Criteria to be used in determining project duration of road rehabilitation projects in Sri Lanka

Project duration is one of the critical features of a construction project which is determined by project planners during pre-tendering stages. Although there are several project forecasting techniques that are being practiced globally, in Sri Lanka it is the experience and practice that are used to determine the duration of a road rehabilitation project. Hence this research was aimed at developing criteria to determine the time of completion of road rehabilitation projects in Sri Lanka. Initially, a literature synthesis was carried out to identify project duration forecasting methods that are currently available and factors that can affect project durations. Subsequently, the extent of usage of those methods and factors, were determined through interviews. The main criteria were divided into four sub-criteria as relating to project scope, project complexity, project environment and management attributes. Based on the findings, ‗Unrealistic contract durations imposed by the client‘ was found to be the most critical delay factor. Project scope related criteria were the most critical factors that could affect the duration of a road rehabilitation project in Sri Lanka. Thus, it is recommended to use proper methods or criteria to determine project durations of road rehabilitation projects in Sri Lanka