| dc.description.abstract | Contract negotiation may determine cost efficiency and even enhance performance to the general contractors in the construction industry. The research objective is to facilitate contract negotiation in the procurement stage using classification and regression tree (CART) in order to predict the negotiation quantity and price deduction margin. Firstly, the literature review summarizes the impact factors and proper prediction model, followed by the data collection within recent 5 years, resulting in 10,470 raw datasets of contract negotiation for construction projects. These data present the project locations mainly in the north Taiwan and 90% among them with the lump sum contract type. The data range for negotiation quantity is from 1 to 5 times and for price deduction margin is from 0% to 94%. There are 9 project categories involving falsework, earthwork, structure, wall, interior work, window, facility installation, landscape, and miscellaneous work. The prediction results on both negotiation quantity and price deduction margin are with the accuracies from 79.9% to 95.5% and from 55.6% to 86.9%, respectively. Since the results yielded form CART vary in wide ranges, the findings are interpreted further to develop negotiation strategies for general contractors in 4 aspects of high negotiation quantity with high price deduction margin, high negotiation quantity with low price deduction margin, low negotiation quantity with high price deduction margin, and low negotiation quantity with low price deduction margin. | en_US |