Contemporary concepts such as Business Process Re-engineering and Process Innovation emphasize the importance of process-oriented management concepts as a businesses paradigm. Large scaled multimillion-dollar implementations of Enterprise Systems explicitly and implicitly state the importance of process modelling and its contribution to the success of these projects. While there has been much research and publications on alternative process modelling techniques and tools, little attention has focused on post-hoc evaluation of actual process modelling activities or on deriving comprehensive guidelines on ‘how-to’ conduct process modelling effectively. This study aims at addressing this gap. A comprehensive a priori process modelling success model has been derived and this paper reports on the results obtained from a detailed case study at a leading Australian logistics service provider, which was conducted with the aim of testing and re-specifying the model. Keywords Success factor...