| Abstract | This study investigates cost and time performance of highway projects from the viewpoint of the public owner. It differs from previous studies which focused on the contractor's perspective on project performance. A total of 13 success factors were identified from literature and the opinions of experienced engineers. Data from 99 projects handled by the Department of Highways (DOH) in Thailand were used to develop and test discriminant and regression models of cost and time performance. Discriminant analysis was used in this study to build the perceived cost and time predictive models, which were generated from samples of cases, which had already been grouped and known as successful and unsuccessful projects. The models were then applied to new cases with measurements for the predictor variables, to predict that the projects were either successful or unsuccessful. Meanwhile, regression analysis was also used to build cost and time performance models, which were generated by regressing 13 success factors against the indexes of cost and time performance which were referred to as the actual construction budget and duration, which varied from the plan. The results of the discriminant models show that success in cost performance depends on the management of construction resources, budget management, construction method, and communication. By contrast, schedule management and human resource management inhibit cost performance. Success in time performance depends on choice of construction method, management of construction resources, schedule management, supervision and control, and communication. Quality management, budget management., human resource management, owner involvement, and team relationships impede time performance. Accordingly, the results of the regression models show that cost performance index depend on team relationships and quality management. On the other hand, communication restrains cost performance index. Confirmation with time performance index depends on choice of construction method, human resource management, and owner involvement. Quality management and communication impedes time overrun. |