Using data from twelve in-depth interviews with practising consultants, this paper presents a content-analytic study of the advantages and disadvantage of process modelling. Based on the interview data, we have two conclusions about the value of process modelling. First, that process modelling is useful, primarily for understanding and documenting business processes, but also for planning implementation projects. The major downside of process modelling is the risk of over analysis. Second, although vendor-supplied reference models may not be used much in implementation projects, process models themselves are still valuable for developing shared understandings of processes and planning software implementation projects.