Project management information systems (PMIS) are an important building block of efficient and effective project management. They have changed considerably in the last decades, starting as mere scheduling applications and now serving as complex systems covering a wide range of project processes and addressing a multitude of stakeholders. Vendors of PMIS frequently claim that these systems yield numerous benefits on the individual, workgroup and organisational level. To date, however, there is no empirical support for this claim. Also, there is still considerable uncertainty with regard to the factors influencing the success of a project management information system. This paper proposes a model for PMIS success based on the revised IS Success Model by DeLone and McLean (2003). We also suggest an accompanying survey instrument which was extensively validated using qualitative interviews, a Q-sorting/item ranking procedure and a quantitatively evaluated pre-test with 45 participants.