’s decision variables, when the owner’s quality monitoring cost and the contractor’s credit are non-concave and non-convex functions, the optimal solution of the owner’s quality monitoring decision and quality guarantee deposit retention strategy under symmetric information, asymmetric information and incomplete information are deduced by using the maximum principle. Through simulation calculation, the decision results under different information conditions are analyzed. It helps to improve the effectiveness and reliability of the owner’s quality monitoring and realize the expected quality control objectives and quality benefits.